
Research Area A: Aerosols, clouds and chemistry
# | Title (Click to expand for MoRe information) |
---|---|
A01 | Aerosol-Cloud inTeraction and water Vapour transport in high UPdraft regimes (ACTIV-UP)
Principal investigators Tina Jurkat-Witschas (DLR) Christiane Voigt (JGU/DLR) Brief Summary Convective processes play a critical role in the Earth’s energy balance through the redistribution of heat, moisture and aerosols in the atmosphere. They are characterized by high updrafts with turbulent and diabatic processes where cloud formation and cloud properties differ from those formed in mid-latitude frontal systems. Particularly ice clouds evolving at the top of deep convective systems – so called anvil cirrus – exert a net heating at the top of the atmosphere. Locally, they can transport water vapor efficiently into the UTLS and the stratosphere e.g. in overshooting anvil tops. The representation of subgrid-scale convective cloud processes in models is yet a challenge and requires adequate parametrizations based on robust observations of cloud properties and water vapor transport pathways. The aerosol impact on cloud formation in convective systems has been the focus in many aerosol cloud interaction studies. However, disentangling the relative impact of the aerosol type and concentration and updraft velocities on the microphysical cloud properties over the lifetime of a convective cloud is one of the largest remaining questions in anthropogenic climate forcing and requires dedicated observations. Particularly the impact of aerosol concentration and updraft velocities as well as the impact of radiative and latent heating on ice particle number and ice mass concentrations in the anvil are important parameters to assess their climate impact. Spaceborne observations of aerosol and cloud particle number that provide a large dataset on liquid and cirrus cloud properties have significantly advanced in the past. However observations of small scale processes that determine the life cycle of convective systems and anvil clouds need to be validated with high resolution measurements to improve retrieval methods for global observations. Here we attempt to partially fill this gap by proposing new in-situ measurements from a dedicated aircraft campaign with the DLR-Falcon 20 to detect water vapor, aerosol and cloud properties as well as updraft velocities in convective systems in the UTLS above continental Europe and the Mediterranean Sea. In-situ measurements of water vapor, the particle size distribution (PSD), as well as chemical and microphysical properties of aerosol and clouds will be performed in central and southern Europe in autumn 2021. The following research questions will be addressed: What is the aerosol concentration in the inflow region of convection above continental Europe and the Mediterranean Sea? Is there a measurable effect of pollutants on the PSD in convective systems? How do high-updraft regimes and diabatic processes change the water vapor distribution in the UT, the turbulent H 2 O flux into the LS and the radiation budget of the UTLS? Is the water vapor distribution near convection well represented in numerical weather prediction models? How do the cloud properties in convective cirrus differ from cirrus formed in other high updraft regimes such as WCBs? How do these processes affect the UTLS radiation budget and climate? |
A02 | Radiative effects of convective ice clouds in the UTLS from satellite observations (SAT-ICE)
Principal investigators Christiane Voigt (JGU/DLR) Luca Bugliaro (DLR) Brief Summary Convection is an important atmospheric process since it controls the water and radiation budget in the UTLS in a decisive way through the transport of water and water vapor from the boundary layer. When the trapping of thermal radiation in ageing thinning anvil cirrus, the ice clouds originating from the convective outflow, outweighs the reflection of solar radiation, these UTLS clouds exert a warming effect at top of atmosphere. However, their net instantaneous radiative forcing strongly depends on cloud height, optical thickness and microphysical properties like ice crystal shape, size distribution and ice water content. Furthermore, ice cloud processes in the UTLS influence the water budget and the radiative properties of the UTLS. Finally, convection affects dynamics and thermodynamics and the transport of trace species from lower atmospheric levels to the upper troposphere. Despite their importance for weather and climate, convective cloud and anvil cirrus properties together with their temporal evolution from convective initiation to anvil dissipation still represent large uncertainties in climate and weather models. Especially in mid-latitudes only a few studies have tackled the temporal evolution of anvil clouds and their radiation effect. In this project we propose to use satellite observations to study the radiative effect of convective ice clouds in European mid-latitudes, in particular the interconnections between convective outflow macrophysical, microphysical and radiative properties. To this end, we plan to exploit geostationary Meteosat Second Generation (MSG) satellite observations of clouds with high temporal resolution since they allow to capture the life cycle of convection and to assess the envisaged ice cloud properties and their impact on radiation at top of atmosphere at different life stages. Airborne measurements of anvil clouds (project A01) will be used to investigate in situ anvil properties, cloud-radiation interactions and to validate MSG observations. Meteorological information will be gathered from numerical weather prediction models to interpret anvil observations. This exhaustive data set will be exploited to answer the following central research questions: How do the anvil cirrus properties – including microphysics – evolve with time throughout the life cycle? How does the radiative effect of convective clouds evolve with lifetime and what is the overall radiative effect of convective clouds over their life cycle? |
A03 |
Aerosol nucleation in the upper troposphere
Principal investigators Joachim Curtius (GUF) Holger Tost (JGU) Brief Summary We propose that aerosol nucleation involving Highly Oxidized Organic Molecules (HOMs) from monoterpenes and taking place in the outflow region of deep convective clouds above tropical forests is a major source of particles for the tropical troposphere. Identification of the nucleation mechanisms and the key nucleating species is the central goal of this project. Above rain forest regions we expect that monoterpenes as well as isoprene survive convective transport and are then oxidized to form extremely low-volatile organics that undergo strong nucleation in the UT. Over oceans, probably other substances dominate the nucleation process in the outflow of deep convection, especially sulfuric acid (SA) and methanesulfonic acid (MSA) from the oxidation of dimethyl sulfide (DMS). These particles, newly formed in the tropical UT, are likely the dominant source of CCN in the entire tropical troposphere as well as the major source of the stratospheric background aerosol. We plan to analyze the aircraft-based measurements of the low-volatility nucleating species measured by our CI-APi-TOF mass spectrometer during the missions CAFE-EU (2020), CAFE-BRAZIL (2021 or 2022, depending on Covid-19 situation) and CAFE-PACIFIC (2024) with the research aircraft HALO. The nucleation and early growth processes are studied at molecular level allowing the identification of the key nucleating species (role of HOMs, sulfuric acid, nitric acid, isoprene oxidation products, ammonia and their clusters for nucleation and early growth), assessment of the role of ions, low temperatures, low condensation sink, and high actinic flux as key elements for fostering the nucleation, as well as assessment of lightning-NOx for potentially reducing the formation of HOMs that are able to nucleate. Besides the precursor concentrations, a second key variable for the UTLS nucleation measurements is the quantitative detection of nucleation mode particles at low ambient pressure. We plan to develop a dual-channel ultrafine condensation particle counter (uCPC) realizing two different cut-offs around 2.5 and 7 nm, to be operated onboard the Leajet for the planned UTLS experiment (see project B01). The instrument will be developed as a 19-inch rack component that will also be suitable for other research aircraft such as HALO. The analysis will be complemented by model simulations for both the explanation of the observed mechanisms (via box modelling) using state-of-the-art aerosol nucleation and SOA schemes and the regional distributions of the aerosols (simulated with an identical aerosol scheme as in the box models) with the help of the regional chemistry climate modelling system MECO(n) and its nesting capabilities. This system is going to be applied in simulations for the CAFE campaigns. MECO(n) represents the convective uplifting either with the help of a convection parametrization and an associated tracer transport algorithm or by explicitly resolving the deep convection. For both variants an explicit scavenging / aqueous phase chemistry scheme is used, which is extended for the fate of dissolved species during freezing (i.e. retention). Hence, the complex chemical transformations in gas, aerosol and cloud phase are explicitly taken into account. |
A04 |
Sources and processes controlling aerosol composition in the UTLS - From tropical mosoon to extratropical regions
Principal investigators Franziska Köllner (JGU) Johannes Schneider (MPIC) Stephan Borrmann (MPIC/JGU) Brief Summary |
A05 |
Molecular fingerprints of organic aerosol in the UTLS region
Principal investigators Alexander Vogel (GUF) Thorsten Hoffmann (JGU)
|
A06 |
Source apportionment of UTLS refractory aerosol and ice-nucleating particles
Principal investigators Konrad Kandler (TUDa) Martin Ebert (TUDa) Joachim Curtius (GUF) Brief Summary |
A07 |
Processing of organic compounds in ice particles during deep convective transport into the UTLS
Principal investigators Miklos Szakáll (JGU) Alexander Theis (MPIC) Open positions |
Research Area B: Small scale dynamics and microphysics
# | Title (Click to expand for MoRe information) |
---|---|
B01 |
Fine scale composition gradients and mixing at the tropopause region
Principal investigators Peter Hoor (JGU) Holger Tost (JGU)
|
B02 |
Transport of aerosols and precursors from the planetary boundary layer into the UTLS - BrIdging Surface emissions, Transport and UTLS Matter (BISTUM)
Principal investigators Friederike Fachinger (MPIC) Ralf Weigel (JGU) Konrad Kandler (TUDa)
|
B03 |
Deep exchange with the UTLS: the Tibetan pipe
Principal investigators Bodo Ahrens (GUF) Juerg Schmidli (GUF) Brief Summary This project aims to improve the understanding of and quantify the role of the highest mountain ranges and plateaus in the transport of water vapor, other trace gases, and aerosols between the atmospheric boundary layer (ABL) and the UTLS. Reaching this goal will improve the understanding of the climate system and enhance the ICON-based climate modeling system that will be used and adapted in this project. Within the first phase of the CRC we will focus on ABL to UTLS exchange processes over the geographical area of the Tibetan plateau (TiP) and the Himalayas with its foothills. We plan to investigate two transport mechanisms: (a) dry deep mixing with tropopause folds and very deep ABLs (up to 5 km above the plateau level) in boreal winter and spring, and (b) deep convection over the TiP, the Himalayas, and Himalayan foothills in the monsoon season. In winter and spring, deep convective ABLs (CBLs) frequently occur over the TiP. These deep CBLs lead to a strong coupling of near-surface air with the upper troposphere (UT) and enable the rapid transport of near-surface tracers into the UT (and vice versa). The UT is then coupled on longer time scales via quasi-horizontal transport with the lower stratosphere (LS), making the TiP, not only in the monsoon season, a global hotspot of troposphere-stratosphere exchange. The Asian Mainland, including the TiP, is one of the primary source regions of deep convective transport into the UTLS, in particular in boreal summer. The project plans to investigate the unique deep convective and turbulent mixing processes over the TiP and beneath the Asian summer monsoon upper level anticyclone, which are not well represented in present day reanalyses and climate model simulations. The project studies both transport mechanisms using a multi-scale modeling approach, including tracer and trajectory methods. Realistic and idealized modeling experiments using ICON in global parameterized convection (zoomed over the Asian monsoon region to D∼13 km), in limited-area convection-permitting (Dx∼3 km), and large-eddy simulation (Dx∼200 m) setups. This multi-scale approach will improve the understanding of the lifting processes in this active transport region and will deliver transport benchmarks for coarser-grid chemistry-transport and climate models. The following CRC phases will extend the modeling-based process studies to other high mountain ranges and high plateau regions. These studies will test and extend the generated understanding and shall include explicit trace gases and aerosol in the transport modeling. Finally, we plan a climatic quantification of deep exchange in the different high and complex orography geographic regions compared to the deep exchange in other transport regions (like the storm track regions over the North Atlantic and North Pacific). |
B04 |
Structure formation and mixing in the extratropical tropopause region
Principal investigators Volkmar Wirth (JGU) Daniel Kunkel (JGU) Brief Summary |
B06 |
Impact of small-scale dynamics on UTLS transport and mixing
Principal investigators Ulrich Achatz (GUF) Juerg Schmidli (GUF) Daniel Kunkel (JGU) Open positions |
B07 |
Impact of cirrus clouds on tropopause structure
Principal investigators Peter Spichtinger (JGU) Ulrich Achatz (GUF) Brief Summary Cirrus clouds, i.e. clouds containing exclusively of ice particles, occur quite frequently in the tropopause region. They have a crucial impact on the thermodynamic structure of the UTLS region by diabatic processes, i.e. latent heating due to phase transitions and radiative effects due to absorption and emission of radiation; actually, temperature gradients and water vapor distributions are actively changed by the formation and evolution of these clouds. On the other hand, ice clouds in the cold temperature regime in the tropopause region are crucially affected by local dynamics. Gravity waves as well as dynamic and convective instabilities may have a strong impact on the life cycle of cirrus clouds, thus affecting also indirectly the tropopause region. The main goal of this project is the investigation of the interaction of dynamical processes and ice clouds in the tropopause region and their impact on the thermodynamic structure and composition of the tropopause region. Using theoretical investigations as well as numerical modeling, we will be able to develop a consistent parameterisation of these interactions and their impacts on the tropopause region for the use in coarse grid models. The following central questions are addressed in this project: − What are the dominant processes of interaction between cirrus clouds and dynamics for changing tropopause properties? − How can theory and model approaches be used for developing state-of-the-art parameterisations of tropopause ice-cloud processes in coarse resolution models? For addressing these questions we propose a two-fold approach combining theoretical investigations and numerical model simulations. We will use sophisticated mathematical methods in order to determine dominant processes and interactions between ice clouds and dynamical processes. These methods will also be used for deriving reduced order models. Complementary, we will use numerical simulations of relevant ice cloud scenarios in the tropopause region, using a hierarchy of models. Combining these two approaches we will develop prototype parameterisations, which will be implemented into the ICON model on the basis of an existing framework, developed for gravity wave parameterisations. |
B08 |
Lagrangian analysis of the role of extratropical cyclones for UTLS aerosol and humidity
Principal investigator Annette Miltenberger (JGU) Brief Summary Extratropical cyclones are linked with organised, large-scale ascent that transport water vapour, trace gases, and aerosol particles to the UTLS. While the role of warm-conveyor belts (WCBs) is undebated, a quantification of their contribution to the extratropical UTLS composition is not available. Cloud and precipitation formation strongly modify transported water vapour and aerosol content during the ascent. The importance of different processes, the impact of the uncertainties associated with their representation in numerical models are not well understood, but are likely import for investigating the impact of WCBs on future UTLS composition. The objective of this project is to develop a comprehensive understanding of the impact of WCBs on the composition of the extratropical UTLS. We will utilise high-resolution simulations and Lagrangian analysis methods to investigate the detailed moisture and aerosol budget along the ascent and to separate slantwise and embedded convective ascent. Perturbed parameter ensembles of two case studies are used to characterise the uncertainty of outflow moisture content and structure to parameter choices in the cloud microphysics. Combining these ensemble simulations with observational data from the DLR Falcon and enviscope Learjet campaigns conducted within this CRC will provide insight into the key processes controlling the transport and allow us to explore constraints on the model representations. The process-oriented, case-study based analysis will be complemented by novel high-resolution ensemble simulations, that explicitly link the individual ensemble members to their climatological significance. With this approach a climatology of WCB outflow properties and the role of convective and slantwise ascent is established from high-resolution simulations. The model climatology will be evaluated with long-term observational data from IAGOS and satellite observations. Finally, the impact of climate change on WCB moisture transport will be explored with the same approach and the results will be compared to global climate model simulations. |
Research Area C: Large scale distributions, processes and impact
# | Title (Click to expand for MoRe information) |
---|---|
C01 |
Large scale variations of water vapour and ice supersaturated regions
Principal investigators Philipp Reutter (JGU) Martina Krämer (FZJ) Christian Rolf (FZJ) Brief Summary |
C02 |
Deriving transport timescales in the UTLS from age tracers and the propagation of the seasonal cycle of CO2
Principal investigators Andreas Engel (GUF) Peter Hoor (JGU) Brief Summary |
C03 | Variability in UTLS transport from model age of air and impacts on composition
Principal investigators Felix Plöger (FZJ) Peter Hoor (JGU) Brief Summary Long-term trends in the composition of the UTLS with radiatively active trace gas species like water vapour and ozone may cause substantial effects on the Earth’s radiation budget and on surface climate and need to be correctly represented in models for reliable predictions. A robust knowledge of the variability of UTLS transport on inter-annual to decadal time scales is a prerequisite for a reliable estimation and attribution of long-term anthropogenically forced trends. However, the representation of such variability, as related to the QBO, ENSO, volcanic aerosol, SSWs, solar cycle, and ODS is often incomplete in current climate model simulations, casting comparisons with measurements into doubt. The proposed project aims at investigating variability and long-term changes of transport pathways and time scales in the UTLS from a Lagrangian model perspective. The comprehensive research strategy combines reanalysis-driven simulations with the Lagrangian CLaMS model and free-running simulations with CLaMS coupled to the climate model EMAC, together with satellite and in-situ observations. Different powerful diagnostics will be used to evaluate transport pathways and time scales in the UTLS. In addition to simulating chemical species we will use a novel age spectrum analysis method, with the age of air spectrum being the distribution of transit times through the stratosphere. The model simulations will be compared to trace gas measurements from satellite instruments (e.g., MLS, ACE-FTS, MIPAS), and to airborne in-situ tracer measurements (e.g., from recent HALO- and G5-missions) provided by the other project partners. Combination of the tracer measurement data with the full model age spectrum, and related mass fractions of young and old air masses, will allow quantifying the effect of changing transport pathways and mixing time scales on the UTLS composition. Furthermore, analysis of the tracer and mean age budgets based on the tracer continuity equation will allow further insights into the roles of different processes (e.g., residual circulation and eddy mixing) in driving transport in the UTLS. Finally, consistent EMAC climate model simulations with both Eulerian and Lagrangian CLaMS tracer transport included will be investigated for effects of Lagrangian transport with reduced numerical diffusion on the model representation of the UTLS. The research questions focus on: (i) Variability and trends in UTLS transport time scales, (ii) the related impacts on trace gas composition, and (ii) the representation of UTLS pathways and time scales in different reanalysis and models. |
C04 | Seasonality, variability and trends of halogenated trace gases in the UTLS
Principal investigator Andreas Engel (GUF) Brief Summary The project aims to investigate the seasonality of halogenated trace gases in the UTLS and to improve the understanding of the importance of different transport pathways. We suggest to use existing data from HALO missions and new observations from onboard the observation platform IAGOS-CARIBIC to investigate seasonality, variability, and long-term changes of halogenated gases with a focus on short-lived compounds (VSLS). These are expected to play a more important role in the halogen budget of the stratosphere as emissions of long-lived compounds decrease. Short-lived compounds impact mostly the lowermost stratosphere, depending on their local lifetime which varies with seasonal changes of temperature and solar radiation. IAGOS-CARIBIC is a scientific project for measurements of atmospheric composition in the UTLS from onboard a regular passenger aircraft, operated by the German airline Lufthansa. The project was paused in 2020 and will after a major refitting of the instrument package be resumed in 2022. We propose to perform regular collection of air samples followed by post-flight laboratory analysis for halogenated compounds. To do this, an existing air sampling unit needs to be modified during the first year of the CRC. Once the new CARIBIC instrumentation becomes operational, flights are expected to be performed regularly every 1–2 months. Laboratory analysis will be performed using an existing gas chromatograph/mass spectrometry set-up. As first observational data from CARIBIC flights become available, the project will focus on merging the new data-set with existing data from HALO missions. Past HALO projects from which halocarbon data are available had a strong focus on the Northern Atlantic, except for the SOUTHTRAC mission which was based in South America. CARIBIC data will add a wider longitudinal coverage with flights between Germany and the Americas or Asia and will extend seasonal coverage. To derive distributions of halogen VSLS and long-lived compounds, we propose to investigate different coordinate systems. All analyses will be performed using tropopause-centred vertical coordinates. One part of the project will investigate how the choice of the coordinates influences observed variabilities of trace gas mixing ratios. Based on the extended data base, we want to systematically compare the observed distributions with model fields and investigate the representation of the chemical and transport processes in the model. |
C05 |
Transport processes regulating the lowermost stratospheric ozone reservoir
Principal investigators Thomas Birner (LMU) Peter Hoor (JGU) Brief Summary The ozone reservoir in the lowermost stratosphere (LMS) greatly affects the potential for ozone to be transported downward into the troposphere and eventually to the surface where it has detrimental effects on human health. This project seeks to quantify transport of ozone into the LMS and thereby improve our understanding of the ozone budget of the LMS. Our central questions are: which transport processes regulate the ozone reservoir in the LMS, what is their relative strength, and how do they vary on seasonal and interannual time scales? For this purpose we will carry out a budget analysis of LMS ozone based on modern reanalyses, study the variability of individual budget terms and evaluate their contributions to events of reduced versus enhanced LMS ozone. These budget analyses will be combined with observational analyses of ozone based on data sets from different observational platforms (particularly IAGOS-CARIBIC, HALO missions, satellites) as well as transport analyses and trajectories from the ClaMS model. The observational analyses will be carried out using a coordinate framework that takes into account major transport barriers (tropopause-relative, jet core-relative) to reduce the variability induced by quasi-reversible dynamical processes. Based on the observational tracer data and interpolated reanalysis data along the flighttrack an observational based air mass budget for the LMS will be determined and appllied to observed and reanalysis ozone data. Using the combined observational and renalysis data we will further address the question of reversible versus irreversible ozone transport by intrusions into the troposphere. |
C06 |
The importance of upper troposphere aerosol transport and processing for low and mid troposphere aerosol concentrations
Principal investigators Anna Possner (GUF) Joachim Curtius (GUF) Brief Summary Several field campaigns within the tropics (Andreae et al., 2018 and references within Williamson et al., 2019) have demonstrated on a regional scale that UT NPF may contribute, or even dominate, LT CCN concentrations. Williamson et al. (2019) showed using staircase flight observations obtained during ATOM 1 and 2 that this could be the case generally throughout the tropics and sub-tropics. However a clear source-apportionment and in-depth analysis of the relevant transport time-scales and mechanisms could not be obtained in the observations or the associated numerical model experiments utilizing coupled aerosol-chemistry models of full complexity. Using the atmosphere-only version of ICON we will assess the horizontal and vertical transport of newly-formed UT particles using idealized tracer experiments. This will allow us to clearly identify regions of increased exposure to secondary UT particles. Williamson, C. J., A. Kupc, D. Axisa, K. R. Bilsback, T. Bui, P. Campuzano-Jost, M. Dollner, K. D. Froyd, A. L. Hodshire, J. L. Jimenez, J. K. Kodros, G. Luo, et al. (2019): A large source of cloud condensation nuclei from new particle formation in the tropics. Nature 574 (7778), 399–403. doi: 10.1038/s41586-019-1638-9. Andreae, M. O., A. Afchine, R. Albrecht, B. Amorim Holanda, P. Artaxo, H. M. J. Barbosa, S. Borrmann, M. A. Cecchini, A. Costa, M. Dollner, D. Fütterer, E. Järvinen, et al. (2018): Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin. Atmospheric Chemistry and Physics 18 (2), 921– doi: 10.5194/acp-18-921-2018. |
C07 |
The composition of the global UTLS nowadays and at the end of the 21st century
Principal investigators Patrick Jöckel (DLR) Holger Tost (JGU) Brief Summary In this project we will conduct and analyze computer simulations with the chemistry climate model EMAC, which participates in the AerChemMIP multi-model intercomparison project (as part of CMIP6) to investigate the evolution of the chemical composition of the UTLS on the global scale. The analysis will focus on the one hand side on the inter-hemispheric differences of the chemical composition of the UTLS and the temporal behaviour of both trace gas and aerosol concentrations as deduced from hindcast experiments in comparison with observations, and also an analysis for up to future chemistry-climate projections (following scenarios developed within the framework of CMIP6). The radiatively active compounds also play a substantial role for the climate sensitivity of chemistry climate models, which is mainly driven by the radiative forcing of the individual radiative active compounds, but also the inherent feedback processes. In this project phase we will focus on the sensitivity of the radiative forcing by process parameterizations, from which in a later stage a climate sensitivity of the model can be deduced. The current project plan will also focus on a quantification of the chemistry-climate interactions of ozone, water vapour and aerosol particles (both direct aerosol-radiation interactions and aerosol-cloud-radiation interactions) and associated feedback processes in the UTLS with implications for the whole atmosphere from the surface to the stratopause. In addition to the analysis of existing model simulations, we will conduct specific sensitivity simulations to estimate the effect of parameterized processes (in this project convection) on the UTLS chemical composition with the help of sensitivity simulations to quantify 1) the impact of the respective processes on the composition and 2) a sensitivity of the climate response via its associated radiative forcings to the representation of these processes. Therefore, it is the goal of the project to also analyse the impact of chemistry-aerosol-radiation interactions on the circulation patterns within the UTLS and resulting exchange fluxes between the troposphere and the stratosphere. A detailed analysis of the chemical composition of the UTLS, especially including aerosol particles and their chemical composition in the UTLS has hardly been undertaken so far; we also plan to include tagging to determine the origin of aerosol particles or the location of new particle formation events to estimate the role of transported versus in-situ formed aerosol particles for the aerosol budget of the UTLS and the role of chemistry-climate interactions. To evaluate the model simulations and the respective process representations we will make use of comprehensive observation data sets, e.g. from the HALO database from recent campaigns, in which substantial data in the UTLS haves been acquired, and also the (e.g. the HALO database, IAGOS/CARIBIC/ and MOZAIC and additional campaign data. This will be conducted for both, the “specified dynamics” simulation, for which a point-to-point comparison can be made, as well as repeated for the other anticipated simulations in this project, for which a more statistically based analysis will be performed. Furthermore, this project provides opportunities for several other projects within the CRC to put individual and local results into the context of global chemistry-climate simulation data. |
Z: Central projects
# | Title (Click to expand for MoRe information) |
---|---|
Z01 |
Central coordination and observational data synthesis
Principal investigator Peter Hoor (JGU) Brief Summary In this proposal we request the funds for the central coordination of CCR 301. The project serves most of all the promotion of cooperation and communication among the individual scientific projects and clusters of the CRC 301. The funds for measures to promote gender equality are managed and the training of young researchers is coordinated, in collaboration with the local graduate schools. The international visibility of CCR 301 will be fostered, e.g., via special sessions at international conferences or publication of special issues. A web page will be set up and maintained. The logistic organization and scientific planning of the extensive observational campaigns within CRC 301 will be supported by project Z01. Public outreach activities will be organized and coordinated between the different partners. To support the speaker and the deputy speaker of CRC 301 in conducting these tasks, staff for one and a half position of a scientific administrator and a secretary in Mainz and Frankfurt are applied for. |
Z02 | Data management and computing
Principal investigator Daniel Kunkel (JGU) Brief Summary This project will be responsible for implementing the data management plan for TPChange. In this context data management includes three essential parts. First, a software code repository will allow for managing code by project members and exchanging code between projects as well as publishing code. For this a git-based application hosted at the JGU will be used. Second, a data exchange server will allow for fast exchange of various data types. For this the high performance computing facility MOGONII will provide access to server capabilities which will host model and experimental data as well as data jointly used and analyzed by several sub-projects. Third, a data archive using iRODS allows for long term storage of data. In particular, this is essential for data which is used in publications and for data which is necessary to repeat experiments and data analyses. Along with technical support of the outlined infrastructure, this project will also provide continuous user support including user training throughout the first phase of the CRC. |
Z03 | Joint model development and modelling synthesis
Principal investigators Holger Tost (JGU) Ulrich Achatz (GUF) Brief Summary In this project we aim at joining and synthesizing the modelling efforts within the CRC to develop a consistent modelling system for the UTLS region based on the ICON model with the prognostic gravity-wave module MS-GWaM, utilising the MESSy interface structure. The project will involve the collaboration from all modelling projects within the CRC and is coordinated with the core development team of the MESSy system (which consists partly of PIs of the CRC). At the end of the current phase of the CRC, we will provide a chemistry-climate modelling system including aerosols with ICON as the dynamical core and with the novel parameterisations developed in the CRC, e.g. expansions of MS-GWaM to include subgrid-scale effects on tracer transport and mixing and also a flow-dependent gravity-wave source due to jets and fronts. All code will be implemented in ONE combined, comprehensive model distribution, such that for the upcoming phases of the CRC a unified modelling system can be utilised (with the option of a choice of relevant processes for the respective studies). |