TPEx
TPEx (TropoPause compositon gradients and small scale mixing Experiment) is the central field campaign of the TPChange research center. It was planned to take take place in summer 2023 and measurement flights were planned to be in the time window from 31 July to 18 August.
Due to unforeseen circumstances the campaign had to be postponed.
The scientific questions are
- Water vapor distribution in the UTLS region across central Europe
- Identification of mixing at and across the tropopause induced by diabatic processes
- Vertical transport of arosols and trace species from the boundary layer to the UTLS (e.g. by convection or frontal uplift) and effect of UTLS composition and new particle formation events
- Source apportionment of aerosols and ice-nucleating particles (INPs) for understanding the main pathways of transport towards UTLS
Trace species
| Project | Instrument | Species | Learjet | TOSS | Knuffi |
| C01 | FISH | H2O (water vapor) | x | ||
| C01 | WASUL | Total water, water vapor | x | ||
| B01 | UMAQS | CO, N2O | x | ||
| B01 | 2BTech ozone monitor | O3 | x | x | |
| C01 | IAGOS humidity sensor | RH, T | x | x | |
| Acceleration, pressure, position | Exact determination of coordinates for Learjet and TOSS | x | x |
Aerosol and cloud particles
| Project | Instrument | Species | Learjet | TOSS | Knuffi |
| UHSAS | Aerosol size distribution (60 nm – 2 μm) | x | x | ||
| CPC | Aerosol number concentration (2 nm and 10 nm – 3 μm) | x | |||
| FRIDGE | Ice nucleating particles | x | |||
| CARIBIC AMS with Sky OPC | mass concentrations of aerosol components sulfate, nitrate, ammonium and organics, aerosol size distribution in 31 channels from 250nm to 32 μm |
x | |||
| Backscatter cloud probe | Particle diameter and number concentration, LWC | x | x | ||
| NIXE-CAPS | size and number density of cloud particles (0.6 – 900 μm) | x | |||
| Aerosol filter samples (impactor,thermoporetic) | Offline single particle analysis | x | |||
| SOAP | organic aerosol sampling for offline chemical analysis | x |