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TPChange TRR 301 - The Tropopause Region in a Changing Atmosphere


TPEx (TropoPause compositon gradients and small scale mixing Experiment) is the central field campaign of the TPChange research center. It was planned to 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, to early summer 2024.

 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 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
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