Ruprecht-Karls-Universität Heidelberg

Atmosphere and Remote Sensing

Upper Troposphere and Stratosphere Research Group

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Objectives

Our research group focuses on the investigation of physical processes of the upper troposphere and the stratosphere. A key objective is the photochemistry of ozone. Our central experimental method is the Differential Optical Absorption Spectrometry (DOAS), which allows for detecting many relevant trace gases (O3, NO2, HONO, BrO, IO, OClO, CH2O, C2H2O2, ...) as well as water in all three phases. The measurements are taken with optical grating spectrometers using either direct sunlight or scattered light at daytime and twilight. For the instrumentation different platforms are used such as aircrafts (Falcon, HALO, Geophysica), unmanned air vehicles (UAV), and high altitude balloons. The spatial and temporal reconstruction of concentration fields of the targeted trace gases is performed with assisting radiative transport calculations and inverse modelling, and least squared fits to forward modelling of the measured trace gases.

Current research topics:

Current research topics of this research group are:
  • The budget, trend and photochemistry of stratospheric bromine and iodine
  • The sources and atmospheric transport of so–called short–lived organic halogen compounds as well as the photochemistry of their inorganic decomposition products
  • The amount of bromine and iodine and their photochemistry in the troposphere
  • The characteristics of atmospheric aerosols and clouds in radiative transfer
  • Validation of satellite measurements

Current research projects:

  1. Project leader: DOAS measurement from the Global Hawk during the NASA-ATTREX project, DFG PF 384 12-1, 2013 - 2016
  2. Partner: NASA-ATTREX (Airborne tropical Tropopause Experiment), 2011 - 2015  »website«
  3. Partner: Stratospheric Change and its Role for Climate Prediction (SHARP–OFC), DFG Forschergruppe, PF384/9–1, 2009 – 2012. »website«
  4. Project leader: Atmospheric and Earth system research with the High Altitude and Long Range Research Aircraft: 1. The two–dimensional distribution of tropospheric trace gases, 2. The three–phase water distribution in clouds, 3. Trace gas profiles in the upper troposphere and lower stratosphere region, (UT/LS), DFG SPP–1294 (K. Pfeilsticker and U. Platt, PF 384/7–2). »website«
  5. Coordinator: SHIVA: Stratospheric ozone: Halogen Impacts in a Varying Atmosphere, EU- SHIVA, Grant agreement No.: 226224 (K. Pfeilsticker, IUP–Heidelberg and 12 partners), 2009 – 2012. »website«
  6. Partner: RECONCILE: Reconciliation of essential process parameters for an enhanced predictability of arctic stratospheric ozone loss and its climate interactions, EU–RECONCLE, Grant agreement no.: 226365 (FZ Jülich and 17 partners), 2009 – 2012. »website«
  7. Partner: lifetime validation of SCIAMACHY and MIPAS on board ENVISAT (ENVIVAL–LIFE), BMWi– DLR (IUP–Bremen and 4 partners), 2008 – 2012. »website«
  8. Partner: Balloon–borne Validation of ENVISAT Atmospheric Sensors, ESA–ESRIN: No. RFQ⁄3–12092/07/I–OL (FZK– Karlsruhe and 2 partners)
  9. Partner: Enriched: European collaboration for research on stratospheric chemistry and dynamics, (Nathalie Huret (LPC2E) and 14 partners), 2010 – 2012, »website«

 

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