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Spurengastransport aus dem indischen Sommermonsun

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Tomsche,  Laura
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Tomsche, L. (2018). Spurengastransport aus dem indischen Sommermonsun. PhD Thesis, Universität, Mainz.


Cite as: https://hdl.handle.net/21.11116/0000-0003-127C-E
Abstract
The Asian Monsoon Anticyclone (AMA) is a yearly recurring phenomenon in the upper troposphere, where it plays an important role in the chemical composition during the Indian summer monsoon. Therefore we investigated the transport of trace gases during the aircraft campaign OMO (Oxidation Mechanism Observations) in summer 2015. The German research aircraft HALO (High Altitude and Long Range Research Aircraft) performed flights in the upper troposphere over the Arabian Sea, the Arabian Peninsula and the Mediterranean Sea. Here we investigate the distribution of methane (CH4) and carbon monoxide (CO), measured with the IR-laser absorption spectrometer TRISTAR. For more detailed analysis we used simulations with the atmospheric-chemistry global circulation model EMAC and back trajectories from the Lagrangian particle dispersion model FLEXPART.
From background profiles we calculated a CH4-threshold to distinguish between background and AMA influence. The in situ mixing ratios for CH4 and CO increased during AMA influence by about 72.1 ppb and 20.1 ppb, respectively. EMAC simulated an increase of about 24.0 ppb (CH4) and 14.7 ppb (CO). Both trace gases are appropriate tracers to identify long range transport from the source regions in Northern India via convection and transport westwards along the southern edge of the AMA.