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- Title
Linking airborne in-situ and column GHG measurements using an atmospheric transport model.
- Authors
Chen, Jinxuan; Gerbig, Christoph; Marshall, Julia; Boschetti, Fabio; Gałkowski, Michał; Koch, Frank-Thomas; Kiemle, Christoph; Amediek, Axel; Fix, Andreas; Totsche, Kai Uwe
- Abstract
Atmospheric greenhouse gases (GHGs) measurements are crucial in atmospheric and climateresearch, as our knowledge of GHG budgets is still somewhat limited. Research flightcampaigns can be a powerful extension to other observations when investigating specificpoint sources or regions that are not covered by existing networks. Such campaigns can makein-situ and remote sensing measurements simultaneously, but the inter-comparison of thesedata streams can pose a challenge. In the research campaign CoMet (Carbon dioxide andMethane Mission) which took place in 2018, both in situ measurements from the JenaInstrument for Greenhouse gas measurements (JIG) and remote sensing measurements fromthe Integrated Path Differential Absorption (IPDA) Lidar CHARM-F were conducted fromthe German research aircraft HALO. This study aims to link these two measurements by using the regional Lagrangiantransport model (STILT), and to establish the traceability of the measurements from thenewly developed instrument CHARM-F to WMO standards. The STILT modeluses meteorological fields from the ECMWF IFS model to derive footprints from ameasurement receptor point, defining the area whose fluxes influence the atmosphericmixing ratio signal. The model then calculates the mixing ratio of the trace gasescarbon dioxide (CO2) and methane (CH4) by multiplying the footprint with theanthropogenic emissions inventory from EDGAR and biospheric CO2 fluxes fromthe diagnostic Vegetation Photosynthesis and Respiration Model. A simple biascorrection for the STILT model based on in-situ measurements is first calculated andapplied in order to reduce its representation error. This corrected and characterizedmodel is then used to calculate vertical partial column (VPC) CO2 and CH4 mixingratios along the flight track. By comparing the modeled VPC mixing ratios to theCHARM-F observations, the consistency of the CHARM-F measurement withthe highly precise and accurate in situ measurements can be established, whiletaking into account the uncertainty of the model bridging the two data streams.
- Subjects
WORLD Meteorological Organization; ATMOSPHERIC transport; ATMOSPHERIC models; ARTIFICIAL satellite tracking; RESEARCH aircraft; EMISSION inventories; ATMOSPHERIC methane
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article