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The Ability of GeoCarb to Constrain the Interannual Variability of Carbon Gases over the AmazonWe perform a number of idealized assimilation experiments with the GEOS constituent data assimilation system to test the ability of GeoCarb retrievals of CO, CO2, and CH4 to constrain the interannual variability of these gases over the Amazon. Retrievals for instruments on other satellites which observe in similar channels (e.g. MOPITT, GOSAT, and OCO-2) are limited due to persistent cloud coverage. Given its ability to sample the same location multiple times in one day, the expectation is that GeoCarb retrievals will return more soundings than those from previous missions. The goal of the assimilation experiments is to understand which scanning strategies lead to the best sounding densities and thus have the best chance of constraining interannual variability in the carbon species. The experiments each begin by picking a given year at random from a nature run (i.e., a model simulation meant to represent the truth). The model fields are sampled according to a given strategy and then screened to account for cloud coverage. Next, we pick another year at random and assimilate the synthetic GeoCarb samples into the GEOS model for that year. The output of the assimilation, 6-hourly, 3D fields of each constituent, is then directly comparable to the nature run. This comparison allows us to evaluate the ability of GeoCarb measurements to constrain the interannual variability of each gas.
Document ID
20190026733
Document Type
Poster
Authors
Weir, B.
(Universities Space Research Association (USRA) Greenbelt, MD, United States)
Crowell, S.
(University of Oklahoma Norman, OK, United States)
Kawa, S. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ott, L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chatterjee, A.
(Universities Space Research Association (USRA) Greenbelt, MD, United States)
Pawson, S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moore, B.
(University of Oklahoma Norman, OK, United States)
Date Acquired
June 27, 2019
Publication Date
June 3, 2019
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN70197
Meeting Information
International Workshop on Greenhouse Gas Measurements from Space (IWGGMS-15)(Sapporo)
Funding Number(s)
CONTRACT_GRANT: NNG11HP16A
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.

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