Real Data Assimilation Experiment of Tan-Tracker:Assimilating GOSAT CO2 Mole Fraction Measurements
会议名称：《第35届中国气象学会年会》
会议日期：2018年
学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学]
基 金：supported by the National High Technology Research and Development Program of China(Grant No.2013AA122002) the National Natural Science Foundation of China(41575100,91437220) the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX2-EW-QN207) the Special Fund for Meteorological Scientific Research in Public Interest(GYHY201506002)
关 键 词：Tan-Tracker GEOS-Chem GOSAT PODEn4DVar Atmospheric CO2 concentration
摘 要：This work was partially supported by the National High Technology Research and Development Program of China(Grant No. 2013 AA122002), the National Natural Science Foundation of China(41575100, 91437220), the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No. KZCX2-EW-QN207) and the Special Fund for Meteorological Scientific Research in Public Interest(GYHY201506002). The performance of a joint data assimilation system(Tan-Tracker), which is based on the PODEn4Dvar assimilation method, in assimilating Greenhouse gases Observing SATellite(GOSAT) carbon dioxide(CO)data, was evaluated. Atmospheric 3D CO concentrations and CO surface fluxes(CFs) from 2010 were simulated using a global chemistry transport model(GEOS-Chem). The Tan-Tracker system used the simulated CO concentrations and fluxes as a background field and assimilated the GOSAT column average dry-air mole fraction of CO( X) data to optimize CO concentrations and CFs in the same assimilation window. Monthly simulated X( X) and assimilated X,(X) data retrieved at different satellite scan positions were compared with GOSAT-observed X(X) data. The average RMSE between the monthly X and X data was significantly(30%) lower than the average RMSE between X and X. Specifically, reductions in error were found for the positions of northern Africa(the Sahara), the Indian peninsula, southern Africa,southern North America, and western Australia. The difference between the correlation coefficients of the X and X and those of the X and X was only small. In general, the Tan-Tracker system performed very well after assimilating the GOSAT data.