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《Chinese Journal of Geophysics》 2013-03
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An improvement of retrieving carbon monoxide from SCIAMACHY Part I: with respect to the instrumental issues

LIU Cheng,BAI Wen-Guang,ZHANG Xing-Ying,ZHANG Peng National Satellite Meteorological Center,China Meteorological Administration,Beijing 100081,China  
SCIAMACHY on board the European ENVISAT satellite is the only one spectrometer,which could quantitatively determine the total column densities of the greenhouse gases CO2,CH4,as well as of CO from near-infrared spectral band.Compared to other thermal infrared satellite(MOPITT,IASI,AIRS,etc.),SCIAMACHY is more sensitive to low atmosphere where the strong source are located.However,the CO retrieval turned out not only to be a challenging task from a spectroscopic point of view,but also complicated by a serious instrument issue: the ice layer deposit on the SCIAMACHY near-infrared channels.This deposit ice layer yields systematic biases on SCIAMACHY CO VCD measurements,which are up to 100% and not only depend on location,but also vary with time.The accurate correction is essential,since inaccurate corrections will lead to a wrong interpretation of the results.Currently,there are several correction methods developed by different groups,but no consistent time series could be retrieved so far.In this paper,similar correction procedures are developed and validated at first.In addition to the existing correction methods,a completely new correction method is then developed.To validate the new SCIAMACHY CO product,we compare it with the independent ground based FTIR measurements.After the correction,the agreement of the seasonal patterns greatly improves;the relative differences between the two dataset reduce from 60% to less than 5%,which make the precisely satellite measurements possible.The results not only could improve our knowledge of the sources and sinks,but most importantly,also could help government formulate carbon reduction rules,effectively reduce the greenhouse effect.
【Fund】: 国家自然科学基金项目(41105011)资助
【CateGory Index】: P414
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