气候变化领域集成服务门户(CCPortal): Monitoring and assimilation tests with TROPOMI data in the CAMS system: Near-real-time total column ozone

CCPortal

DOI	10.5194/acp-19-3939-2019
	Monitoring and assimilation tests with TROPOMI data in the CAMS system: Near-real-time total column ozone
	Inness A.; Flemming J.; Heue K.-P.; Lerot C.; Loyola D.; Ribas R.; Valks P.; Van Roozendael M.; Xu J.; Zimmer W.
发表日期	2019
ISSN	16807316
起始页码	3939
结束页码	3962
卷号	19 期号:6
英文摘要	The TROPOspheric Monitoring Instrument (TROPOMI) on board the Sentinel-5 Precursor (S5P) satellite launched in October 2017 yields a wealth of atmospheric composition data, including retrievals of total column ozone (TCO3) that are provided in near-real-time (NRT) and off-line. The NRT TCO3 retrievals (v1.0.0-v1.1.2) have been included in the data assimilation system of the Copernicus Atmosphere Monitoring Service (CAMS), and tests to monitor the data and to carry out first assimilation experiments with them have been performed for the period 26 November 2017 to 30 November 2018. The TROPOMI TCO3 data agree to within 2 % with the CAMS analysis over large parts of the globe between 60ĝ N and 60ĝ S and also with TCO3 retrievals from the Ozone Monitoring Instrument (OMI) and the Global Ozone Monitoring Experiment-2 (GOME-2) that are routinely assimilated by CAMS. However, the TCO3 NRT data from TROPOMI show some retrieval anomalies at high latitudes, at low solar elevations and over snow/ice (e.g. Antarctica and snow-covered land areas in the Northern Hemisphere), where the differences with the CAMS analysis and the other data sets are larger. These differences are particularly pronounced over land in the NH during winter and spring (when they can reach up to 40 DU) and come mainly from the surface albedo climatology that is used in the NRT TROPOMI TCO3 retrieval. This climatology has a coarser horizontal resolution than the TROPOMI TCO3 data, which leads to problems in areas where there are large changes in reflectivity from pixel to pixel, e.g. pixels covered by snow/ice or not. The differences between TROPOMI and the CAMS analysis also show some dependency on scan position. The assimilation of TROPOMI TCO3 has been tested in the CAMS system for data between 60ĝ N and 60ĝ S and for solar elevations greater than 10ĝ and is found to have a small positive impact on the ozone analysis compared to Brewer TCO3 data and an improved fit to ozone sondes in the tropical troposphere and to IAGOS aircraft profiles at West African airports. The impact of the TROPOMI data is relatively small because the CAMS analysis is already well constrained by several other ozone retrievals that are routinely assimilated. When averaged over the periods February-April and September-October 2018, differences between experiments with and without assimilation of TROPOMI data are less than 2 % for TCO3 and less than 3 % in the vertical for seasonal mean zonal mean O3 mixing ratios, with the largest relative differences found in the troposphere. © Author(s) 2019.
语种	英语
scopus关键词	airport; atmospheric chemistry; chemical composition; climatology; data assimilation; mixing ratio; monitoring; ozone; real time; troposphere; West Africa
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144538
作者单位	ECMWF, Shinfield Park, Reading, RG2 9AU, United Kingdom; German Aerospace Centre (DLR), Remote Sensing Technology Institute, Oberpfaffenhofen, Wessling, 82234, Germany; BIRA-IASB, Brussels, Belgium
推荐引用方式 GB/T 7714	Inness A.,Flemming J.,Heue K.-P.,et al. Monitoring and assimilation tests with TROPOMI data in the CAMS system: Near-real-time total column ozone[J],2019,19(6).
APA	Inness A..,Flemming J..,Heue K.-P..,Lerot C..,Loyola D..,...&Zimmer W..(2019).Monitoring and assimilation tests with TROPOMI data in the CAMS system: Near-real-time total column ozone.Atmospheric Chemistry and Physics,19(6).
MLA	Inness A.,et al."Monitoring and assimilation tests with TROPOMI data in the CAMS system: Near-real-time total column ozone".Atmospheric Chemistry and Physics 19.6(2019).