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首页> 外文期刊>Atmospheric chemistry and physics >Monitoring and assimilation tests with TROPOMI data in the CAMS system: near-real-time total column ozone
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Monitoring and assimilation tests with TROPOMI data in the CAMS system: near-real-time total column ozone

机译：在CAMS系统中使用Tropomi数据进行监控和同化测试：近实时总列臭氧

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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 offline. 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 60° N and 60° 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.
机译：2017年10月推出的Ontinel-5前体（S5P）卫星的对流层监测仪（Tropomi）产生了丰富的大气成分数据，包括近实时提供的臭氧（TCO3）的检索（NRT ）和离线。 NRT TCO3检索（V1.0.0-V1.1.2）已包含在Copernicus大气监测服务（CAM）的数据同化系统中，并进行了监控数据并对它们进行第一次同化实验的测试2017年11月26日至11月30日至11月30日。Tropomi TCO3数据在2％内同意，凸轮分析在全球范围内的大部分距离60°N和60°S之间以及来自臭氧监测仪（OMI）的TCO3检索和全球臭氧监测实验-2（GOME-2）由CAMS常规同化。然而，来自rootomi的TCO3 NRT数据在高纬度地区显示出一些检索异常，在低太阳海拔和雪/冰（例如南半球南极和雪橇和冰雪覆盖的陆地区域），在那里与凸轮分析和另一个差异数据集更大。在冬季和春季（当它们可以达到40 du）时，这些差异在NH的土地上特别明显，主要来自NRT Tropomi TCO3检索中使用的表面反照学。这种气候学具有比Tropomi TCO3数据更粗糙的水平分辨率，这导致从像素到像素的反射率变化的区域中的问题。雪/冰覆盖的像素。 Tropomi和CAM分析之间的差异也显示出一些对扫描位置的依赖性。

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