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The ESA MIPAS/ENVISAT Level2-v8 dataset: 10 years of measurements retrieved with ORM v8.22
Atmospheric Measurement Techniques ( IF 3.8 ) Pub Date : 2021-09-16 , DOI: 10.5194/amt-2021-215
Bianca Maria Dinelli , Piera Raspollini , Marco Gai , Luca Sgheri , Marco Ridolfi , Simone Ceccherini , Flavio Barbara , Nicola Zoppetti , Elisa Castelli , Enzo Papandrea , Paolo Pettinari , Angelika Dehn , Anu Dudhia , Michael Kiefer , Alessandro Piro , Jean-Marie Flaud , Manuel Lopez-Puertas , David Moore , John Remedios , Massimo Bianchini

Abstract. The observations acquired during the full mission of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) instrument, on board the European Space Agency ENVISAT satellite, have been analysed with version 8.22 of the Optimised Retrieval Model (ORM), originally developed as the scientific prototype of the ESA level 2 processor for MIPAS observations. The results of the analyses have been included into the MIPAS level 2 version 8 (level2-v8) database containing atmospheric fields of pressure, temperature and volume mixing ratio of MIPAS main targets H2O, O3, HNO3, CH4, N2O, and NO2, along with the minor gases CFC-11, ClONO2, N2O5, CFC-12, COF2, CCl4, CF4, HCFC-22, C2H2, CH3Cl, COCl2, C2H6, OCS, HDO. The database covers all the measurements acquired by MIPAS in the nominal measurement mode of the Full Resolution (FR) part of the mission (from July 2002 to March 2004) and all the observation modes of the Optimised Resolution (OR) part (from January 2005 to April 2012). The number of species included in the MIPAS level2-v8 data-set makes it of particular importance for the studies of stratospheric chemistry. The database is considered by ESA the final release of the MIPAS level 2 products. The ORM algorithm is operated at the vertical grid coincident to the tangent altitudes of the observations or to a subset of them, spanning (in the nominal mode) the altitude range from 6 to 68 km in the FR phase and from 6 to 70 km in the OR period. In the latitude domain, FR profiles are spaced by about 4.7 degrees while the OR profiles are spaced by about 3.7 degrees. For each retrieved species the auxiliary data and the retrieval choices are described. Each product is characterised in terms of the retrieval error, spatial resolution, and 'useful' vertical range in both phases of the MIPAS mission. These depend on the characteristics of the measurements (spectral and vertical resolution of the measurements), on the retrieval choices (number of spectral points included in the analyses, number of altitudes included in the vertical retrieval grid), and on the information content of the measurements for each trace species. For temperature, water vapour, ozone and nitric acid the number of degrees of freedom is significantly larger in the OR phase than in the FR one, mainly due to the finer vertical measurement grid. In the FR phase some trace species are characterised by a smaller retrieval error with respect to the OR phase, mainly due to the larger number of spectral points used in the analyses, along with the reduced vertical resolution. The way of handling possible caveats (negative VMR, vertical grid representation) is discussed. The quality of the retrieved profiles is assessed through four criteria, two providing information on the successful convergence of the retrieval iterations, one on the capability of the retrieval to reproduce the measurements, and one on the presence of outliers. An easy way to identify and filter the problematic profiles with the information contained in the output files is provided. MIPAS level2-v8 data are available to the scientific community through the ESA portal https://earth.esa.int/eogateway/.

中文翻译:

ESA MIPAS/ENVISAT Level2-v8 数据集:使用 ORM v8.22 检索的 10 年测量结果

摘要。在欧洲航天局 ENVISAT 卫星上的迈克尔逊无源大气探测干涉仪 (MIPAS) 仪器的完整任务期间获得的观测结果已使用最初作为科学原型开发的优化检索模型 (ORM) 的 8.22 版进行了分析用于 MIPAS 观测的 ESA 2 级处理器。分析结果已纳入MIPAS 2级第8版(level2-v8)数据库,其中包含MIPAS主要目标H 2 O、O 3、HNO 3、CH 4、N的压力、温度和体积混合比的大气场2 O 和 NO 2以及少量气体 CFC-11、ClONO 2, N 2 O 5 , CFC-12, COF 2 , CCl 4 , CF 4 , HCFC-22, C 2 H 2 , CH 3 Cl, COCl 2 , C 2 H 6、OCS、HDO。该数据库涵盖了MIPAS在任务全分辨率(FR)部分的标称测量模式(2002年7月至2004年3月)和优化分辨率(OR)部分的所有观测模式(2005年1月至 2012 年 4 月)。MIPAS level2-v8 数据集中包含的物种数量使其对平流层化学研究特别重要。该数据库被 ESA 视为 MIPAS 2 级产品的最终版本。ORM 算法在与观测值的切线高度或它们的子集重合的垂直网格上运行,跨越(在标称模式下)高度范围在 FR 阶段从 6 到 68 公里,在 FR 阶段从 6 到 70 公里。或期间。在纬度域中,FR 剖面的间距约为 4。7 度,而 OR 轮廓间隔约 3.7 度。对于每个检索到的物种,描述了辅助数据和检索选择。每个产品在 MIPAS 任务的两个阶段都具有检索误差、空间分辨率和“有用”垂直范围的特征。这些取决于测量的特性(测量的光谱和垂直分辨率)、检索选择(分析中包含的光谱点数、垂直检索网格中包含的高度数)以及数据的信息内容。每个痕量物种的测量值。对于温度、水蒸气、臭氧和硝酸,OR 阶段的自由度数明显大于 FR 阶段,这主要是由于垂直测量网格更精细。在 FR 阶段,一些痕量物种的特征是相对于 OR 阶段的检索误差较小,这主要是由于分析中使用的光谱点数量较多,以及垂直分辨率降低。讨论了处理可能的警告(负 VMR、垂直网格表示)的方法。检索到的配置文件的质量通过四个标准进行评估,两个提供关于检索迭代成功收敛的信息,一个关于检索重现测量的能力,一个关于异常值的存在。提供了一种使用输出文件中包含的信息来识别和过滤有问题的配置文件的简单方法。MIPAS level2-v8 数据可通过 ESA 门户网站 https://earth.esa.int/eogateway/ 提供给科学界。
更新日期:2021-09-16
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