TROPOMI total-column water vapor isotopologue pairs (a posteriori processing level 2b), customized subset for EUREC4A-iso

This is the TROPOMI dataset of H2O and HDO total columns customized for the EUREC4A-iso campaign (https://eurec4a.eu/overview/eurec4a-iso). It includes the H2O and HDO total-column values for an extended box around Barbados (21°N to 54°N, 110°W to 22°E) for the period 10 January to 20 February 2020. This data package contains the following level 2b variables: modified Julian date 2000, longitude, latitude, column-H2O with its retrieval error, column averaging kernel and prior profile, column-HDO with its retrieval error, column averaging kernel and prior profile, a posteriori column-δD with its retrieval error, pressure levels for the averaging kernels and a priori profiles, and a quality flag. The quality flag is 1 for clear-sky scenes, 0.5 for cloudy scenes with low clouds (with co-retrieved cloud center height up to 2km), and 0 for all other scenes. Data with a quality value of 0 should not be used. Schneider et al. (2021) describe the retrieval and provide a validation. The full TROPOMI data set is available from https://tropomi.grid.surfsara.nl/hdo/.

本数据集是为EUREC4A-iso研究计划（https://eurec4a.eu/overview/eurec4a-iso）定制的H₂O与HDO总柱浓度TROPOMI数据集。其覆盖2020年1月10日至2月20日期间，巴巴多斯周边扩展区域（北纬21°至54°，西经110°至东经22°）内的H₂O与HDO总柱浓度数值。本数据包内含以下2b级反演变量：修正儒略日2000、经度、纬度、柱浓度H₂O及其反演误差、柱平均核与先验廓线、柱浓度HDO及其反演误差、柱平均核与先验廓线、后验柱δD及其反演误差、用于计算平均核与先验廓线的气压层级，以及质量标记。其中质量标记取值为1时代表晴空场景，取值0.5时代表存在低云的多云场景（协同反演得到的云中心高度不超过2km），其余所有场景均取值为0，质量值为0的数据不得使用。Schneider等人（2021）对该反演方法进行了详细阐释并给出了验证结果。完整的TROPOMI数据集可从https://tropomi.grid.surfsara.nl/hdo/ 获取。