利用扩展的定位标准,评估 TROPOMI δD 柱检索与现场机载实地测量的结合情况

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Iris Thurnherr, Harald Sodemann, Tim Trent, Martin Werner, Hartmut Bösch
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引用次数: 0

摘要

对柱均水同位素的卫星观测是相对较新的检索产品,需要进一步进行实地评估。这种评估研究一般很难进行,因为卫星观测数据是基于卫星飞越时的瞬时像素平均值,而机载原位测量数据是基于千米范围内长达数小时的时间和空间尺度,两者之间存在很大的不匹配。此外,地形、天气条件,尤其是云量,也对卫星和机载原位测量平台之间的准确定位造成了严重制约。在此,我们提出了一种新方法,可以在更广泛的统计基础上对原位测量和卫星观测的 δD 进行比较。我们使用区域同位素模型模拟作为中间信息,以确定最佳比较区域。将我们的方法应用于2019年6月在法国安纳西进行的L-WAIVE活动的TROPOMI总柱δD检索,尽管云雾弥漫,但用于比较的卫星像素数量平均增加了20倍。此外,模拟和观测 δD 的比较显示了卫星评估对对流层中上层结构的依赖性。我们的结论是,我们的方法为δD 卫星检索的现场评估提供了更可靠的统计基础。因此,该方法将有助于规划和执行即将开展的验证和评估活动,并有可能用于其他卫星产品的评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluating TROPOMI δD Column Retrievals With In Situ Airborne Field Campaign Measurements Using Expanded Collocation Criterion

Evaluating TROPOMI δD Column Retrievals With In Situ Airborne Field Campaign Measurements Using Expanded Collocation Criterion

Satellite observations of column-averaged water isotopes are relatively new retrieval products that are in need of further in situ evaluation. Such evaluation studies are generally difficult to perform due to the wide mismatch in temporal and spatial scales between the satellite observations based on instantaneous pixel averages during an overpass and airborne in situ measurements ranging up to several hours over a km-scale. In addition, topography, weather conditions and in particular cloudiness impose severe constraints on an exact collocation between satellite and airborne in situ measurement platforms. Here we present a new method that allows a comparison between in situ measurements and satellite observations of δD on a broader statistical basis. We use regional isotope-enabled model simulations as intermediate information to identify the area for best comparisons. Applying our methodology to TROPOMI total column δD retrievals for the L-WAIVE campaign in Annecy, France, during June 2019 increases the number of satellite pixels for comparison despite widespread cloudiness on average by a factor of 20. In addition, the comparison of simulated and observed δD revealed a dependency of the satellite evaluation on the structure of the middle and upper troposphere. We conclude that our method provides a more robust statistic basis for in situ evaluation of δD satellite retrievals. The method will thus be useful in planning and executing forthcoming validation and evaluation campaigns, and can potentially be used for the evaluation of other satellite products.

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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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