A new climate data record of upper-tropospheric humidity from microwave observations
A new climate data record of upper-tropospheric humidity from microwave observations
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DOI：
10.1038/s41597-020-0560-1
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发表时间：
2020-07
期刊：
影响因子：
9.8
通讯作者：
T. Lang;S. Buehler;M. Burgdorf;I. Hans;V. John
中科院分区：
文献类型：
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作者：
T. Lang;S. Buehler;M. Burgdorf;I. Hans;V. John
我们根据微波探测器Special Sensor Microwave Temperature-2（SSMT-2）、Advanced Microwave Sounding Unit-B（AMSU-B）和Microwave Humidity Sounder（MHS）的观测数据生成了一个新的对流层上部湿度（UTH）气候数据记录（CDR）。数据记录涵盖了1994年至2017年的时间段，并提供了月平均183.31 ± 1 GHz亮温和推导的UTH沿着以及覆盖热带地区（30 ° S至30 ° N）的1 ° × 1 °经纬度网格上的测量不确定性估计。对于UTH检索，我们引入了UTH的新定义。由于不使用湿度雅可比矩阵作为权重函数，因此在不影响反演精度的前提下，比传统定义更易于应用。同样的定义也可用于从红外观测中推导UTH，从而在未来实现红外UTH和微波UTH的协同使用。根据现有脐带缆终端接头数据记录确认新脐带缆终端接头CDR。
We generated a new Climate Data Record (CDR) of Upper Tropospheric Humidity (UTH) based on observations from the microwave sounders Special Sensor Microwave Temperature - 2 (SSMT-2), Advanced Microwave Sounding Unit - B (AMSU-B) and Microwave Humidity Sounder (MHS). The data record covers the time period between 1994 and 2017 and provides monthly mean 183.31 ± 1 GHz brightness temperatures and derived UTH along with estimates of measurement uncertainty on a 1° × 1° latitude-longitude grid covering the tropical region (30° S to 30° N). For the UTH retrieval we introduce a new definition of UTH. Forgoing the use of the humidity Jacobian as a weighting function, it is easier to apply than the traditional definition without compromising the retrieval accuracy. The same definition can be used to derive UTH from infrared observations, allowing for a more synergistic use of infrared and microwave UTH in the future. The new UTH CDR is validated against an existing UTH data record.