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Variability of bulk water vapor content in the marine cloudy boundary layers from microwave and near-infrared imagery

机译:微波和近红外图像海洋混浊边界层散装水蒸气含量的可变性

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摘要

This work uses the synergy of collocated microwave radiometry and near-infrared imagery to study the marine boundary layer water vapor. The Advanced Microwave Scanning Radiometer (AMSR) provides the total column water vapor, while the Moderate Resolution Imaging Spectroradiometer (MODIS) near-infrared imagery provides the water vapor above the cloud layers. The difference between the two gives the vapor between the surface and the cloud top, which may be interpreted as the boundary layer water vapor under certain conditions. As a byproduct of this algorithm, we also store cloud top information of the MODIS pixels used, a proxy for the inversion height, as well as the sea surface temperature and total column water vapor from the AMSR measurements. Hence, the AMSR-MODIS dataset provides several of the variables associated with the boundary layer thermodynamic structure. Comparisons against radiosondes and GPS radio occultation (GPSRO) data demonstrate the robustness of these boundary layer water vapor estimates. We explore the annual cycle of the number of observations as a proxy for stratus cloud amount, in well-known stratus regions; we then exploit the 16 years of AMSR-MODIS synergy to study for the first time the annual variations of the boundary layer water vapor in comparison to the sea surface temperature and the boundary layer cloud top height (equivalent to the inversion height) climatologies, and lastly we explore the climatological behavior of these variables on stratocumulus-to-cumulus transitions.
机译:这项工作采用合作微波辐射测定和近红外图像的协同作用来研究海洋边界层水蒸气。先进的微波扫描辐射计(AMSR)提供总柱水蒸气,而中等分辨率成像光谱仪(MODIS)近红外图像提供水蒸气在云层上方提供水蒸气。两者之间的差异给出了表面和云顶之间的蒸汽,这可以在某些条件下被解释为边界层水蒸气。作为该算法的副产品,我们还存储所用MODIS像素的云顶部信息,用于反转高度的代理,以及来自AMSR测量的海面温度和总柱水蒸气。因此,AMSR-MODIS数据集提供了与边界层热力结构相关的几个变量。针对无线电节和GPS无线电掩星(GPSRO)数据的比较证明了这些边界层水蒸气估计的鲁棒性。我们探讨了观察人数的年度周期,作为层间云量,众所周知的层状区域的代理;然后,我们利用16年的AMSR-MODIS协同作用于第一次学习边界层水蒸气的年度变化与海面温度和边界层云顶部高度(相当于反转高度)气候,以及最后,我们探讨这些变量对划分性积云的气候行为。

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