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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Preliminary estimation of horizontal fluxes of cloud liquid water in relation to subtropical moisture budget studies employing ISCCP, SSMI, and GEOS-1/DAS data sets
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Preliminary estimation of horizontal fluxes of cloud liquid water in relation to subtropical moisture budget studies employing ISCCP, SSMI, and GEOS-1/DAS data sets

机译：使用ISCCP，SSMI和GEOS-1 / DAS数据集与亚热带水分预算研究有关的云状液态水水平通量的初步估计

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摘要

Special Sensor Microwave/Imager (SSM/I) retrievals of cloud liquid water, International Satellite Cloud Climatology Project (ISCCP) cloud estimates, and winds from the Goddard EOS (GEOS-1/DAS) assimilation are employed to evaluate vertically integrated cloud liquid water (CLW) transport for 1992. First, GEOS-1/DAS multiyear data are used to confirm an earlier finding of a paradoxical net moisture sink over the Arabian-Iraqi desert [Alpert and Shay-El, 1993]. The negative vertically integrated moisture flux divergence over this region is balanced mainly by the negative incremental analysis updates (IAU) of moisture. Moisture fluxes reveal strong convection but without precipitation in a shallow Hadley-type cell. Vertical profiles indicate that the moisture removal process is associated with middle and high clouds and probably with CLW flux divergence. The CLW fluxes are estimated explicitly and globally from ISCCP and SSM/I by using linear regression methods. Areas of significant CLW divergence are found over the eastern coasts of both the United States and Asia, in the vicinity of the Gulf Stream and Kuroshio currents, as earlier conjectured by Peixoto [1973]. In both the Arabian-Iraqi desert and over the Sahara, divergence of a vertically integrated CLW flux opposes the convergence of a vertically integrated horizontal moisture flux, thus explaining at least partially the paradoxical net sink and source in these regions. However, the magnitude of the annual CLW flux estimates as calculated here is, in general, too small to play any significant role in the vertically integrated water budget, except perhaps along coastal regions and over dry subtropical deserts where precipitation minus evaporation is relatively small. [References: 28]
机译：利用特殊的传感器微波/成像仪（SSM / I）提取云状液态水，国际卫星云气候计划（ISCCP）云估计以及戈达德EOS（GEOS-1 / DAS）同化的风用于评估垂直整合的云状液态水（CLW）运输1992年。首先，使用GEOS-1 / DAS多年期数据来确认较早发现阿拉伯-伊拉克沙漠上自相矛盾的净水分汇[Alpert and Shay-El，1993]。在该区域上负的积分湿气通量散度主要由水分的负增量分析更新（IAU）平衡。水分通量显示出强对流性，但在浅Hadley型电池中没有沉淀。垂直剖面表明，除湿过程与中高云有关，可能与CLW通量发散有关。通过使用线性回归方法，可以从ISCCP和SSM / I显式全局地估计CLW通量。正如Peixoto [1973]早先所推测的那样，在美国和亚洲的东部沿海地区，在墨西哥湾流和黑潮海流附近都发现了明显的CLW差异区域。在阿拉伯-伊拉克沙漠和撒哈拉沙漠上空，垂直积分的CLW通量的发散与垂直积分的水平水分通量的收敛相反，因此至少部分地解释了这些地区的自相矛盾的净汇和源。但是，这里计算出的每年CLW通量估算值的大小通常太小，以至于不能在垂直整合的水预算中发挥任何重要作用，除了沿海地区和降水减去蒸发量相对较小的干燥亚热带沙漠上空。 [参考：28]

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