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首页> 外文期刊>Pure and Applied Geophysics >Revisiting Moisture Transport During the Indian Summer Monsoon Using the Moisture River Concept
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Revisiting Moisture Transport During the Indian Summer Monsoon Using the Moisture River Concept

机译：在印度夏季季风使用水分河概念期间重新审视水分运输

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摘要

The moisture river (MR) concept is used here to revisit the characteristics of moisture transport during the Indian Summer Monsoon (ISM) season from June to September. The study is carried out using Modern-Era Retrospective analysis for Research and Applications (MERRA) data products for the 30-year period from 1982 to 2011. MRs are detected from vertically integrated vapor transport (IVT) computed using validated MERRA mixing ratios and horizontal wind speeds at vertical levels from the surface to 300 hPa. The characteristics of MR and moisture transport associated with major rainfall episodes of the 2011 ISM are studied in detail. The large moisture content, together with high wind speeds associated with the monsoon low-level jet, contributes to the observed structure of the MR. The outflux of moisture from the Arabian Sea is on average 40% larger than the cross-equatorial flux from the southern Indian Ocean, indicating increased contribution from the Arabian Sea. The upward movement of moisture to the layers above the jet is a decisive factor in the strengthening of the river and major rainfall episodes. Back-trajectory analyses reveal that the path of moisture transport from the southern Indian Ocean is confined to the lower levels, whereas higher-level trajectories originate from the Red Sea, Arabian Sea and southern Indian Ocean. The MR statistics show significant intra-seasonal and inter-annual variability in occurrence and strength, with a near-linear relationship between the IVT strength and the corresponding daily ISM rainfall, especially over the west coast. Wavelet cross-spectral analyses carried out using the daily Arabian Sea IVT maximum and rainfall over the west coast and central India during a deficit and surplus monsoon year depict significant differences in the dominant periodicities, associated with intra-seasonal and inter-annual monsoon variations.
机译：这里使用湿度河（MR）概念来重新研究6月至9月印度夏季风（ISM）季节的水分输送特征。这项研究是使用现代研究与应用回顾性分析（MERRA）数据产品从1982年到2011年的30年间进行的。MRs是通过垂直积分水汽输送（IVT）检测到的，IVT使用经验证的MERRA混合比和从地面到300 hPa的垂直水平上的水平风速进行计算。详细研究了与2011年ISM主要降雨事件相关的MR和水分输送特征。较大的含水量，加上与季风低空急流相关的高风速，有助于观测到MR的结构。阿拉伯海的水汽外流平均比南印度洋的越赤道通量大40%，表明阿拉伯海的贡献增加。水分向上移动到喷流上方的各层是河流加强和主要降雨事件的决定性因素。后向轨迹分析表明，南印度洋的水汽输送路径仅限于较低层，而较高层的轨迹则来自红海、阿拉伯海和南印度洋。MR统计数据显示，在发生和强度方面存在显著的季节内和年际变化，IVT强度与相应的ISM日降雨量之间存在近似线性关系，尤其是在西海岸。利用阿拉伯海IVT日最大值和西海岸和印度中部季风年赤字和盈余期间的降雨量进行的小波互谱分析显示，与季节内和年际季风变化相关的主导周期存在显著差异。

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