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Water 2017, 9(4), 244; doi:10.3390/w9040244

Anomalous Features of Water Vapor Transport during Severe Summer and Early Fall Droughts in Southwest China

1
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
2
Hydrology and Water Resources Investigation Bureau of Jiangsu Province, Nanjing 210029, China
*
Author to whom correspondence should be addressed.
Academic Editors: Paulo Barbosa and Arjen Y. Hoekstra
Received: 27 November 2016 / Revised: 12 March 2017 / Accepted: 29 March 2017 / Published: 31 March 2017
(This article belongs to the Special Issue Drought Monitoring, Forecasting, and Risk Assessment)
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Abstract

Water vapor transport (WVT) is an important element in drought development. In this study, we examined the geographical and vertical anomalies of WVT during severe summer and early fall drought processes and their occurrence, persistence and recovery phases in Southwest China (SWC) by using the method of standardized anomalies (SA) and composite analysis. The SA-based indices of WVT were built up to quantify composited anomalous WVT channels objectively. Essentially, we further explored the synchronous and lagged correlations between drought processes and these channels. Key points and limitations include: (1) Two drought-related WVT channels were geographically identified with composited SA below −0.2, based on the composite of severe drought processes. The Somali channel is characterized by zonally less-than-normal African-Asian continental WVT anomalies originating from Somalia, whereas the IndoChina-Peninsula channel represents meridionally less-than-normal WVT anomalies from the IndoChina-Peninsula; (2) Both geographical and vertical WVT anomalies were intensified and concentrated at the time of drought occurrence, and then weakened and became scattered at drought recovery; (3) Most drought-related WVT anomalies were distinguishable from those of wetter events; (4) The IndoChina-Peninsula channel performs better in correlations with these drought and wetter processes than the Somali channel. Therefore, dynamic and thermodynamic anomalies need to be investigated, which are important for exploring the drought mechanism. View Full-Text
Keywords: water vapor transport; standardized anomalies; drought processes; Southwest China water vapor transport; standardized anomalies; drought processes; Southwest China
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, Z.; Lu, G.; He, H.; Wu, Z.; He, J. Anomalous Features of Water Vapor Transport during Severe Summer and Early Fall Droughts in Southwest China. Water 2017, 9, 244.

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