DOI: 10.1016/j.gloplacha.2015.09.005
论文题名: Analysis of dry/wet conditions in the Gan River Basin, China, and their association with large-scale atmospheric circulation
作者: Zhang Y. ; You Q. ; Lin H. ; Chen C.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 133 起始页码: 309
结束页码: 317
语种: 英语
英文关键词: Dry/wet conditions
; Gan River Basin
; Large-scale atmospheric circulation
; SPEI
Scopus关键词: Balloons
; Climatology
; Drought
; Floods
; Meteorology
; Rivers
; Water management
; Water resources
; Watersheds
; Atmospheric circulation
; Atmospheric circulation patterns
; Correlation coefficient
; Gan rivers
; Geopotential height anomalies
; SPEI
; Standardized streamflow indices
; Waterresource management
; Water vapor
; atmospheric circulation
; disaster management
; drought
; evapotranspiration
; flood
; geopotential
; index method
; precipitation (climatology)
; spatiotemporal analysis
; streamflow
; temperature
; water availability
; water management
; water vapor
; Bay of Bengal
; China
; Gan Basin
; Indian Ocean
; Jiangxi
; Mongolia
; Pacific Ocean
; South China Sea
英文摘要: Droughts and floods are natural phenomena that occur when water availability is significantly below or above normal levels over a specific period. In recent years, the Gan River Basin has frequently been threatened by droughts and floods, and it is important to evaluate the characteristics of dry/wet conditions for better water resource management and disaster mitigation in this region. On the basis of precipitation and temperature data for the period 1964-2013 from 40 meteorological stations across the basin, the variability of dry/wet conditions was analyzed using the standardized precipitation evapotranspiration index (SPEI). In addition, the standardized streamflow index (SSI) and large-scale atmospheric circulation patterns calculated from NCEP/NCAR reanalysis data were used to further explore and evaluate temporal variations, spatial patterns, and possible mechanism responsible for the formation of dry/wet conditions in the basin. The results indicated that robust coefficients between monthly SSI and SPEI exist at multiple timescales. The best correlation coefficients were found at timescales of 2-3. months, which better reflect the intensity and magnitude of seasonal dry/wet conditions. Application of a 3-month SPEI for the dry (July-September) and wet (April-June) seasons indicated that severe dry/wet episodes were easy to occur in the northern part of the basin. The difference between composites of anomalous dry/wet seasons shows that both a positive height anomaly at 500. hPa and a very little water vapor flux influence the basin during the dry season of anomalous years, which can lead to the occurrence of drought events in the basin. However, during the wet season of anomalous years, geopotential height anomalies caused by areas of high pressure in the south (South China Sea) and areas of low pressure in the north (Mongolia), are responsible for the transport of copious amounts of water vapor from both the Bay of Bengal and the South China Sea. Under these conditions, the negative values of water vapor flux divergence dominate the basin and bring abundant precipitation, which often causes calamitous flood events. © 2015 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942239945&doi=10.1016%2fj.gloplacha.2015.09.005&partnerID=40&md5=e9f7f8d2e1ca54f4350c617c37f0b9ac
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11490
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Climate Dynamics Research Center and Earth System Modeling Center, International Laboratory on Climate and Environment Change, Nanjing University of Information Science and Technology (NUIST), Nanjing, China
Recommended Citation:
Zhang Y.,You Q.,Lin H.,et al. Analysis of dry/wet conditions in the Gan River Basin, China, and their association with large-scale atmospheric circulation[J]. Global and Planetary Change,2015-01-01,133.