Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico)
نویسندگان
چکیده
This work provides an assessment of the two most intense seasonal droughts that occurred over Balsas River Basin (BRB) in period 1980–2017. The detection drought events was performed using 6 month scale standardized precipitation–evapotranspiration index (SPEI-6) and precipitation (SPI-6) October. Both indices were quite similar during studied period, highlighting larger contribution deficits vs. temperature excess to occurrence basin. origin atmospheric water arriving BRB (1 May 1980–31 October 2017) investigated by a Lagrangian diagnosis method. receives moisture from Caribbean Sea rest tropical Atlantic, Gulf Mexico, eastern north Pacific three terrestrial evaporative sources: region BRB, south itself. source itself is far main source. selected for further analysis. During severe 2005, summertime sea surface (SST) soared Sea, extending eastward into large swathe North which accompanied record date hurricane activity. heating generated Rossby wave response with westward propagating anticyclonic/cyclonic gyres upper/lower troposphere. A cyclonic low-level circulation developed Mexico prevented consequent deficit precipitation. Additionally, subsidence also convection months this period. extreme event 1982, Inter Tropical Convergence Zone (ITCZ) remained southern stronger than climatological mean Pacific, producing regional Hadley circulation. descent branch cell inhibited development although sources increased their contributions; however, these bounded lower levels strong trade wind inversion.
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ژورنال
عنوان ژورنال: Atmosphere
سال: 2021
ISSN: ['2073-4433']
DOI: https://doi.org/10.3390/atmos12030368