Spatial-Temporal Variability of Droughts during Two Cropping Seasons in Sri Lanka and Its Possible Mechanisms
نویسندگان
چکیده
Drought management in Sri Lanka is mostly limited to relief provision due the shortage of scientific details develop sufficient drought risk management. Therefore, spatio-temporal variability droughts two cropping seasons, Yala (May–August) and Maha (October–March) Lanka, have been investigated using Standardized Precipitation Evapotranspiration Index (SPEI). The SPEI-4 at August (SPEI-4August) shows an apparent decadal variation over wet, intermediate, dry climate regions country, which coherent with shift rainfall 1999. For season, number events (SPEI-4August < −1) late period (2000–2015) higher than that early (1985–1999). On other hand, SPEI-6March not distinguished; however, (SPEI-6March all less after 2003 as compared period. principle component time series SPEI-4August seasons (r = 0.93) closely associated, implies received season can ascribe observed SPEI-4August. In moisture transport towards weakening 850 hPa wind circulation increasing 500 geopotential height, causes more divergence ultimately affects decreasing country. Meanwhile, especially characterized by large-scale interannual (Nino3.4) decadal-scale (Pacific Decadal Oscillation (PDO), North Atlantic (NAO).
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ژورنال
عنوان ژورنال: Asia-pacific Journal of Atmospheric Sciences
سال: 2021
ISSN: ['1976-7633', '1976-7951']
DOI: https://doi.org/10.1007/s13143-021-00239-0