Observed Trends in the South Asian Monsoon Low?Pressure Systems and Rainfall Extremes Since the Late 1970s

نویسندگان

چکیده

The core Indian monsoon region receives more than half of the rainfall extremes from low-pressure systems (LPSs), which typically form over Bay Bengal and propagate upstream against time-mean low-level westerlies. Yet, relationship between trends LPSs remains uncertain. Using two tracking algorithms reanalyses-derived LPSs, we find that LPS activity extreme exhibit coherent during post-1979 satellite era. Over time, preferentially into south-central India rather north-central India, imparting a corresponding dipole footprint in extremes. Consistent with existing theories diabatic heating is instrumental shifting west-southwestward, traveling through have stronger updrafts on their west-southwestern flank those passing India. increased frequency propagating likely due to strengthened cross-equatorial moisture transport, favors storm ascents.

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ژورنال

عنوان ژورنال: Geophysical Research Letters

سال: 2021

ISSN: ['1944-8007', '0094-8276']

DOI: https://doi.org/10.1029/2021gl092378