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Recent lengthening of the south Asian summer monsoon season
Author(s) -
Syroka Joanna,
Toumi Ralf
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015053
Subject(s) - monsoon , climatology , walker circulation , precipitation , intertropical convergence zone , south asia , convergence zone , east asian monsoon , monsoon of south asia , indian subcontinent , circulation (fluid dynamics) , troposphere , geology , indian ocean , tropical monsoon climate , environmental science , oceanography , geography , sea surface temperature , meteorology , history , ancient history , ethnology , physics , thermodynamics
An increase in October precipitation since 1979 over the south Asian region has been observed. This increase is found to be associated with enhanced cross‐equatorial flow and strengthened cyclonic circulation over the Indian subcontinent synonymous with a northwest shift in the tropical convergence zone. We show that October lower tropospheric flow is becoming more like September circulation, indicating an increasing delay in the retreat phase of the monsoon system. This extension of the south Asian summer monsoon may be linked to enhanced land‐sea contrast.