期刊
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
卷 92, 期 -, 页码 94-99出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2012.10.011
关键词
Planetary Boundary Layer; Indian summer monsoon; Extreme monsoon years; Convection; Low level jet
Planetary Boundary Layer (PBL) plays an important role in the regional monsoon circulation by exchanging heat and moisture between the earth surface and free atmosphere. However, PBL climatology over the Indian sub-continent in the context of extreme monsoon conditions is not available for its use in the regional climate models. In this study, a large-scale seasonal feature of PBL height over the Indian sub-continent is explored with 40 years (1961-2000) ERA-40 reanalysis data. The variations in the PBL height associated with excess and deficient monsoons over India are examined. The seasonal climatology showed higher PBL height during pre-monsoon (spring) and monsoon seasons as compared to post-monsoon and winter. For the extreme monsoon situations, PBL over the north-west (NW) India has greatly reciprocated. Over the NW India, during deficient monsoon years, composite anomalies of the PBL are observed to be negative indicating large reduction in PBL. Whereas during excess monsoon years, observed positive anomalies suggest increase in the PBL. During excess (deficient) monsoon years, the convection and the LLJ are found to be stronger (weaker) associated with the higher (lower) PBL height. (C) 2012 Elsevier Ltd. All rights reserved.
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