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Planetary Boundary Layer height over the Indian subcontinent during extreme monsoon years

Patil, MN and Patil, SD and Waghmare, RT and Dharmaraj, T (2013) Planetary Boundary Layer height over the Indian subcontinent during extreme monsoon years. Journal of Atmospheric and Solar-Terrestrial Physics, 92. pp. 94-99.

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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.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Earth surface; Extreme monsoon years; Indian summer monsoon; Low level jet; Monsoon circulations; Monsoon conditions; Monsoon season; Planetary boundary layers; Post-monsoon; Pre-monsoon; Reanalysis; Regional climate models, Climate change; Heat convection, Atmospheric thermodynamics
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 10 Jun 2014 07:14
Last Modified: 10 Jun 2014 07:14

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