Possible relation between land surface feedback and the post-landfall structure of monsoon depressions

Hsin I. Chang; Dev Niyogi; Anil Kumar; C. M. Kishtawal; Jimy Dudhia; Fei Chen; U. C. Mohanty; Marshall Shepherd

doi:10.1029/2009GL037781

Possible relation between land surface feedback and the post-landfall structure of monsoon depressions

Hsin I. Chang, Dev Niyogi, Anil Kumar, C. M. Kishtawal, Jimy Dudhia, Fei Chen, U. C. Mohanty, Marshall Shepherd

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

The effect of pre-storm land surface on the monsoon depressions (MDs) is studied. The Weather Research Forecast (WRF) model was configured with two nested domains to explore the sensitivity of MDs to antecedent soil moisture and land surface representation for selected three landfalling MDs during August 2006. Results indicate that WRF had good ability to simulate the MDs, and the post landfall model response was sensitive to antecedent soil moisture and modestly dependent on land surface representations. This was verified by reviewing the climatology of 125 MDs (1970-2003) which revealed that if the surface received heavier rainfall a week ahead of MD landfall, the inland intensity was maintained for a longer duration. The gradient in surface heat fluxes as the depression made landfall affected the evolution of the MDs over India. In particular, warmer, wetter (cooler, drier) land surface can intensify (weaken) the landfalling MDs over the Indian monsoon region.

Original language	English (US)
Article number	L15826
Journal	Geophysical Research Letters
Volume	36
Issue number	15
DOIs	https://doi.org/10.1029/2009GL037781
State	Published - Aug 16 2009
Externally published	Yes

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2009GL037781

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title = "Possible relation between land surface feedback and the post-landfall structure of monsoon depressions",

abstract = "The effect of pre-storm land surface on the monsoon depressions (MDs) is studied. The Weather Research Forecast (WRF) model was configured with two nested domains to explore the sensitivity of MDs to antecedent soil moisture and land surface representation for selected three landfalling MDs during August 2006. Results indicate that WRF had good ability to simulate the MDs, and the post landfall model response was sensitive to antecedent soil moisture and modestly dependent on land surface representations. This was verified by reviewing the climatology of 125 MDs (1970-2003) which revealed that if the surface received heavier rainfall a week ahead of MD landfall, the inland intensity was maintained for a longer duration. The gradient in surface heat fluxes as the depression made landfall affected the evolution of the MDs over India. In particular, warmer, wetter (cooler, drier) land surface can intensify (weaken) the landfalling MDs over the Indian monsoon region.",

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AU - Niyogi, Dev

AU - Kumar, Anil

AU - Kishtawal, C. M.

AU - Dudhia, Jimy

AU - Chen, Fei

AU - Mohanty, U. C.

AU - Shepherd, Marshall

PY - 2009/8/16

Y1 - 2009/8/16

N2 - The effect of pre-storm land surface on the monsoon depressions (MDs) is studied. The Weather Research Forecast (WRF) model was configured with two nested domains to explore the sensitivity of MDs to antecedent soil moisture and land surface representation for selected three landfalling MDs during August 2006. Results indicate that WRF had good ability to simulate the MDs, and the post landfall model response was sensitive to antecedent soil moisture and modestly dependent on land surface representations. This was verified by reviewing the climatology of 125 MDs (1970-2003) which revealed that if the surface received heavier rainfall a week ahead of MD landfall, the inland intensity was maintained for a longer duration. The gradient in surface heat fluxes as the depression made landfall affected the evolution of the MDs over India. In particular, warmer, wetter (cooler, drier) land surface can intensify (weaken) the landfalling MDs over the Indian monsoon region.

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Possible relation between land surface feedback and the post-landfall structure of monsoon depressions

Abstract

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