Intraseasonal rainfall variability in the Bay of Bengal during the Summer Monsoon: coupling with the ocean and modulation by the Indian Ocean Dipole

Jongaramrungruang, Siraput; Seo, Hyodae; Ummenhofer, Caroline C.

doi:10.1002/asl.729

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Intraseasonal rainfall variability in the Bay of Bengal during the Summer Monsoon: coupling with the ocean and modulation by the Indian Ocean Dipole

2017
By Jongaramrungruang, Siraput ; Seo, Hyodae ; Ummenhofer, Caroline C.
Source: Atmos. Sci. Lett, 18: 88-95.

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Alternative Title:

Intraseasonal rainfall variability in the Bay of Bengal during the Summer Monsoon: coupling with the ocean and modulation by the Indian Ocean Dipole
Journal Title:

Atmospheric Science Letters
Personal Author:

Jongaramrungruang, Siraput ; Seo, Hyodae ; Ummenhofer, Caroline C.

Jongaramrungruang, Siraput ; Seo, Hyodae ; Ummenhofer, Caroline C. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

The Indian Summer Monsoon rainfall exhibits pronounced intraseasonal variability in the Bay of Bengal (BoB). This study examines the intraseasonal rainfall variability with foci on the coupling with sea surface temperatures (SST) and its interannual modulation. The lagged composite analysis reveals that, in the northern BoB, SST warming leads the onset of intraseasonal rainfall by 5 days. Latent heat flux is reduced before the rain event but is greatly amplified during the rainfall maxima. Further analysis reveals that this intraseasonal rainfall-SST relationship through latent heating is strengthened in negative Indian Ocean Dipole (IOD) years when the bay-wide local SST is anomalously warm. Latent heat flux is further increased during the intraseasonal rainfall maxima leading to strengthened rainfall variability. The moisture budget analysis shows this is primarily due to stronger low-level moisture convergence in negative IOD years. The results provide important predictive information on the monsoon rainfall and its active/break cycles.
Keywords:

[+]

Atmospheric Science Back Propagation (Artificial Intelligence) Budget Dynamics El Niño Current Geochemistry & Geophysics Impact Madden-Julian Oscillation Meteorology Monsoons Ocean Surface Topography Ocean Temperature Precipitation Resolution Southern Oscillation Variation (Biology)
Source:

Atmos. Sci. Lett, 18: 88-95.
DOI:

https://doi.org/10.1002/asl.729
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4310176
Place as Subject:

Bengal, Bay of ; Indian Ocean

Bengal, Bay of ; Indian Ocean Less -
Rights Information:

CC BY
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:24c3cff9c487f1b87e3562a0616cec7a6aabc038152228a3f902015d7f00a1b3
Download URL:

https://repository.library.noaa.gov/view/noaa/26026/noaa_26026_DS1.pdf
File Type:

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