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The Unexpected Oceanic Peak in Energy Input to the Atmosphere and Its Consequences for Monsoon Rainfall

Authors :
Ramesh, N
Ramesh, N
Boos, WR
Ramesh, N
Ramesh, N
Boos, WR
Source :
Geophysical Research Letters; vol 49, iss 12; 0094-8276
Publication Year :
2022

Abstract

Monsoons have historically been understood to be caused by the low thermal inertia of land, allowing more energy from summer insolation to be transferred to the overlying atmosphere than over adjacent ocean. Here, we show that during boreal summer, the global maximum net energy input (NEI) to the atmosphere unexpectedly lies over the Indian Ocean, not over land. Observed radiative fluxes suggest that cloud-radiative effects (CRE) almost double the NEI over ocean, shifting the NEI peak from land to ocean. Global climate model experiments with both land and interactive sea surface temperatures confirm that CRE create the oceanic NEI maximum. Interactions between CRE, NEI, circulation, and land-sea contrast in surface heat capacity shift precipitation from Southeast to South Asia. CRE thus alter the global partitioning of precipitation between land and ocean and the spatial structure of Earth's strongest monsoon, in ways that can be understood through the NEI.

Details

Database :
OAIster
Journal :
Geophysical Research Letters; vol 49, iss 12; 0094-8276
Notes :
application/pdf, Geophysical Research Letters vol 49, iss 12 0094-8276
Publication Type :
Electronic Resource
Accession number :
edsoai.on1341879102
Document Type :
Electronic Resource