Role of atmospheric adjustments in the tropical Indian Ocean warming during the 20th century in climate models

Details Role of atmospheric adjustments in the tropical Indian Ocean warming during the 20th century in climate models Role of atmospheric adjustments in the tropical Indian Ocean warming during the 20th century in climate models

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3508712d&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 8, CiteID L08712

Physics

23

Global Change: Regional Climate Change, Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Global Change: Global Climate Models (3337, 4928), Global Change: Oceans (1616, 3305, 4215, 4513), Global Change: Atmosphere (0315, 0325)

Scientific paper

The tropical Indian Ocean has been warming steadily since 1950s, a trend simulated by a large ensemble of climate models. In models, changes in net surface heat flux are small and the warming is trapped in the top 125 m depth. Analysis of the model output suggests the following quasi-equilibrium adjustments among various surface heat flux components. The warming is triggered by the greenhouse gas-induced increase in downward longwave radiation, amplified by the water vapor feedback and atmospheric adjustments such as weakened winds that act to suppress turbulent heat flux from the ocean. The sea surface temperature dependency of evaporation is the major damping mechanism. The simulated changes in surface solar radiation vary considerably among models and are highly correlated with inter-model variability in SST trend, illustrating the need to reduce uncertainties in cloud simulation.

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