期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 1, 页码 395-403出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL066903
关键词
hemispheric albedo; HadGEM2-ES; tropical precipitation; hurricane frequency; couple climate models
资金
- IMPALA grant via Future Climates for Africa (FCFA) - NERC [NE/M017214/1]
- DFID
- Joint UK DECC/Defra Met Office Hadley Centre Climate Programme [GA01101]
- Fund for Innovative Climate and Energy Research (FICER)
- U.S. Department of Energy by Battelle Memorial Institute [DE-AC05-76RL01830]
- NERC [NE/M017265/1, NE/M017214/1] Funding Source: UKRI
- Natural Environment Research Council [NE/M017265/1, NE/M017214/1] Funding Source: researchfish
The Earth's hemispheric reflectances are equivalent to within0.2Wm(-2), even though the Northern Hemisphere contains a greater proportion of higher reflectance land areas, because of greater cloud cover in the Southern Hemisphere. This equivalence is unlikely to be by chance, but the reasons are open to debate. Here we show that equilibrating hemispheric albedos in the Hadley Centre Global Environment Model version 2-Earth System coupled climate model significantly improves what have been considered longstanding and apparently intractable model biases. Monsoon precipitation biases over all continental land areas, the penetration of monsoon rainfall across the Sahel, the West African monsoon jump, and indicators of hurricane frequency are all significantly improved. Mechanistically, equilibrating hemispheric albedos improves the atmospheric cross-equatorial energy transport and increases the supply of tropical atmospheric moisture to the Hadley cell. We conclude that an accurate representation of the cross-equatorial energy transport appears to be critical if tropical performance is to be improved.
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