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| Titel |
Climate responses to regional wind shifting |
| VerfasserIn |
Haijin Dai, Haijun Yang |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102765
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| Publikation (Nr.) |
 EGU/EGU2015-2164.pdf |
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| Zusammenfassung |
| By shutting down surface wind stress, MOC will become weaker. When AMOC collapses,
STC in Pacific-Indian Ocean will become stronger in the Northern Hemisphere and weaker in
the Southern Hemisphere. But when Pacific-Indian Ocean STC declines, AMOC’s strength
won’t change. Less mass transport will lead to heat transport decrease. Then Atmospheric
heat transport (AHT) increases to compensate a smaller Oceanic heat transport (OHT). Best
compensation happens when OHT is weakened by AMOC’s collapse, while the worst
compensation happens when OHT is weakened by Pacific-Indian Ocean STC’s collapse. In
the Northern Hemisphere, the compensation relation is always good in the low
latitude, bad compensation happens in the low latitude of Southern Hemisphere,
as well as high latitude of both hemispheres. The primary contribution to AHT’s
growing is stronger meridional circulation in the low latitude and more powerful
eddy transport in mid-high latitude. In the low latitude, vapour traps heat in the
tropics, which counteracts the AHT by meridional circulation. Also, in the mid-high
latitude, AHT by meridional circulation counteracts that by eddy activity. From
local feedback view, in the mid-high latitude, there is linear relation between net
flux at the top of the atmosphere and surface temperature, while the relationship is
quite complicate in the low latitude, cloud feedback is considered as a primary
factor to impact this relation. When the cloud long wave flux is not strong enough,
heat flux may escape to the outer space, which will cause a bad compensation. |
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