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| Titel |
The impact of oceanic heat transport on the atmospheric circulation |
| VerfasserIn |
M.-A. Knietzsch, A. Schröder, V. Lucarini, F. Lunkeit |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 6, no. 2 ; Nr. 6, no. 2 (2015-09-21), S.591-615 |
| Datensatznummer |
250115479
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| Publikation (Nr.) |
 copernicus.org/esd-6-591-2015.pdf |
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| Zusammenfassung |
A general circulation model of intermediate complexity with an idealized
Earth-like aquaplanet setup is used to study the impact of changes in the
oceanic heat transport on the global atmospheric circulation. Focus is on the
atmospheric mean meridional circulation and global thermodynamic properties.
The atmosphere counterbalances to a large extent the imposed changes in the oceanic
heat transport, but, nonetheless, significant modifications to the
atmospheric general circulation are found. Increasing the strength of the
oceanic heat transport up to 2.5 PW leads to an increase in the global mean
near-surface temperature and to a decrease in its equator-to-pole gradient.
For stronger transports, the gradient is reduced further, but the global mean
remains approximately constant. This is linked to a cooling and a reversal of
the temperature gradient in the tropics.
Additionally, a stronger oceanic heat transport leads to a decline in the
intensity and a poleward shift of the maxima of both the Hadley and Ferrel
cells. Changes in zonal mean diabatic heating and friction impact the
properties of the Hadley cell, while the behavior of the Ferrel cell is
mostly controlled by friction.
The efficiency of the climate machine, the intensity of the Lorenz energy
cycle and the material entropy production of the system decline with
increased oceanic heat transport. This suggests that the climate system
becomes less efficient and turns into a state of reduced entropy production
as the enhanced oceanic transport performs a stronger large-scale mixing
between geophysical fluids with different temperatures, thus reducing the
available energy in the climate system and bringing it closer to a
state of thermal equilibrium. |
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