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| Titel |
A parameter model of gas exchange for the seasonal sea ice zone |
| VerfasserIn |
B. Loose, W. R. McGillis, D. Perovich, C. J. Zappa, P. Schlosser |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 1 ; Nr. 10, no. 1 (2014-01-28), S.17-28 |
| Datensatznummer |
250116920
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| Publikation (Nr.) |
 copernicus.org/os-10-17-2014.pdf |
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| Zusammenfassung |
| Carbon budgets for the polar oceans require better constraint on air–sea gas
exchange in the sea ice zone (SIZ). Here, we utilize advances in the theory
of turbulence, mixing and air–sea flux in the ice–ocean boundary layer (IOBL)
to formulate a simple model for gas exchange when the surface ocean is
partially covered by sea ice. The gas transfer velocity (k) is related to
shear-driven and convection-driven turbulence in the aqueous mass boundary
layer, and to the mean-squared wave slope at the air–sea interface. We use
the model to estimate k along the drift track of ice-tethered profilers
(ITPs) in the Arctic. Individual estimates of daily-averaged k from ITP
drifts ranged between 1.1 and 22 m d−1, and the fraction of open water
(f) ranged from 0 to 0.83. Converted to area-weighted effective transfer
velocities (keff), the minimum value of keff was
10−55 m d−1 near f = 0 with values exceeding keff
= 5 m d−1 at f = 0.4. The model indicates that effects from
shear and convection in the sea ice zone contribute an additional 40% to
the magnitude of keff, beyond what would be predicted from an
estimate of keff based solely upon a wind speed parameterization.
Although the ultimate scaling relationship for gas exchange in the sea ice
zone will require validation in laboratory and field studies, the basic
parameter model described here demonstrates that it is feasible to formulate
estimates of k based upon properties of the IOBL using data sources that
presently exist. |
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