| Autor: |
Brice Loose, Ann Lovely, Peter Schlosser, Christopher Zappa, Wade McGillis, Donald Perovich |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Tellus: Series B, Chemical and Physical Meteorology, Vol 68, Iss 0, Pp 1-13 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1600-0889 |
| DOI: |
10.3402/tellusb.v68.32803 |
| Popis: |
The presence of sea ice acts as a physical barrier for air–sea exchange. On the other hand it creates additional turbulence due to current shear and convection during ice formation. We present results from a laboratory study that demonstrate how shear and convection in the ice–ocean boundary layer can lead to significant gas exchange. In the absence of wind, water currents beneath the ice of 0.23 m s−1 produced a gas transfer velocity (k) of 2.8 m d−1, equivalent to k produced by a wind speed of 7 m s−1 over the open ocean. Convection caused by air–sea heat exchange also increased k of as much as 131 % compared to k produced by current shear alone. When wind and currents were combined, k increased, up to 7.6 m d−1, greater than k produced by wind or currents alone, but gas exchange forcing by wind produced mixed results in these experiments. As an aggregate, these experiments indicate that using a wind speed parametrisation to estimate k in the sea ice zone may underestimate k by ca. 50 % for wind speeds |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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