期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 119, 期 12, 页码 8800-8817出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JC010488
关键词
Arctic halocline; Rossby deformation radius; mesoscale eddies
类别
资金
- National Science Foundation [ARC-1107623]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1107623] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1313614, 1303644, 1203643, 1107277] Funding Source: National Science Foundation
Ice-Tethered Profilers (ITP), deployed in the Arctic Ocean between 2004 and 2013, have provided detailed temperature and salinity measurements of an assortment of halocline eddies. A total of 127 mesoscale eddies have been detected, 95% of which were anticyclones, the majority of which had anomalously cold cores. These cold-core anticyclonic eddies were observed in the Beaufort Gyre region (Canadian water eddies) and the vicinity of the Transpolar Drift Stream (Eurasian water eddies). An Arctic-wide calculation of the first baroclinic Rossby deformation radius R-d has been made using ITP data coupled with climatology; R-d approximate to 13 km in the Canadian water and approximate to 8 km in the Eurasian water. The observed eddies are found to have scales comparable to R-d. Halocline eddies are in cyclogeostrophic balance and can be described by a Rankine vortex with maximum azimuthal speeds between 0.05 and 0.4 m/s. The relationship between radius and thickness for the eddies is consistent with adjustment to the ambient stratification. Eddies may be divided into four groups, each characterized by distinct core depths and core temperature and salinity properties, suggesting multiple source regions and enabling speculation of varying formation mechanisms.
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