Journal
JOURNAL OF PHYSICAL OCEANOGRAPHY
Volume 44, Issue 1, Pages 220-228Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JPO-D-13-069.1
Keywords
Circulation; Dynamics; Deep convection; Fronts; Small scale processes; Subgrid-scale processes; Atm; Ocean Structure; Phenomena; Oceanic mixed layer; Thermohaline circulation
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Funding
- NSF
- U.S. National Oceanic and Atmospheric Administration Arctic Research Office
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Deep convectionthe process by which surface waters are mixed down to 1000 m or deeperforms the primary downwelling of the meridional overturning circulation in the Northern Hemisphere. High-resolution hydrographic measurements from Seagliders indicate that during deep convectionthough water is well mixed verticallythere is substantial horizontal variation in density over short distances (tens of kilometers). This horizontal density variability present in winter (January-February) contains sufficient buoyancy to restratify the convecting region to observed levels 2.5 months later, as estimated from Argo floating platforms. These results highlight the importance of small-scale heterogeneities in the ocean that are typically poorly represented in climate models, potentially contributing to the difficulty climate models have in representing deep convection.
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