Upper-Ocean Processes under the Stratus Cloud Deck in the Southeast Pacific Ocean
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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The annual mean heat budget of the upper ocean beneath the stratocumulusstratus cloud deck in the southeast Pacific is estimated using Simple Ocean Data Assimilation SODA and an eddy-resolving Hybrid Coordinate Ocean Model HYCOM. Both are compared with estimates based on Woods Hole Oceanographic Institution WHOI Improved Meteorological IMET buoy observations at 208S, 858W. Net surface heat fluxes are positive warming over most of the area under the stratus cloud deck. Upper-ocean processes responsible for balancing the surface heat flux are examined by estimating each term in the heat equation. In contrast to surface heat fluxes, geostrophic transport in the upper 50 meters causes net cooling in most of the stratus cloud deck region. Ekman transport provides net warming north of the IMET site and net cooling south of the IMET site. Although the eddy heat flux divergence term can be comparable to other terms at a particular location, such as the IMET mooring site, it is negligible for the entire stratus region when area averaged because it is not spatially coherent in the open ocean. Although cold-core eddies are often generated near the coast in the eddy-resolving model, they do not significantly impact the heat budget in the open ocean in the southeast Pacific.
- Atmospheric Physics
- Physical and Dynamic Oceanography