The coupled boundary layers and air-sea transfer experiment in low winds
Edson, James B.
Farrar, J. Thomas
Frew, Nelson M.
Gerbi, Gregory P.
Plueddemann, Albert J.
Trowbridge, John H.
Weller, Robert A.
Williams, Albert J.
MetadataShow full item record
The Office of Naval Research's Coupled Boundary Layers and Air–Sea Transfer (CBLAST) program is being conducted to investigate the processes that couple the marine boundary layers and govern the exchange of heat, mass, and momentum across the air–sea interface. CBLAST-LOW was designed to investigate these processes at the low-wind extreme where the processes are often driven or strongly modulated by buoyant forcing. The focus was on conditions ranging from negligible wind stress, where buoyant forcing dominates, up to wind speeds where wave breaking and Langmuir circulations play a significant role in the exchange processes. The field program provided observations from a suite of platforms deployed in the coastal ocean south of Martha's Vineyard. Highlights from the measurement campaigns include direct measurement of the momentum and heat fluxes on both sides of the air–sea interface using a specially constructed Air–Sea Interaction Tower (ASIT), and quantification of regional oceanic variability over scales of O (1–104 mm) using a mesoscale mooring array, aircraft-borne remote sensors, drifters, and ship surveys. To our knowledge, the former represents the first successful attempt to directly and simultaneously measure the heat and momentum exchange on both sides of the air–sea interface. The latter provided a 3D picture of the oceanic boundary layer during the month-long main experiment. These observations have been combined with numerical models and direct numerical and large-eddy simulations to investigate the processes that couple the atmosphere and ocean under these conditions. For example, the oceanic measurements have been used in the Regional Ocean Modeling System (ROMS) to investigate the 3D evolution of regional ocean thermal stratification. The ultimate goal of these investigations is to incorporate improved parameterizations of these processes in coupled models such as the Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) to improve marine forecasts of wind, waves, and currents.
Author Posting. © American Meteorological Society, 2007. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Bulletin of the American Meteorological Society 88 (2007): 341-356, doi:10.1175/bams-88-3-341.
Showing items related by title, author, creator and subject.
Plueddemann, Albert J.; Ostrom, William M.; Galbraith, Nancy R.; Bouchard, Paul R.; Tupper, George H.; Dunn, James M.; Walsh, M. Alexander (Woods Hole Oceanographic Institution, 2002-09)The Northwest Tropical Atlantic Station (NTAS) was established to address the need for accurate air-sea flux estimates and upper ocean measurements in a region with strong sea surface temperature anomalies and the ...
Fluid mechanical measurements within the boundary layer over the northern California Continental Shelf during STRESS Fredericks, Janet J.; Trowbridge, John H.; Williams, Albert J.; Lentz, Steven J.; Butman, Bradford; Gross, Thomas F. (Woods Hole Oceanographic Institution, 1993-09)In studying the processes controlling particle distrbution of fine sediments over the continental shelf, the height, structure and dynamics of the bottom boundary layer must be better understood. The Sediment Transport ...
Edson, James B.; Jampana, Venkata; Weller, Robert A.; Bigorre, Sebastien P.; Plueddemann, Albert J.; Fairall, Christopher W.; Miller, Scott D.; Mahrt, Larry; Vickers, Dean; Hersbach, Hans; Zhao, F. (American Meteorological Society, 2013-08)This study investigates the exchange of momentum between the atmosphere and ocean using data collected from four oceanic field experiments. Direct covariance estimates of momentum fluxes were collected in all four experiments ...