Journal Article

Underestimation of Latent and Sensible Heat Fluxes above the Agulhas Current in NCEP and ECMWF Analyses

Reason, C. J. C., Rouault, M., Lutjeharms, J. R. E., Beljaars, A. C. M.

2003

Overview

The Agulhas Current is the major western boundary current of the Southern Hemisphere. South of Africa it retroflects back into the southwest Indian Ocean, transporting relatively warm water into the midlatitudes. Large sensible and latent heat transfers from the Agulhas Current and its retroflection to the atmosphere occur throughout the year, but particularly during winter. This study suggests that the NCEP and ECMWF models tend to underestimate these fluxes because they are unable to adequately represent the air–sea fluxes over the warmest waters in the core of the current. This core is only 80–100 km wide and it is suggested that the SST data used by these models do not have fine enough spatial resolution to properly represent the Agulhas Current and its mesoscale variability.

• Publisher: American Meteorological Society
• Subject: Advanced very high resolution radiometers / Air currents / Analysis / Cruises / Dynamics of the ocean (upper and deep oceans) / Earth, ocean, space / Exact sciences and technology / External geophysics / Gulfs / Heat / Latent heat / NOTES AND CORRESPONDENCE / Ocean currents / Oceans / Physics of the oceans / Sea water / Sea-air exchange processes / Seas / Sensible heat / Storms