Heat and salinity budgets at the Stratus mooring in the southeast Pacific
Holte, James W.
Farrar, J. Thomas
Weller, Robert A.
MetadataShow full item record
The surface layer of the southeast Pacific Ocean (SEP) requires an input of cold, fresh water to balance heat gain, and evaporation from air-sea fluxes. Models typically fail to reproduce the cool sea surface temperatures (SST) of the SEP, limiting our ability to understand the variability of this climatically important region. We estimate the annual heat budget of the SEP for the period 2004–2009, using data from the upper 250 m of the Stratus mooring, located at 85°W 20°S, and from Argo floats. The surface buoy measures meteorological conditions and air-sea fluxes; the mooring line is heavily instrumented, measuring temperature, salinity, and velocity at more than 15 depth levels. We use a new method for estimating the advective component of the heat budget that combines Argo profiles and mooring velocity data, allowing us to calculate monthly profiles of heat advection. Averaged over the 6 year study period, we estimate a cooling advective heat flux of −41 ± 29 W m−2, accomplished by a combination of the mean gyre circulation, Ekman transport, and eddies. This compensates for warming fluxes of 32 ± 4 W m−2 due to air-sea fluxes and 7 ± 9 W m−2 due to vertical mixing and Ekman pumping. A salinity budget exhibits a similar balance, with advection of freshwater (−60 psu m) replenishing the freshwater lost through evaporation (47 psu m) and Ekman pumping (14 psu m).
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 8162–8176, doi:10.1002/2014JC010256.
Suggested CitationJournal of Geophysical Research: Oceans 119 (2014): 8162–8176
Showing items related by title, author, creator and subject.
Long-term evolution and coupling of the boundary layers in the Stratus Deck Regions of the eastern Pacific (STRATUS) Lucas, Lisanne E.; Way, Bryan S.; Weller, Robert A.; Bouchard, Paul R.; Fischer, Albert S.; Moffat, Carlos F.; Schneider, Wolfgang; Fewings, Melanie R. (Woods Hole Oceanographic Institution, 2001-06)A surface mooring was deployed in the eastern tropical Pacific west of northern Chile from the R/V Melville as part of the Eastern Pacific Investigation of Climate (EPIC). EPIC is a CLIVAR study with the goal of investigating ...
Long–term evolution and coupling of the boundary layers in the Stratus Deck Regions of the eastern Pacific (STRATUS) data report Vallee, Charlotte; Huang, Kelan; Weller, Robert A. (Woods Hole Oceanographic Institution, 2002-08)The surface mooring component of the CLIVAR Long Term Evolution and Coupling of the Boundary Layers in the Stratus Deck Regions study (STRATUS) took place from October 2000 in the eastern tropical Pacific. As part of the ...
Holte, James W.; Straneo, Fiamma; Moffat, Carlos F.; Weller, Robert A.; Farrar, J. Thomas (John Wiley & Sons, 2013-05-07)A number of studies have posited that coastally generated eddies could cool the southeast Pacific Ocean (SEP) by advecting cool, upwelled waters offshore. We examine this mechanism by characterizing the upper-ocean properties ...