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Titolo:
Revisiting the South Pacific subtropical circulation: A synthesis of WorldOcean Circulation Experiment observations along 32 degrees S
Autore:
Wijffels, SE; Toole, JM; Davis, R;
Indirizzi:
CSIRO, Newtown, Tas 7008, Australia CSIRO Newtown Tas Australia 7008CSIRO, Newtown, Tas 7008, Australia Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA WoodsHole Oceanog Inst Woods Hole MA USA 02543 Woods Hole, MA 02543 USA Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ceanog, La Jolla, CA 92093 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C9, volume: 106, anno: 2001,
pagine: 19481 - 19513
SICI:
0148-0227(20010915)106:C9<19481:RTSPSC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOTAL GEOSTROPHIC CIRCULATION; ENERGY-TRANSPORT; FLOW PATTERNS; NORTH PACIFIC; FRESH-WATER; WIND STRESS; HEAT; FLUXES; 24-DEGREES-N; VARIABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Wijffels, SE CSIRO, GPO 1538, Newtown, Tas 7008, Australia CSIRO GPO 1538 Newtown Tas Australia 7008 Tas 7008, Australia
Citazione:
S.E. Wijffels et al., "Revisiting the South Pacific subtropical circulation: A synthesis of WorldOcean Circulation Experiment observations along 32 degrees S", J GEO RES-O, 106(C9), 2001, pp. 19481-19513

Abstract

Hydrographic data about latitudes 30 degrees -32 degreesS in the Pacific Ocean are presented and used together with direct velocity observations fromfloats and moorings to investigate the spatial distribution of meridional flow and its associated transports. An initial velocity scheme is developedwith reference to the water property distributions that is subsequently adjusted to meet constraints on net mass and dissolved silica transports. Theresulting circulation is found to be sensitive to a priori scaling assumptions and differs in detail from past estimates of the flow in this region. Additionally constraining the flow with directly measured time averaged estimates of the velocity from floats and a current meter array significantly reduces the uncertainty in the derived flow field and improves consistency between the velocity and the property distributions. The derived circulation includes a nearly closed bottom-to-deep-water overturning circulation of 16-20 Sv, below a subtropical gyre flow of thermocline and surface waters consisting of nearly distinct Tasman Sea (similar to 30 Sv) and basin interior (similar to 10 Sv) circulations and (a prescribed) similar to 10 +/- 5 Sv of net northward flow to supply the Indonesian and Bering Strait throughflows. On the basis of this circulation scheme, the heat flux divergence forthe Pacific north of the P6 line is estimated to be 0.75 +/- 0.56 pW (ocean gaining heat from the atmosphere) and the net freshwater divergence is estimated to be 0.1 +/- 0.1 Sv (ocean gains fresh water via air-sea exchange and runoff). The former is highly dependent on the strength of the Indonesian throughflow; the latter also depends on the intensity of the lateral subtropical gyre circulation, which is constrained by the float data. Combinedwith estimates from the Indian and Atlantic Oceans, we find the subtropical Southern Hemisphere oceans transport 0.46 +/- 0.38 PW poleward, less thanhalf the poleward heat transport achieved by the subtropical oceans in theNorthern Hemisphere.

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Documento generato il 29/03/20 alle ore 17:48:01