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| Titel |
Towards closure of regional heat budgets in the North Atlantic using Argo floats and surface flux datasets |
| VerfasserIn |
N. C. Wells, S. A. Josey, R. E. Hadfield |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 2 ; Nr. 5, no. 2 (2009-04-22), S.59-72 |
| Datensatznummer |
250002414
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| Publikation (Nr.) |
 copernicus.org/os-5-59-2009.pdf |
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| Zusammenfassung |
| The upper ocean heat budget (0–300 m) of the North Atlantic from
20°–60° N is investigated using data from Argo profiling floats for
1999–2005 and the NCEP/NCAR and NOC surface flux datasets. Estimates of the
different terms in the budget (heat storage, advection, diffusion and
surface exchange) are obtained using the methodology developed by Hadfield
et al. (2007a, b). The method includes optimal interpolation of the
individual profiles to produce gridded fields with error estimates at a
10°×10° grid box resolution. Closure of the heat budget is
obtained within the error estimates for some regions – particularly the
eastern subtropical Atlantic – but not for those boxes that include the Gulf
Stream. Over the whole range considered, closure is obtained for 13 (9) out
of 20 boxes with the NOC (NCEP/NCAR) surface fluxes. The seasonal heat
budget at 20–30° N, 35–25° W is considered in detail. Here, the NCEP
based budget has an annual mean residual of −55±35 Wm−2
compared with a NOC based value of −4±35 Wm−2. For this box,
the net heat divergence of 36 Wm−2 (Ekman=−4 Wm−2,
geostrophic=11 Wm−2, diffusion=29 Wm−2) offsets the net heating
of 32 Wm−2 from the NOC surface heat fluxes. The results in this box
are consistent with an earlier evaluation of the fluxes using measurements
from research buoys in the subduction array which revealed biases in NCEP
but good agreement of the buoy values with the NOC fields. |
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