 |
| Titel |
Atlantic transport variability at 25° N in six hydrographic sections |
| VerfasserIn |
C. P. Atkinson, H. L. Bryden, S. A. Cunningham, B. A. King |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1812-0784
|
| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 4 ; Nr. 8, no. 4 (2012-07-19), S.497-523 |
| Datensatznummer |
250005747
|
| Publikation (Nr.) |
 copernicus.org/os-8-497-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| In January and February 2010, a sixth transatlantic hydrographic section was
completed across 25° N, extending the hydrographic record at this
latitude to over half a century. In combination with continuous transport
measurements made since 2004 at 26.5° N by the Rapid-WATCH project,
we reassess transport variability in the 25° N hydrographic record.
Past studies of transport variability at this latitude have assumed transport
estimates from each hydrographic section to represent annual average
conditions. In this study the uncertainty in this assumption is assessed
through use of Rapid-WATCH observations to quantify sub-seasonal and seasonal
transport variability. Whilst in the upper-ocean no significant interannual
or decadal transport variability are identified in the hydrographic record,
in the deep ocean transport variability in both depth and potential
temperature classes suggests some interannual or decadal variability may have
occurred. This is particularly striking in the lower North Atlantic Deep
Water where southward transports prior to 1998 were greater than recent
transports by several Sverdrups. Whilst a cooling and freshening of Denmark
Straits Overflow Water has occurred which is coincident with these transport
changes, these water mass changes appear to be density compensated. Transport
changes are the result of changing velocity shear in the vicinity of the Deep
Western Boundary Current. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|