 |
| Titel |
Structure of ocean circulation between the Galápagos Islands and Ecuador |
| VerfasserIn |
C. Collins, A. Mascarenhas, R. Martínez |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7340
|
| Digitales Dokument |
URL |
| Erschienen |
In: ENSO South America ; Nr. 33 (2013-04-02), S.3-12 |
| Datensatznummer |
250019075
|
| Publikation (Nr.) |
 copernicus.org/adgeo-33-3-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
From 27 March to 5 April 2009, upper ocean velocities between the
Galápagos Islands and Ecuador were measured using a vessel mounted ADCP.
A region of possible strong cross-hemisphere exchange was observed
immediately to the east of the Galápagos, where a shallow (200 m) 300 km
wide northeastward surface flow transported 7–11 Sv. Underlying this strong
northeastward surface current, a southward flowing undercurrent was observed
which was at least 600 m thick, 100 km wide, and had an observed transport
of 7–8 Sv. Next to the Ecuador coast, the shallow (< 200 m) Ecuador
Coastal Current was observed to extend offshore 100 km with strongest flow,
0.33 m s−1, near the surface. Immediately to the west of the Ecuador Coastal
Current, flow was directed eastward and southward into the beginnings of the
Peru-Chile Countercurrent.
The integral of the surface currents between the Galápagos and Ecuador
agreed well with observed sea level differences. Although the correlation of
the sea level differences with large scale climate indices (Niño3 and
the Southern Oscillation Index) was significant, more than half of the sea
level variability was not explained. Seasonal variability of the sea level
difference indicated that sea level was 2 cm higher at the Galápagos
during late winter and early spring, which could be associated with the
pattern of northward surface flows observed by R/V Knorr. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|