期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 5, 页码 2388-2397出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL072416
关键词
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资金
- Spanish Ministry of Economy and Competitivity under STRAMIX research project [CTM2012-35155]
- Xunta de Galicia (Contrato Programa Xunta-CSIC)
- California Sea grant [2014-R/HCME-04]
- Natural Environment Research Council [pml010010] Funding Source: researchfish
- NERC [pml010010] Funding Source: UKRI
Bays/estuaries forced by local wind show bidirectional exchange flow. When forced by remote wind, they exhibit unidirectional flow adjustment to coastal sea level. Acoustic Doppler Current Profiler observations over 1year show that the Ria de Vigo (Iberian Upwelling) responds to coastal wind events with bidirectional exchange flow. The duration of the upwelling and downwelling events, estimated from the current variability, was similar to 3.3days and similar to 2.6days, respectively. Vectorial correlations reveal a rapid response to upwelling/downwelling, in which currents lag local wind by <6h and remote wind by <14h, less than the Ekman spinup (17.8h). This rapidity arises from the ria's narrowness (nonrotational local response), equatorward orientation (additive remote and local wind responses), depth greater than the Ekman depth (penetration of shelf circulation into the interior), and vertical stratification (shear reinforcing shelf circulation). Similar rapid responses are expected in other narrow bays where local and remote winds act together and stratification enhances bidirectional flow.
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