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| Titel |
Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions |
| VerfasserIn |
H. Herrera-Cervantes, S. E. Lluch-Cota, D. B. Lluch-Cota, G. Gutiérrez-de-Velasco |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2014-05-14), S.345-355 |
| Datensatznummer |
250116995
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| Publikation (Nr.) |
 copernicus.org/os-10-345-2014.pdf |
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| Zusammenfassung |
| Interannual correlation between satellite-derived sea surface temperature
(SST) and surface chlorophyll a (Chl a) are examined in the coastal
upwelling zone off Punta Eugenia on the west coast of the Baja California
Peninsula, an area than has been identified as having intense biological
productivity and oceanographic transition between midlatitude and tropical
ocean conditions. We used empirical orthogonal functions (EOF) analysis
separately and jointly on the two fields from 1997 through 2007, a time
period dominated by different remote forcing: ENSO (El Niño–Southern Oscillation) conditions (weak, moderate
and strong) and the largest intrusion of subarctic water reported in the last
50 years. Coastal upwelling index anomalies (CUI) and the multivariate ENSO
index (MEI) were used to identify the influence of local (wind stress) and
remote (ENSO) forcing over the interannual variability of both variables. The
spatial pattern of the individual EOF1 analysis showed the greater
variability of SST and Chl a offshore, their corresponding amplitude time
series presented the highest peaks during the strong 1997–2000 El
Niño–La Niña cycles and during the 2002–2004 period associated to the intrusion
of subarctic water. The MEI is well correlated with the individual SST
principal component (R ≈ 0.67, P < 0.05) and poorly
with the individual Chl a principal component (R = −0.13). The joint EOF1 and the
SST–Chl a correlation patterns show the area where both variables covary
tightly; a band near the coast where the largest correlations occurred (| R
| > 0.4) mainly regulated by ENSO cycles. This was spatially
revealed when we calculated the homogeneous correlations for the 1997–1999
El Niño–La Niña period and during the 2002–2004 period, the intrusion of
subarctic water period. Both, SST and Chl a showed higher coupling and two
distinct physical–biological responses: on average ENSO influence was
observed clearly along the coast mostly in SST, while the subarctic water
influence, observed offshore and in Bahía Vizcaíno, mostly in
Chl a. We found coastal chlorophyll blooms off Punta Eugenia during
the 2002–2003 period, an enrichment pattern similar to that observed off the coast of
Oregon. These chlorophyll blooms are likely linked to high wind stress
anomalies during 2002, mainly at high latitudes. This observation may provide
an explanation of why Punta Eugenia is one of the most important biological
action centers on the Pacific coast. |
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