Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions
Interannual correlation between satellite-derived sea surface temperature (SST) and surface chlorophyll <i>a</i> (Chl <i>a</i>) 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...
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doaj-9cd163482a104a4b90467499dc1c79b22020-11-25T00:39:59ZengCopernicus PublicationsOcean Science1812-07841812-07922014-05-0110334535510.5194/os-10-345-2014Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditionsH. Herrera-Cervantes0S. E. Lluch-Cota1D. B. Lluch-Cota2G. Gutiérrez-de-Velasco3Unidad La Paz, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), La Paz, Baja California Sur 23050, MéxicoCentro de Investigaciones Biológicas del Noroeste (CIBNOR), Instituto Politécnico Nacional 195, La Paz, Baja California Sur 23096, MéxicoCentro de Investigaciones Biológicas del Noroeste (CIBNOR), Instituto Politécnico Nacional 195, La Paz, Baja California Sur 23096, MéxicoDepartamento de Física, Universidad de Guadalajara, MéxicoInterannual correlation between satellite-derived sea surface temperature (SST) and surface chlorophyll <i>a</i> (Chl <i>a</i>) 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 EOF<sub>1</sub> analysis showed the greater variability of SST and Chl <i>a</i> 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 (<i>R</i> ≈ 0.67, <i>P</i> < 0.05) and poorly with the individual Chl <i>a</i> principal component (<i>R</i> = −0.13). The joint EOF<sub>1</sub> and the SST–Chl <i>a</i> correlation patterns show the area where both variables covary tightly; a band near the coast where the largest correlations occurred (| <i>R</i> | > 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 <i>a</i> 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 <i>a</i>. 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.http://www.ocean-sci.net/10/345/2014/os-10-345-2014.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
H. Herrera-Cervantes S. E. Lluch-Cota D. B. Lluch-Cota G. Gutiérrez-de-Velasco |
spellingShingle |
H. Herrera-Cervantes S. E. Lluch-Cota D. B. Lluch-Cota G. Gutiérrez-de-Velasco Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions Ocean Science |
author_facet |
H. Herrera-Cervantes S. E. Lluch-Cota D. B. Lluch-Cota G. Gutiérrez-de-Velasco |
author_sort |
H. Herrera-Cervantes |
title |
Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions |
title_short |
Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions |
title_full |
Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions |
title_fullStr |
Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions |
title_full_unstemmed |
Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions |
title_sort |
interannual correlations between sea surface temperature and concentration of chlorophyll pigment off punta eugenia, baja california, during different remote forcing conditions |
publisher |
Copernicus Publications |
series |
Ocean Science |
issn |
1812-0784 1812-0792 |
publishDate |
2014-05-01 |
description |
Interannual correlation between satellite-derived sea surface temperature
(SST) and surface chlorophyll <i>a</i> (Chl <i>a</i>) 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 EOF<sub>1</sub> analysis showed the greater
variability of SST and Chl <i>a</i> 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 (<i>R</i> ≈ 0.67, <i>P</i> < 0.05) and poorly
with the individual Chl <i>a</i> principal component (<i>R</i> = −0.13). The joint EOF<sub>1</sub> and the
SST–Chl <i>a</i> correlation patterns show the area where both variables covary
tightly; a band near the coast where the largest correlations occurred (| <i>R</i>
| > 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 <i>a</i> 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 <i>a</i>. 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. |
url |
http://www.ocean-sci.net/10/345/2014/os-10-345-2014.pdf |
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