Net primary productivity, upwelling and coastal currents in the Gulf of Ulloa, Baja California, Mexico

Abstract

The Gulf of Ulloa, a highly productive area off the western coast of Baja California Peninsula, is examined for five successive years (2003–2007) by using satellite data and seasonal net primary productivity estimates obtained by a vertical generalized production model. The results clearly identify a seasonal signal of coastal upwelling in productivity estimates. Highest values occur from May to June and sometimes July. We also find influence of an equatorward coastal current able of transporting water from neighboring north upwelling areas to the Gulf of Ulloa in winter–spring. This flow contributes to increase the seasonal net primary productivity. The opposite occurs in summer, when a warm poleward current of tropical characteristics arrives to the region. Our findings reveal that such warm coastal current suppressed the productivity in the whole

Interannual correlations between sea surface temperature and concentration of chlorophyll pigment off Punta Eugenia, Baja California, during different remote forcing conditions

“…In this study, we used EOF analysis both separately and jointly over satellite-derived SST and Chl a anomaly data off Punta Eugenia, a region with high levels of biological productivity that is associated with wind-driven upwelling processes (González-Rodriguez et al, 2012;Lluch-Belda et al, 2000), which has allowed us a wide-ranging view of the biophysical coupling during ENSO events and the largest intrusion of subarctic water reported in the last 50 years (Huyer, 2003;Venrick et al, 2003). Moreover, by relating each SST and Chl a series within ∼ 30 km of the coast of Punta Eugenia to two independent variables, MEI and CUI, and by following the coastal signal of the Chl a related to the intrusion of subarctic water from 45 to 22 • N; to our knowledge, this is the first time that physical-biological covariability driven by remote forcing (tropical and subarctic origin) off Punta Eugenia has been examined at this level of detail.…”

“…1) as an oceanographic transitional zone (Durazo and Baumgartner, 2002), characterized by the interaction of subarctic and tropical waters (Almazán-Becerril et al, 2012) the convergence of the southern part of the California Current (CC) and the North Equatorial Current (NEC). Its shelf is about 50-90 km wide, including Bahía Vizcaíno, this becomes narrow and almost disappears off Punta Eugenia (González-Rodriguez et al, 2012). The area is also influenced by warm and dense water originating in the Gulf of California (Parés-Sierra et al, 1997), creating a complex mixing zone between coastal and oceanic flows and intense mesoscale variability characterized by a complex pattern of filaments, meanders, and semipermanent eddy structures (Gallaudet and Simpson, 1994).…”

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“…Produktivitas primer dapat diestimasi dengan menggunakan data penginderaan jarak jauh (Ishizaka et al, 2010;Joo et al, 2015;Lee et al, 2015;Yen and Lu, 2016;González-Rodríguez et al, 2012;Shang et al, 2010). Salah satu citra satelit yang dapat digunakan untuk mengestimasi produktivitas primer di perairan adalah satelit Aqua dengan sensor MODIS (Moderate Resolution Imaging Spectroradiometer) level 3 dengan resolusi 4 km.…”

Studi Variabilitas Produktivitas Primer Bersih Serta Hubungannya dengan El-Nino Southern Oscillasion (ENSO) dan Indian Ocean Dipole (IOD) di Laut Banda Berdasarkan Data Satelit Aqua MODIS

“…Produktivitas primer bersih dapat diestimasi dengan menggunakan data penginderaan jarak jauh (Ishizaka et al, 2010;Joo et al, 2015;Lee et al, 2015;Yen and Lu, 2016;Deng et al, 2017;González-Rodríguez et al, 2012;Shang et al, 2010). Salah satu citra satelit yang dapat digunakan untuk mengestimasi produktivitas primer bersih di perairan adalah satelit Aqua dengan sensor MODIS (Moderate Resolution Imaging Spectroradiometer) level 3 dengan resolusi 4 km.…”