HR: 1400h
AN: PP43B-07 [Abstracts]
TI: The Coastal upwellings of the Baja California Peninsula during the 1997-2003 ENSO conditions, through remote sensing
AU: * Castro, J
EM: jorge@mar.icmyl.unam.mx
AF: Universidad nacional Autonoma de Mexico. Instituto de Ciencias del Mar y Limnologia,
Ciudad Universitaria, Coyoacan, Mexico, DF 04510, Mexico
AU: Salas-de-Leon, D
EM: salas@mar.icmyl.unam.mx
AF: Universidad nacional Autonoma de Mexico. Instituto de Ciencias del Mar y Limnologia,
Ciudad Universitaria, Coyoacan, Mexico, DF 04510, Mexico
AU: Aguirre-Gomez, R
EM: jorge@mar.icmyl.unam.mx
AF: Universidad Nacional Autonoma de Mexico. Instituto de Geografia, Ciudad Universitaria,
Coyoacan, Mexico, DF 04510, Mexico
AB:
Upwelling interannual variation study was conducted in Baja California peninsula based on several parameters.
Wind stress (upwelling index), Sea Surface Temperature (SST), Area Sea Surface Temperature (15°C), Sea
Surface High (SSH) and, Chlorophyll-a (Chl-a) data were analyzed in order to compare ENSO conditions
between 1997 and 2003.
Our result indicate that SST and SSH were expected to ENSO conditions. Upwellings index was high during weak
El Nino 2003 and less evident during La Nina 1998-2001 events. On the other hand, Chl-a biomass was 50%
lower during El Nino 1997-98 than records of La Nina 1998-2001 and showed its maximum value during
transition conditions in 2002. Chl-a biomass was similar in El Nino 2003 and La Nina 1998-2001. Our data do
not match with the current proposed hypothesis that El Nino depress primary productivity (PP), while La Niña
promotes high PP. These conditions are according only with the strong El Nino 1997-1998 in the southern
California Current System; however during weak-to moderate events the conditions area variable in the region
and inter-events. This supports the idea that southern CCS is also modulated by different inter-annual
oscillations, as the North Pacific Decadal Oscillation.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1640 Remote sensing (1855)
DE: 4279 Upwelling and convergences (4964)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Joint Assembly