%0 Journal Article
%T Time-Space Variability of Chlorophyll-a and Associated Physical Variables within the Region off Central-Southern Chile
%A Carmen E. Morales
%A Samuel Hormazabal
%A Isabel Andrade
%A Marco A. Correa-Ramirez
%J Remote Sensing
%D 2013
%I MDPI AG
%R 10.3390/rs5115550
%X Time-space fluctuations of chlorophyll-a (Chl-a) within the region off central-southern Chile (33¨C42¡ãS), and their association with meteorological-oceanographic conditions, were analyzed using satellite time series data (2002¨C2012). The mean distribution of moderate values of Chl-a (~0.5 mg£¿m £¿3) in the northern section (33¨C38¡ãS) extended out to ~200 km of the coast whereas they were restricted to a narrower band in the southern section (38¨C42¡ãS). Mean wind stress and wind stress curl were upwelling favorable for most part of the year in the northern section whereas upwelling-downwelling periods were distinct in the southern section. The dominant frequency of Chl-a variability in the coastal zone and the coastal transition zone was annual, as it was for the rest of the variables, except in a transitional band between these zones and where a semi-permanent jet is located. At the annual frequency, the alongshore distribution of coastal Chl-a presented strong discontinuities, with minimum values around upwelling centers (~37 and 40¡ãS) and higher values (> 2 mg£¿m £¿3) in between. Also at the annual frequency, correlation analyses suggest that Ekman transport and Ekman pumping might act synchronously to extend the offshore distribution of the highest Chl-a values during the spring-summer period whereas mesoscale activity appears to contribute to Chl-a increases in the coastal transition zone. Sea surface temperature does not appear to be associated with the annual cycle of Chl-a in the coastal zone and in the coastal transition zone it might be linked to Chl-a variability through the effects of internal waves.
%K satellite Chl-a
%K annual cycle
%K wind-driven upwelling
%K alongshore and across-shore differences
%K central-southern Chile
%U http://www.mdpi.com/2072-4292/5/11/5550