Analysis: low oxygen concentrations and biogenic elements associated with Equatorial Subsurface water, and variability in Humboldt Current System off ChileEntry ID: GLOBEC_039_CHL_003
Abstract: Analysis of the distribution of low oxygen concentrations and
biogenic elements associated with the Equatorial Subsurface water
and characterization of seasonal and inter-annual variability in the
Humboldt Current System off Chile.
The Equatorial Subsurface Water (ESSW), which is characterized by low
dissolved oxygen content (<2 ml l-1) and high nutrient concentrations,
is one of the main sources ... of upwelling water in the area. It is
noticeable that the upper boundary of the oxygen minimum layer (OML)
is found at shallower depths in the coastal zone (25-50m) than in the
adjacent oceanic waters (50-100m), both off northern Chile and Peru.
This is a special feature of the Humboldt Current Eastern Boundary
System and is associated with an important de-nitrification regime in
the water column. Before this work was completed, information on the
sources of variability associated with the distribution of the ESSW
OML, the impact of these changes upon pelagic productivity in the
region and biogeochemical cycling was very limited.
The study was focused on three main areas:
- The distribution of low oxygen concentrations in the HCS
- Biogeochemical cycling in relation to the OML in the ESSW
- Biological/ecological effects upon pelagic organisms of the
OML in the ESSW
(Click for Interactive Map)
This data set description is a member of a collection. The collection is described in
OCEANS > OCEAN CHEMISTRY > BIOGEOCHEMICAL CYCLES
OCEANS > OCEAN CHEMISTRY > NITRATE
OCEANS > OCEAN CHEMISTRY > NITRITE
OCEANS > OCEAN CHEMISTRY > OXYGEN
OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS
BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON
BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON
BIOSPHERE > AQUATIC ECOSYSTEMS > PELAGIC HABITAT
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > SPECIES PREDATION
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > POPULATION DYNAMICS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOGEOCHEMICAL CYCLES
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > FOOD-WEB DYNAMICS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > NUTRIENT CYCLING
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > SECONDARY PRODUCTION
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > TROPHIC DYNAMICS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > OXYGEN DEMAND
Email: rescribano at uantof.cl
University of Antofagasta PO Box 170
Role: DIF AUTHOR
Phone: +44 (0)1752 633401
Fax: +44 (0)1752 633101
Email: globec at pml.ac.uk
GLOBEC International Project Office Plymouth Marine Laboratory Prospect Place
Postal Code: PL1 3DH
Published and In press
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northern Chile during El Nino 1997-1998. J. Plankton
Escribano, R., 1998. Population dynamics of Calanus chilensis in the
Chilean Eastern Boundary Humboldt Current. Fish. Oceanogr. 7:245-251.
Escribano, R. & P. Hidalgo, 2000. Spatial distribution of copepods
during active upwelling in Peninsula of Mejillones, northern Chile.
J. Mar. Biol. Ass. U. K. 80:283-290.
Escribano, R., V. Marin & C. Irribarren, 2000. Distribution of
Euphausia mucronata at the upwelling area of Peninsula Mejillones,
northern Chile: the influence of the oxygen minimum layer. Scientia
Morales, C. E., S. E. Hormazabal, J. L. Blanco, 1999. Interannual
variability in the mesoscale distribution of the upper boundary of the
oxygen minimum layer in the upwelling area off northern Chile (18-24
degrees S): implications for the pelagic system and biogeochemical
cycling. J. Mar. Res. 57: 909-932.
Castro, L. R., V. A. Troncoso & D. Figueroa. Water column partitioning
between offshore and nearshore copepods in shallow bays of coastal
upwelling areas. J. Exp. Mar. Biol. Ecol.
Morales, C. E., J. L. Blanco, M. J. Braun, & N. Silva. Chlorophyll-a
distribution in relationship to mesoscale physical features in the
upwelling and adjacent oceanic area off northern Chile.
J. Mar. Biol. Assoc. UK.
Quinones, R. A., Y. Eissler, G. Daneri & V. Dellarossa.
Microplanktonic respiration off central-north Chile
(Coquimbo, 30 degrees S) during 1994-1997. J. Plankton Res.
Ulloa, O., R. Escribano, S. Hormazabal, R. A. Quinones, R. Gonzalez &
M. Ramos. Biological effects of the 1997-98 El Nino in the upwelling
ecosystem of the eastern South Pacific. J. Geophys. Res
Creation and Review Dates
DIF Creation Date: 2001-08-06
Last DIF Revision Date: 2005-04-19