期刊
MARINE AND FRESHWATER RESEARCH
卷 64, 期 2, 页码 168-184出版社
CSIRO PUBLISHING
DOI: 10.1071/MF12075
关键词
hydrological process; north-eastern Brazil; primary production; uplifting; variability
资金
- Ministry of Environment, Direction of Hydrography and Navigation through program REVIZEE
- ANTARES oceanographical ship through program REVIZEE
- CAPES (Ministry of Education, Brazil)
Data collected on two large-scale surveys around the seamounts and islands off north-eastern Brazil during 1997 and 1998 provided information on the distribution of Chlorophyll a and inorganic nutrients. During both surveys, the concentrations of Chlorophyll a and nutrients were highly patchy. The highest measurement of Chlorophyll a was 3.91 mu g L-1 during 1997. A wide range of nutrient concentrations were found, from undetectable values to a maximum of 17.52 mu ML-1 (Si), 1.37 mu ML-1 (PO4), 10.02 mu ML-1 (NO3) and 0.72 mu ML-1 (NO2). In 1998, concentrations of Chlorophyll a and nutrients (nitrite and nitrate) were far more uniform, with Chlorophyll a concentrations lower and phosphate concentrations generally higher than in 1997. Topography-flow interaction on thermohaline structures was observed around Saint Peter and Saint Paul Archipelago and in the Fernando de Noronha Chain, creating a patchy pattern around the island and seamounts. Nutrients exhibited an inverse linear relationship with temperature and salinity and an exponential decay relationship with Chlorophyll a.
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