Phosphorus in rainwater: partitioning inputs and impact on the surface coastal ocean
Article Abstract:
Phosphate concentrations in rainwater and their impact and input on surface coastal ocean are discussed based on measurement at a coastal sampling site over the course of a year with soluble and particulate fractions differentiated, as were complexed and reactive phases in the dissolved fraction. The object was to evaluate the atmospheric supply of bioavailable phosphorus (P). Soil-derived dust from the Sahara was seen to be an important source of the atmospheric P. Anthropogenic emissions seem to be the source of a large part of the bioavailable P. The atmosphere has a major role in oligotrophic periods in the western Mediterranean.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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Dissolved organic nitrogen and phosphorus pools and fluxes in the central Atlantic Ocean
Article Abstract:
A study in the central Atlantic Ocean found that dissolved organic nitrogen (DON) had high concentrations in surface waters and lower concentrations toward the thermocline, whereas concentrations of dissolved organic phosophorus (DOP) did not vary as much with depth. The median ratio of DON to DOP was 28:1. Size of DON and DOP pools, stoichiometry, estimates of downward fluxes, and comparison of downward fluxes with upward fluxes of nitrate and phosphate are discussed. The study was conducted along a quasi-meridional transect from the Canary Islands to Argentina.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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Nitrate uptake and diffusive nitrate supply in the Central Atlantic
Article Abstract:
A sharp latitudinal gradient has been found in calculated diffusive nitrate flux in a studies across the thermocline in the Central Atlantic. The lowest levels of nitrate supply occur in the South Atlantic subtropical gyre, while the highest levels occur between the Equator and 15 degrees N. Uptake rates of both ammonium and nitrate are lowest at the transect's southern end, increasing towards the Equator. The lowest nitrate uptake rate is far in excess of the diffusive supply, with additional nitrate probably obtained from atmospheric deposition.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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