A model study of seasonal mixed-layer primary production in the Arabian Sea |
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| Authors: | John Brock Shubha Sathyendranath Trevor Platt |
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| Institution: | (1) Biological Oceanography Division, Bedford Institute of Oceanography, Box 1006, B2Y 4A2 Dartmouth, Nova Scotia, Canada;(2) Department of Oceanography, Dalhousie University, B3H 4J1 Halifax, Nova Scotia, Canada |
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| Abstract: | We combined a surface irradiance model with a non-spectral photosynthesisirradiance model to estimate the daily, average rate
of mixed-layer primary production in the Arabian Sea for the 15th day of months at the end of the northeast monsoon, the southwest
monsoon, and the fall and spring inter-monsoons. Our model experiment uses climatologies of cloud cover, mixed-layer thickness,
and satellite ocean-color observations of phytoplankton biomass.
Modelled surface radiation is at an annual maximum in May beneath nearly cloud-free skies just prior to the summer solstice.
The model estimate of surface radiation diminishes through the southwest monsoon over most of the northern Arabian Sea to
an annual minimum in August due to intense cloudiness.
In agreement with previous ship-based measurements, the photosynthesis-irradiance model predicts that the mixed-layer primary
production in the Arabian Sea is extremely seasonal, and peaks annually during the southwest monsoon to the north-west of
the atmospheric Findlater Jet and along the coast of Somalia. Northern Arabian Sea maxima predicted for both the summer and
winter monsoons are separated by periods of low mixed-layer primary production, the fall and spring inter-monsoons. The annual
cycles of modelled mixed-layer primary production differ by region in the Arabian Sea due to varying monsoon influence and
circulation dynamics. |
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| Keywords: | Arabian Sea primary production photosynthesis-light model |
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