physical control of interannual variations of the winter chlorophyll bloom in the northern arabian sea
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2017
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Abstract
The northern Arabian Sea hosts a winter chlorophyll bloom,
triggered by convective overturning in response to cold and dry northeasterly
monsoon winds. Previous studies of interannual variations of this bloom only
relied on a couple of years of data and reached no consensus on the
associated processes. The current study aims at identifying these processes
using both ∼ 10 years of observations (including
remotely sensed chlorophyll data and physical parameters derived from Argo
data) and a 20-year-long coupled biophysical ocean model simulation. Despite
discrepancies in the estimated bloom amplitude, the six different
remotely sensed chlorophyll products analysed in this study display a good
phase agreement at seasonal and interannual timescales. The model and
observations both indicate that the interannual winter bloom fluctuations are
strongly tied to interannual mixed layer depth anomalies ( ∼ 0.6
to 0.7 correlation), which are themselves controlled by the net heat flux at
the air–sea interface. Our modelling results suggest that the mixed layer
depth control of the bloom amplitude ensues from the modulation of nutrient
entrainment into the euphotic layer. In contrast, the model and observations
both display insignificant correlations between the bloom amplitude and
thermocline depth, which precludes a control of the bloom amplitude by daily
dilution down to the thermocline depth, as suggested in a previous study.
| Reference Key |
keerthi2017biogeosciencesphysical
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|---|---|
| Authors | ;M. G. Keerthi;M. Lengaigne;M. Lengaigne;M. Levy;J. Vialard;V. Parvathi;C. de Boyer Montégut;C. Ethé;O. Aumont;I. Suresh;V. P. Akhil;P. M. Muraleedharan |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-3615-2017
|
| URL | |
| Keywords |
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