| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Physical control of interannual variations of the winter chlorophyll bloom in the northern Arabian Sea
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| Autores: |
Keerthi, Madhavan Girijakumari
Lengaigne, Matthieu
Levy, Marina
Vialard, Jerome
Parvathi, Vallivattathillam
De Boyer Montegut, Clement
Ethe, Christian
Aumont, Olivier
Suresh, Iyyappan
Akhil, Valiya Parambil
Muraleedharan, Pillathu Moolayil
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| Data: |
2017-08
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| Ano: |
2017
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| Resumo: |
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 similar to 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 (similar to 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00395/50625/51332.pdf
DOI:10.5194/bg-14-3615-2017
http://archimer.ifremer.fr/doc/00395/50625/
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| Editor: |
Copernicus Gesellschaft Mbh
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| Formato: |
application/pdf
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| Fonte: |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2017-08 , Vol. 14 , N. 15 , P. 3615-3632
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| Direitos: |
Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License
info:eu-repo/semantics/openAccess
restricted use
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