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Physicochemical controls on the initiation of phytoplankton bloom during the winter monsoon in the Arabian Sea
Lakshmi, R.S.; Prakash, S.; Lotliker, A.A.; Baliarsingh, S.K.; Samanta, A.; Mathew, T.; Chatterjee, A.; Sahu, B.K.; Nair, T.M.B. (2021). Physicochemical controls on the initiation of phytoplankton bloom during the winter monsoon in the Arabian Sea. NPG Scientific Reports 11(1): 13448 . https://dx.doi.org/10.1038/s41598-021-92897-3
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
Peer reviewed article  
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  • Lakshmi, R.S.
  • Prakash, S.
  • Lotliker, A.A.
  • Baliarsingh, S.K.
  • Samanta, A.
  • Mathew, T.
  • Chatterjee, A.
  • Sahu, B.K.
  • Nair, T.M.B.
Abstract
    Occurrence of phytoplankton bloom in the northern Arabian Sea (NAS) during the winter monsoon is perplexing. The convective mixing leads to a deeper and well-oxygenated (> 95% saturation) mixed layer. We encountered low chlorophyll conditions though the nutrient conditions were favorable for a bloom. The mean ratio of silicate (Si) to DIN (Dissolved Inorganic Nitrogen: nitrate + nitrite + ammonium) in the euphotic zone was 0.52 indicating a “silicate-stressed” condition for the proliferation of diatoms. Also, the euphotic depth was much shallower (~ 49 m) than the mixed layer (~ 110 m) suggesting the Sverdrup critical depth limitation in the NAS. We show that the bloom in this region initiates only when the mixed layer shoals towards the euphotic zone. Our observations further suggest that two primary factors, the stoichiometric ratio of nutrients, especially the Si/DIN ratio, in the mixed layer and re-stratification of the upper water column, govern the phytoplankton blooming in NAS during the later winter monsoon. The important finding of the present study is that the Sverdrup’s critical depth limitation gives rise to the observed low chl-a concentration in the NAS, despite having enough nutrients.
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