Inconsistent response of biophysical characteristics in the western Bay of Bengal associated with positive Indian Ocean dipole

Seelanki, Vivek; Nigam, Tanuja; Pant, Vimlesh

doi:10.1016/j.oceano.2022.04.003

Artykuł - szczegóły

Tytuł artykułu

Inconsistent response of biophysical characteristics in the western Bay of Bengal associated with positive Indian Ocean dipole

Autorzy

Seelanki Vivek , Nigam Tanuja , Pant Vimlesh

Wybrane pełne teksty z tego czasopisma

Identyfikatory

DOI

10.1016/j.oceano.2022.04.003

Warianty tytułu

Języki publikacji

Abstrakty

The Bay of Bengal (BoB) is known to have high primary productivity at its western margin during the Indian summer monsoon season (June–September). This higher coastal productivity is mainly caused due to the near-surface nutrient availability maintained by the local coastal upwelling process. The surface winds in the Indian Ocean significantly vary during El-Niño/La-Niña and Indian Ocean dipole (IOD). The current study examines the sea surface temperature (SST) and Chlorophyll-a (Chl-a) anomalies in the western BoB for the period of 18 years (2000 to 2017), using a coupled regional ocean biophysical model. All considered positive IOD (pIOD) years show discrete behavior of biophysical features in the western BoB. The co-occurrence years of pIOD and El-Niño modes are associated with contrast biophysical anomalies. In the analyzed pIOD events, the years 2006 and 2012 show an enhancement in the Chl-a anomalies whereas, the other two years (2015 and 2017) experience Chl-a decrement. The western BoB was anomalously warmer during the 2015 and 2017 pIOD years compared to the other two pIOD years (2006, 2012). This inconsistent response of biophysical features associated with pIOD years is investigated in terms of local surface flux (momentum, heat, and freshwater) changes over the western BoB. The combined impact of local surface flux changes during the individual years remains the major contributing factor affecting the upper-ocean stratification. Ultimately, the stratification changes are responsible for the observed inconsistent response of biophysical features by significantly altering the upper-ocean mixing, upwelling, and nutrient availability in the western BoB.

Słowa kluczowe

chlorophyll-a Ekman transport Bay of Bengal primary productivity Indian Ocean dipole biophysical model

Wydawca

Polish Academy of Sciences, Institute of Oceanology
Elsevier

Czasopismo

Oceanologia

Rocznik

2022

Tom

No. 64 (4)

Strony

595--614

Opis fizyczny

Bibliogr. 120 poz., map., rys., wykr.

Twórcy

autor

Seelanki Vivek

Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India

autor

Nigam Tanuja

Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India
National Institute of Oceanography, Goa, India

https://orcid.org/0000-0003-0718-5936

autor

Pant Vimlesh

vimlesh@cas.iitd.ac.in

Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India

https://orcid.org/0000-0002-9564-8605

Bibliografia

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Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).

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