Seasonal and annual variability in chlorophyll-a in the shelf region of the Northern Bay of Bengal using MODIS-Aqua data

• Autorzy: Abdur Rouf Muhammad , Antu Al-Hasan , Noor Imran

Identyfikatory

DOI

10.1515/ohs-2020-0035

• Języki publikacji: EN

Abstrakty

EN

Chlorophyll-a (Chl-a) concentration is an important issue in ocean ecosystem management and research. This study investigates seasonal and annual variability in Chl-a and its relationship with sea surface temperature (SST) and river discharge in the shelf region of the Northern Bay of Bengal (BoB), as well as validates satellite data against in-situ data. Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua satellite data on Chl-a concentration and SST from 2002–2018 were used in this study. River discharge data were obtained from the Bangladesh Water Development Board (BWDB). The annual Chl-a concentration ranged from 2.08 to 2.94 mg m⁻³, with an average of 2.43 ± 0.24 mg m⁻³. The Chl-a concentration was found higher (2.21 ± 0.56 mg m⁻³) during the northeast monsoon (October–February) and lower (1.81 ± 1.14 mg m⁻³) during the pre-monsoon season (March–May). The study revealed a declining trend in Chl-a concentration from 2002 to 2018, and the rate of change was −0.0183 mg m⁻³ year⁻¹. Chl-a concentration showed a weak inverse relationship with SST, both annually and seasonally, especially in the pre-monsoon season. River discharge masked the effect of SST on Chl-a variability during the southwest and northeast monsoon. A reasonable correlation (r = 0.78) was found between the MODIS-Aqua data and in-situ Chl-a observations.

Słowa kluczowe

EN

annual variability; Bangladesh; Bay of Bengal; Chlorophyll-a; continental shelf; MODIS; seasonal variability

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2020
• Tom: Vol. 49, No. 4
• Strony: 398--407
• Opis fizyczny: Bibliogr. 44 poz.

Twórcy

autor

Abdur Rouf Muhammad

• Fisheries & Marine Resource Technology Discipline, Khulna University, Khulna, Bangladesh

autor

Antu Al-Hasan

• Fisheries & Marine Resource Technology Discipline, Khulna University, Khulna, Bangladesh

autor

Noor Imran

• Fisheries & Marine Resource Technology Discipline, Khulna University, Khulna, Bangladesh

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).