Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the Northern Bay of Bengal

• Autorzy: Das S. , Das I. , Giri S. , Chanda A. , Maity S. , Lotliker A.A. , Kumar T.S. , Akhand A. , Hazra S.
• Języki publikacji: EN

Abstrakty

EN

The present paper dealt with the annual dynamics of the absorption coefficient of chromophoric dissolved organic matter at 440 nm {aCDOM(440)} during February 2015 to January 2016 in the continental shelf of northern Bay of Bengal (nBoB) for the first time. Sea surface salinity (SSS), chlorophyll-a (Chl-a), total suspended matter (TSM) were also analyzed. It was hypothesized that CDOM should exhibit significant spatial and temporal variability in this region. aCDOM(440) and spectral slope ranged between 0.1002 m1—0.6631 m1 and 0.0071 nm1— 0.0229 nm1 respectively during the entire study period. Higher values of aCDOM(440) were observed in the near shore stations and gradually decreased towards the offshore. Significant seasonal variability of aCDOM(440) was observed between the monsoon and non-monsoon seasons ( p < 0.05). Thus the framed hypothesis was successfully accepted by means of the present study. The CDOM was mainly found to be of allochthonous character in this region. aCDOM(440) portrayed a significant negative linear relationship with SSS (R2 = 0.80; p < 0.05) implying conservative mixing of marine and terrestrial end members. However, examining the spatial variability of the relationship, it was observed that this relationship was significant only in the nearshore stations. While examining the seasonal variability of this relationship, it was found to be most significant during the monsoon (R2 = 0.81; p < 0.05). Thus it was inferred that whenever the SSS gradient was higher, the relationship between aCDOM(440) and SSS was found to be most significant.

Słowa kluczowe

EN

chromophoric dissolved organic matter; absorption coefficient; sea surface; salinity; chlorophyll a; total suspended matter; spatio-temporal variability; Bengal Bay; continental shelf

• Wydawca: -
• Czasopismo: Oceanologia
• Rocznik: 2017
• Tom: 59
• Numer: 3
• Opis fizyczny: p.271-282,fig.,ref.

Twórcy

autor

Das S.

• School of Oceanographic Studies, Jadavpur University, Jadavpur, 188 Raja S.C. Mullick Road, Kolkata 700032, West Bengal, India

autor

Das I.

• School of Oceanographic Studies, Jadavpur University, Kolkata, India

autor

Giri S.

• School of Oceanographic Studies, Jadavpur University, Kolkata, India

autor

Chanda A.

• School of Oceanographic Studies, Jadavpur University, Kolkata, India

autor

Maity S.

• Indian National Centre for Ocean Information Services, Kukatpally, Hyderabad, India

autor

Lotliker A.A.

• Indian National Centre for Ocean Information Services, Kukatpally, Hyderabad, India

autor

Kumar T.S.

• Indian National Centre for Ocean Information Services, Kukatpally, Hyderabad, India

autor

Akhand A.

• Coastal and Estuarine Environment Research Group, Port and Airport Research Institute, Nagase, Yokosuka, Japan

autor

Hazra S.

• School of Oceanographic Studies, Jadavpur University, Kolkata, India

Identyfikatory

DOI

10.1016/j.oceano.2017.03.002