Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal
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...
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| Format: | Article |
| Language: | English |
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Elsevier
2017-07-01
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| Series: | Oceanologia |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0078323417300210 |
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| author | Sourav Das Isha Das Sandip Giri Abhra Chanda Sourav Maity Aneesh A. Lotliker T. Srinivasa Kumar Anirban Akhand Sugata Hazra |
| author_facet | Sourav Das Isha Das Sandip Giri Abhra Chanda Sourav Maity Aneesh A. Lotliker T. Srinivasa Kumar Anirban Akhand Sugata Hazra |
| author_sort | Sourav Das |
| collection | DOAJ |
| description | 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 m−1–0.6631 m−1 and 0.0071 nm−1–0.0229 nm−1 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. |
| first_indexed | 2024-12-14T04:54:01Z |
| format | Article |
| id | doaj.art-f76b740796b6452abb66c768622c6cac |
| institution | Directory Open Access Journal |
| issn | 0078-3234 |
| language | English |
| last_indexed | 2024-12-14T04:54:01Z |
| publishDate | 2017-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj.art-f76b740796b6452abb66c768622c6cac2022-12-21T23:16:28ZengElsevierOceanologia0078-32342017-07-0159327128210.1016/j.oceano.2017.03.002Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of BengalSourav Das0Isha Das1Sandip Giri2Abhra Chanda3Sourav Maity4Aneesh A. Lotliker5T. Srinivasa Kumar6Anirban Akhand7Sugata Hazra8School of Oceanographic Studies, Jadavpur University, Kolkata, IndiaSchool of Oceanographic Studies, Jadavpur University, Kolkata, IndiaSchool of Oceanographic Studies, Jadavpur University, Kolkata, IndiaSchool of Oceanographic Studies, Jadavpur University, Kolkata, IndiaIndian National Centre for Ocean Information Services, Kukatpally, Hyderabad, IndiaIndian National Centre for Ocean Information Services, Kukatpally, Hyderabad, IndiaIndian National Centre for Ocean Information Services, Kukatpally, Hyderabad, IndiaCoastal and Estuarine Environment Research Group, Port and Airport Research Institute, Nagase, Yokosuka, JapanSchool of Oceanographic Studies, Jadavpur University, Kolkata, IndiaThe 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 m−1–0.6631 m−1 and 0.0071 nm−1–0.0229 nm−1 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.http://www.sciencedirect.com/science/article/pii/S0078323417300210aCDOM(440)Spatio-temporal variabilitySea surface salinityNorthern Bay of Bengal |
| spellingShingle | Sourav Das Isha Das Sandip Giri Abhra Chanda Sourav Maity Aneesh A. Lotliker T. Srinivasa Kumar Anirban Akhand Sugata Hazra Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal Oceanologia aCDOM(440) Spatio-temporal variability Sea surface salinity Northern Bay of Bengal |
| title | Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal |
| title_full | Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal |
| title_fullStr | Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal |
| title_full_unstemmed | Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal |
| title_short | Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the northern Bay of Bengal |
| title_sort | chromophoric dissolved organic matter cdom variability over the continental shelf of the northern bay of bengal |
| topic | aCDOM(440) Spatio-temporal variability Sea surface salinity Northern Bay of Bengal |
| url | http://www.sciencedirect.com/science/article/pii/S0078323417300210 |
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