Dinitrogen fixation rates in the Bay of Bengal during summer monsoon
Abstract Biological dinitrogen (N 2 ) fixation exerts an important control on oceanic primary production by providing bioavailable form of nitrogen (such as ammonium) to photosynthetic microorganisms. N 2 fixation is dominant in nutrient poor and warm surface waters. The Bay of Bengal is one such re...
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crioppubl:10.1088/2515-7620/ab89fa 2024-09-15T18:26:22+00:00 Dinitrogen fixation rates in the Bay of Bengal during summer monsoon Saxena, Himanshu Sahoo, Deepika Khan, Mohammad Atif Kumar, Sanjeev Sudheer, A K Singh, Arvind DST-INSPIRE Deapartment of Space 2020 http://dx.doi.org/10.1088/2515-7620/ab89fa https://iopscience.iop.org/article/10.1088/2515-7620/ab89fa https://iopscience.iop.org/article/10.1088/2515-7620/ab89fa/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0/ https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Communications volume 2, issue 5, page 051007 ISSN 2515-7620 journal-article 2020 crioppubl https://doi.org/10.1088/2515-7620/ab89fa 2024-08-12T04:13:54Z Abstract Biological dinitrogen (N 2 ) fixation exerts an important control on oceanic primary production by providing bioavailable form of nitrogen (such as ammonium) to photosynthetic microorganisms. N 2 fixation is dominant in nutrient poor and warm surface waters. The Bay of Bengal is one such region where no measurements of phototrophic N 2 fixation rates exist. The surface water of the Bay of Bengal is generally nitrate-poor and warm due to prevailing stratification and thus, could favour N 2 fixation. We commenced the first N 2 fixation study in the photic zone of the Bay of Bengal using 15 N 2 gas tracer incubation experiment during summer monsoon 2018. We collected seawater samples from four depths (covering the mixed layer depth of up to 75 m) at eight stations. N 2 fixation rates varied from 4 to 75 μ mol N m −2 d −1 . The contribution of N 2 fixation to primary production was negligible (<1%). However, the upper bound of observed N 2 fixation rates is higher than the rates measured in other oceanic regimes, such as the Eastern Tropical South Pacific, the Tropical Northwest Atlantic, and the Equatorial and Southern Indian Ocean. Article in Journal/Newspaper Northwest Atlantic IOP Publishing Environmental Research Communications 2 5 051007 |
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description |
Abstract Biological dinitrogen (N 2 ) fixation exerts an important control on oceanic primary production by providing bioavailable form of nitrogen (such as ammonium) to photosynthetic microorganisms. N 2 fixation is dominant in nutrient poor and warm surface waters. The Bay of Bengal is one such region where no measurements of phototrophic N 2 fixation rates exist. The surface water of the Bay of Bengal is generally nitrate-poor and warm due to prevailing stratification and thus, could favour N 2 fixation. We commenced the first N 2 fixation study in the photic zone of the Bay of Bengal using 15 N 2 gas tracer incubation experiment during summer monsoon 2018. We collected seawater samples from four depths (covering the mixed layer depth of up to 75 m) at eight stations. N 2 fixation rates varied from 4 to 75 μ mol N m −2 d −1 . The contribution of N 2 fixation to primary production was negligible (<1%). However, the upper bound of observed N 2 fixation rates is higher than the rates measured in other oceanic regimes, such as the Eastern Tropical South Pacific, the Tropical Northwest Atlantic, and the Equatorial and Southern Indian Ocean. |
author2 |
DST-INSPIRE Deapartment of Space |
format |
Article in Journal/Newspaper |
author |
Saxena, Himanshu Sahoo, Deepika Khan, Mohammad Atif Kumar, Sanjeev Sudheer, A K Singh, Arvind |
spellingShingle |
Saxena, Himanshu Sahoo, Deepika Khan, Mohammad Atif Kumar, Sanjeev Sudheer, A K Singh, Arvind Dinitrogen fixation rates in the Bay of Bengal during summer monsoon |
author_facet |
Saxena, Himanshu Sahoo, Deepika Khan, Mohammad Atif Kumar, Sanjeev Sudheer, A K Singh, Arvind |
author_sort |
Saxena, Himanshu |
title |
Dinitrogen fixation rates in the Bay of Bengal during summer monsoon |
title_short |
Dinitrogen fixation rates in the Bay of Bengal during summer monsoon |
title_full |
Dinitrogen fixation rates in the Bay of Bengal during summer monsoon |
title_fullStr |
Dinitrogen fixation rates in the Bay of Bengal during summer monsoon |
title_full_unstemmed |
Dinitrogen fixation rates in the Bay of Bengal during summer monsoon |
title_sort |
dinitrogen fixation rates in the bay of bengal during summer monsoon |
publisher |
IOP Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1088/2515-7620/ab89fa https://iopscience.iop.org/article/10.1088/2515-7620/ab89fa https://iopscience.iop.org/article/10.1088/2515-7620/ab89fa/pdf |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Environmental Research Communications volume 2, issue 5, page 051007 ISSN 2515-7620 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/2515-7620/ab89fa |
container_title |
Environmental Research Communications |
container_volume |
2 |
container_issue |
5 |
container_start_page |
051007 |
_version_ |
1810466846714888192 |