Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production
Observations of wintertime nutrient concentrations in surface waters are scarce in the temperate and subarctic North Atlantic Ocean. Three new methods of their estimation from spring or early summer observations are described and evaluated. The methods make use of a priori knowledge of the vertical...
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ftoceanrep:oai:oceanrep.geomar.de:8513 2023-05-15T17:32:09+02:00 Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production Koeve, Wolfgang 2001 text https://oceanrep.geomar.de/id/eprint/8513/ https://oceanrep.geomar.de/id/eprint/8513/1/1-s2.0-S0304420301000160-main.pdf https://doi.org/10.1016/S0304-4203(01)00016-0 en eng Elsevier https://oceanrep.geomar.de/id/eprint/8513/1/1-s2.0-S0304420301000160-main.pdf Koeve, W. (2001) Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production. Marine Chemistry, 74 (4). pp. 245-260. DOI 10.1016/S0304-4203(01)00016-0 <https://doi.org/10.1016/S0304-4203%2801%2900016-0>. doi:10.1016/S0304-4203(01)00016-0 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2001 ftoceanrep https://doi.org/10.1016/S0304-4203(01)00016-0 2023-04-07T14:56:49Z Observations of wintertime nutrient concentrations in surface waters are scarce in the temperate and subarctic North Atlantic Ocean. Three new methods of their estimation from spring or early summer observations are described and evaluated. The methods make use of a priori knowledge of the vertical distribution of oxygen saturation and empirical relationships between nutrient concentrations and oxygen saturation. A south–north increase in surface water winter nutrient concentration is observed. Winter nitrate concentrations range from very low levels of about 0.5 μmol dm−3 at 33°N to about 13.5 μmol dm−3 at 60°N. Previous estimates of winter nitrate concentrations have been overestimates by up to 50%. At the Biotrans Site (47°N, 20°W), a typical station in the temperate Northeast Atlantic, a mean winter nitrate concentration of 8 μmol dm−3 is estimated, compared to recently published values between 11 and 12.5 μmol dm−3. It is shown that most of the difference is due to a contribution of remineralised nitrate that had not been recognized in previous winter nutrient estimates. Mesoscale variation of wintertime nitrate concentrations at Biotrans are moderate (less than ±15% of the regional mean value of about 8 μmol dm−3). Interannual variation of the regional mean is small, too. In the available dataset, there was only 1 year with a significantly lower regional mean winter nitrate concentration (7 μmol dm−3), presumably due to restricted deep mixing during an atypically warm winter. The significance of winter nitrate estimates for the assessment of spring-bloom new production and the interpretation of bloom dynamics is evaluated. Applying estimates of wintertime nitrate concentrations of this study, it is found that pre-bloom new production (0.275 mol N m−2) at Biotrans almost equals spring-bloom new production (0.3 mol N m−2). Using previous estimates of wintertime nitrate yields unrealistically high estimates of pre-bloom new production (1.21–1.79 mol N m−2) which are inconsistent with observed levels of ... Article in Journal/Newspaper North Atlantic Northeast Atlantic Subarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Marine Chemistry 74 4 245 260 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Observations of wintertime nutrient concentrations in surface waters are scarce in the temperate and subarctic North Atlantic Ocean. Three new methods of their estimation from spring or early summer observations are described and evaluated. The methods make use of a priori knowledge of the vertical distribution of oxygen saturation and empirical relationships between nutrient concentrations and oxygen saturation. A south–north increase in surface water winter nutrient concentration is observed. Winter nitrate concentrations range from very low levels of about 0.5 μmol dm−3 at 33°N to about 13.5 μmol dm−3 at 60°N. Previous estimates of winter nitrate concentrations have been overestimates by up to 50%. At the Biotrans Site (47°N, 20°W), a typical station in the temperate Northeast Atlantic, a mean winter nitrate concentration of 8 μmol dm−3 is estimated, compared to recently published values between 11 and 12.5 μmol dm−3. It is shown that most of the difference is due to a contribution of remineralised nitrate that had not been recognized in previous winter nutrient estimates. Mesoscale variation of wintertime nitrate concentrations at Biotrans are moderate (less than ±15% of the regional mean value of about 8 μmol dm−3). Interannual variation of the regional mean is small, too. In the available dataset, there was only 1 year with a significantly lower regional mean winter nitrate concentration (7 μmol dm−3), presumably due to restricted deep mixing during an atypically warm winter. The significance of winter nitrate estimates for the assessment of spring-bloom new production and the interpretation of bloom dynamics is evaluated. Applying estimates of wintertime nitrate concentrations of this study, it is found that pre-bloom new production (0.275 mol N m−2) at Biotrans almost equals spring-bloom new production (0.3 mol N m−2). Using previous estimates of wintertime nitrate yields unrealistically high estimates of pre-bloom new production (1.21–1.79 mol N m−2) which are inconsistent with observed levels of ... |
format |
Article in Journal/Newspaper |
author |
Koeve, Wolfgang |
spellingShingle |
Koeve, Wolfgang Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production |
author_facet |
Koeve, Wolfgang |
author_sort |
Koeve, Wolfgang |
title |
Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production |
title_short |
Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production |
title_full |
Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production |
title_fullStr |
Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production |
title_full_unstemmed |
Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production |
title_sort |
wintertime nutrients in the north atlantic - new approaches and implications for estimates of seasonal new production |
publisher |
Elsevier |
publishDate |
2001 |
url |
https://oceanrep.geomar.de/id/eprint/8513/ https://oceanrep.geomar.de/id/eprint/8513/1/1-s2.0-S0304420301000160-main.pdf https://doi.org/10.1016/S0304-4203(01)00016-0 |
genre |
North Atlantic Northeast Atlantic Subarctic |
genre_facet |
North Atlantic Northeast Atlantic Subarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/8513/1/1-s2.0-S0304420301000160-main.pdf Koeve, W. (2001) Wintertime nutrients in the North Atlantic - New approaches and implications for estimates of seasonal new production. Marine Chemistry, 74 (4). pp. 245-260. DOI 10.1016/S0304-4203(01)00016-0 <https://doi.org/10.1016/S0304-4203%2801%2900016-0>. doi:10.1016/S0304-4203(01)00016-0 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0304-4203(01)00016-0 |
container_title |
Marine Chemistry |
container_volume |
74 |
container_issue |
4 |
container_start_page |
245 |
op_container_end_page |
260 |
_version_ |
1766130113153335296 |