Nitrate use by plankton in the eastern subtropical North Atlantic, March-April 1989
Nitrate concentration was measured in seawater samples from the euphotic zone at the beginning and end of 12-h, daytime, in situ incubations. The changes in concentration are considered to be measurements of new production. During periods of 2-3 weeks in March-April 1989, important time scales for N...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
ASLO (Association for the Sciences of Limnology and Oceanography)
1990
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| Subjects: | |
| Online Access: | https://oceanrep.geomar.de/id/eprint/13663/ https://oceanrep.geomar.de/id/eprint/13663/1/1781.pdf |
| Summary: | Nitrate concentration was measured in seawater samples from the euphotic zone at the beginning and end of 12-h, daytime, in situ incubations. The changes in concentration are considered to be measurements of new production. During periods of 2-3 weeks in March-April 1989, important time scales for NO3- input to the euphotic zone (i.e. residence times) and new production were approximately 26 d at 18-degrees-N, 31-degrees-W and approximately 10 d near 33-degrees-N, 21-degrees-W. The average rate of NO3- use in the two areas was 2.63 and 0.62 mmol N m-2 (12 h)-1, or, in carbon equivalents 209 and 49 mg C m-2 d-1, respectively. These values bracket the large-scale estimate by Jenkins of new production in the nearby beta triangle of 150 mg C m-2 d-1. |
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