Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events
We examined interannual variability in the 1965–1990 winter‐summer differences in surface nitrate (ΔNO 3 ) in the northeast subarctic Pacific Ocean (Station P, 50°N, 145°W). Increases in ΔNO 3 , of 30–70% above the mean value occurred during four events (1969, 1971‐1972, 1979, 1983). The ΔNO 3 time...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.1998.43.7.1418 2024-09-30T14:44:28+00:00 Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events Wong, C. S. Whitney, F. A. Matear, R. J. Iseki, K. 1998 http://dx.doi.org/10.4319/lo.1998.43.7.1418 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1998.43.7.1418 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1998.43.7.1418 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 43, issue 7, page 1418-1426 ISSN 0024-3590 1939-5590 journal-article 1998 crwiley https://doi.org/10.4319/lo.1998.43.7.1418 2024-09-03T04:22:53Z We examined interannual variability in the 1965–1990 winter‐summer differences in surface nitrate (ΔNO 3 ) in the northeast subarctic Pacific Ocean (Station P, 50°N, 145°W). Increases in ΔNO 3 , of 30–70% above the mean value occurred during four events (1969, 1971‐1972, 1979, 1983). The ΔNO 3 time series was highly correlated ( r = 0.86) with the spring‐summer nitrate utilization rate from 1970 to 1980. The ΔNO 3 time series was negatively correlated with the North Pacific index (NPI) ( r = ‐0.72) and positively correlated with solar radiation in the spring ( r = 0.48) and summer ( r = 0.46). A simple ecosystem model forced with observed incident solar radiation and mixed‐layer depth during the spring‐summer period predicted increases in export production that were 50% of the observed increase for 1970–1972 and 1977–1979. Comparison between the ΔNO 3 and sedimenting particulate organic nitrogen (PON) showed that the high ΔNO 3 event of 1983 was associated with a dramatic increase in PON fluxes. A simple ecosystem model underpredicts observed interannual variations in export production, and this result combined with the observed PON fluxes suggests that a combination of increased phytoplankton production and increased f ratio produced the observed increase in ΔNO 3 . The increase in f ‐ratio implies a change in the community structure of the phytoplankton during the elevated ΔNO 3 events that appears connected to changes in the NPI. Article in Journal/Newspaper Subarctic Wiley Online Library Pacific Limnology and Oceanography 43 7 1418 1426 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We examined interannual variability in the 1965–1990 winter‐summer differences in surface nitrate (ΔNO 3 ) in the northeast subarctic Pacific Ocean (Station P, 50°N, 145°W). Increases in ΔNO 3 , of 30–70% above the mean value occurred during four events (1969, 1971‐1972, 1979, 1983). The ΔNO 3 time series was highly correlated ( r = 0.86) with the spring‐summer nitrate utilization rate from 1970 to 1980. The ΔNO 3 time series was negatively correlated with the North Pacific index (NPI) ( r = ‐0.72) and positively correlated with solar radiation in the spring ( r = 0.48) and summer ( r = 0.46). A simple ecosystem model forced with observed incident solar radiation and mixed‐layer depth during the spring‐summer period predicted increases in export production that were 50% of the observed increase for 1970–1972 and 1977–1979. Comparison between the ΔNO 3 and sedimenting particulate organic nitrogen (PON) showed that the high ΔNO 3 event of 1983 was associated with a dramatic increase in PON fluxes. A simple ecosystem model underpredicts observed interannual variations in export production, and this result combined with the observed PON fluxes suggests that a combination of increased phytoplankton production and increased f ratio produced the observed increase in ΔNO 3 . The increase in f ‐ratio implies a change in the community structure of the phytoplankton during the elevated ΔNO 3 events that appears connected to changes in the NPI. |
format |
Article in Journal/Newspaper |
author |
Wong, C. S. Whitney, F. A. Matear, R. J. Iseki, K. |
spellingShingle |
Wong, C. S. Whitney, F. A. Matear, R. J. Iseki, K. Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events |
author_facet |
Wong, C. S. Whitney, F. A. Matear, R. J. Iseki, K. |
author_sort |
Wong, C. S. |
title |
Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events |
title_short |
Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events |
title_full |
Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events |
title_fullStr |
Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events |
title_full_unstemmed |
Enhancement of new production in the northeast subarctic Pacific Ocean during negative North Pacific index events |
title_sort |
enhancement of new production in the northeast subarctic pacific ocean during negative north pacific index events |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.4319/lo.1998.43.7.1418 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1998.43.7.1418 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1998.43.7.1418 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 43, issue 7, page 1418-1426 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.1998.43.7.1418 |
container_title |
Limnology and Oceanography |
container_volume |
43 |
container_issue |
7 |
container_start_page |
1418 |
op_container_end_page |
1426 |
_version_ |
1811645725760552960 |