dc.contributor.author | Lundsør, Elisabeth | |
dc.contributor.author | Stige, Leif Christian | |
dc.contributor.author | Sørensen, Kai | |
dc.contributor.author | Edvardsen, Bente | |
dc.date.accessioned | 2020-09-10T13:48:06Z | |
dc.date.available | 2020-09-10T13:48:06Z | |
dc.date.created | 2020-09-03T10:38:28Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Journal of Sea Research. 2020, 164, 101925. | en_US |
dc.identifier.issn | 1385-1101 | |
dc.identifier.uri | https://hdl.handle.net/11250/2677299 | |
dc.description.abstract | In this study we have compiled a long-term monitoring dataset from the inner Oslofjorden and supplemented it with short-term research data from the same station. Using generalized additive models analysing the data from this time series, we have examined how chlorophyll-a, hydrography, and various nutrient concentrations have changed during 1973–2017 and how they correlate. We describe the seasonality in chlorophyll-a, nitrogen, phosphorus, Secchi-depth, temperature and salinity and how the levels of each variable have changed the last forty years. The results show specifically how levels of chlorophyll-a have decreased significantly and how this correlates with decrease in nitrogen and phosphorus levels. Our results show a significantly positive correlation between chlorophyll-a and phosphorus during spring bloom and between chlorophyll-a and nitrogen during autumn bloom. However, phosphorus levels have increased again during the last 20 years, but chlorophyll-a levels are still low, indicating that the chlorophyll-a level currently may be controlled by the continuous decreasing trend in nitrogen. If nitrogen increase again, the chlorophyll-a level may also begin to increase. The impact of increasing temperature and possible change in starting point for the growing season should be studied further. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Long-term coastal monitoring data show nutrient-driven reduction in chlorophyll | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.source.pagenumber | 13 | en_US |
dc.source.volume | 164 | en_US |
dc.source.journal | Journal of Sea Research | en_US |
dc.identifier.doi | 10.1016/j.seares.2020.101925 | |
dc.identifier.cristin | 1826994 | |
dc.relation.project | Norges forskningsråd: 280468 | en_US |
dc.relation.project | Norges forskningsråd: 262960 | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |