caa a22 4500 397551290 CHVBK 20180308164751.0 cr unu---uuuuu 161202e199612 xx s 000 0 eng 10.1006/jmsc.1996.0116 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0116 A method for estimating primary production from chlorophyll concentrations with results showing trends in the Irish Sea and the Dutch coastal zone [Elektronische Daten] [Peter V. M. Bot, Franciscus Colijn] Analyses of long-term trends in physical, chemical, and biological parameters at selected locations along the residual current represent one of the objectives of the North-West European Shelf Programme (NOWESP). Within this framework, trends in chlorophyll concentrations at two of these localities, the Irish Sea and the Dutch coastal zone, were analysed. The results show an increase in the Irish Sea from the end of the 1960s onwards. Chlorophyll concentrations increased from the early 1980s at two stations in the Dutch coastal zone (Marsdiep and 6 km offshore of Goeree), followed by a decrease during the end of the 1980s and 1990s to values comparable with those of the 1970s. In both areas, the increase in chlorophyll is almost exclusively due to higher summer values. Estimates of gross annual primary production calculated from the relation between chlorophyll and primary production measurements indicate a 50 to 100% increase in the Irish Sea over the last three decades. Estimated mean annual production between 1976 and 1992 at Goeree 6 was 375 gC m−2. Marsdiep estimates are influenced by an increase of suspended particulate matter (SPM) during the 1980s followed by a marked reduction during the past 5 years. These changes in SPM may mask effects of changes in nutrient input. © 1996 International council for the Exploration of the Sea Articles nationallicence chlorophyll nationallicence Irish Sea nationallicence North Sea nationallicence primary production nationallicence Bot Peter V. M. RIKZ/National Institute of Coastal and Marine Research PO Box 20907, 2500 EX The Hague, The Netherlands aut Colijn Franciscus FTZ/Forschungs- und Technologie-zentrum Westküste Hafentörn, D-25761 Büsum, Germany aut ICES Journal of Marine Science Oxford University Press 53/6(1996-12), 945-950 1054-3139 53:6<945 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0116 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0116 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bot Peter V. M. RIKZ/National Institute of Coastal and Marine Research PO Box 20907, 2500 EX The Hague, The Netherlands aut NATIONALLICENCE 700 1- Colijn Franciscus FTZ/Forschungs- und Technologie-zentrum Westküste Hafentörn, D-25761 Büsum, Germany aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/6(1996-12), 945-950 1054-3139 53:6<945 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford