Analysis of the spatial evolution of the 2003 algal bloom in the Voordelta (North Sea)     

Hendrik Jan van der Woerd  Anouk Blauw  Louis Peperzak  Reinold Pasterkamp  Steef Peters 《Journal of Sea Research》2011,65(2):195-204

Phaeocystis blooms in the Southern Bight of the North Sea may cause damage to the aquatic ecosystem and to commercial mussel cultures at the entrance of the Oosterschelde estuary. In this paper the potential for early detection of Phaeocystis blooms in Dutch coastal waters is studied, using a combination of field data, satellite observations and hydrodynamic- and biological modelling. For the spring bloom period in the year 2003 MERIS chlorophyll-a maps, derived with the HYDROPT algorithm for coastal waters, were compared to in-situ measurements at stations off the coast in de Voordelta and the results of the GEM biogeochemical model.The analysis shows that the spatial and temporal variability in Phaeocystis abundance and total biomass (expressed by the Chl-a concentration) during spring is large. It is confirmed that blooms may develop off shore and show a tendency to accumulate within 10 km from the coastline, giving rise to rapid biomass accumulation at the mouth of the multiple estuaries in the Voordelta. Based on the outcome of this study an early warning system is proposed that notifies local water managers and shellfish growers for potentially harmful Phaeocystis bloom formation.  相似文献   

Über das Vorkommen von Chlorit im alpinen Salinar     

P. Reinold 《Mineralogy and Petrology》1965,9(3):195-201

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Remotely sensed seasonality in the spatial distribution of sea-surface suspended particulate matter in the southern North Sea     

Marieke A. Eleveld  Reinold Pasterkamp  Hendrik J. van der Woerd  Julie D. Pietrzak 《Estuarine, Coastal and Shelf Science》2008

An algorithm is presented for estimating near-surface SPM concentrations in the turbid Case 2 waters of the southern North Sea. The single band algorithm, named POWERS, was derived by parameterising Gordon's approximation of the radiative transfer model with measurements of Belgian and Dutch inherent optical properties. The algorithm was used to calculate near-surface SPM concentration from 491 SeaWiFS datasets for 2001. It was shown to be a robust algorithm for estimating SPM in the southern North Sea. Regression of annual geometric mean SPM concentration derived from remote sensing (SPM_rs), against in situ (SPM_is) data from 19 Dutch monitoring stations was highly significant with an r² of 0.87. Further comparison and statistical testing against independent datasets for 2000 confirmed the consistency of this relationship. Moreover, time series of SPM_rs concentrations derived from the POWERS algorithm, were shown to follow the same temporal trends as individual SPM_is data recorded during 2001. Composites of annual, winter and summer SPM_rs for 2001 highlight the three dominant water masses in the southern North Sea, as well as their winter–fall and spring–summer variability. The results indicate that wind induced wave action and mixing cause high surface SPM signals in winter in regions where the water column becomes well mixed, whereas in summer stratification leads to a lower SPM surface signal. The presented algorithm gives accurate near-surface SPM concentrations and could easily be adapted for other water masses and seas.  相似文献   

Beitrag zur Geochemie der ostalpinen Salzlagerstätten     

Paul Reinold 《Mineralogy and Petrology》1965,10(1-4):505-527

Zusammenfassung Unter Anwendung von verschiedenen analytischen Methoden wurden die Spurengehalte in Steinsalzen der ostalpinen Salzlagerstätten untersucht. Neben Spurenelementen von untergeordneter Bedeutung, wie Calcium, Strontium, Bor, Mangan, Kupfer, Blei und Lithium, wurde vor allem den Spurenkonzentrationen an Kalium und Brom das Hauptaugenmerk zugewandt. Das Ergebnis der Untersuchungen zeigt, daß Kalium und Brom miteinander korrelierbar sind, wobei sich allerdings eine Abhängigkeit zu den Erscheinungsformen des Halites und damit der Mineralisationsfolge des Steinsalzes ergibt. Kernsalz, und Kerngebirge einschließlich des Augensalzes weisen höhere Kaliumgehalte auf, die etwa dem Durchschnitt der marinen Salzlagerstätten entsprechen; den jüngeren Salzmineralisationen geht das Kalium und in geringerem Maße das Brom verloren. Die jüngste Bildung, das Blättersalz, zeichnet sich durch geringere Bromgehalte aus. Das Kalium-Brom-Verhältnis ermöglicht es, zwischen Primär- und Sekundärausscheidung zu unterscheiden.

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Summary Applying different analytical methods, the trace-contents in rock-salts of the Eastern Alpine salt-deposits are investigated. Besides trace-elements of subordinated importance like calcium, strontium, boron, manganese, copper, lead and lithium, the principal interest was turned towards the trace-concentrations of potassium and bromine. The result of the investigations shows that potassium and bromine give a correlation, but yields a dependence to the type of mineral-forming of the halites and therefore a mineralisation-succession of the rock-salts. Core-salts (Kernsalz) and core-mountains (Kerngebirge), salt-eyes (Augensalz) included, show higher contents of potassium. On the average they agree with the marine saltdeposits. The younger salt-mineralisations lose the potassium and in smaller extent the bromine. The youngest mineralisation, the recent leaf-salt (Blättersalz) marks smaller concentration of bromine. The ratio potassium-bromine enbles the distinction of primary and secondary rocksalt-mineralisations.

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Mit 10 Textabbildungen

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Herrn Professor Dr.F. Machatschki zum 70. Geburtstag gewidmet.  相似文献