Identification of the coastal zone of the central and eastern Gulf of Finland by numerical modeling, measurements, and remote sensing ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2009-04-17

AUTHORS

Gennadi Lessin, Viktoria Ossipova, Inga Lips, Urmas Raudsepp

ABSTRACT

A combination of numerical modeling results with measurement and satellite imagery data was used during the biologically active period for the determination of the coastal zone extent in the central and eastern Gulf of Finland. Adopting the approach that the coastal zone can be identified by the spatial distribution of biotic parameters, spatial variations and gradients of chlorophyll a (chl-a) concentrations were analyzed. The results showed that chl-a concentrations vary in a wide range over the biologically active period. During heavy blooms, the coastal zone may appear occasionally and depend on the spatial distribution of the bloom. On average, clear limits of the coastal zone could be defined for the central and eastern Gulf of Finland. In the central Gulf of Finland, water and material exchange are rather intensive, and the coastal zone is narrower than in the eastern Gulf. In the easternmost part of the Gulf of Finland, chl-a concentrations were permanently high in an area of about 100 km width due to the discharge of the Neva River. The study has shown that gradients of chl-a spatial distribution can be applied for determining limits of the coastal zone extent. The standardized gradient of zero is shown to be a threshold separating the coastal zone (standardized gradients > 0) from the open sea (standardized gradients < 0). More... »

PAGES

187-198

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10750-009-9770-4

DOI

http://dx.doi.org/10.1007/s10750-009-9770-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003575660


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