Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 6, pp. 110-118
The small eddies in the White Sea and their influence on chlorophyll distribution in the Onega Bay
O.A. Atadzhanova
1, 2 , A.V. Zimin
1, 2 1 St. Petersburg Department of P.P. Shirshov Institute of Oceanology RAS, Saint-Petersburg, Russia
2 Russian State Hydrometeorological University, Saint-Petersburg, Russia
Accepted: 07.07.2016
DOI: 10.21046/2070-7401-2016-13-6-110-118
Based on the diverse data, this study illustrates the occurrence of small (submesoscale) eddy structures in the Onega Bay of the White Sea and assesses their impact on the distribution of chlorophyll. The data included the results of processing of synthetic aperture radar (SAR) images from 2009 to 2012, satellite optic images in 2010 and 2015, and contact measurements on the local oceanographic polygons from 2006 to 2015. Quasi-operational remote sensing experiment in 2015 was based on comparing with close time data of satellite optical sensors and contact measurements. By all data, eddy structures about 2 km in size were most often detected, and this size is close to the climatic estimate of the internal deformation radius in the Onega Bay. Some of these submesoscale structures were manifested in the surface layer about 15 m thickness during 3–4 hours. Areas of increased occurrence of eddies on SAR images were characterized by anomalies of chlorophyll distribution and by presence of spots of cold or warm water. It is found that eddies of large size (> 8 km) almost always occurred simultaneously in different satellite data. This finding was not correct for smaller vortices (< 2 km), and the contact experiment including measurements of chlorophyll confirmed this result.
Keywords: submesoscale eddies, satellite and in-situ observations, chlorophyll concentration, White Sea
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