ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 1, pp. 148-162

Chlorophyll-a concentration and bio-optical characteristics in the Peter the Great Bay (Sea of Japan) during winter-spring phytoplankton bloom

E.A. Shtraikhert1 , S.P. Zakharkov1 , T.N. Gordeychuk1 , Ju.V. Shambarova1 
1 V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
Predominance of the light absorption by detritus and yellow substance in comparison with the absorption by phytoplankton pigments leads to the overestimation of satellite chlorophyll-a concentration values. Variability of the detritus and yellow substance content in water from start to end of the phytoplankton bloom in the surface water layer or at the runoff from coast can lead to variability of the difference between the satellite and real chlorophyll-a concentration values. Therefore, the increase or maximum of chlorophyll-a concentration, which are observed according to the satellite data, can not exist in reality. Temporal variability of chlorophyll-a concentration by means of satellite data and the influence of the variations of the detritus and yellow substance content in water on this variability for two areas of the Peter the Great Bay with the adjacent part, which differ in the temperature of the winter-spring phytoplankton bloom, were investigated in this work. According to the satellite data, averaged for 8- day, it is implemented the comparison between the temporal variability of the chlorophyll-a concentration and the variability of other satellite ocean color products, characterizing the phytoplankton vital functions (fluorescence of chlorophyll-a and light absorption by detritus and yellow substance), in shelf zone and the zone of the Primorye Current from January to May of 2003–2007. According to the daily satellite data, the relationships between the chlorophyll-a concentration and the above mentioned characteristics of ocean color at the observed peaks of chlorophyll-a concentrations were analyzed. The influence of light absorption by detritus and yellow substance on variability of error of satellite chlorophyll-a concentration values is shown. A comparison between the satellite and shipboard chlorophyll-a concentration values for the shelf zone was carried out at two temporal phytoplankton bloom periods, which followed one another and were characterized by increasing light absorption by detritus and yellow substance. The comparison showed growing discrepancy between these data. As a result, according to the satellite data the chlorophyll-a concentration from the first to the second of these periods increased, while according to the shipboard data, it decreased. An example of the increase of the satellite chlorophyll-a concentration value at the increase of light absorption by detritus and yellow substance caused by the runoff of organic matter from the coast as a result of precipitation is also considered.
Keywords: SeaWiFS, MODIS-Aqua, concentration and fluorescence of chlorophyll -a, light absorption by detritusand yellow substance, phytoplankton bloom
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