Primary production of the Avacha Bay in summer 2017. S.P. ZAKHARKOV, E.V. LEPSKAYA, O.B. TEPNIN, E.A. SHTRAIKHERT, T.N. GORDEICHUK
Keywords:
the Avacha Bay, primary production, river flow, chlorophyll-a, remote sensingAbstract
Primary production of the Avacha Bay in summer 2017. S.P. ZAKHARKOV1, E.V. LEPSKAYA2, O.B. TEPNIN2,
E.A. SHTRAIKHERT1, T.N. GORDEICHUK1 (1V.I. Il’ichev Pacific Oceanological Institute, FEB RAS, Vladivostok,
2KamchatNIRO, Petropavlovsk-Kamchatsky).
The paper presents the results of a study of the spatial and temporal variability of the primary production of phytoplankton (PP) in the Avacha Bay of the Pacific Ocean in summer 2017. For the first time, measurements of PP by the radiocarbon method, mainly in the near-surface layer of water, conducted once a month, are published. Primary production in the water column was calculated by the formulas proposed by M. Behrenfeld and P. Falkovski. It is assumed that the level of PP in this season is determined by the following factors: the input of biogenic elements with a river runoff, turbidity and water temperature in the photic layer. The values of PP and the average concentrations of chlorophyll-a (Chl-a) allow us to attribute the bay to eutrophic water bodies.
At the same time, the Chl-a concentration values obtained by instrumental and remote sensing were compared. The
need for remote data correction was identified.