Abstract
Satellite data on chlorophyll concentration from ESA (CCI-OC) and Goddard Space Flight Center, NASA and shipboard observations of CTD, P, N, Si, inorganic carbon, DCI, and Chlaat 38 stations in the northeastern Japan Sea (46th cruise of RV Academik M.A. Lavrentyev on July 9–19, 2009) are analyzed. The highest chlorophyll concentrations were found in the subsurface layer (depth 20–40 m) or even deeper in the Polar Front zone, so they were not reflected in the satellite data. The minimal depths of the subsurface maximum were observed northward from the Polar Front where the estimations of chlorophyll concentration in the upper optical layer (Zd= 1/kd) were similar for the shipboard and satellite measurements (on average 0.384 ± 0.160 mg/m3 and 0.406 ± 0.120 mg/m3, respectively). Primary production was calculated using the assimilation number 4.46 mgC/mgChl per hour. Depth of euphotic layer was estimated using the vertical profles of nutrients and Chla. Within this layer, the primary production in the northeastern Japan Sea was evaluated for the shipboard stations as 895–2275 mgС.m–2.day–1, on average 1450 ± 430 mgС.m–2.day–1, and for the satellite data on average 770 ± 190 mgС.m–2.day–1. The estimations based on the shipboard and satellite data were weakly correlated. The shipboard estimations exceed considerably the results obtained by Koblents-Mishke et al. (1956, 1970) and Yamada et al. (2005). Poor accuracy of satellite estimations of primary production is concluded because the deeper part of the euphotic layer with the maximum concentration of chlorophyll is in shadow for satellite sensors.
Highlights
Ключевые слова: хлорофилл, эвфотический слой, фотосинтез, судовые и спутниковые данные первичной продукции, северная часть Японского моря
The highest chlorophyll concentrations were found in the subsurface layer or even deeper in the Polar Front zone, so they were not reflected in the satellite data
The primary production in the northeastern Japan Sea was evaluated for the shipboard stations as 895–2275 mgС.m–2.day–1, on average 1450 ± 430 mgС.m–2.day–1, and for the satellite data on average 770 ± 190 mgС.m–2.day–1
Summary
Проанализированы судовые и спутниковые данные 38 стаций, выполненных в северо-восточной части Японского моря в 46-м рейсе НИС «Академик М.А. Что ПП северной части Японского моря превышала 500 мгС/(м2 . Ранее (Звалинский и др., 2006) нами были проведены измерения содержания биогенных элементов, Хл и величины ПП (радиоуглеродным методом) в столбе воды в северо-западной части Японского моря по результатам экспедиции на НИС «Профессор Гагаринский» в осенний период (12.10–03.11) 2000 г. В данной работе проводится сравнение судовых и спутниковых оценок биооптических свойств воды, содержания Хл в толще фотического слоя и ПП в северо-восточной части Японского моря Содержание Хл рассчитывалось для каждого горизонта по глубине в пределах фотического слоя, при этом судовые данные концентрации Хл были линейно интерполированы в горизонты с шагом 0,5 м: Chleu = 0,5. Горизонтальные пунктирные линии указывают глубину максимумов Хл, сплошные — нижнюю границу эвфотической зоны Zeu
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