Spatial and Temporal Variability of Satellite Primary Production in the Japan Sea from 1998 to 2002

Yamada, Keiko; Ishizaka, Joji; Nagata, Hiroshi

doi:10.1007/s10872-006-0005-2

Cited by 108 publications

(106 citation statements)

References 16 publications

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“…The maximum observed photosynthetic rate within the water column, P opt B , is obtained as a 7th-order polynomial of SST. (Yamada et al, 2005;Kameda and Ishizaka, 2005). The model is based on the assumptions that changes in chlorophyll concentration depend on the abundance of large phytoplankton and that chlorophyll-specific productivity is inversely proportional to phytoplankton size.…”

Section: A1 Di/wi Satppmsmentioning

confidence: 99%

Assessing the uncertainties of model estimates of primary productivity in the tropical Pacific Ocean

Friedrichs¹,

Carr²,

Barber³

et al. 2009

Journal of Marine Systems

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Depth-integrated primary productivity (PP) estimates obtained from satellite ocean color-based models (SatPPMs) and those generated from biogeochemical ocean general circulation models (BCGCMs) represent a key resource for biogeochemical and ecological studies at global as well as regional scales. Calibration and validation of these PP models are not straightforward, however, and comparative studies show large differences between model estimates. The goal of this paper is to compare PP estimates obtained from 30 different models (21 SatPPMs and 9 BOGCMs) to a tropical Pacific PP database consisting of similar to 1000 C-14 measurements spanning more than a decade (1983-1996). Primary findings include: skill varied significantly between models, but performance was not a function of model complexity or type (i.e. SatPPM vs. BOGCM); nearly all models underestimated the observed variance of PR specifically yielding too few low PP (< 0.2 g Cm-2 d(-1)) values; more than half of the total root-mean-squared model-data differences associated with the satellite-based PP models might be accounted for by uncertainties in the input variables and/or the PP data; and the tropical Pacific database captures a broad scale shift from low biomassnormalized productivity in the 1980s to higher biomass-normalized productivity in the 1990s, which was not successfully captured by any of the models. This latter result suggests that interdecadal and global changes will be a significant challenge for both SatPPMs and BOGCMs. Finally, average root-mean-squared differences between in situ PP data on the equator at 140 degrees W and PP estimates from the satellite-based productivity models were 58% lower than analogous values computed in a previous PP model comparison 6 years ago. The success of these types of comparison exercises is illustrated by the continual modification and improvement of the participating models and the resulting increase in model skill. (C) 2008 Elsevier BY. All rights reserved

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Section: A1 Di/wi Satppmsmentioning

confidence: 99%

Assessing the uncertainties of model estimates of primary productivity in the tropical Pacific Ocean

Friedrichs¹,

Carr²,

Barber³

et al. 2009

Journal of Marine Systems

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227

179

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“…The East/Japan Sea (EJS) is one of the highly productive oceanic regions in the temperate zone [Yamada et al, 2005;Ashjian et al, 2006;Lee et al, 2009]. The EJS with an area of 1.01 3 10 6 km 2 is a semienclosed marginal sea connected to the northwestern Pacific Ocean through narrow and shallow straits (i.e., Korea/ Tsushima, Tsugaru, Soya, and Tatar Straits).…”

Section: Introductionmentioning

confidence: 99%

“…The UB, located in the southwestern part of the EJS, is reportedly the most productive region among the three deep basins in the EJS based on satellite observations [Yamada et al, 2005]. A few hypotheses have been suggested as the main cause of the high primary productivity in the UB.…”

Section: Introductionmentioning

confidence: 99%

Summer primary productivity and phytoplankton community composition driven by different hydrographic structures in the East/Japan Sea and the Western Subarctic Pacific

et al. 2014

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The East/Japan Sea (EJS) is a highly productive marginal sea in the northwest Pacific, consisting of three basins (Ulleung Basin: UB, Yamato Basin: YB, and Japan Basin: JB). To find causes of the reportedly high primary productivity in summer in the EJS, especially in the UB, we measured primary productivity, phytoplankton composition, and other environmental variables. The water column was strongly stratified in the EJS compared with the Western Subarctic Pacific (WSP). Integrated primary productivity was two times higher in the EJS (612 mg C m 22 d 21 ) than in the WSP (291 mg C m 22 d 21 ). The vertical distributions of physicochemical and biological factors confirmed that production in the subsurface chlorophyll maximum layer in the study regions was an important factor regulating primary productivity within the water column. While picoplankton (<2.7 mm) dominated in the WSP, JB, and YB, micro/nanoplankton (2.7 mm) dominated in the UB. Contribution by picoplankton to total biomass and primary productivity in the UB was significantly lower than in the other regions. CHEMTAX analysis using marker pigments showed that diverse phytoplankton groups inhabited the study regions. Cluster and canonical correspondence analyses showed high correlation between the spatial variation in phytoplankton assemblages with the water mass properties mainly represented by water temperature and nitrate concentration. Overall, our results suggest that the hydrographic structure of water column in the study region is an important controlling factor of the biomass and productivity of phytoplankton as well as their diversity in size and taxonomic groups.

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“…1). Compared to the other two basins, the surface waters of the Ulleung Basin (UB) are characterized by higher phytoplankton biomass and primary production (Yamada et al, 2005;Yoo and Park, 2009), which is associated with coastal upwelling (Hyun et al, 2009a). The enhanced biological production in the euphotic zone of the UB is responsible for the high C org content (> 2.5 % wt) in the sediment, and the highest rates of C org oxidation compared to other deep-sea sediments with similar depth range (Lee et al, 2008;Hyun et al, 2010).…”

mentioning

confidence: 99%

Manganese and iron reduction dominate organic carbon oxidation in surface sediments of the deep Ulleung Basin, East Sea

et al. 2017

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Abstract. Rates and pathways of benthic organic carbon (C org ) oxidation were investigated in surface sediments of the Ulleung Basin (UB) characterized by high C org contents (> 2.5 %, dry wt.) and very high contents of Mn oxides (> 200 µmol cm −3 ) and Fe oxides (up to 100 µmol cm −3 ). The combination of geochemical analyses and independently executed metabolic rate measurements revealed that Mn and Fe reduction were the dominant C org oxidation pathways in the center of the UB, comprising 45 and 20 % of total C org oxidation, respectively. By contrast, sulfate reduction was the dominant C org oxidation pathway, accounting for 50 % of total C org mineralization in sediments of the continental slope. The relative significance of each C org oxidation pathway matched the depth distribution of the respective electron acceptors. The relative importance of Mn reduction for C org oxidation displays saturation kinetics with respect to Mn oxide content with a low half-saturation value of 8.6 µmol cm −3 , which further implies that Mn reduction can be a dominant C org oxidation process even in sediments with lower MnO 2 content as known from several other locations. This is the first report of a high contribution of manganese reduction to C org oxidation in offshore sediments on the Asian margin. The high manganese oxide content in the surface sediment in the central UB was maintained by an extreme degree of recycling, with each Mn atom on average being reoxidized ∼ 3800 times before permanent burial. This is the highest degree of recycling so far reported for Mn-rich sediments, and it appears linked to the high benthic mineralization rates resulting from the high C org content that indicate the UB as a biogeochemical hotspot for turnover of organic matter and nutrient regeneration.

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Spatial and Temporal Variability of Satellite Primary Production in the Japan Sea from 1998 to 2002

Cited by 108 publications

References 16 publications

Assessing the uncertainties of model estimates of primary productivity in the tropical Pacific Ocean

Assessing the uncertainties of model estimates of primary productivity in the tropical Pacific Ocean

Summer primary productivity and phytoplankton community composition driven by different hydrographic structures in the East/Japan Sea and the Western Subarctic Pacific

Manganese and iron reduction dominate organic carbon oxidation in surface sediments of the deep Ulleung Basin, East Sea

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