Seasonal succession of net primary productivity, particulate organic carbon export, and autotrophic community composition in the eastern Bering Sea

In recent years, the change of marine environment due to climate change and declining primary productivity have been big concerns in the East/Japan Sea, Korea. However, the main causes for the recent changes are still not revealed clearly. The particulate organic carbon (POC) to chlorophyll-a (chl-a) ratio (POC:chl-a) could be a useful indicator for ecological and physiological conditions of phytoplankton communities and thus help us to understand the recent reduction of primary productivity in the East/Japan Sea. To derive the POC in the East/Japan Sea from a satellite dataset, the new regional POC algorithm was empirically derived with in-situ measured POC concentrations. A strong positive linear relationship (R2 = 0.6579) was observed between the estimated and in-situ measured POC concentrations. Our new POC algorithm proved a better performance in the East/Japan Sea compared to the previous one for the global ocean. Based on the new algorithm, long-term POC:chl-a ratios were obtained in the entire East/Japan Sea from 2003 to 2018. The POC:chl-a showed a strong seasonal variability in the East/Japan Sea. The spring and fall blooms of phytoplankton mainly driven by the growth of large diatoms seem to be a major factor for the seasonal variability in the POC:chl-a. Our new regional POC algorithm modified for the East/Japan Sea could potentially contribute to long-term monitoring for the climate-associated ecosystem changes in the East/Japan Sea. Although the new regional POC algorithm shows a good correspondence with in-situ observed POC concentrations, the algorithm should be further improved with continuous field surveys.

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234Th-derived particulate organic carbon export in the Prydz Bay, Antarctica

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-013-2842-y ◽

2013 ◽

Vol 299 (1) ◽

pp. 621-630 ◽

Cited By ~ 2

Author(s):

Hao Ma ◽

Zhi Zeng ◽

Jianhua He ◽

Zhengbing Han ◽

Wuhui Lin ◽

...

Keyword(s):

Organic Carbon ◽

Particulate Organic Carbon ◽

Prydz Bay ◽

Carbon Export

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Research on net primary productivity and soil organic carbon pool in the coal mining area of Xuzhou

2012 Second International Workshop on Earth Observation and Remote Sensing Applications ◽

10.1109/eorsa.2012.6261136 ◽

2012 ◽

Author(s):

Kun Tan ◽

JunPeng Zhang ◽

Peijun Du

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Coal Mining ◽

Primary Productivity ◽

Net Primary Productivity ◽

Mining Area ◽

Carbon Pool ◽

Coal Mining Area ◽

Organic Carbon Pool

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Seasonal changes in heterotrophic bacteria under fast ice near Syowa station, Antarctica

Canadian Journal of Microbiology ◽

10.1139/m89-050 ◽

1989 ◽

Vol 35 (2) ◽

pp. 329-333 ◽

Cited By ~ 7

Author(s):

Hiroo Satoh ◽

Kimio Fukami ◽

Kentaroo Watanabe ◽

Eiji Takahashi

Keyword(s):

Organic Carbon ◽

Particulate Organic Carbon ◽

Seasonal Changes ◽

Heterotrophic Bacteria ◽

Seasonal Succession ◽

Austral Spring ◽

Syowa Station ◽

Colony Forming Units ◽

Algal Assemblages ◽

Fast Ice

Seasonal changes in the number of heterotrophic bacteria and the species composition of their communities were investigated in the fast ice area of Syowa station (69°00′S, 39°35′E), from May 1983 to January 1984. Numbers of heterotrophic bacteria under the fast ice began to increase in October and the maximum number of colony-forming units/mL (2.4 × 102) were obtained in late December. The changes in bacterial numbers coincided well with those of particulate organic carbon, suggesting that the growth of heterotrophic bacteria depends on the supply of particulate organic carbon from ice algal assemblages which grow rapidly at the bottom of sea ice during the austral spring. Vibrionaceans in the communities in September accounted for as much as 35% of the isolates, whereas in December, they were not detected at all. These results indicate that there is a seasonal succession in the bacterial communities between September and December.Key words: heterotrophic bacteria, vibrionaceans, fast ice, Antarctica.

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