scholarly journals Contribution of ocean current to the increase in N abundance in the Northwestern Pacific marginal seas

2013 ◽  
Vol 40 (1) ◽  
pp. 143-148 ◽  
Author(s):  
Seung-Kyu Kim ◽  
Kyung-Il Chang ◽  
Bongguk Kim ◽  
Yang-Ki Cho
Keyword(s):  
Ocean Current ◽  
Northwestern Pacific ◽  
Marginal Seas

scholarly journals Long-term ocean acidification trends in coastal waters around Japan

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hiroshi Ishida ◽  
Ryosuke S. Isono ◽  
Jun Kita ◽  
Yutaka W. Watanabe
Keyword(s):  
Pacific Ocean ◽  
Ocean Acidification ◽  
Sea Of Japan ◽  
Ocean Current ◽  
The Sea Of Japan ◽  
Marginal Seas ◽  
The Pacific ◽  
Activity Measurements ◽  
The Pacific Ocean

AbstractThis study examines long-term ocean pH data to evaluate ocean acidification (OA) trends at two coastal research institutions located on the Sea of Japan and the Pacific Ocean. These laboratories are located away from the influences of large rivers and major industrial activity. Measurements were performed daily for the past 30 years (1980s–2010s). The average annual ocean pH for both sites showed generally negative trends. These trends were – 0.0032 and – 0.0068 year–1 (p < 0.001) at the Sea of Japan and Pacific Ocean sites, respectively. The trends were superimposed onto approximately 10-year oscillations, which appear to synchronize with the ocean current periodicity. At the Sea of Japan site, the ocean pH in the summer was higher, and the rate of OA was higher than during other seasons. Our results suggest that seasonality and ocean currents influence OA in the coastal areas of open oceans and can affect the coastal regions of marginal seas.

scholarly journals Seasonal Sea Surface Temperature Asymmetry in the Northwestern Pacific Marginal Seas

2015 ◽  
Vol 26 (3) ◽  
pp. 331 ◽  
Author(s):  
Hyeonyeong Kwak ◽  
Yang-Ki Cho ◽  
Gwang-Ho Seo ◽  
Yong-Jin Tak ◽  
Hyo-Seok Park ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Sea Surface ◽  
Northwestern Pacific ◽  
Marginal Seas ◽  
Temperature Asymmetry

Stable Isotope and Lithologic Evidence of Late-Glacial and Holocene Oceanography of the Northwestern Pacific and Its Marginal Seas

1996 ◽  
Vol 46 (3) ◽  
pp. 230-250 ◽  
Author(s):  
Sergei A. Gorbarenko
Keyword(s):  
Bering Sea ◽  
Planktonic Foraminifera ◽  
Late Glacial ◽  
Northwestern Pacific ◽  
Intermediate Water ◽  
Regional Environment ◽  
The Holocene ◽  
Marginal Seas ◽  
The North ◽  
The Bering Sea

Stable isotopes, geochemical, lithological, and micropaleontological results from cores from the far northwest (FNW) Pacific and the Okhotsk and Bering seas are used to reconstruct the regional environment for the last glaciation, the deglacial transition, and the Holocene. δ18O records of planktonic foraminifera of the region show two “light” shifts during deglacial time, provoked by the freshening of the surface water and climate warming. These north Pacific terminal events (T1ANP and T1BNP) with ages of 12,500 and 9300 yr B.P., respectively, occur almost simultaneously with two episodes of accelerated glacier melting around the North Atlantic. Along with the isotopic shifts, the CaCO3 content in regional sediments increased abruptly (1A and 1B carbonate peaks), probably due to changes of productivity and pore water chemistry of surface sediments. Organic matter and opal concentration increased during the transition (between T1ANP and T1BNP events) in the sediments of the FNW Pacific and the southern part of the Bering Sea and opal content increased in the Holocene in the Bering and Okhotsk Seas. δ13C records of cores from the Okhotsk and Bering seas and the FNW Pacific do not contradict the hypothesis of increased intermediate water formation in the region during glaciation. During deglaciation, accumulation of the coarse terrigenous component decreased in sediments of the Bering Sea and the FNW Pacific before the T1ANP event, probably as a result of rising sea level and opening of the Bering Strait.

scholarly journals The role of the isolation of the marginal seas during the Pleistocene in the genetic structure of black sea bream Acanthopagrus schlegelii (Bleeker, 1854) in the coastal waters of Japan

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11001
Author(s):  
Yutaro Yamashita ◽  
Gustavo Sanchez ◽  
Kentaro Kawai ◽  
Satoshi Tomano ◽  
Hiroki Fujita ◽  
...  
Keyword(s):  
Population Structure ◽  
Pacific Ocean ◽  
Black Sea ◽  
Coastal Waters ◽  
Sea Bream ◽  
The Black Sea ◽  
Northwestern Pacific ◽  
Marginal Seas ◽  
Coastal Marine ◽  
Japanese Waters

The black sea bream Acanthopagrus schlegelii (Bleeker, 1854) is a commercially important species in Japanese waters. Assessing its population structure is essential to ensure its sustainability. In the Northwestern Pacific, historical glacial and interglacial periods during the Pleistocene have shaped the population structure of many coastal marine fishes. However, whether these events affected the population of black sea bream remains unknown. To test this hypothesis and to assess the population structure of black sea bream, we used 1,046 sequences of the mitochondrial control region from individuals collected throughout almost the entire Japanese coastal waters and combined them with 118 sequences from populations distributed in other marginal seas of the Northwestern Pacific Ocean. As in other coastal marine fish with similar distribution, we also found evidence that the glacial refugia on the marginal seas prompted the formation of three lineages in black sea bream. These lineages present signatures of population growth that coincided with the interglacial periods of the Pleistocene. While the origin of Lineages B and C remains unclear, the higher relative frequency of Lineage A in the southernmost location suggests its origin in the South China Sea. The non-significant pairwise ΦST and AMOVA of Japanese populations and the presence of these three lineages mixed in Japanese waters; strongly suggest that these lineages are homogenized in both the Sea of Japan and the Pacific Ocean. Our results indicate that the black sea bream should be managed as a single stock in Japan until the strength of connectivity in contemporary populations is further addressed using non-coding nuclear markers.

scholarly journals Spatial heterogeneity of seasonal phytoplankton blooms in a marginal sea: physical drivers and biological responses

2019 ◽  
Author(s):  
Hongjun Song ◽  
Rubao Ji ◽  
Ming Xin ◽  
Ping Liu ◽  
Zhaohui Zhang ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
Cold Water ◽  
The Yellow Sea ◽  
Northwestern Pacific ◽  
Phytoplankton Blooms ◽  
Marginal Seas ◽  
Marginal Sea ◽  
Central Trough ◽  
Underlying Mechanisms

Abstract Satellite and in situ observations are used in this study to examine spatial heterogeneity in the timing and magnitude of phytoplankton blooms in relation to local and remote physical processes in the Yellow Sea (YS), a marginal sea in the northwestern Pacific Ocean. Satellite ocean colour data reveal that annual chlorophyll maximums vary significantly in both timing and magnitude over different subregions of the YS. Strong summer blooms were found off estuary regions, and widespread spring blooms were found in the central trough. Localized autumn and winter peaks were found in small patches around Jeju Island and in nearshore regions. A statistical analysis of in situ measurements of the western YS suggests that variability in hydrographic properties could explain most of the spatial heterogeneity observed in both bloom timing and magnitude. The spatial heterogeneity of hydrographic properties, such as stratification and nutrient availability, are controlled by a suite of physical forcings, including the extent of the YS Cold Water Mass, river discharge, warm slope water intrusion, and seasonal warming/cooling. Our results imply that the spatial heterogeneity of marginal seas must be carefully considered when assessing phytoplankton responses in the context of climate change, because of the complexity of underlying mechanisms.

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