scholarly journals First Concurrent Measurement of Primary Production in the Yellow Sea, the South Sea of Korea, and the East/Japan Sea, 2018

2021 ◽  
Vol 9 (11) ◽  
pp. 1237
Author(s):  
Hyo-Keun Jang ◽  
Seok-Hyun Youn ◽  
Huitae Joo ◽  
Yejin Kim ◽  
Jae-Joong Kang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Environmental Changes ◽  
Japan Sea ◽  
The Yellow Sea ◽  
Current Status ◽  
15N Tracer ◽  
The South ◽  
Negative Effects ◽  
Small Phytoplankton ◽  
South Sea

Dramatic environmental changes have been recently reported in the Yellow Sea (YS), the South Sea of Korea (SS), and the East/Japan Sea (EJS), but little information on the regional primary productions is currently available. Using the 13C-15N tracer method, we measured primary productions in the YS, the SS, and the EJS for the first time in 2018 to understand the current status of marine ecosystems in the three distinct seas. The mean daily primary productions during the observation period ranged from 25.8 to 607.5 mg C m−2 d−1 in the YS, 68.5 to 487.3 mg C m−2 d−1 in the SS, and 106.4 to 490.5 mg C m−2 d−1 in the EJS, respectively. In comparison with previous studies, significantly lower (t-test, p < 0.05) spring and summer productions and consequently lower annual primary productions were observed in this study. Based on PCA analysis, we found that small-sized (pico- and nano-) phytoplankton had strongly negative effects on the primary productions. Their ecological roles should be further investigated in the YS, the SS, and the EJS under warming ocean conditions within small phytoplankton-dominated ecosystems.

scholarly journals Dynamics of a Tidal Current System in a Marginal Sea: A Case Study of the Yellow Sea, China

2020 ◽  
Vol 7 ◽  
Author(s):  
Qian Zhang ◽  
Min Su ◽  
Peng Yao ◽  
Yongping Chen ◽  
Marcel J. F. Stive ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Tidal Current ◽  
Current System ◽  
Tidal Wave ◽  
The Yellow Sea ◽  
Open Boundary ◽  
Sand Ridge ◽  
South Yellow Sea ◽  
The South ◽  
The South Yellow Sea

Tidal currents belong to the main driving forces shaping the bathymetry of marginal seas. A globally unique radial sand ridge field exists in the South Yellow Sea off the central Jiangsu coast, China. Its formation is related to the distinctive “radial tidal current” pattern at that location. A generally accepted hypothesis is that the “radial tidal current” is a consequence of the interference between the northern amphidromic tidal wave system and the southern incoming tidal wave. In this study, a schematized numerical tidal model was designed to investigate the tidal current system and the factors of influence in the South Yellow Sea. Concepts of the tidal current amphidromic point (CAP) and the tidal current inclination angle are utilized to analyze the inherent structure of the tidal current system. By conducting a series of numerical experiments, it is found that the Poincaré modes are necessary for the existence of “radial tidal current,” and the e-folding decay length should be smaller than the basin length. In the Yellow Sea, cross-basin phase differences due to lateral depth differences as well as open boundary conditions favor the emergence of the “radial tidal current.” Further analyses indicate that the CAP system (i.e., the co-inclination lines, the CAPs, and the tidal ellipticity) deepens the understanding on the dynamic structure of a tidal current system, and therefore, it deserves more attention in future studies.

Population abundance and body size of Calanus sinicus in marginal habitats in the coastal seas of south-eastern Hong Kong

2012 ◽  
Vol 93 (1) ◽  
pp. 135-142 ◽  
Author(s):  
G.-T. Zhang ◽  
C.K. Wong
Keyword(s):  
Hong Kong ◽  
Yellow Sea ◽  
Local Population ◽  
The Yellow Sea ◽  
Rapid Decline ◽  
The South ◽  
Calanus Sinicus ◽  
China Sea ◽  
The North ◽  
Chinese Coast

The species range of Calanus sinicus along the Chinese coast extends from the Bohai Sea and the Yellow Sea in the north to the northern part of the South China Sea in the south. The subtropical seas along the southern coast of China mark the southern edge of the range of C. sinicus. In coastal seas off eastern Hong Kong, C. sinicus appears first in December, but densities comparable to those in the Yellow Sea and the East China Sea are reached only in January and February when temperature is <15°C. Density decreases in March as temperature increases. No individuals remain after May when temperature is >25°C. The average prosome length of females collected in February is comparable to that of females from the Yellow Sea, but females collected after mid-March are smaller than the smallest females from the Yellow Sea. Reproduction occurred mainly between January and March. Rapid decline of the population in April and the absence of a summer population suggest that the local population is derived from individuals advected from the north by ocean currents. Eggs produced locally probably did not hatch or develop into adults.

Environmental changes and the responses of the ecosystems of the Yellow Sea during 1976–2000

2005 ◽  
Vol 55 (3-4) ◽  
pp. 223-234 ◽  
Author(s):  
C. Lin ◽  
X. Ning ◽  
J. Su ◽  
Y. Lin ◽  
B. Xu
Keyword(s):  
Yellow Sea ◽  
Environmental Changes ◽  
The Yellow Sea

scholarly journals Taehwa Research Forest: a receptor site for severe domestic pollution events in Korea during 2016

2019 ◽  
Vol 19 (7) ◽  
pp. 5051-5067 ◽  
Author(s):  
John T. Sullivan ◽  
Thomas J. McGee ◽  
Ryan M. Stauffer ◽  
Anne M. Thompson ◽  
Andrew Weinheimer ◽  
...  
Keyword(s):  
Rural Communities ◽  
Yellow Sea ◽  
Eastern China ◽  
Receptor Site ◽  
The Yellow Sea ◽  
Pollution Transport ◽  
Negative Effects ◽  
Meteorological Forcing ◽  
Time Space ◽  
Pollution Events

Abstract. During the May–June 2016 International Cooperative Air Quality Field Study in Korea (KORUS-AQ), light synoptic meteorological forcing facilitated Seoul metropolitan pollution outflow to reach the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two of these severe pollution events are thoroughly examined. The first, occurring on 17 May 2016, tracks transboundary pollution transport exiting eastern China and the Yellow Sea, traversing the Seoul Metropolitan Area (SMA), and then reaching TRF in the afternoon hours with severely polluted conditions. This case study indicates that although outflow from China and the Yellow Sea were elevated with respect to chemically unperturbed conditions, the regulatory exceedance at TRF was directly linked in time, space, and altitude to urban Seoul emissions. The second case studied, which occurred on 9 June 2016, reveals that increased levels of biogenic emissions, in combination with amplified urban emissions, were associated with severe levels of pollution and a regulatory exceedance at TRF. In summary, domestic emissions may be causing more pollution than by transboundary pathways, which have been historically believed to be the major source of air pollution in South Korea. The case studies are assessed with multiple aircraft, model (photochemical and meteorological) simulations, in situ chemical sampling, and extensive ground-based profiling at TRF. These observations clearly identify TRF and the surrounding rural communities as receptor sites for severe pollution events associated with Seoul outflow, which will result in long-term negative effects to both human health and agriculture in the affected areas.

scholarly journals Settlement and Recruitment Potential of Four Invasive and One Indigenous Barnacle Species in South Korea and Their Future

2021 ◽  
Vol 13 (2) ◽  
pp. 634
Author(s):  
Michael Dadole Ubagan ◽  
Yun-Sik Lee ◽  
Taekjun Lee ◽  
Jinsol Hong ◽  
Il Hoi Kim ◽  
...  
Keyword(s):  
Invasive Species ◽  
Yellow Sea ◽  
Environmental Changes ◽  
East Sea ◽  
The Yellow Sea ◽  
Indigenous Species ◽  
Korea Strait ◽  
Barnacle Species ◽  
The Relationship

Invasion by nonindigenous species is a major threat to marine ecosystems. In this study, the distribution and occupied area (as a percentage) of four invasive barnacle species (Amphibalanus amphitrite, Amphibalanus eburneus, Amphibalanus improvisus, Perforatus perforatus), and one indigenous (Balanus trigonus) barnacle species in 13 ports in three Korean seas (Yellow Sea, Korea Strait, and East Sea) were investigated. The average ratio for all five species was 11.17% in summer and 7.59% in winter, indicating a higher occupancy in summer. B. trigonus, which is an indigenous species, was found on all ports, except for one (IC). Of the invasive species, A. amphitrite was found mainly in the Yellow Sea, A. improvisus in the Korea Strait, and A. eburneus along with P. perforatus were found in the East Sea. From nonmetric multidimensional scaling (NMDS) analysis, six parameters related to water temperature and salinity were found to be significantly correlated with the distribution and occupancy status of these five barnacle species. Using the six parameters as independent variables, random forest (RF) models were developed. Based on these models, the predicted future dominant invasive species were A. improvisus and A. amphitrite in the Yellow Sea and P. perforatus in the East Sea and Korea Strait. This study suggests that long-term monitoring of invasive species is crucial, and that determining the relationship between the results of monitoring and environmental variables can be helpful in predicting the damage caused by invasive species resulting from environmental changes.

Interactions between selected microalgae and microscopic propagules of Ulva prolifera

2017 ◽  
Vol 98 (7) ◽  
pp. 1571-1580 ◽  
Author(s):  
Qing Liu ◽  
Tian Yan ◽  
Rencheng Yu ◽  
Qingchun Zhang ◽  
Mingjiang Zhou
Keyword(s):  
Yellow Sea ◽  
Large Scale ◽  
Critical Role ◽  
Ulva Prolifera ◽  
Alexandrium Tamarense ◽  
The Yellow Sea ◽  
Negative Effects ◽  
Green Tides ◽  
Complex Interactions ◽  
Potential Interactions

Large-scale green tides of Ulva prolifera occur repeatedly in the Yellow Sea, and the microscopic propagules of U. prolifera play a critical role during the development of green tides. Ulva prolifera propagules and microalgae are both present in seawater and share similar niches, but their potential interactions are poorly understood. Nine species of microalgae were selected to study their interactions with the propagules of U. prolifera (gametes) in laboratory. The results showed that settlement of gametes could be inhibited by some microalgae, such as Alexandrium tamarense, Prorocentrum lima and Karenia mikimotoi, at the cell density of blooming (102–103 cells ml–1). Inversely, the germlings germinated from U. prolifera gametes had negative effects on the microalgae, the inhibition rate ranged from 28 to 66%. Our results demonstrated the complex interactions between microalgae and propagules of green algae, which may influence the formation of green tides and their ecological consequences in the Yellow Sea.

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