scholarly journals Unusual Fish Assemblages Associated with Environmental Changes in the East China Sea in February and March 2017

2021 ◽  
Vol 13 (9) ◽  
pp. 1768
Author(s):  
Wenxiang Ding ◽  
Caiyun Zhang ◽  
Jianyu Hu ◽  
Shaoping Shang
Keyword(s):  
Chlorophyll A ◽  
East China Sea ◽  
Ocean Circulation ◽  
Environmental Changes ◽  
Fish Assemblages ◽  
The Yellow Sea ◽  
East China ◽  
Large Fish ◽  
The East China Sea ◽  
China Sea

Two large fish assemblages were recorded in the overwintering fishing grounds of the East China Sea in February and March 2017. In this study, available time series of satellite-derived sea surface temperature, wind, chlorophyll a, and reanalysis data were used to explore the relationships between the observed large fish aggregations and environmental factors. The bottom waters of the fishing grounds were abnormally warm in winter 2017, and then experienced significant cooling due to the eastward movement of the Yellow Sea Cold Current, which was driven by the increased northwesterly wind from January to mid-March 2017. Fishing areas in the affected region, including No. 1891, which was abnormally warm, and No. 1592, which had a strong thermal front and high chlorophyll a concentration, might have provided suitable environments for the warm-temperature fish, resulting in the observed large fish assemblages. The abnormal temperature changes between winter and early spring 2017 may have been associated with changes in local ocean circulation.

Distribution and influencing factors of dissolved manganese in the Yellow Sea and the East China Sea

2021 ◽  
pp. 104002
Author(s):  
Yuan Zhang ◽  
Lei Li ◽  
Jingling Ren ◽  
Huijun He ◽  
Ruifeng Zhang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
East China Sea ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea

scholarly journals Summer and winter living coccolithophores in the Yellow Sea and the East China Sea

2014 ◽  
Vol 11 (3) ◽  
pp. 779-806 ◽  
Author(s):  
J. Sun ◽  
X. Y. Gu ◽  
Y. Y. Feng ◽  
S. F. Jin ◽  
W. S. Jiang ◽  
...  
Keyword(s):  
Surface Layer ◽  
Environmental Factors ◽  
East China Sea ◽  
Correspondence Analysis ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Living Coccolithophores

Abstract. This paper describes the distribution of living coccolithophores (LCs) in the Yellow Sea and the East China Sea in summer and winter, and its relationship with environmental factors by canonical correspondence analysis (CCA). We carried out a series of investigations on LCs distribution in the Yellow Sea and the East China Sea in July and December 2011. 210 samples from different depths were collected from 44 stations in summer and 217 samples were collected from 45 stations in winter. Totally 20 taxa belonging to coccolithophyceae were identified using a polarized microscope at the 1000 × magnification. The dominant species of the two seasons were Gephyrocapsa oceanica, Emiliania huxleyi, Helicosphaera carteri, and Algirosphaera robusta. In summer the abundance of coccolithophore cells and coccoliths ranged 0–176.40 cells mL−1, and 0–2144.98 coccoliths mL−1, with the average values of 8.45 cells mL−1, and 265.42 coccoliths mL−1, respectively. And in winter the abundance of cells and coccoliths ranged 0–71.66 cells mL−1, and 0–4698.99 coccoliths mL−1, with the average values of 13.91 cells mL−1 and 872.56 coccoliths mL−1, respectively. In summer, the LCs in surface layer were mainly observed on the coastal belt and southern part of the survey area. In winter, the LCs in surface layer had high value in the continental shelf area of section P. The comparison among section A, section F, section P and section E indicated lower species diversity and less abundance in the Yellow Sea than those in the East China Sea in both seasons. Temperature and the nitrate concentration may be the major environmental factors controlling the distribution and species composition of LCs in the studying area based on CCA. Abbreviations: LCs: Living Coccolithophores; CCA: canonical correspondence analysis; DCM: Deep Chlorophyll Maximum

Impacts of Binary-interacted Typhoons Tembin and Bolaven in 2012 on Surges and Waves over the East China Sea

2020 ◽  
Author(s):  
Jie Yang ◽  
Yong Li ◽  
Meixiang Chen
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
East China Sea ◽  
Coastal Hazards ◽  
The Yellow Sea ◽  
East China ◽  
Altimeter Data ◽  
The East China Sea ◽  
China Sea ◽  
Hurricane Wind

<p>Typhoon-induced storm surges and waves are highly related with typhoon track and associated wind stresses and atmospheric pressures at sea surface. The effects of binary interaction may alter typhoon tracks and even forward speed, which might influence waves and surge heights in the ocean. In the present study, we execute a series of numerical experiments to investigate how isolated and binary typhoons would impact the ocean waves and generated surges offshore and nearshore. The responses of binary typhoons to sea level rise and land subsidence are also discussed. The Typhoon Tembin and Typhoon Bolaven influenced the East China Sea with equivalent intensity of tropical storm and Category 2, respectively, on the Saffir–Simpson hurricane wind scale. The Weather Research and Forecasting (WRF) model is utilized to hindcast the layered wind and atmospheric pressure fields above sea/land surface. Two synthetic scenarios isolating these individual typhoons are designed to investigate the potential impacts of the binary-interacted typhoons. By coupling with the SCHISM–WWMIII modelling system, the corresponding surge–tide–wave processes are solved and validated with measurements at tidal gauge and wave buoy stations. At the same time, The spatial-varied future relative sea level rise (RSLR) by the end of the century is projected from satellite altimeter data-based sea level analysis and is adjusted for the influence of the Glacial Isostatic Adjustment (GIA) using the ICE-6G/VM5a model. The results indicate that the surge and wave heights induced by these two typhoons were not exacerbated significantly, as the hours influencing the Yellow Sea by Typhoon Tembin were about 30 hours later than Typhoon Bolaven. We also present the spatial distribution of nonlinear responses of storm surge induced extreme sea levels to RSLR, implicating the regions of exacerbation and attenuation, respectively, due to future sea level trend. The present study helps identifying distribution patterns by binary-interacted typhoons and enhancing assessment accuracy of potential coastal hazards and flood risk.</p>

The genetic divergence of Oratosquilla oratoria between the East China Sea and Yellow Sea: physical barrier and possible local adaptation

2017 ◽  
Vol 99 (3) ◽  
pp. 631-638
Author(s):  
Wenbin Zhu ◽  
Xinwei Du ◽  
Zhiqiang Han ◽  
Hanxiang Xu
Keyword(s):  
Local Adaptation ◽  
East China Sea ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
Coi Gene ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Oratosquilla Oratoria ◽  
Genetic Break

In order to confirm the genetic relationship between the Yellow Sea and East China Sea populations of mantis shrimps Oratosquilla oratoria, fragments of mitochondrial DNA COI gene samples were analysed. A total of 212 individuals from nine localities in the East China Sea and Yellow Sea were collected and 108 haplotypes were detected. Neighbour-joining analysis revealed a complete genetic break between the Yellow Sea and East China Sea, which was consistent with the previous mtDNA 16S rRNA. Pleistocene isolation and the current physical barrier were responsible for the complete genetic break between the East China Sea and Yellow Sea. Furthermore, local adaptation in the COI gene may also be contributed to by the genetic differentiation between the populations of the Yellow Sea and East China. The different Ka/Ks ratios between the two clades may reflect different selection pressures and local adaptation on the fragment of COI gene.

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