scholarly journals The Yellow Sea Warm Current flushes the Bohai Sea microbial community in winter

2020 ◽  
Vol 71 (12) ◽  
pp. 1616
Author(s):  
Caixia Wang ◽  
Yibo Wang ◽  
Pengyuan Liu ◽  
Lin Wu ◽  
James S. Paterson ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Bohai Sea ◽  
Heterotrophic Bacteria ◽  
Cold Water ◽  
Sea Water ◽  
The Yellow Sea ◽  
Effect Of Temperature ◽  
Yellow Sea Warm Current ◽  
Warm Current ◽  
The Bohai Sea

The effect of the Yellow Sea Warm Current (YSWC) on virio- and bacterioplankton communities in the Bohai Sea is unknown. In this study, the composition and dynamic changes of virio- and bacterioplankton at the entrance of the Bohai Sea were measured to determine the influence of the YSWC on those communities and vice versa. In the Bohai Strait, there were east to west gradients of water chemistry and hydrology. The turbulent mixing between the deep north-western ‘warm’ current, which is 9°C, and the cold, nutrient-rich Bohai Sea water at 7–8°C appears to stimulate the abundance of both viruses and heterotrophic bacteria, with numbers at the junction of ‘warm’ and cold water being almost 10-fold greater than in the low-thermohaline areas, and peaking where the temperature is the highest. The average viral and bacterial abundances in the north-eastern area are much higher than in the south-western area. It proved that the YSWC entered the Bohai Sea with poor biomass and exited with rich biomass, which, in turn, enriches the Yellow Sea microbial loop. Our results showed the dramatic effect of temperature rise and increasing eutrophication on microbial abundance and marine microbial communities.

scholarly journals Remote Sensing Observations of the Winter Yellow Sea Warm Current Invasion into the Bohai Sea, China

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Jie Guo ◽  
Hua Zhang ◽  
Tingwei Cui ◽  
Yijun He ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Bohai Sea ◽  
Chlorophyll Concentration ◽  
Surface Wind ◽  
Sea Surface ◽  
The Yellow Sea ◽  
Yellow Sea Warm Current ◽  
Warm Current ◽  
The Bohai Sea ◽  
Sea Surface Wind

Using ASCAT, QuikSCAT, and MODIS data, we analyzed the sea surface wind field, temperature, salinity, and chlorophyll concentrations in the mixed zone between the Bohai Sea and Yellow Sea in the winter (the period of winter 2013 included December 2013 and January-February 2014) from 2002 to 2013. We found that the intrusion of the Yellow Sea Warm Current into the Bohai Sea occurred three times in the winters of 2007 (strongest), 2004, and 2013 (weakest) during this 12-year period. We present detailed validation of the intrusion in 2013. This study shows that the intrusion of the Yellow Sea Warm Current into the Bohai Sea occurred when the wind speed, sea surface temperature, and salinity were above (or close to) the multiyear average and the chlorophyll concentration was less than the multiyear average.

scholarly journals Nitric oxide (NO) in the Bohai Sea and the Yellow Sea

2019 ◽  
Vol 16 (22) ◽  
pp. 4485-4496 ◽  
Author(s):  
Ye Tian ◽  
Chao Xue ◽  
Chun-Ying Liu ◽  
Gui-Peng Yang ◽  
Pei-Feng Li ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Surface Layer ◽  
Yellow Sea ◽  
Bohai Sea ◽  
Limit Of Detection ◽  
Bottom Layer ◽  
The Yellow Sea ◽  
The Bohai Sea ◽  
Significant Difference ◽  
Average Flux

Abstract. Nitric oxide (NO) is a short-lived compound of the marine nitrogen cycle; however, our knowledge about its oceanic distribution and turnover is rudimentary. Here we present the measurements of dissolved NO in the surface and bottom layers at 75 stations in the Bohai Sea (BS) and the Yellow Sea (YS) in June 2011. Moreover, NO photoproduction rates were determined at 27 stations in both seas. The NO concentrations in the surface and bottom layers were highly variable and ranged from below the limit of detection (i.e., 32 pmol L−1) to 616 pmol L−1 in the surface layer and 482 pmol L−1 in the bottom layer. There was no significant difference (p>0.05) between the mean NO concentrations in the surface (186±108 pmol L−1) and bottom (174±123 pmol L−1) layers. A decreasing trend of NO in bottom-layer concentrations with salinity indicates a NO input by submarine groundwater discharge. NO in the surface layer was supersaturated at all stations during both day and night and therefore the BS and YS were a persistent source of NO to the atmosphere at the time of our measurements. The average flux was about 4.5×10-16 mol cm−2 s−1 and the flux showed significant positive relationship with the wind speed. The accumulation of NO during daytime was a result of photochemical production, and photoproduction rates were correlated to illuminance. The persistent nighttime NO supersaturation pointed to an unidentified NO dark production. NO sea-to-air flux densities were much lower than the NO photoproduction rates. Therefore, we conclude that the bulk of the NO produced in the mixed layer was rapidly consumed before its release to the atmosphere.

scholarly journals Characterization of Bacterial Communities in Bioaerosols over Northern Chinese Marginal Seas and the Northwestern Pacific Ocean in Spring

2019 ◽  
Vol 58 (4) ◽  
pp. 903-917 ◽  
Author(s):  
Manman Ma ◽  
Yu Zhen ◽  
Tiezhu Mi
Keyword(s):  
Pacific Ocean ◽  
Yellow Sea ◽  
Bacterial Communities ◽  
Bohai Sea ◽  
The Yellow Sea ◽  
Northwestern Pacific ◽  
Particle Sizes ◽  
Marine Aerosols ◽  
Northwestern Pacific Ocean ◽  
The Bohai Sea

AbstractStudies of the community structures of bacteria in marine aerosols of different particle sizes have not been reported. Aerosol samples were collected using a six-stage bioaerosol sampler over the Bohai Sea, the Yellow Sea, and northwestern Pacific Ocean in the spring of 2014. The diversity and composition of these samples were investigated by Illumina high-throughput sequencing, and 130 genera were detected in all of the samples; the most abundant bacterial genus was Bacteroides, followed by Prevotella and Megamonas. The Chao1 and Shannon diversity indices ranged from 193 to 1044 and from 5.44 to 8.33, respectively. The bacterial community structure in coarse particles (diameter larger than 2.1 μm) was more complex and diverse than that in fine particles (diameter less than 2.1 μm) in marine bioaerosols from over the Yellow Sea and northwestern Pacific Ocean, while the opposite trend was observed for samples collected over the Bohai Sea. Although we were sampling over marine regions, the sources of the bioaerosols were mostly continental. Temperature and wind speed significantly influenced the bacterial communities in marine aerosols of different particle sizes. There may be a bacterial background in the atmosphere in the form of several dominant taxa, and the bacterial communities are likely mixed constantly during transmission.

Observational evidence of the Yellow Sea warm current

2010 ◽  
Vol 28 (3) ◽  
pp. 677-683 ◽  
Author(s):  
Fei Yu ◽  
Zhixin Zhang ◽  
Xinyuan Diao ◽  
Jingsong Guo
Keyword(s):  
Yellow Sea ◽  
Observational Evidence ◽  
The Yellow Sea ◽  
Yellow Sea Warm Current ◽  
Warm Current

Effect of coastal-trapped waves on the synoptic variations of the Yellow Sea Warm Current during winter

2018 ◽  
Vol 167 ◽  
pp. 14-31 ◽  
Author(s):  
Yang Ding ◽  
Xianwen Bao ◽  
Zhigang Yao ◽  
Dehai Song ◽  
Jun Song ◽  
...  
Keyword(s):  
Yellow Sea ◽  
The Yellow Sea ◽  
Trapped Waves ◽  
Yellow Sea Warm Current ◽  
Warm Current ◽  
Coastal Trapped Waves

scholarly journals The silica-carbon biogeochemical cycle in the Bohai Sea and its responses to the changing terrestrial loadings

2016 ◽  
Author(s):  
Jun Liu ◽  
Lex Bouwman ◽  
Jiaye Zang ◽  
Chenying Zhao ◽  
Xiaochen Liu ◽  
...  
Keyword(s):  
Primary Production ◽  
Water Column ◽  
Yellow Sea ◽  
Bohai Sea ◽  
Critical Role ◽  
The Yellow Sea ◽  
Organic C ◽  
Riverine Input ◽  
The Bohai Sea ◽  
River Loads

Abstract. Silicon (Si) and carbon (C) play key roles in the river and marine biogeochemistry. The Si and C budgets for the Bohai Sea were established on the basis of measurements at a range of stations and additional data from the literature. The results show that the spatial distributions of reactive Si and organic C (OC) in the water column are largely affected by the riverine input, primary production and export to the Yellow Sea. Biogenic silica (BSi) and total OC in sediments are mainly from marine primary production. The major supply of dissolved silicate (DSi) comes from benthic diffusion, riverine input alone accounts for 17 % of reactive Si inputs to the Bohai Sea; the dominant DSi removal from the water column is diatom uptake, followed by sedimentation. Rivers contribute 47 % of exogenous OC inputs to the Bohai Sea; the dominant outputs of OC are sedimentation and export to the Yellow Sea. The net burial of BSi and OC represent 3.3 % and 1.0 % of total primary production, respectively. Primary production has increased by 10 % since 2002 as a result of increased river loads of DSi and BSi. Our findings underline the critical role of riverine Si supply in primary production in coastal marine ecosystems.

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