Occurrence and dry deposition of organophosphate esters in atmospheric particles above the Bohai Sea and northern Yellow Sea, China

2021 ◽  
pp. 118831
Author(s):  
Jinhao Wu ◽  
Yufeng Zhang ◽  
Lun Song ◽  
Meng Yang ◽  
Xing Liu ◽  
...  
Keyword(s):  
Dry Deposition ◽  
Yellow Sea ◽  
Bohai Sea ◽  
Atmospheric Particles ◽  
Organophosphate Esters ◽  
The Bohai Sea ◽  
Northern Yellow Sea

Data assimilation in a coupled physical-biological model for the Bohai Sea and the Northern Yellow Sea

2008 ◽  
Vol 59 (6) ◽  
pp. 529 ◽  
Author(s):  
Qing Xu ◽  
Hui Lin ◽  
Yuguang Liu ◽  
Xianqing Lv ◽  
Yongcun Cheng
Keyword(s):  
Chlorophyll A ◽  
Annual Cycle ◽  
Yellow Sea ◽  
Bohai Sea ◽  
Biological Model ◽  
Model Parameters ◽  
The Bohai Sea ◽  
Northern Yellow Sea ◽  
Ocean Models ◽  
Adjoint Assimilation

One difficulty with coupled physical-biological ocean models is determining optimal values of poorly known model parameters. The variational adjoint assimilation method is a powerful tool for the automatic estimation of parameters. We used this method to incorporate remote-sensed chlorophyll-a data into a coupled physical-biological model developed for the Bohai Sea and the Northern Yellow Sea. A 3-D NPZD model of nutrients (N), phytoplankton (P), zooplankton (Z) and detritus (D) was coupled with a physical model, the Princeton Ocean Model. Sensitivity analysis was carried out to choose suitable control variables from the model parameters. Numerical twin experiments were then conducted to demonstrate whether the spatio-temporal resolutions of the observations were adequate for estimating values of the control variables. Finally, based on the success of the twin experiments, we included remote-sensed chlorophyll-a data in the NPZD model. With the adjoint assimilation of these chlorophyll-a data, the coupled model better describes spring and autumn phytoplankton blooms and the annual cycle of phytoplankton at the surface layer for the study area. The annual cycle of simulated surface nutrient concentrations also agreed well with field observations. The adjoint method greatly improves the modelling capability of coupled ocean models, helping us to better understand and model marine ecosystems.

Distribution of biogenic sulfur in the Bohai Sea and northern Yellow Sea and its contribution to atmospheric sulfate aerosol in the late fall

2015 ◽  
Vol 169 ◽  
pp. 23-32 ◽  
Author(s):  
Gui-Peng Yang ◽  
Sheng-Hui Zhang ◽  
Hong-Hai Zhang ◽  
Jian Yang ◽  
Chun-Ying Liu
Keyword(s):  
Yellow Sea ◽  
Bohai Sea ◽  
Sulfate Aerosol ◽  
The Bohai Sea ◽  
Late Fall ◽  
Northern Yellow Sea

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.

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