scholarly journals Maritime Aerosol Optical and Microphysical Properties in the South China Sea Under Multi-source Influence

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chi Zhang ◽  
Hua Xu ◽  
Zhengqiang Li ◽  
Yisong Xie ◽  
Donghui Li
Keyword(s):  
South China Sea ◽  
South China ◽  
Volume Concentration ◽  
The South China Sea ◽  
Skewed Distribution ◽  
The South ◽  
China Sea ◽  
Microphysical Properties ◽  
Wide Range ◽  
Fine Mode

AbstractThe South China Sea hosts a wide range of aerosol pollutants with the uneven development of socio-economic and complicated meteorology system. To fill the gap of the maritime aerosol characteristics over the sea, we selected the multi-year ground-based measurements of Taiping Site and Dongsha Site to investigate the optical and microphysical properties. In Taiping, the vast majority of aerosol optical depths (AODs) are less than 0.2, but that of Dongsha shows the wider distribution of AODs from 0 to 0.6. Angstrom Exponent frequency distribution in Taiping peaks at the range of 0.75–1.25 but that has the left-skewed distribution in Taiping Island. Moreover, there is a variation in the coarse-mode volume concentration in Taiping Island but less variation in the fine mode. The seasonal maritime aerosol properties of Taiping and Dongsha have been analyzed that can be employed as a maritime look up table (LUT) kernel in coupled atmospheric retrieval and correction algorithms.

scholarly journals DISTRIBUTION OF GASES IN BOTTOM SEDIMENTS OF THE SOUTHWESTERN SUB-BASIN OF THE SOUTH CHINA SEA (BIEN DONG)

2021 ◽  
pp. 67-77
Author(s):  
Le Duc Luong ◽  
◽  
A.I. Obzhirov ◽  
Nguyen Hoang ◽  
R.B. Shakirov ◽  
...  
Keyword(s):  
South China Sea ◽  
Bottom Sediments ◽  
South China ◽  
The South China Sea ◽  
Background Concentration ◽  
Silty Clay ◽  
The South ◽  
Hydrocarbon Gases ◽  
China Sea ◽  
Wide Range

For the first time, this paper presents the distribution of gases (CO2, hydrocarbon C1-C4, H2, He) in 39 gas samples in bottom sediments from 19 gravity cores located in the southwestern sub-basin of the South China Sea (known as Bien Dong). The surface sediments in the studied area are mostly silty clay. In general, the concentration of methane varies in a wide range of 0.5–440 ppm. Anomalous values of methane were detected at many locations along the slope area of the southwest sub-basin of the South China Sea. The value of 2.2 ppm could be considered as a background concentration of methane in the studied region. The presence of a large-scale degassing zone of methane in the studied area was proposed. Besides, heavy hydrocarbon gases (ethylene, ethane, propane, and butane) were also determined with the highest values up to 70 ppm, 124 ppm, and 50 ppm for ethylene, ethane and propane, respectively. In addition, data of carbon dioxide, hydro and helium suggest some anomalous values of H2 up to 56.7 ppm.

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