Isotopic Composition of Gaseous Elemental Mercury in the Marine Boundary Layer of East China Sea

2018 ◽  
Author(s):  
Xuewu Fu ◽  
Xu Yang ◽  
Qingyou Tan ◽  
Lili Ming ◽  
Tian Lin ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Isotopic Composition ◽  
East China Sea ◽  
Marine Boundary Layer ◽  
Elemental Mercury ◽  
East China ◽  
Gaseous Elemental Mercury ◽  
China Sea

Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
Su Mei Liu ◽  
Xiaoyan Ning ◽  
Shuhang Dong ◽  
Guodong Song ◽  
Lingyan Wang ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
East China Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Nitrate And Nitrite

Global Concentrations of Gaseous Elemental Mercury and Reactive Gaseous Mercury in the Marine Boundary Layer

2010 ◽  
Vol 44 (19) ◽  
pp. 7425-7430 ◽  
Author(s):  
Anne L. Soerensen ◽  
Henrik Skov ◽  
Daniel J. Jacob ◽  
Britt T. Soerensen ◽  
Matthew S. Johnson
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Elemental Mercury ◽  
Gaseous Elemental Mercury ◽  
Reactive Gaseous Mercury ◽  
Gaseous Mercury

scholarly journals The effect of Kuroshio Current on nitrate dynamics in the southern East China Sea revealed by nitrate isotopic composition

2016 ◽  
Vol 121 (9) ◽  
pp. 7073-7087 ◽  
Author(s):  
Wentao Wang ◽  
Zhiming Yu ◽  
Xiuxian Song ◽  
Zaixing Wu ◽  
Yongquan Yuan ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
East China Sea ◽  
Kuroshio Current ◽  
East China ◽  
China Sea ◽  
Southern East China Sea

scholarly journals Gaseous elemental mercury depletion events observed at Cape Point during 2007–2008

2010 ◽  
Vol 10 (3) ◽  
pp. 1121-1131 ◽  
Author(s):  
E.-G. Brunke ◽  
C. Labuschagne ◽  
R. Ebinghaus ◽  
H. H. Kock ◽  
F. Slemr
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Elemental Mercury ◽  
Atmospheric Mercury ◽  
Chemical Mechanism ◽  
Polar Regions ◽  
Gaseous Elemental Mercury ◽  
Transport Distance ◽  
Gaseous Mercury ◽  
Urban Emissions

Abstract. Gaseous mercury in the marine boundary layer has been measured with a 15 min temporal resolution at the Global Atmosphere Watch station Cape Point since March 2007. The most prominent features of the data until July 2008 are the frequent occurrences of pollution (PEs) and depletion events (DEs). Both types of events originate mostly within a short transport distance (up to about 100 km), which are embedded in air masses ranging from marine background to continental. The Hg/CO emission ratios observed during the PEs are within the range reported for biomass burning and industrial/urban emissions. The depletion of gaseous mercury during the DEs is in many cases almost complete and suggests an atmospheric residence time of elemental mercury as short as a few dozens of hours, which is in contrast to the commonly used estimate of approximately 1 year. The DEs observed at Cape Point are not accompanied by simultaneous depletion of ozone which distinguishes them from the halogen driven atmospheric mercury depletion events (AMDEs) observed in Polar Regions. Nonetheless, DEs similar to those observed at Cape Point have also been observed at other places in the marine boundary layer. Additional measurements of mercury speciation and of possible mercury oxidants are hence called for to reveal the chemical mechanism of the newly observed DEs and to assess its importance on larger scales.

scholarly journals Tropospheric NO<sub>2</sub>, SO<sub>2</sub>, and HCHO over the East China Sea, using ship-based MAX-DOAS observations and comparison with OMI and OMPS satellite data

2018 ◽  
Vol 18 (20) ◽  
pp. 15387-15402 ◽  
Author(s):  
Wei Tan ◽  
Cheng Liu ◽  
Shanshan Wang ◽  
Chengzhi Xing ◽  
Wenjing Su ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Optical Absorption ◽  
East China Sea ◽  
Absorption Spectroscopy ◽  
Marine Boundary Layer ◽  
Trace Gases ◽  
Differential Optical Absorption Spectroscopy ◽  
East China ◽  
Optical Absorption Spectroscopy ◽  
The East China Sea

Abstract. In this study, ship-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements were performed in the East China Sea (ECS) area in June 2017. The tropospheric slant column densities (SCDs) of nitrogen dioxide (NO2), sulfur dioxide (SO2), and formaldehyde (HCHO) were retrieved from the measured spectra using the differential optical absorption spectroscopy (DOAS) technique. Using the simple geometric approach, the SCDs of different trace gases observed at a 15∘ elevation angle were adopted to convert into tropospheric vertical column densities (VCDs). During this campaign, the averaged VCDs of NO2, SO2, and HCHO in the marine environment over the ECS area are 6.50×1015, 4.28×1015, and 7.39×1015 molec cm−2, respectively. In addition, the ship-based MAX-DOAS trace gas VCDs were compared with satellite observations of the Ozone Monitoring Instrument (OMI) and Ozone Mapping and Profiler Suite (OMPS). The daily OMI NO2 VCDs agreed well with ship-based MAX-DOAS measurements showing the correlation coefficient R of 0.83. In addition, the good agreements of SO2 and HCHO VCDs between the OMPS satellite and ship-based MAX-DOAS observations were also found, with correlation coefficients R of 0.76 and 0.69. The vertical profiles of these trace gases are achieved from the measured differential slant column densities (DSCDs) at different elevation angles using the optimal estimation method. The retrieved profiles displayed the typical vertical distribution characteristics, which exhibit low concentrations of <3, <3, and <2 ppbv for NO2, SO2, and HCHO in a clean area of the marine boundary layer far from coast of the Yangtze River Delta (YRD) continental region. Interestingly, elevated SO2 concentrations can be observed intermittently along the ship routes, which is mainly attributed to the vicinal ship emissions in the view of the MAX-DOAS measurements. Combined with the on-board ozone lidar measurements, the ozone (O3) formation was discussed with the vertical profile of the HCHO∕NO2 ratio, which is sensitive to increases in NO2 concentration. This study provided further understanding of the main air pollutants in the marine boundary layer of the ECS area and also benefited the formulation of policies regulating the shipping emissions in such costal areas like the YRD region.

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