title: Spatial and temporal variability of marine-origin matter along a transect from Zhongshan Station to Dome A, Eastern Antarctica.
abstract: The spatiotemporal distribution pattern of marine-origin matter on the Antarctica ice sheet was used to study variations in the source regions, transport mechanisms and post-depositional influences. We present data on sea salt ions, sulfur components and stable isotopes from surface and snow pit samples collected along the transect route from Zhongshan Station to Dome A during the austral summer in 2012-2013. A general decreasing trend in the accumulation, sea salt ions and sulfur components occurred with increasing distance from the coast and increasing elevation. However, different sources of the marine components, transport pathways and post-depositional influences were responsible for their different spatial distribution patterns. The marine ions in the coastal snow pit varied seasonally, with higher sea salt ion concentrations in the winter and lower concentrations in the summer; the opposite pattern was found for the sulfur compounds. The sea ice area surrounding Antarctica was the main source region for the deposited sea salt and the open sea water for the sulfur compounds. No significant trends in the marine-origin components were detected during the past 3 decades. Several periods of elevated deposition of sea salt ions were associated with lower temperatures (based on δD and δ(18)O) or intensified wind fields. In comparison to the sea salt ions, the sulfur concentrations exhibited the opposite distribution patterns and were associated with changes in the surrounding sea ice extent.
authors: The State Key Laboratory of the Cryospheric Sciences, The Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
authors: Chuanjin
authors: C
authors: Li
authors: The State Key Laboratory of the Cryospheric Sciences, The Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; Climate System Institute, Chinese Academy of Meteorological Sciences, Beijing 100081, China. Electronic address: cdxiao@cams.cma.gov.cn.
authors: Cunde
authors: C
authors: Xiao
authors: Polar Research Institute of China, Shanghai 200136, China.
authors: Guitao
authors: G
authors: Shi
authors: The State Key Laboratory of the Cryospheric Sciences, The Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; Climate System Institute, Chinese Academy of Meteorological Sciences, Beijing 100081, China.
authors: Minghu
authors: M
authors: Ding
authors: The State Key Laboratory of the Cryospheric Sciences, The Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
authors: Dahe
authors: D
authors: Qin
authors: The State Key Laboratory of the Cryospheric Sciences, The Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
authors: Jiawen
authors: J
authors: Ren
mesh_terms: D000864:Antarctic Regions; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D012621:Seasons; D012914:Snow / Q000737:chemistry*; D013457:Sulfur Compounds / Q000032:analysis
chemical_list: D004785:Environmental Pollutants; D013457:Sulfur Compounds
keywords: Dome A; Eastern Antarctica; Marine-origin matter; Transect