[Elevation distribution of precipitation chemistry in middle/upper troposphere in summer, the northern slope of central Himalayas].
During 1997 summer, fresh snow samples were collected from four snowfall events from the elevation of 5800 to 7000 m in the Dasuopu Glacier region on the northern slope of Mt. Xixabangma (28 degrees 33'N, 85 degrees 44'E), in order to understand the elevation distribution of the middle/upper tropospheric components in the remote region. The correlation between SO4(2-), NO3-, Ca2+ and Mg2+ in precipitation differs with type of air mass, indicating the dominant sources of ions vary in short-term (e.g. several days) during summer low dust period. In general, with elevation increases, the concentrations of NO3-, Ca2+ and Mg2+ decreases, while SO4(2-) increases, which are influenced by the variation of dominant sources of ions.
Kang
S
S
Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environment and Engineering Research Institute, CAS, Lanzhou 730000, China. Kangsc@lzu.edu.cn
Qin
D
D
Yao
T
T
Ren
J
J
D000393:Air Pollutants / Q000032:analysis*; D002118:Calcium / Q000032:analysis*; D008274:Magnesium / Q000032:analysis*; D009566:Nitrates / Q000032:analysis*; D012914:Snow; D013431:Sulfates / Q000032:analysis*
D000393:Air Pollutants; D009566:Nitrates; D013431:Sulfates; D008274:Magnesium; D002118:Calcium