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A 1000 year history of atmospheric sulfate concentrations in southern Asia as recorded by a Himalayan ice core
Author(s) -
Duan Keqin,
Thompson L. G.,
Yao T.,
Davis M. E.,
MosleyThompson E.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl027456
Subject(s) - sulfate , ice core , glacier , environmental science , groenlandia , east asia , period (music) , atmospheric sciences , deposition (geology) , physical geography , climatology , geology , geography , oceanography , chemistry , china , ice sheet , geomorphology , physics , organic chemistry , archaeology , sediment , acoustics
A sulfate record covering the period A.D. 1000–1997 from the Dasuopu glacier in the Himalayas reveals that this site is sensitive to anthropogenic activity originating in southern Asia. Prior to 1870 atmospheric sulfate concentrations were relatively low and constant, but thereafter concentrations have increased and since 1930 the rate of increase has accelerated rapidly. This accelerating trend in sulfate deposition is paralleled by growing SO 2 emissions over southern Asia resulting from the increased energy demand. The concentration of sulfate deposited in the last 50 years exceeds that for any prior 50‐year period in the last millennium. Unlike the Greenland ice core‐derived sulfate concentrations that have declined since the 1970s, sulfate concentrations deposited on the Himalayan ice fields continue to increase, having nearly doubled since 1970. This reflects regional differences between Europe and Asia in source strength and transport pathways for atmospheric sulfate, as well as differing degrees of environmental regulation.