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Dust Storm Outbreak in Central Asia After ~3.5 kyr BP
Author(s) -
Han Wenxia,
Lü Shuang,
Appel Erwin,
Berger André,
Madsen David,
Vandenberghe Jef,
Yu Lupeng,
Han Yongxiang,
Yang Yibo,
Zhang Tao,
Teng Xiaohua,
Fang Xiaomin
Publication year - 2019
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 - 10.1029/2018gl081795
Subject(s) - northern hemisphere , dust storm , climatology , storm , geology , atmospheric sciences , environmental science , holocene , oceanography
The evolution and driving factors underlying dust activity in central Asia remain controversial, particularly in its effects on downwind regions. We present a Holocene dust storm activity record retrieved from the Tarim Basin (TB) and perform linear and nonlinear analyses on dust records from the TB and the Greenland areas. The results indicate a similar response of dust activities to total solar irradiance in both areas, and an outbreak of dust storms in the TB at ~3.5 kyr BP. We suggest that decreasing temperature in high northern latitudes, aided by solar activity change, reached a critical threshold near ~3.5 kyr BP. The resulting steepening of the meridional temperature gradient would have facilitated strengthening and southward shift of the Northern Hemisphere westerly jet, leading to the outbreak of dust storms through intensification of low level wind intensity and prolonged spring conditions in the Asian interior.