Journal
GLOBAL AND PLANETARY CHANGE
Volume 130, Issue -, Pages 1-6Publisher
ELSEVIER
DOI: 10.1016/j.gloplacha.2015.03.008
Keywords
Surface soils; Environmental magnetism; Rb/Sr ratio; Tibetan Plateau; Climatic boundary
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB03020401]
- (973) National Basic Research Program of China [2013CB956400]
- NSFC [41321061, 41102101]
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Two atmospheric circulation systems, i.e., the mid-latitude Westerlies and the East Asian summer monsoon (EASM), dominate climate change in the NE Tibetan Plateau. However, controversy remains with regard to the climatic boundary between these westerly and monsoon regimes. In this paper, detailed rock magnetic and geochemical Rb/Sr analyses for a larger number of surface soils from a wide area in the NE Tibetan Plateau are presented. They show that surface soils in this region evince relatively significant regional variations in magnetic properties and geochemical characteristics. The magnetic parameters chi(fd), chi(ARM) and geochemical Rb/Sr ratios exhibit higher values in EASM-controlled (humid) areas, and lower values in Westerlies-influenced (arid) areas. These characteristics indicate that such variations in chi(fd), chi(ARM) and Rb/Sr ratios can be regarded as effective indicators of the degree of pedogenesis and weathering in the NE Tibetan Plateau. Our results also demonstrate that the climatic boundary between the westerly and monsoon regimes approximately overlaps with the boundary of highland meadow and temperate steppe desert/desert in NW China. (C) 2015 Elsevier B.V. All rights reserved.
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