气候变化领域集成服务门户(CCPortal): The inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau

CCPortal

DOI	10.1016/j.orggeochem.2014.05.013
	The inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau
	Bai, Yan; Tian, Qian; Fang, Xiaomin; Wu, Fuli
通讯作者	Fang, XM (通讯作者)
发表日期	2014
ISSN	0146-6380
EISSN	1873-5290
起始页码	90
结束页码	100
卷号	73
英文摘要	The response of soil wax derived n-alkane hydrogen isotope values (dDwax, the abundance weighted average dD values of the C29 and C31 n-alkanes) and isotopic lapse rates (the average change in dDwax with elevation) to factors other than elevation change should be assessed and taken into account for quantitative elevation reconstructions. To shed more light on how plant wax derived n-alkanes may be used for this purpose, soil and Gramineae samples analyzed for dDwax values. Those were derived from the foreland basin, the mountain vegetation zone and glacier catchment areas along the Beida River (a tributary in the Heihe River Basin; up to the headwaters of the Qiyi glacier), and the Xiying River catchment (up to the headwaters and glaciated areas of the Lenglong Range), located on the northeastern Tibetan Plateau. For comparison, this study analyzed surface soils from the Maxian Mountains for dDwax. As a whole, the trend in dDwax in the study regions seems to primarily reflect dDrw (dD values of river water) and/ or dDp (dD values of precipitation). These data show good inverse linear relationships between Gramineae and soil dDwax values and elevation (altitude effect) in the mountain vegetation zone of the Xiying River catchment (2200-3500 m) and Maxian Mountains (2800-3700 m), where the elevation effect becomes the main control factor even in the dry Qilian Mountains. However, at the low elevation sites, soil and Gramineae dDwax values from the Xiying River (1750-2200 m) and Maxian Mountains (2060-2800 m) show the `` inverse altitude effect''. The recycled fraction and trajectory of water vapor may result in these positive dDwax elevation gradients in dry continental settings. The `` inverse altitude effect'' has also been observed in periglacial regions below the Qiyi glacier and from the Lenglong Range. We interpret this effect as evidence of stronger fractionation processes occurring in the freeze-thaw mass exchange between the solid and liquid phases at high elevations. Thus, the `` inverse altitude effect'' can be attributed to the decrease of precipitation amount in the upper valley and to marked fractionation in soil water and the residual or melting snow in periglacial regions, which may complicate the isotope thermometry. When interpreting changes of long term dD and d 18O records for determining elevation change, one must consider all possible influences on the lapse rate of dDwax values with elevation, including the patterns of atmospheric circulation in the past, topography, recycling of moisture in dry continental settings, and strong fractionation processes effecting soil and glacier melt water in the periglacial regions. (C) 2014 Elsevier Ltd. All rights reserved.
关键词	DELTA-D VALUES ISOTOPIC COMPOSITION LATE MIOCENE HEIHE RIVER PRECIPITATION PALEOELEVATION PLANTS WATER ELEVATION CLIMATE
英文关键词	Leaf wax-derived n-alkane dD; Inverse altitude effect; Northeastern Tibetan Plateau; Qilian Shan; Paleoelevation reconstruction; Hydrogen isotope fractionation; Climate
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000338967500010
来源期刊	ORGANIC GEOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258258
推荐引用方式 GB/T 7714	Bai, Yan,Tian, Qian,Fang, Xiaomin,et al. The inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2014,73.
APA	Bai, Yan,Tian, Qian,Fang, Xiaomin,&Wu, Fuli.(2014).The inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau.ORGANIC GEOCHEMISTRY,73.
MLA	Bai, Yan,et al."The inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau".ORGANIC GEOCHEMISTRY 73(2014).