Arid
DOI10.1130/G32052.1
Climate change imprinting on stable isotopic compositions of high-elevation meteoric water cloaks past surface elevations of major orogens
Poulsen, Christopher J.; Jeffery, M. Louise
通讯作者Poulsen, Christopher J.
来源期刊GEOLOGY
ISSN0091-7613
出版年2011
卷号39期号:6页码:595-598
英文摘要

Stable isotope paleoaltimetry has been widely used to estimate Cenozoic surface elevation of major orogens. The influence of global climate change on stable isotope paleoaltimetry is uncertain, with proposals that warming could cause either overestimates or underestimates of past surface elevations. In this study we increase atmospheric pCO(2) by two and four times in an isotope-tracking atmospheric general circulation model to investigate the effect of global warming on oxygen isotopic compositions of precipitation (delta O-18(p)) over the continents. As in other climate models, the response in the GENESIS version 3 model to global warming is an amplification of upper troposphere temperatures through enhanced infrared absorption and a reduction in the surface to upper-level temperature gradient. Due to the temperature dependence of isotopic fractionation, vapor delta O-18 (delta O-18(v)) follows suit, leading to a reduction in the surface to upper troposphere delta O-18(v) gradient. In regions of subsidence, including the major orogens and deserts, downward mixing of O-18-enriched vapor from the troposphere to the near surface further reduces the lapse rate of delta O-18(v). As a consequence of these effects, the isotopic composition of precipitation in high-elevation regions, including the Tibetan Plateau, Rocky Mountains, European Alps, and Andean Plateau, increases by 3%-6% relative to that at low elevations. Neglect of this climate effect on high-elevation delta O-18(p) has likely led to underestimates of the surface elevation of Cenozoic orogens.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000291096300021
WOS关键词SIERRA-NEVADA ; PALEOALTIMETRY ; PRECIPITATION ; PALEOELEVATION ; SIMULATION ; PALEOGENE ; MODEL
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/168247
作者单位Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
推荐引用方式
GB/T 7714
Poulsen, Christopher J.,Jeffery, M. Louise. Climate change imprinting on stable isotopic compositions of high-elevation meteoric water cloaks past surface elevations of major orogens[J],2011,39(6):595-598.
APA Poulsen, Christopher J.,&Jeffery, M. Louise.(2011).Climate change imprinting on stable isotopic compositions of high-elevation meteoric water cloaks past surface elevations of major orogens.GEOLOGY,39(6),595-598.
MLA Poulsen, Christopher J.,et al."Climate change imprinting on stable isotopic compositions of high-elevation meteoric water cloaks past surface elevations of major orogens".GEOLOGY 39.6(2011):595-598.
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