What drives interannual variation in tree ring oxygen isotopes in the Amazon?

被引：31

作者：

Baker, J. C. A. ^{[1
]}

Gloor, M. ^{[1
]}

Spracklen, D. V. ^{[2
]}

Arnold, S. R. ^{[2
]}

Tindall, J. C. ^{[2
]}

Clerici, S. J. ^{[1
]}

Leng, M. J. ^{[3
,4
]}

Brienen, R. J. W. ^{[1
]}

机构：

[1] Univ Leeds, Sch Geog, Leeds, W Yorkshire, England

[2] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England

[3] British Geol Survey, NERC Isotope Geosci Facil, Nottingham, England

[4] Univ Nottingham, Ctr Environm Geochem, Nottingham, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 22期

关键词：

ICE CORE RECORDS; STABLE-ISOTOPES; PRECIPITATION DELTA-O-18; TROPICAL CLIMATE; SOUTH-AMERICA; LEAF WATER; VARIABILITY; CELLULOSE; HISTORY; RATIOS;

D O I：

10.1002/2016GL071507

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Oxygen isotope ratios in tree rings (delta O-18(TR)) from northern Bolivia record local precipitation delta O-18 and correlate strongly with Amazon basin-wide rainfall. While this is encouraging evidence that delta O-18(TR) can be used for paleoclimate reconstructions, it remains unclear whether variation in delta O-18(TR) is truly driven by within-basin processes, thus recording Amazon climate directly, or if the isotope signal may already be imprinted on incoming vapor, perhaps reflecting a pan-tropical climate signal. We use atmospheric back trajectories combined with satellite observations of precipitation, together with water vapor transport analysis to show that delta O-18(TR) in Bolivia are indeed controlled by basin-intrinsic processes, with rainout over the basin the most important factor. Furthermore, interannual variation in basin-wide precipitation and atmospheric circulation are both shown to affect delta O-18(TR). These findings suggest delta O-18(TR) can be reliably used to reconstruct Amazon precipitation and have implications for the interpretation of other paleoproxy records from the Amazon basin.

引用

页码：11831 / 11840

页数：10

共 73 条

[1] Tropical cloud forest climate variability and the demise of the Monteverde golden toad [J].