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

被引:30
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
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
收藏
页码:11831 / 11840
页数:10
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