干旱区生态环境知识资源中心(Arid): Coeval Drying Across the Central Tropical Pacific Over the Last Millennium

Arid

DOI	10.1029/2021PA004311
	Coeval Drying Across the Central Tropical Pacific Over the Last Millennium
	Wyman, D. A.; Conroy, J. L.; Osburn, M. R.; Atwood, A. R.
通讯作者	Wyman, DA (corresponding author), Univ Illinois, Dept Geol, Urbana, IL 61801 USA.
来源期刊	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
ISSN	2572-4517
EISSN	2572-4525
出版年	2021
卷号	36 期号:7
英文摘要	Hydroclimatic variability in the tropical Pacific reflects large-scale ocean-atmosphere processes that imprint on global climate, but tropical Pacific hydroclimate variability over the last millennium remains uncertain. Here we present a multi-proxy reconstruction from a lacustrine sediment record on Kiritimati Atoll that spans the last millennium. A lake salinity reconstruction from the delta H-2 values of total lipid extracts, combined with changes in sediment mineralogy and the stable isotopic composition of inorganic carbonates, indicate the presence of several distinct hydrologic regimes on Kiritimati, including a period of persistent aridity from 960-1030 CE, shorter episodes of aridity from 1030-1370 CE, and extreme aridity throughout the latter half of the last millennium, from 1370-1970 CE, that drove complete evaporation of the lake. A period of wetter, variable conditions defines recent decades. Compound-specific lipid biomarker delta H-2 values indicate that shifts in microbial community structure occurred in the past, from a community dominated by photoautotrophic and chemoautotrophic organisms in more arid periods to a more metabolically diverse community in the recent period. Comparison of this record with nearby sediment records from Washington Island reveals a similar pattern of aridity through the last millennium, followed by wetter conditions in the modern period. These coherent changes in hydroclimate in the central Pacific are inconsistent with a migration of the Pacific Intertropical Convergence Zone within these latitudes. Rather, past aridity was caused by reduced El Nino-Southern Oscillation variability, observed through the low-pass filter of lacustrine records, or by multidecadal to multi-century strengthening of the Pacific Walker Circulation.
英文关键词	biomarker hydroclimate lake salinity stable isotope tropical Pacific
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000679067400010
WOS关键词	INTERTROPICAL CONVERGENCE ZONE ; CLIMATE VARIABILITY ; HYDROGEN ; FRACTIONATION ; GALAPAGOS ; SALINITY ; DYNAMICS ; LIPIDS ; ISLAND ; PHOTOSYNTHESIS
WOS类目	Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS研究方向	Geology ; Oceanography ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368632
作者单位	[Wyman, D. A.; Conroy, J. L.] Univ Illinois, Dept Geol, Urbana, IL 61801 USA; [Conroy, J. L.] Univ Illinois, Dept Plant Biol, Urbana, IL USA; [Osburn, M. R.] Northwestern Univ, Dept Earth & Planetary Sci, Evanston, IL USA; [Atwood, A. R.] Florida State Univ, Earth Ocean & Atmospher Sci Dept, Tallahassee, FL 32306 USA
推荐引用方式 GB/T 7714	Wyman, D. A.,Conroy, J. L.,Osburn, M. R.,et al. Coeval Drying Across the Central Tropical Pacific Over the Last Millennium[J],2021,36(7).
APA	Wyman, D. A.,Conroy, J. L.,Osburn, M. R.,&Atwood, A. R..(2021).Coeval Drying Across the Central Tropical Pacific Over the Last Millennium.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,36(7).
MLA	Wyman, D. A.,et al."Coeval Drying Across the Central Tropical Pacific Over the Last Millennium".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 36.7(2021).