Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America

Sherilyn C. Fritz, Paul A. Baker, Tim K. Lowenstein, Geoffrey O. Seltzer, Catherine A. Rigsby, Gary S. Dwyer, Pedro M. Tapia, Kimberly K. Arnold, Teh Lung Ku, Shangde Luo

研究成果: Article

136 引文 (Scopus)

摘要

Despite the hypothesized importance of the tropics in the global climate system, few tropical paleoclimatic records extend to periods earlier than the last glacial maximum (LGM), about 20,000 years before present. We present a well-dated 170,000-year time series of hydrologic variation from the southern hemisphere tropics of South America that extends from modern times through most of the penultimate glacial period. Alternating mud and salt units in a core from Salar de Uyuni, Bolivia reflect alternations between wet and dry periods. The most striking feature of the sequence is that the duration of paleolakes increased in the late Quaternary. This change may reflect increased precipitation, geomorphic or tectonic processes that affected basin hydrology, or some combination of both. The dominance of salt between 170,000 and 140,000 yr ago indicates that much of the penultimate glacial period was dry, in contrast to wet conditions in the LGM. Our analyses also suggest that the relative influence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times.

原文English
頁(從 - 到)95-104
頁數10
期刊Quaternary Research
61
發行號1
DOIs
出版狀態Published - 2004 一月

指紋

Last Glacial Maximum
Southern Hemisphere
salt
insolation
global climate
hydrology
mud
moisture
time series
tectonics
basin
South America
tropics
Hemisphere
Salt
Tropics
budget
Modern Times
Tropical
Tectonics

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Earth-Surface Processes
  • Earth and Planetary Sciences(all)

引用此文

Fritz, S. C., Baker, P. A., Lowenstein, T. K., Seltzer, G. O., Rigsby, C. A., Dwyer, G. S., ... Luo, S. (2004). Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America. Quaternary Research, 61(1), 95-104. https://doi.org/10.1016/j.yqres.2003.08.007
Fritz, Sherilyn C. ; Baker, Paul A. ; Lowenstein, Tim K. ; Seltzer, Geoffrey O. ; Rigsby, Catherine A. ; Dwyer, Gary S. ; Tapia, Pedro M. ; Arnold, Kimberly K. ; Ku, Teh Lung ; Luo, Shangde. / Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America. 於: Quaternary Research. 2004 ; 卷 61, 編號 1. 頁 95-104.
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Fritz, SC, Baker, PA, Lowenstein, TK, Seltzer, GO, Rigsby, CA, Dwyer, GS, Tapia, PM, Arnold, KK, Ku, TL & Luo, S 2004, 'Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America', Quaternary Research, 卷 61, 編號 1, 頁 95-104. https://doi.org/10.1016/j.yqres.2003.08.007

Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America. / Fritz, Sherilyn C.; Baker, Paul A.; Lowenstein, Tim K.; Seltzer, Geoffrey O.; Rigsby, Catherine A.; Dwyer, Gary S.; Tapia, Pedro M.; Arnold, Kimberly K.; Ku, Teh Lung; Luo, Shangde.

於: Quaternary Research, 卷 61, 編號 1, 01.2004, p. 95-104.

研究成果: Article

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AU - Lowenstein, Tim K.

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AU - Rigsby, Catherine A.

AU - Dwyer, Gary S.

AU - Tapia, Pedro M.

AU - Arnold, Kimberly K.

AU - Ku, Teh Lung

AU - Luo, Shangde

PY - 2004/1

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N2 - Despite the hypothesized importance of the tropics in the global climate system, few tropical paleoclimatic records extend to periods earlier than the last glacial maximum (LGM), about 20,000 years before present. We present a well-dated 170,000-year time series of hydrologic variation from the southern hemisphere tropics of South America that extends from modern times through most of the penultimate glacial period. Alternating mud and salt units in a core from Salar de Uyuni, Bolivia reflect alternations between wet and dry periods. The most striking feature of the sequence is that the duration of paleolakes increased in the late Quaternary. This change may reflect increased precipitation, geomorphic or tectonic processes that affected basin hydrology, or some combination of both. The dominance of salt between 170,000 and 140,000 yr ago indicates that much of the penultimate glacial period was dry, in contrast to wet conditions in the LGM. Our analyses also suggest that the relative influence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times.

AB - Despite the hypothesized importance of the tropics in the global climate system, few tropical paleoclimatic records extend to periods earlier than the last glacial maximum (LGM), about 20,000 years before present. We present a well-dated 170,000-year time series of hydrologic variation from the southern hemisphere tropics of South America that extends from modern times through most of the penultimate glacial period. Alternating mud and salt units in a core from Salar de Uyuni, Bolivia reflect alternations between wet and dry periods. The most striking feature of the sequence is that the duration of paleolakes increased in the late Quaternary. This change may reflect increased precipitation, geomorphic or tectonic processes that affected basin hydrology, or some combination of both. The dominance of salt between 170,000 and 140,000 yr ago indicates that much of the penultimate glacial period was dry, in contrast to wet conditions in the LGM. Our analyses also suggest that the relative influence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times.

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