globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.04.048
Scopus记录号: 2-s2.0-85047002380
论文题名:
Precipitation changes over the eastern Bolivian Andes inferred from speleothem (δ18O) records for the last 1400 years
作者: Apaéstegui J.; Cruz F.W.; Vuille M.; Fohlmeister J.; Espinoza J.C.; Sifeddine A.; Strikis N.; Guyot J.L.; Ventura R.; Cheng H.; Edwards R.L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 494
起始页码: 124
结束页码: 134
语种: 英语
英文关键词: Bolivia ; LIA ; MCA ; South American Monsoon ; speleothems ; stable isotopes
Scopus关键词: Isotopes ; Moisture ; Atmospheric circulation ; Bolivia ; Intertropical convergence zone ; Medieval Climate Anomaly (MCA) ; Precipitation regimes ; South American Monsoon ; speleothems ; Stable isotopes ; Tropics ; atmospheric circulation ; atmospheric convection ; global climate ; Little Ice Age ; Medieval Warm Period ; monsoon ; oxygen isotope ; precipitation assessment ; speleothem ; stable isotope ; Andes ; Bolivia
英文摘要: Here we present high-resolution δ18O records obtained from speleothems collected in the eastern Bolivian Andes. The stable isotope records are related to the regional- to large-scale atmospheric circulation over South America and allow interpreting changes in δ18O during the last 1400 yr as a function of changes in precipitation regimes over the southern tropical Andes. Two distinct phases with more negative δ18O values, interpreted as periods of increased convective activity over the eastern Andean Cordillera in Bolivia are observed concomitantly with periods of global climate anomalies during the last millennium, such as the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) respectively. Changes in the Bolivian δ18O record during the LIA are apparently related to a southward displacement of the Intertropical Convergence Zone (ITCZ), which acts as a main moisture driver to intensify convection over the tropical continent. During the MCA, however, the increased convective activity observed in the Bolivian record is likely the result of a different mechanism, which implies moisture sourced mainly from the southern tropical Atlantic. This interpretation is consistent with paleoclimate records further to the north in the tropical Andes that show progressively drier conditions during this time period, indicating a more northerly position of the ITCZ. The transition period between the MCA and the LIA shows a slight tendency toward increased δ18O values, indicating weakened convective activity. Our results also reveal a non-stationary anti-phased behavior between the δ18O reconstructions from Bolivia and northeastern Brazil that confirms a continental-scale east–west teleconnection across South America during the LIA. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109845
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Instituto Geofísico del Perú, Lima, Peru; Instituto Cientifico del Agua, Pontificia Universidad Católica del Perú, Lima, Peru; Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil; University at Albany, SUNY, Albany, NY, United States; Institute of Earth and Environmental Science, University of Potsdam, Potsdam, Germany; GFZ German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Development, Potsdam, Germany; UMR LOCEAN (IRD/UPMC/CNRS/MNHN), Paris-Jussieu, France; Departamento de Geoquimica, Universidade Federal Fluminense, Niterói, RJ, Brazil; UMR GET (IRD) Géosciences Environnement Toulouse, CNRS-IRD-UPS, OMP, Toulouse, France; Instituto de Geociências, Universidade de Brasilia, Brasilia, DF, Brazil; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China; Department of Geology and Geophysics, University of Minnesota, Twin Cities, Minneapolis, MN, United States

Recommended Citation:
Apaéstegui J.,Cruz F.W.,Vuille M.,et al. Precipitation changes over the eastern Bolivian Andes inferred from speleothem (δ18O) records for the last 1400 years[J]. Earth and Planetary Science Letters,2018-01-01,494
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