Solar modulation of little ice age climate in the tropical Andes

被引：87

作者：

Polissar, P. J.

Abbott, M. B.

Wolfe, A. P.

Bezada, M.

Rull, V.

Bradley, R. S.

机构：

[1] Univ Massachusetts, Dept Geosci, Morrill Sci Ctr, Amherst, MA 01003 USA

[2] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[3] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada

[4] Univ Pedag Expt Libertador, Dept Ciencias Tierra, Caracas, Venezuela

[5] Univ Autonoma Barcelona, Dept Biol Anim Vegetal & Ecol, E-08193 Barcelona, Spain

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2006年 / 103卷 / 24期

关键词：

climate forcing; glacier reconstruction; moisture balance; Venezuela;

D O I：

10.1073/pnas.0603118103

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The underlying causes of late-Holocene climate variability in the tropics are incompletely understood. Here we report a 1,500-year reconstruction of climate history and glaciation in the Venezuelan Andes using lake sediments. Four glacial advances occurred between anno Domini (A.D.) 1250 and 1810, coincident with solar-activity minima. Temperature declines of -3.2 +/- 1.4 degrees C and precipitation increases of approximate to 20% are required to produce the observed glacial responses. These results highlight the sensitivity of high-altitude tropical regions to relatively small changes in radiative forcing, implying even greater probable responses to future anthropogenic forcing.

引用

页码：8937 / 8942

页数：6

共 61 条

[1]

[Anonymous], 1992, ERDKUNDE

[2]

[Anonymous], ERDWISS FORSCH

[3]

Appleby P.G., 1978, CATENA, V5, P1, DOI [DOI 10.1016/S0341-8162, 10.1016/S0341-8162(78)80002-2, DOI 10.1016/S0341-8162(78)80002-2]

[4] Solar irradiance during the last 1200 years based on cosmogenic nuclides [J].