Temperature depression in the lowland tropics in glacial times

被引:99
作者
Colinvaux, PA
Liu, KB
DeOliveira, P
Bush, MB
Miller, MC
Kannan, MS
机构
[1] LOUISIANA STATE UNIV, DEPT GEOG & ANTHROPOL, BATON ROUGE, LA 70803 USA
[2] FIELD MUSEUM NAT HIST, DEPT GEOL, CHICAGO, IL 60605 USA
[3] DUKE UNIV, DEPT BOT, DURHAM, NC 27708 USA
[4] UNIV CINCINNATI, DEPT BIOL SCI, CINCINNATI, OH 45221 USA
[5] NO KENTUCKY UNIV, DEPT BIOL, HIGHLAND HTS, KY 41076 USA
关键词
D O I
10.1007/BF00141276
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Equatorial air temperatures at low elevations in the New World tropics are shown by pollen and other data to have been significantly lowered in long intervals of the last glaciation. These new data show that long recognized evidence for cooling at high elevations in the tropics were symptomatic of general tropical cooling and that they did not require appeal to altered lapse rates or other special mechanisms to be made to conform with conclusions that equatorial sea surface temperatures (SSTs) were scarcely changed in glacial times. The new data should be read in conjunction with recent findings that Caribbean (SSTs) were lowered in the order of 5 degrees C, contrary to previous interpretations. Thus these accumulating data show that low latitudes as well as high were cooled in glaciations. In part the earlier failure: to find evidence of low elevation cooling in the lowland tropics resulted from the data being masked by strong signals for aridity given by old lake levels in pacts of Africa and elsewhere. Global circulation models used to predict future effects of greenhouse warming must also be able to simulate the significant cooling of the large tropical land masses at glacial times with reduced greenhouse gas concentrations. Plants and animals of the Amazon forest and similar ecosystems are able to survive in wide ranges of temperatures, CO2 concentrations, and disturbance, though associations change constantly.
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页码:19 / 33
页数:15
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