Atmospheric CO2 concentrations during ancient greenhouse climates were similar to those predicted for AD 2100

被引：165

作者：

Breecker, D. O. ^{[1
]}

Sharp, Z. D. ^{[1
]}

McFadden, L. D. ^{[1
]}

机构：

[1] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2010年 / 107卷 / 02期

基金：

美国国家科学基金会;

关键词：

paleosol barometer; carbon isotopes; pedogenic carbonate; Phanerozoic; climate sensitivity; STABLE-ISOTOPIC COMPOSITION; CARBON-DIOXIDE; PEDOGENIC CARBONATE; FOSSIL GINKGO; STOMATAL CHARACTERS; CO2-FORCED CLIMATE; SOIL RESPIRATION; RAIN-FORESTS; EMISSIONS; LEAVES;

D O I：

10.1073/pnas.0902323106

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：

Quantifying atmospheric CO2 concentrations ([CO2](atm)) during Earth's ancient greenhouse episodes is essential for accurately predicting the response of future climate to elevated CO2 levels. Empirical estimates of [CO2](atm) during Paleozoic and Mesozoic greenhouse climates are based primarily on the carbon isotope composition of calcium carbonate in fossil soils. We report that greenhouse [CO2](atm) have been significantly overestimated because previously assumed soil CO2 concentrations during carbonate formation are too high. More accurate [CO2](atm), resulting from better constraints on soil CO2, indicate that large ( 1,000s of ppmV) fluctuations in [CO2](atm) did not characterize ancient climates and that past greenhouse climates were accompanied by concentrations similar to those projected for A. D. 2100.

引用

页码：576 / 580

页数：5

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