Geography

Title

Heat and drought extremes likely to stress ecosystem productivity equally or more in a warmer, CO2rich future

Document Type

Article

Abstract

Reduced carbon uptake caused by recent heat and drought extremes raises concerns about biospheric feedbacks that amplify global warming. However, elevated carbon dioxide is expected to boost terrestrial ecosystem productivity over the 21st century, potentially alleviating some of the adverse carbon impacts of climate extremes. Using CMIP5 earth system model (ESM) results, Ian Williams and colleagues (2014 Environ. Res. Lett. 9 094011) find that the carbon impacts of heat and drought extremes in the future are likely to be similar to those seen in today's climate only shifted toward fluctuations around a higher average temperature. However, they also find that extremes may become more frequent and longer lived, causing further reductions in carbon uptake. Considering that ESMs generally miss a host of heat and drought induced mortality mechanisms that could exacerbate adverse carbon impacts, it is logical to expect that the impacts of today's heat and drought extremes are likely underestimates of what we can expect in the future with a high fossil emissions pathway.

Publication Title

Environmental Research Letters

Publication Date

2014

Volume

9

Issue

10

ISSN

1748-9318

DOI

10.1088/1748-9326/9/10/101002

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