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Title: Isoprene emission from terrestrial ecosystems in response to global change: minding the gap between models and observations.

Abstract

Coupled surface-atmosphere models are being used with increased frequency to make predictions of tropospheric chemistry on a 'future' earth characterized by a warmer climate and elevated atmospheric CO2 concentration. One of the key inputs to these models is the emission of isoprene from forest ecosystems. Most models in current use rely on a scheme by which global change is coupled to changes in terrestrial net primary productivity (NPP) which, in turn, is coupled to changes in the magnitude of isoprene emissions. In this study, we conducted measurements of isoprene emissions at three prominent global change experiments in the United States. Our results showed that growth in an atmosphere of elevated CO2 inhibited the emission of isoprene at levels that completely compensate for possible increases in emission due to increases in aboveground NPP. Exposure to a prolonged drought caused leaves to increase their isoprene emissions despite reductions in photosynthesis, and presumably NPP. Thus, the current generation of models intended to predict the response of isoprene emission to future global change probably contain large errors. A framework is offered as a foundation for constructing new isoprene emission models based on the responses of leaf biochemistry to future climate change and elevated atmosphericmore » CO2 concentrations.« less

Authors:
 [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Other RIB Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
930890
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Philosophical Transactions of the Royal Society A: Mathematical, Physical & Engineering Sciences
Additional Journal Information:
Journal Volume: 365; Journal Issue: 1856
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; BIOCHEMISTRY; CHEMISTRY; CLIMATES; DROUGHTS; ECOSYSTEMS; FORESTS; ISOPRENE; PHOTOSYNTHESIS; PRODUCTIVITY; TERRESTRIAL ECOSYSTEMS; volatile organic compound; VOC; hydrocarbon; 2-methyl-1; 3-butadiene; air pollution; NPP

Citation Formats

Norby, Richard J. Isoprene emission from terrestrial ecosystems in response to global change: minding the gap between models and observations.. United States: N. p., 2007. Web.
Norby, Richard J. Isoprene emission from terrestrial ecosystems in response to global change: minding the gap between models and observations.. United States.
Norby, Richard J. Mon . "Isoprene emission from terrestrial ecosystems in response to global change: minding the gap between models and observations.". United States.
@article{osti_930890,
title = {Isoprene emission from terrestrial ecosystems in response to global change: minding the gap between models and observations.},
author = {Norby, Richard J},
abstractNote = {Coupled surface-atmosphere models are being used with increased frequency to make predictions of tropospheric chemistry on a 'future' earth characterized by a warmer climate and elevated atmospheric CO2 concentration. One of the key inputs to these models is the emission of isoprene from forest ecosystems. Most models in current use rely on a scheme by which global change is coupled to changes in terrestrial net primary productivity (NPP) which, in turn, is coupled to changes in the magnitude of isoprene emissions. In this study, we conducted measurements of isoprene emissions at three prominent global change experiments in the United States. Our results showed that growth in an atmosphere of elevated CO2 inhibited the emission of isoprene at levels that completely compensate for possible increases in emission due to increases in aboveground NPP. Exposure to a prolonged drought caused leaves to increase their isoprene emissions despite reductions in photosynthesis, and presumably NPP. Thus, the current generation of models intended to predict the response of isoprene emission to future global change probably contain large errors. A framework is offered as a foundation for constructing new isoprene emission models based on the responses of leaf biochemistry to future climate change and elevated atmospheric CO2 concentrations.},
doi = {},
journal = {Philosophical Transactions of the Royal Society A: Mathematical, Physical & Engineering Sciences},
number = 1856,
volume = 365,
place = {United States},
year = {2007},
month = {1}
}