globalchange  > 气候变化事实与影响
DOI: 10.1016/j.atmosenv.2017.08.017
Scopus记录号: 2-s2.0-85027556432
论文题名:
Drought impacts on photosynthesis, isoprene emission and atmospheric formaldehyde in a mid-latitude forest
作者: Zheng Y; , Unger N; , Tadić J; M; , Seco R; , Guenther A; B; , Barkley M; P; , Potosnak M; J; , Murray L; T; , Michalak A; M; , Qiu X; , Kim S; , Karl T; , Gu L; , Pallardy S; G
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 167
起始页码: 190
结束页码: 201
语种: 英语
英文关键词: Formaldehyde ; Gross primary productivity ; Satellite ; Solar-induced fluorescence ; The Missouri Ozarks ; Water stress
Scopus学科分类: Environmental Science: Water Science and Technology ; Earth and Planetary Sciences: Earth-Surface Processes ; Environmental Science: Environmental Chemistry
英文摘要: Isoprene plays a critical role in air quality and climate. Photosynthesis (gross primary productivity, GPP) and formaldehyde (HCHO) are both related to isoprene emission at large spatiotemporal scales, but neither is a perfect proxy. We apply multiple satellite products and site-level measurements to examine the impact of water deficit on the three interlinked variables at the Missouri Ozarks site during a 20-day mild dryness stress in summer 2011 and a 3-month severe drought in summer 2012. Isoprene emission shows opposite responses to the short- and long-term droughts, while GPP was substantially reduced in both cases. In 2012, both remote-sensed solar-induced fluorescence (SIF) and satellite HCHO column qualitatively capture reductions in flux-derived GPP and isoprene emission, respectively, on weekly to monthly time scales, but with muted responses. For instance, as flux-derived GPP approaches zero in late summer 2012, SIF drops by 29–33% (July) and 19–27% (August) relative to year 2011. A possible explanation is that electron transport and photosystem activity are maintained to a certain extent under the drought stress. Similarly, flux tower isoprene emissions in July 2012 are 54% lower than July 2011, while the relative reductions in July for 3 independent satellite-derived HCHO data products are 27%, 12% and 6%, respectively. We attribute the muted HCHO response to a photochemical feedback whereby reduced isoprene emission increases the oxidation capacity available to generate HCHO from other volatile organic compound sources. Satellite SIF offers a potential alternative indirect method to monitor isoprene variability at large spatiotemporal scales from space, although further research is needed under different environmental conditions and regions. Our analysis indicates that fairly moderate reductions in satellite SIF and HCHO column may imply severe drought conditions at the surface. © 2017 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82201
Appears in Collections:气候变化事实与影响

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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT, United States; College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, United States; Department of Earth System Science, University of California, Irvine, CA, United States; EOS Group, Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom; Environmental Science and Studies, DePaul University, Chicago, IL, United States; Department of Earth and Environmental Sciences, University of RochesterNY, United States; Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria; Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Department of Forestry, University of Missouri, Columbia, MO, United States; Earth and Environmental Sciences Area, Lawrence Berkeley National Lab, Berkeley, CA, United States

Recommended Citation:
Zheng Y,, Unger N,, Tadić J,et al. Drought impacts on photosynthesis, isoprene emission and atmospheric formaldehyde in a mid-latitude forest[J]. Atmospheric Environment,2017-01-01,167
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