| Title: | Separating direct and indirect effects of rising temperatures on biogenic volatile emissions in the Arctic |
| Author(s): | Rinnan R; Iversen LL; Tang J; Vedel-Petersen I; Schollert M; Schurgers G; |
| Address: | "Terrestrial Ecology Section, Department of Biology, University of Copenhagen, DK-2100 Copenhagen O, Denmark; riikkar@bio.ku.dk. Center for Permafrost (CENPERM), University of Copenhagen, DK-1350 Copenhagen K, Denmark. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720. Terrestrial Ecology Section, Department of Biology, University of Copenhagen, DK-2100 Copenhagen O, Denmark. Department of Physical Geography and Ecosystem Science, Lund University, SE-22362 Lund, Sweden. Systems Ecology Section, Department of Ecological Science, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands. Department of Geosciences and Natural Resource Management, University of Copenhagen, DK-1350 Copenhagen K, Denmark" |
| ISSN/ISBN: | 1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking) |
| Abstract: | "Volatile organic compounds (VOCs) are released from biogenic sources in a temperature-dependent manner. Consequently, Arctic ecosystems are expected to greatly increase their VOC emissions with ongoing climate warming, which is proceeding at twice the rate of global temperature rise. Here, we show that ongoing warming has strong, increasing effects on Arctic VOC emissions. Using a combination of statistical modeling on data from several warming experiments in the Arctic tundra and dynamic ecosystem modeling, we separate the impacts of temperature and soil moisture into direct effects and indirect effects through vegetation composition and biomass alterations. The indirect effects of warming on VOC emissions were significant but smaller than the direct effects, during the 14-y model simulation period. Furthermore, vegetation changes also cause shifts in the chemical speciation of emissions. Both direct and indirect effects result in large geographic differences in VOC emission responses in the warming Arctic, depending on the local vegetation cover and the climate dynamics. Our results outline complex links between local climate, vegetation, and ecosystem-atmosphere interactions, with likely local-to-regional impacts on the atmospheric composition" |
| Keywords: | climate change ecosystem modelling ecosystem-atmosphere interactions vegetation change; |
| Notes: | "PubMed-not-MEDLINERinnan, Riikka Iversen, Lars L Tang, Jing Vedel-Petersen, Ida Schollert, Michelle Schurgers, Guy eng Research Support, Non-U.S. Gov't 2020/12/02 Proc Natl Acad Sci U S A. 2020 Dec 22; 117(51):32476-32483. doi: 10.1073/pnas.2008901117. Epub 2020 Nov 30" |
