Separating direct and indirect effects of rising temperatures on biogenic volatile emissions in the Arctic
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Separating direct and indirect effects of rising temperatures on biogenic volatile emissions in the Arctic. / Rinnan, Riikka; Iversen, Lars L.; Tang, Jing; Vedel-Petersen, Ida; Schollert, Michelle; Schurgers, Guy.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, No. 51, 2020, p. 32476-32483.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Separating direct and indirect effects of rising temperatures on biogenic volatile emissions in the Arctic
AU - Rinnan, Riikka
AU - Iversen, Lars L.
AU - Tang, Jing
AU - Vedel-Petersen, Ida
AU - Schollert, Michelle
AU - Schurgers, Guy
N1 - CENPERMOA[2020]
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - Climate change
KW - Ecosystem modelling
KW - Ecosystem-atmosphere interactions
KW - Vegetation change
U2 - 10.1073/pnas.2008901117
DO - 10.1073/pnas.2008901117
M3 - Journal article
C2 - 33257556
AN - SCOPUS:85098194801
VL - 117
SP - 32476
EP - 32483
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 51
ER -
ID: 255066080