Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath
The Arctic is warming at twice the global average speed, and the warming-induced increases in biogenic volatile organic compounds (BVOCs) emissions from Arctic plants are expected to be drastic. The current global models' estimations of minimal BVOC emissions from the Arctic are based on very f...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-12-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/13/6651/2016/bg-13-6651-2016.pdf |
| _version_ | 1818929720653250560 |
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| author | J. Tang G. Schurgers H. Valolahti P. Faubert P. Tiiva A. Michelsen R. Rinnan |
| author_facet | J. Tang G. Schurgers H. Valolahti P. Faubert P. Tiiva A. Michelsen R. Rinnan |
| author_sort | J. Tang |
| collection | DOAJ |
| description | The Arctic is warming at twice the global average speed, and the
warming-induced increases in biogenic volatile organic compounds (BVOCs)
emissions from Arctic plants are expected to be drastic. The current global
models' estimations of minimal BVOC emissions from the Arctic are based on
very few observations and have been challenged increasingly by field data.
This study applied a dynamic ecosystem model, LPJ-GUESS, as a platform to
investigate short-term and long-term BVOC emission responses to Arctic
climate warming. Field observations in a subarctic tundra heath with
long-term (13-year) warming treatments were extensively used for
parameterizing and evaluating BVOC-related processes (photosynthesis,
emission responses to temperature and vegetation composition). We propose an
adjusted temperature (<i>T</i>) response curve for Arctic plants with much
stronger <i>T</i> sensitivity than the commonly used algorithms for large-scale
modelling. The simulated emission responses to 2 °C warming between
the adjusted and original <i>T</i> response curves were evaluated against the
observed warming responses (WRs) at short-term scales. Moreover, the model
responses to warming by 4 and 8 °C were also investigated as a
sensitivity test. The model showed reasonable agreement to the observed
vegetation CO<sub>2</sub> fluxes in the main growing season as well as day-to-day
variability of isoprene and monoterpene emissions. The observed relatively
high WRs were better captured by the adjusted <i>T</i> response curve than by the
common one. During 1999–2012, the modelled annual mean isoprene and
monoterpene emissions were 20 and 8 mg C m<sup>−2</sup> yr<sup>−1</sup>, with an
increase by 55 and 57 % for 2 °C summertime warming,
respectively. Warming by 4 and 8 °C for the same period further
elevated isoprene emission for all years, but the impacts on monoterpene
emissions levelled off during the last few years.
<br><br>
At hour-day scale, the WRs seem to be strongly impacted by canopy air <i>T</i>,
while at the day–year scale, the WRs are a combined effect of plant functional
type (PFT) dynamics and instantaneous BVOC responses to warming. The
identified challenges in estimating Arctic BVOC emissions are (1) correct
leaf <i>T</i> estimation, (2) PFT parameterization accounting for plant emission
features as well as physiological responses to warming, and
(3) representation of long-term vegetation changes in the past and the
future. |
| first_indexed | 2024-12-20T03:49:17Z |
| format | Article |
| id | doaj.art-6024785992b04576983b4640fb0bdc2d |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-20T03:49:17Z |
| publishDate | 2016-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-6024785992b04576983b4640fb0bdc2d2022-12-21T19:54:31ZengCopernicus PublicationsBiogeosciences1726-41701726-41892016-12-0113246651666710.5194/bg-13-6651-2016Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heathJ. Tang0G. Schurgers1H. Valolahti2P. Faubert3P. Tiiva4A. Michelsen5R. Rinnan6Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, DenmarkCenter for Permafrost, University of Copenhagen, Copenhagen, DenmarkTerrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, DenmarkChaire en éco-conseil, Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Québec, CanadaDepartment of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, FinlandTerrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, DenmarkTerrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, DenmarkThe Arctic is warming at twice the global average speed, and the warming-induced increases in biogenic volatile organic compounds (BVOCs) emissions from Arctic plants are expected to be drastic. The current global models' estimations of minimal BVOC emissions from the Arctic are based on very few observations and have been challenged increasingly by field data. This study applied a dynamic ecosystem model, LPJ-GUESS, as a platform to investigate short-term and long-term BVOC emission responses to Arctic climate warming. Field observations in a subarctic tundra heath with long-term (13-year) warming treatments were extensively used for parameterizing and evaluating BVOC-related processes (photosynthesis, emission responses to temperature and vegetation composition). We propose an adjusted temperature (<i>T</i>) response curve for Arctic plants with much stronger <i>T</i> sensitivity than the commonly used algorithms for large-scale modelling. The simulated emission responses to 2 °C warming between the adjusted and original <i>T</i> response curves were evaluated against the observed warming responses (WRs) at short-term scales. Moreover, the model responses to warming by 4 and 8 °C were also investigated as a sensitivity test. The model showed reasonable agreement to the observed vegetation CO<sub>2</sub> fluxes in the main growing season as well as day-to-day variability of isoprene and monoterpene emissions. The observed relatively high WRs were better captured by the adjusted <i>T</i> response curve than by the common one. During 1999–2012, the modelled annual mean isoprene and monoterpene emissions were 20 and 8 mg C m<sup>−2</sup> yr<sup>−1</sup>, with an increase by 55 and 57 % for 2 °C summertime warming, respectively. Warming by 4 and 8 °C for the same period further elevated isoprene emission for all years, but the impacts on monoterpene emissions levelled off during the last few years. <br><br> At hour-day scale, the WRs seem to be strongly impacted by canopy air <i>T</i>, while at the day–year scale, the WRs are a combined effect of plant functional type (PFT) dynamics and instantaneous BVOC responses to warming. The identified challenges in estimating Arctic BVOC emissions are (1) correct leaf <i>T</i> estimation, (2) PFT parameterization accounting for plant emission features as well as physiological responses to warming, and (3) representation of long-term vegetation changes in the past and the future.http://www.biogeosciences.net/13/6651/2016/bg-13-6651-2016.pdf |
| spellingShingle | J. Tang G. Schurgers H. Valolahti P. Faubert P. Tiiva A. Michelsen R. Rinnan Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath Biogeosciences |
| title | Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath |
| title_full | Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath |
| title_fullStr | Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath |
| title_full_unstemmed | Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath |
| title_short | Challenges in modelling isoprene and monoterpene emission dynamics of Arctic plants: a case study from a subarctic tundra heath |
| title_sort | challenges in modelling isoprene and monoterpene emission dynamics of arctic plants a case study from a subarctic tundra heath |
| url | http://www.biogeosciences.net/13/6651/2016/bg-13-6651-2016.pdf |
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