Process‐Oriented Modeling of a High Arctic Tundra Ecosystem: Long‐Term Carbon Budget and Ecosystem Responses to Interannual Variations of Climate
(2018) In Journal of Geophysical Research - Biogeosciences 123(4). p.1178-1196- Abstract
- Terrestrial carbon (C) cycling in high Arctic tundra depends on ecosystem responses to
climatic warming and concurrent changes in environmental conditions. There are very few studies to
quantify long-term C budget in high Arctic tundra due to lack of sufficient measurements. Here based on
well-established multiyear measurements, we calibrated a process-oriented model (CoupModel) to quantify
various components of the C budget at a Cassiope tetragona heath ecosystem in northeast Greenland. Net
ecosystem exchange of CO
2
(NEE) for 2000–2014 was estimated at 15 ± 10 g C m
2
yr
1
. Ecosystem
respiration (ER) for nongrowing seasons was estimated at 10.3 ± 5.3 g C m
2
yr
1
,... (More) - Terrestrial carbon (C) cycling in high Arctic tundra depends on ecosystem responses to
climatic warming and concurrent changes in environmental conditions. There are very few studies to
quantify long-term C budget in high Arctic tundra due to lack of sufficient measurements. Here based on
well-established multiyear measurements, we calibrated a process-oriented model (CoupModel) to quantify
various components of the C budget at a Cassiope tetragona heath ecosystem in northeast Greenland. Net
ecosystem exchange of CO
2
(NEE) for 2000–2014 was estimated at 15 ± 10 g C m
2
yr
1
. Ecosystem
respiration (ER) for nongrowing seasons was estimated at 10.3 ± 5.3 g C m
2
yr
1
, representing around
13% of the annual ER. Significant trends for interannual variations of aboveground and belowground C fluxes
and stocks were found for the subperiods (i.e., 2000–2008 and 2008–2014) but not for the entire period.
Interannual variations of NEE largely relied on the response of gross primary production (GPP) and ER to
seasonal changes in climate. Moreover, the model showed that interannual variations of GPP, ER, and NEE
had a much higher linear correlation with July temperature and annual maximum thawing depth (ALD
max
)
than other climatic and site characteristics. ALD
max
had the highest correlation with the decomposition rate
of humus C. Overall, this modeling study suggests that a sink-source transition of the studied ecosystem
depends on ecosystem responses to interannual variations of climate and that the net C balance may be
sensitive to summer warmth and active layer thickness.
(Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/6926f5a0-5399-435c-8f6d-df200539cb1d
- author
- Zhang, Wenxin LU ; Jansson, Per-Erik ; Schurgers, Guy ; Hollesen, Jørgen ; Lund, Magnus ; Abermann, Jakob and Elberling, Bo
- organization
- publishing date
- 2018-03-07
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Geophysical Research - Biogeosciences
- volume
- 123
- issue
- 4
- pages
- 1178 - 1196
- publisher
- Wiley
- external identifiers
-
- scopus:85044852172
- ISSN
- 2169-8953
- DOI
- 10.1002%2F2017JG003956
- language
- English
- LU publication?
- no
- id
- 6926f5a0-5399-435c-8f6d-df200539cb1d
- date added to LUP
- 2018-09-22 19:26:57
- date last changed
- 2022-04-25 17:21:52
@article{6926f5a0-5399-435c-8f6d-df200539cb1d, abstract = {{Terrestrial carbon (C) cycling in high Arctic tundra depends on ecosystem responses to<br/>climatic warming and concurrent changes in environmental conditions. There are very few studies to<br/>quantify long-term C budget in high Arctic tundra due to lack of sufficient measurements. Here based on<br/>well-established multiyear measurements, we calibrated a process-oriented model (CoupModel) to quantify<br/>various components of the C budget at a Cassiope tetragona heath ecosystem in northeast Greenland. Net<br/>ecosystem exchange of CO<br/>2<br/>(NEE) for 2000–2014 was estimated at 15 ± 10 g C m<br/>2<br/>yr<br/>1<br/>. Ecosystem<br/>respiration (ER) for nongrowing seasons was estimated at 10.3 ± 5.3 g C m<br/>2<br/>yr<br/>1<br/>, representing around<br/>13% of the annual ER. Significant trends for interannual variations of aboveground and belowground C fluxes<br/>and stocks were found for the subperiods (i.e., 2000–2008 and 2008–2014) but not for the entire period.<br/>Interannual variations of NEE largely relied on the response of gross primary production (GPP) and ER to<br/>seasonal changes in climate. Moreover, the model showed that interannual variations of GPP, ER, and NEE<br/>had a much higher linear correlation with July temperature and annual maximum thawing depth (ALD<br/>max<br/>)<br/>than other climatic and site characteristics. ALD<br/>max<br/>had the highest correlation with the decomposition rate<br/>of humus C. Overall, this modeling study suggests that a sink-source transition of the studied ecosystem<br/>depends on ecosystem responses to interannual variations of climate and that the net C balance may be<br/>sensitive to summer warmth and active layer thickness.<br/>}}, author = {{Zhang, Wenxin and Jansson, Per-Erik and Schurgers, Guy and Hollesen, Jørgen and Lund, Magnus and Abermann, Jakob and Elberling, Bo}}, issn = {{2169-8953}}, language = {{eng}}, month = {{03}}, number = {{4}}, pages = {{1178--1196}}, publisher = {{Wiley}}, series = {{Journal of Geophysical Research - Biogeosciences}}, title = {{Process‐Oriented Modeling of a High Arctic Tundra Ecosystem: Long‐Term Carbon Budget and Ecosystem Responses to Interannual Variations of Climate}}, url = {{http://dx.doi.org/10.1002%2F2017JG003956}}, doi = {{10.1002%2F2017JG003956}}, volume = {{123}}, year = {{2018}}, }