Model-data fusion to assess year-round CO2                                                  fluxes for an arctic heath ecosystem in West Greenland (69°N)

Wenxin Zhang; Per Erik Jansson; Charlotte Sigsgaard; Alistair McConnell; Mathilde Manon Jammet; Andreas Westergaard-Nielsen; Magnus Lund; Thomas Friborg; Anders Michelsen; Bo Elberling

doi:10.1016/j.agrformet.2019.02.021

Model-data fusion to assess year-round CO₂ fluxes for an arctic heath ecosystem in West Greenland (69°N)

Wenxin Zhang, Per Erik Jansson, Charlotte Sigsgaard, Alistair McConnell, Mathilde Manon Jammet, Andreas Westergaard-Nielsen, Magnus Lund, Thomas Friborg, Anders Michelsen, Bo Elberling^*

^*Corresponding author af dette arbejde

5 Citationer (Scopus)

Abstract

Quantifying net CO ₂ exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO ₂ budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It is still unclear to what extent arctic tundra ecosystems currently act as a CO ₂ source, sink or are in balance. This study presents year-round eddy-covariance (EC)measurements of CO ₂ fluxes for an arctic heath ecosystem on Disko Island, West Greenland (69 °N)over five years. Based on a fusion of year-round EC-derived CO ₂ fluxes, soil temperature and moisture, the process-oriented model (CoupModel)has been constrained to quantify an annual budget and characterize seasonal patterns of CO ₂ fluxes. The results show that total photosynthesis corresponds to -202 ± 20 g C m ⁻² yr ^-1 with ecosystem respiration of 167 ± 28 g C m ^-2 yr ^-1 , resulting in NEE of -35 ± 15 g C m ^-2 yr ^-1 . The respiration loss is mainly described as decomposition of near-surface litter. A year with an anomalously deep snowpack shows a threefold increase in the rate of ecosystem respiration compared to other years. Due to the high CO ₂ emissions during that winter, the annual budget results in a marked reduction in the CO ₂ sink. The seasonal patterns of photosynthesis and soil respiration were described using response functions of the forcing atmosphere and soil conditions. Snow depth, topography-related soil moisture, and growing season warmth are identified as important environmental characteristics which most influence seasonal rates of gas exchange.

Originalsprog	Engelsk
Tidsskrift	Agricultural and Forest Meteorology
Vol/bind	272-273
Sider (fra-til)	176-186
Antal sider	11
ISSN	0168-1923
DOI	https://doi.org/10.1016/j.agrformet.2019.02.021
Status	Udgivet - 2019

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10.1016/j.agrformet.2019.02.021

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Zhang, W., Jansson, P. E., Sigsgaard, C., McConnell, A., Jammet, M. M., Westergaard-Nielsen, A., Lund, M., Friborg, T., Michelsen, A., & Elberling, B. (2019). Model-data fusion to assess year-round CO₂ fluxes for an arctic heath ecosystem in West Greenland (69°N). Agricultural and Forest Meteorology, 272-273, 176-186. https://doi.org/10.1016/j.agrformet.2019.02.021

Model-data fusion to assess year-round CO₂ fluxes for an arctic heath ecosystem in West Greenland (69°N). / Zhang, Wenxin; Jansson, Per Erik; Sigsgaard, Charlotte et al.
I: Agricultural and Forest Meteorology, Bind 272-273, 2019, s. 176-186.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

Zhang, W, Jansson, PE, Sigsgaard, C, McConnell, A, Jammet, MM, Westergaard-Nielsen, A, Lund, M, Friborg, T , Michelsen, A & Elberling, B 2019, 'Model-data fusion to assess year-round CO₂ fluxes for an arctic heath ecosystem in West Greenland (69°N)', Agricultural and Forest Meteorology, bind 272-273, s. 176-186. https://doi.org/10.1016/j.agrformet.2019.02.021

@article{1c8cd167fadc45f5889bf7609950eb53,

title = "Model-data fusion to assess year-round CO2 fluxes for an arctic heath ecosystem in West Greenland (69°N)",

abstract = " Quantifying net CO 2 exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO 2 budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It is still unclear to what extent arctic tundra ecosystems currently act as a CO 2 source, sink or are in balance. This study presents year-round eddy-covariance (EC)measurements of CO 2 fluxes for an arctic heath ecosystem on Disko Island, West Greenland (69 °N)over five years. Based on a fusion of year-round EC-derived CO 2 fluxes, soil temperature and moisture, the process-oriented model (CoupModel)has been constrained to quantify an annual budget and characterize seasonal patterns of CO 2 fluxes. The results show that total photosynthesis corresponds to -202 ± 20 g C m −2 yr -1 with ecosystem respiration of 167 ± 28 g C m -2 yr -1 , resulting in NEE of -35 ± 15 g C m -2 yr -1 . The respiration loss is mainly described as decomposition of near-surface litter. A year with an anomalously deep snowpack shows a threefold increase in the rate of ecosystem respiration compared to other years. Due to the high CO 2 emissions during that winter, the annual budget results in a marked reduction in the CO 2 sink. The seasonal patterns of photosynthesis and soil respiration were described using response functions of the forcing atmosphere and soil conditions. Snow depth, topography-related soil moisture, and growing season warmth are identified as important environmental characteristics which most influence seasonal rates of gas exchange. ",

keywords = "Arctic tundra, Carbon budget, CoupModel, Eddy covariance, Net ecosystem exchange, Year-round measurements",

author = "Wenxin Zhang and Jansson, {Per Erik} and Charlotte Sigsgaard and Alistair McConnell and Jammet, {Mathilde Manon} and Andreas Westergaard-Nielsen and Magnus Lund and Thomas Friborg and Anders Michelsen and Bo Elberling",

note = "CENPERM[2019]",

year = "2019",

doi = "10.1016/j.agrformet.2019.02.021",

language = "English",

volume = "272-273",

pages = "176--186",

journal = "Agricultural and Forest Meteorology",

issn = "0168-1923",

publisher = "Elsevier",

}

TY - JOUR

T1 - Model-data fusion to assess year-round CO2 fluxes for an arctic heath ecosystem in West Greenland (69°N)

AU - Zhang, Wenxin

AU - Jansson, Per Erik

AU - Sigsgaard, Charlotte

AU - McConnell, Alistair

AU - Jammet, Mathilde Manon

AU - Westergaard-Nielsen, Andreas

AU - Lund, Magnus

AU - Friborg, Thomas

AU - Michelsen, Anders

AU - Elberling, Bo

N1 - CENPERM[2019]

PY - 2019

Y1 - 2019

N2 - Quantifying net CO 2 exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO 2 budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It is still unclear to what extent arctic tundra ecosystems currently act as a CO 2 source, sink or are in balance. This study presents year-round eddy-covariance (EC)measurements of CO 2 fluxes for an arctic heath ecosystem on Disko Island, West Greenland (69 °N)over five years. Based on a fusion of year-round EC-derived CO 2 fluxes, soil temperature and moisture, the process-oriented model (CoupModel)has been constrained to quantify an annual budget and characterize seasonal patterns of CO 2 fluxes. The results show that total photosynthesis corresponds to -202 ± 20 g C m −2 yr -1 with ecosystem respiration of 167 ± 28 g C m -2 yr -1 , resulting in NEE of -35 ± 15 g C m -2 yr -1 . The respiration loss is mainly described as decomposition of near-surface litter. A year with an anomalously deep snowpack shows a threefold increase in the rate of ecosystem respiration compared to other years. Due to the high CO 2 emissions during that winter, the annual budget results in a marked reduction in the CO 2 sink. The seasonal patterns of photosynthesis and soil respiration were described using response functions of the forcing atmosphere and soil conditions. Snow depth, topography-related soil moisture, and growing season warmth are identified as important environmental characteristics which most influence seasonal rates of gas exchange.

AB - Quantifying net CO 2 exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO 2 budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It is still unclear to what extent arctic tundra ecosystems currently act as a CO 2 source, sink or are in balance. This study presents year-round eddy-covariance (EC)measurements of CO 2 fluxes for an arctic heath ecosystem on Disko Island, West Greenland (69 °N)over five years. Based on a fusion of year-round EC-derived CO 2 fluxes, soil temperature and moisture, the process-oriented model (CoupModel)has been constrained to quantify an annual budget and characterize seasonal patterns of CO 2 fluxes. The results show that total photosynthesis corresponds to -202 ± 20 g C m −2 yr -1 with ecosystem respiration of 167 ± 28 g C m -2 yr -1 , resulting in NEE of -35 ± 15 g C m -2 yr -1 . The respiration loss is mainly described as decomposition of near-surface litter. A year with an anomalously deep snowpack shows a threefold increase in the rate of ecosystem respiration compared to other years. Due to the high CO 2 emissions during that winter, the annual budget results in a marked reduction in the CO 2 sink. The seasonal patterns of photosynthesis and soil respiration were described using response functions of the forcing atmosphere and soil conditions. Snow depth, topography-related soil moisture, and growing season warmth are identified as important environmental characteristics which most influence seasonal rates of gas exchange.

KW - Arctic tundra

KW - Carbon budget

KW - CoupModel

KW - Eddy covariance

KW - Net ecosystem exchange

KW - Year-round measurements

U2 - 10.1016/j.agrformet.2019.02.021

DO - 10.1016/j.agrformet.2019.02.021

M3 - Journal article

AN - SCOPUS:85064630872

SN - 0168-1923

VL - 272-273

SP - 176

EP - 186

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

ER -

Model-data fusion to assess year-round CO2 fluxes for an arctic heath ecosystem in West Greenland (69°N)

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Model-data fusion to assess year-round CO₂ fluxes for an arctic heath ecosystem in West Greenland (69°N)