On the variation of regional CO2 exchange over temperate and boreal North America

Xia Zhang, Kevin Gurney, Philippe Peylin, Frédéric Chevallier, Rachel M. Law, Prabir K. Patra, Peter J. Rayner, Christian Röedenbeck, Maarten Krol

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Inverse-estimated net carbon exchange time series spanning two decades for six North American regions are analyzed to examine long-term trends and relationships to temperature and precipitation variations. Results reveal intensification of carbon uptake in eastern boreal North America (0.1 PgC/decade) and the Midwest United States (0.08 PgC/decade). Seasonal cross-correlation analysis shows a significant relationship between net carbon exchange and temperature/precipitation anomalies during the western United States growing season with warmer, dryer conditions leading reduced carbon uptake. This relationship is consistent with "global change-type drought" dynamics which drive increased vegetation mortality, increases in dry woody material, and increased wildfire occurrence. This finding supports the contention that future climate change may increase carbon loss in this region. Similarly, higher temperatures and reduced precipitation are accompanied by decreased net carbon uptake in the Midwestern United States toward the end of the growing season. Additionally, intensified net carbon uptake during the eastern boreal North America growing season is led by increased precipitation anomalies in the previous year, suggesting the influence of "climate memory" carried by regional snowmelt water. The two regions of boreal North America exhibit opposing seasonal carbon-temperature relationships with the eastern half experiencing a net carbon loss with near coincident increases in temperature and the western half showing increased net carbon uptake. The carbon response in the boreal west region lags the temperature anomalies by roughly 6 months. This opposing carbon-temperature relationship in boreal North America may be a combination of different dominant vegetation types, the amount and timing of snowfall, and temperature anomaly differences across boreal North America. Key Points Quantify relationship between C fluxes and climate variables Robust relationships between carbon and temperature and precipitation Opposing carbon-tempeature relationship in boearl regions

Original languageEnglish (US)
Pages (from-to)991-1000
Number of pages10
JournalGlobal Biogeochemical Cycles
Volume27
Issue number4
DOIs
StatePublished - Dec 2013

Fingerprint

Carbon
carbon
Temperature
growing season
temperature
North America
temperature anomaly
anomaly
Drought
climate
Snow
snowmelt
wildfire
Climate change
global change
vegetation type
Time series
drought
time series
Fluxes

Keywords

  • carbon cycle
  • carbon feedback
  • carbon-climate relationship
  • climate change
  • CO2 inversion
  • global change-type drought

ASJC Scopus subject areas

  • Global and Planetary Change
  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Zhang, X., Gurney, K., Peylin, P., Chevallier, F., Law, R. M., Patra, P. K., ... Krol, M. (2013). On the variation of regional CO2 exchange over temperate and boreal North America. Global Biogeochemical Cycles, 27(4), 991-1000. https://doi.org/10.1002/gbc.20091

On the variation of regional CO2 exchange over temperate and boreal North America. / Zhang, Xia; Gurney, Kevin; Peylin, Philippe; Chevallier, Frédéric; Law, Rachel M.; Patra, Prabir K.; Rayner, Peter J.; Röedenbeck, Christian; Krol, Maarten.

In: Global Biogeochemical Cycles, Vol. 27, No. 4, 12.2013, p. 991-1000.

Research output: Contribution to journalArticle

Zhang, X, Gurney, K, Peylin, P, Chevallier, F, Law, RM, Patra, PK, Rayner, PJ, Röedenbeck, C & Krol, M 2013, 'On the variation of regional CO2 exchange over temperate and boreal North America', Global Biogeochemical Cycles, vol. 27, no. 4, pp. 991-1000. https://doi.org/10.1002/gbc.20091
Zhang X, Gurney K, Peylin P, Chevallier F, Law RM, Patra PK et al. On the variation of regional CO2 exchange over temperate and boreal North America. Global Biogeochemical Cycles. 2013 Dec;27(4):991-1000. https://doi.org/10.1002/gbc.20091
Zhang, Xia ; Gurney, Kevin ; Peylin, Philippe ; Chevallier, Frédéric ; Law, Rachel M. ; Patra, Prabir K. ; Rayner, Peter J. ; Röedenbeck, Christian ; Krol, Maarten. / On the variation of regional CO2 exchange over temperate and boreal North America. In: Global Biogeochemical Cycles. 2013 ; Vol. 27, No. 4. pp. 991-1000.
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