DOI: 10.1002/gbc.20091
Scopus记录号: 2-s2.0-84884771779
论文题名: On the variation of regional CO2 exchange over temperate and boreal North America
作者: Zhang X ; , Gurney K ; R ; , Peylin P ; , Chevallier F ; , Law R ; M ; , Patra P ; K ; , Rayner P ; J ; , Röedenbeck C ; , Krol M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 991
结束页码: 1000
语种: 英语
英文关键词: carbon cycle
; carbon feedback
; carbon-climate relationship
; climate change
; CO2 inversion
; global change-type drought
Scopus关键词: Carbon cycles
; carbon-climate relationship
; CO2 inversion
; Cross-correlation analysis
; Net carbon exchanges
; Precipitation anomalies
; Precipitation variation
; Western United States
; Carbon
; Carbon dioxide
; Drought
; Forestry
; Vegetation
; Climate change
; boreal forest
; carbon dioxide
; carbon flux
; climate change
; drought
; global change
; growing season
; high temperature
; net ecosystem exchange
; precipitation intensity
; temperate environment
; temperature anomaly
; time series
; vegetation type
; wildfire
; Midwest
; United States
英文摘要: 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 ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77554
Appears in Collections: 气候变化事实与影响
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作者单位: School of Life Sciences, Arizona State University, PO Box 874501, Tempe, AZ, United States; Laboratoire des Sciences du Climate et de l'Environment/ipsl, CEA-CNRS-UVSQ, Gif-sur-Yvette, France; Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, PMB 1, Aspendale, VIC, Australia; Earth Sciences, University of Melbourne, Melbourne, Australia; Research Institute for Global Change, JAMSTEC, Yokohama, Japan; Max Planck Institute for Biogeochemistry, Jena, Germany; Wageningen University and Research Centre, Wageningen, Netherlands
Recommended Citation:
Zhang X,, Gurney K,R,et al. On the variation of regional CO2 exchange over temperate and boreal North America[J]. Global Biogeochemical Cycles,2013-01-01,27(4)