globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14283
Scopus记录号: 2-s2.0-85047660466
论文题名:
Spring photosynthetic onset and net CO2 uptake in Alaska triggered by landscape thawing
作者: Parazoo N.C.; Arneth A.; Pugh T.A.M.; Smith B.; Steiner N.; Luus K.; Commane R.; Benmergui J.; Stofferahn E.; Liu J.; Rödenbeck C.; Kawa R.; Euskirchen E.; Zona D.; Arndt K.; Oechel W.; Miller C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:8
起始页码: 3416
结束页码: 3435
语种: 英语
英文关键词: boreal ; carbon cycle ; eddy covariance ; freeze–thaw ; inversion ; remote sensing ; tundra ; vegetation fluorescence
Scopus关键词: boreal forest ; carbon dioxide enrichment ; ecoregion ; evergreen forest ; freeze-thaw cycle ; net ecosystem exchange ; photosynthesis ; remote sensing ; spring (season) ; terrestrial ecosystem ; tundra ; Alaska ; United States
英文摘要: The springtime transition to regional-scale onset of photosynthesis and net ecosystem carbon uptake in boreal and tundra ecosystems are linked to the soil freeze–thaw state. We present evidence from diagnostic and inversion models constrained by satellite fluorescence and airborne CO2 from 2012 to 2014 indicating the timing and magnitude of spring carbon uptake in Alaska correlates with landscape thaw and ecoregion. Landscape thaw in boreal forests typically occurs in late April (DOY 111 ± 7) with a 29 ± 6 day lag until photosynthetic onset. North Slope tundra thaws 3 weeks later (DOY 133 ± 5) but experiences only a 20 ± 5 day lag until photosynthetic onset. These time lag differences reflect efficient cold season adaptation in tundra shrub and the longer dehardening period for boreal evergreens. Despite the short transition from thaw to photosynthetic onset in tundra, synchrony of tundra respiration with snow melt and landscape thaw delays the transition from net carbon loss (at photosynthetic onset) to net uptake by 13 ± 7 days, thus reducing the tundra net carbon uptake period. Two global CO2 inversions using a CASA-GFED model prior estimate earlier northern high latitude net carbon uptake compared to our regional inversion, which we attribute to (i) early photosynthetic-onset model prior bias, (ii) inverse method (scaling factor + optimization window), and (iii) sparsity of available Alaskan CO2 observations. Another global inversion with zero prior estimates the same timing for net carbon uptake as the regional model but smaller seasonal amplitude. The analysis of Alaskan eddy covariance observations confirms regional scale findings for tundra, but indicates that photosynthesis and net carbon uptake occur up to 1 month earlier in evergreens than captured by models or CO2 inversions, with better correlation to above-freezing air temperature than date of primary thaw. Further collection and analysis of boreal evergreen species over multiple years and at additional subarctic flux towers are critically needed. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110298
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA, United States; Institute of Meteorology and Climate Research (IMK-IFU), Karlsruhe Institute of Technology, Garmisch-Pertenkirchen, Germany; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Birmingham Institute of Forest Research, University of Birmingham, Birmingham, United Kingdom; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Department of Earth and Atmospheric Sciences, The City College of New York, New York, NY, United States; Centre for Applied Data Analytics, Dublin, Ireland; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Conservation Science Partners, Truckee, CA, United States; Max Plank Institute for Biogeochemistry, Jena, Germany; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States; Biology Department, San Diego State University, San Diego, CA, United States

Recommended Citation:
Parazoo N.C.,Arneth A.,Pugh T.A.M.,et al. Spring photosynthetic onset and net CO2 uptake in Alaska triggered by landscape thawing[J]. Global Change Biology,2018-01-01,24(8)
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