Autumn warming reduces the CO2sink of a black spruce forest in interior Alaska based on a nine-year eddy covariance measurement

2014 ◽  
Vol 20 (4) ◽  
pp. 1161-1173 ◽  
Author(s):  
Masahito Ueyama ◽  
Hiroki Iwata ◽  
Yoshinobu Harazono
Keyword(s):  
Eddy Covariance ◽  
Black Spruce ◽  
Spruce Forest ◽  
Interior Alaska ◽  
Eddy Covariance Measurement

scholarly journals Environmental factors regulating winter CO<sub>2</sub> flux in snow-covered boreal forest soil, interior Alaska

2012 ◽  
Vol 9 (1) ◽  
pp. 1129-1159 ◽  
Author(s):  
Y. Kim ◽  
Y. Kodama
Keyword(s):  
Environmental Factors ◽  
Soil Temperature ◽  
Forest Soil ◽  
Atmospheric Pressure ◽  
Co2 Emission ◽  
Black Spruce ◽  
Co2 Flux ◽  
Atmospheric Temperature ◽  
Spruce Forest ◽  
Interior Alaska

Abstract. Winter CO2 flux is an important element to assess when estimating the annual carbon budget on regional and global scales. However, winter observation frequency is limited due to the extreme cold weather in sub-Arctic and Arctic ecosystems. In this study, the continuous monitoring of winter CO2 flux in black spruce forest soil of interior Alaska was performed using NDIR CO2 sensors at 10, 20, and 30 cm above the soil surface during the snow-covered period (DOY 357 to 466) of 2006/2007. The atmospheric pressure was divided into four phases: >1000 hPa (HP: high pressure); 985<P<1000 (IP: intermediate pressure); <986 hPa (LP: low pressure); and a snow-melting period (MP); for the quantification of the effect of the environmental factors determining winter CO2 flux. The winter CO2 fluxes were 0.22 ± 0.02, 0.23 ± 0.02, 0.25 ± 0.03, and 0.17 ± 0.02 gCO2-C/m2 d−1 for the HP, IP, LP, and MP phases, respectively. Wintertime CO2 emission represents 20 % of the annual CO2 emissions in this boreal black spruce forest soil. Atmospheric temperature, pressure, and soil temperature correlate at levels of 56, 25, and 31 % to winter CO2 flux, respectively, during the snow-covered period of 2006/2007, when snow depth experienced one of its lowest totals of the past 80 years. Atmospheric temperature and soil temperature at 5 cm depth, modulated by atmospheric pressure, were found to be significant factors in determining winter CO2 emission and fluctuation in snowpack. Regional/global process-based carbon cycle models should be reassessed to account for the effect of winter CO2 emissions, regulated by temperature and soil latent-heat flux, in the snow-covered soils of Arctic and sub-Arctic terrestrial ecosystems of the Northern Hemisphere.

scholarly journals Characteristics of evapotranspiration from a permafrost black spruce forest in interior Alaska

Polar Science ◽  
2013 ◽  
Vol 7 (2) ◽  
pp. 136-148 ◽  
Author(s):  
Taro Nakai ◽  
Yongwon Kim ◽  
Robert C. Busey ◽  
Rikie Suzuki ◽  
Shin Nagai ◽  
...  
Keyword(s):  
Black Spruce ◽  
Spruce Forest ◽  
Interior Alaska

scholarly journals Carbon exchange rates in Polytrichum juniperinum moss of burned black spruce forest in interior Alaska

Polar Science ◽  
2014 ◽  
Vol 8 (2) ◽  
pp. 146-155 ◽  
Author(s):  
Yongwon Kim ◽  
Yuji Kodama ◽  
Changsub Shim ◽  
Keiji Kushida
Keyword(s):  
Exchange Rates ◽  
Black Spruce ◽  
Spruce Forest ◽  
Carbon Exchange ◽  
Interior Alaska

Controlling factors on the interannual CO2 budget at a subarctic black spruce forest in interior Alaska

Tellus B ◽  
2006 ◽  
Vol 58 (5) ◽  
pp. 491-501 ◽  
Author(s):  
Masahito Ueyama ◽  
Yoshinobu Harazono ◽  
Eiji Ohtaki ◽  
Akira Miyata
Keyword(s):  
Black Spruce ◽  
Controlling Factors ◽  
Spruce Forest ◽  
Interior Alaska
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