Temporal and spatial differences of methane flux at arctic tundra in Alaska
2006; National Institute of Polar Research; Volume: 59; Linguagem: Inglês
ISSN
0386-0744
AutoresYoshinobu Harazono, Masayoshi Mano, Akira Miyata, Mayumi Yoshimoto, R. C. Zulueta, George L. Vourlitis, Hyojung Kwon, Walter C. Oechel,
Tópico(s)Atmospheric and Environmental Gas Dynamics
ResumoHigh latitude ecosystems were thought to enhance CH. emission in relation to the current arctic warming. However, we have little information about this potential feedback mechanisms on climate change, thus, model parameterization is insu$cient and the observational data are required. We observed CH. flux at several types of tundra in Alaska over the growing seasons since +33/. From these observed data, we examined current CH. emission and its controlling factors on Alaskan tundra. Then we discussed about spatial and temporal di#erences in CH. flux. Daily trend of half hourly CH. flux had little relation with soil temperature, but the seasonal trend of daily flux changed with soil or water temperature. Cumulative CH. fluxes during the growing seasons were 2.+ gCH.m , on wet sedge tundra at Happy Valley in +33/, -.gCH.m , on non-acidic moist tundra in +330, and -./2 2.,. gCH.m , on wet sedge tundra at Barrow between +333 ,**-. Non-acidic tundra had low CH. emission with low CO, accumulation. There was large spatial di#erence in CH. flux caused by tundra type, and the large temporal di#erence at the wet sedge tundra reflected yearly weather variability. key words: Arctic ecosystem, CH. flux, temporal and spatial variability, tundra, warming climate
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