https://scholars.lib.ntu.edu.tw/handle/123456789/572771
標題: | Lessons learned from more than a decade of greenhouse gas flux measurements at boreal forests in eastern Siberia and interior Alaska | 作者: | Hiyama T Ueyama M Kotani A Iwata H TARO NAKAI Okamura M Ohta T Harazono Y Petrov R.E Maximov T.C. |
關鍵字: | boreal forest; carbon dioxide; climate change; greenhouse gas; methane; monitoring system; thermokarst; top-down approach; uncertainty analysis; Alaska; Siberia; United States | 公開日期: | 2021 | 卷: | 27 | 來源出版物: | Polar Science | 摘要: | We summarized our recently-published papers on greenhouse gas exchanges at two important boreal regions underlain by permafrost: eastern Siberia and interior Alaska. Relevant literatures were also referred to, and future research directions on the high-latitude terrestrial processes were suggested. Long-term monitoring of CO2 fluxes at the boreal forests revealed that anomalous weather and disturbances changed the CO2 balance. More than a decade is required to return to a CO2 sink at burned forests in interior Alaska. Anomalous high precipitation altered the forest structure in eastern Siberia, shifting the overstory/understory contributions to the CO2 balance. The CH4 emissions were higher in the two boreal forests than in the other boreal forests. Upscaling the in-situ observations and comparisons with top-down approaches revealed considerable inconsistencies exist among the approaches. We recommend the following directions in future research. First, long-term monitoring is indispensable to detect the effect of climate change on ecosystems. Second, disturbance impacts, including fire, thermokarst, and wet spells, need to be quantified. Third, further observations are necessary for constraining CH4 exchange models. Finally, reconciling top-down and bottom-up approaches is required to reduce uncertainty. Prompt sharing of observed data and model products is crucial to improve our understanding of high-latitude processes. ? 2020 The Authors |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096837675&doi=10.1016%2fj.polar.2020.100607&partnerID=40&md5=243c544ea7f9a3c89574a8044dc0373a https://scholars.lib.ntu.edu.tw/handle/123456789/572771 |
ISSN: | 18739652 | DOI: | 10.1016/j.polar.2020.100607 | SDG/關鍵字: | boreal forest; carbon dioxide; climate change; greenhouse gas; methane; monitoring system; thermokarst; top-down approach; uncertainty analysis; Alaska; Siberia; United States |
顯示於: | 森林環境暨資源學系 |
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