Abstract
Energy, water, and greenhouse gas exchange in the permafrost zone play an important role in the regional and global climate system at multiple temporal and spatial scales. High-latitude warming in recent years has substantially altered ecosystem function, including biosphere–atmosphere interaction, which may amplify or dampen future high-latitude warming through a variety of feedback processes. In this chapter, we have reviewed the current state of energy, water, CO2, and CH4 exchange at the northern high-latitude permafrost zone, with synthesizing observed micrometeorological fluxes. Tundra has a higher summer and winter albedo with a longer snow period than boreal forests, resulting in that tundra less transfers sensible and latent energy to the atmosphere. Growing season length determines the spatial variability of the annual gross primary productivity and net growing season CO2 sink. In contrast, interannual variabilities of the annual CO2 budget at boreal forests are determined by ecosystem respiration, indicating an importance of ecosystem respiration in the boreal forests. The CO2 fertilization effect could be an important determinant of the long-term greenhouse gas budget at sites with a near neutral CO2 budget. In terms of annual greenhouse gas budget, CH4 emission is more important than CO2 budget for both boreal forest and Arctic wet tundra. Based on this synthesis, finally, we discuss future possible directions of study to reach a better understanding of changing high-latitude ecosystems, by synthesizing tower flux measurements in Alaska and Siberia and combining these in situ measurements with remote sensing data.
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Acknowledgments
We thank Dr. K Ichii of Chiba University for providing the upscaled flux products, and Dr. T Hiyama of Nagoya University for discussion about water budget. We thank Dr. Y Harazono of Osaka Prefecture University, Dr. AV Rocha of University of Notre Dame, Dr. J Randerson of University of California, Irvine, for providing eddy covariance data at Alaska. We thank Dr. Y Matsuura of Forestry and Forest Products Research Institute, and Dr. H Dolman of Vrije Universiteit Amsterdam, for providing eddy covariance data at Siberia. Eddy flux data at Council were observed by Dr. J Beringer of University of Western Australia, FS Chapin III and C Copass-Thompson of the University of Alaska Fairbanks, and provided through the NCAR Earth Observing Laboratory. Databases of eddy covariance measurements (AsiaFlux, European Fluxes Database Cluster, the NSF Arctic Observatory Network, and NSF Arctic Data Center) facilitated this study. The US-Uaf site were supported by the Arctic Challenge for Sustainability (ArCS) project awarded to MU. The Barrow, and Atqasuk eddy covariance towers were supported by Office of Polar Programs of the National Science Foundation (NSF) awarded to DZ, and WCO (award number 1204263, and 1702797) with additional logistical support funded by the NSF Office of Polar Programs, and by the Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE), an Earth Ventures (EV-1) investigation, under contract with the National Aeronautics and Space Administration, and by the ABoVE (NNX15AT74A; NNX16AF94A).
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Ueyama, M. et al. (2021). Greenhouse Gases and Energy Fluxes at Permafrost Zone. In: Yang, D., Kane, D.L. (eds) Arctic Hydrology, Permafrost and Ecosystems. Springer, Cham. https://doi.org/10.1007/978-3-030-50930-9_18
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