气候变化领域集成服务门户(CCPortal): Cooling and Moistening of the Planetary Boundary Layer in Interior Alaska Due to a Postfire Change in Surface Energy Exchange

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DOI	10.1029/2020JD032968
	Cooling and Moistening of the Planetary Boundary Layer in Interior Alaska Due to a Postfire Change in Surface Energy Exchange
	Ueyama M.; Yamamori T.; Iwata H.; Harazono Y.
发表日期	2020
ISSN	2169897X
卷号	125 期号:18
英文摘要	Boreal forest fires can alter the surface energy exchange due to postfire land cover change, which influences the regional climate through changes in scalar budgets within the planetary boundary layer (PBL). In this study, we estimated the changes in potential temperature and moisture budgets within the convective boundary layer (CBL) associated with postfire changes in surface energy exchange in interior Alaska. We integrated 9 years of paired eddy covariance measurements at mature evergreen and postfire young forests, radiosonde observations, and a mixed-layer slab model. The postfire increase in albedo and decreased Bowen ratio decreased the sensible heat flux and PBL height, resulting in cooling magnitudes in the CBL up to 3–5°C in spring months and smaller cooling magnitudes (0.4°C) in other months. The cooling in the CBL decreased at a rate 0.5°C yr−1 from 8 to 13 years after the fire via vegetation recovery but was still recognizable 13 years after the fire. The postfire change moistened the CBL in summer months due to the decreased PBL height and increased latent heat flux in the postfire young forest. Interactions between fire-induced surface changes and PBL dynamics should be evaluated further for understanding long-term climatic change and ecosystem responses to climate change. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	boreal forest; cooling; eddy covariance; forest fire; interior Alaska; planetary boundary layer
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185771
作者单位	Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Japan; Department of Environmental Science, Faculty of Science, Shinshu University, Matsumoto, Japan
推荐引用方式 GB/T 7714	Ueyama M.,Yamamori T.,Iwata H.,et al. Cooling and Moistening of the Planetary Boundary Layer in Interior Alaska Due to a Postfire Change in Surface Energy Exchange[J],2020,125(18).
APA	Ueyama M.,Yamamori T.,Iwata H.,&Harazono Y..(2020).Cooling and Moistening of the Planetary Boundary Layer in Interior Alaska Due to a Postfire Change in Surface Energy Exchange.Journal of Geophysical Research: Atmospheres,125(18).
MLA	Ueyama M.,et al."Cooling and Moistening of the Planetary Boundary Layer in Interior Alaska Due to a Postfire Change in Surface Energy Exchange".Journal of Geophysical Research: Atmospheres 125.18(2020).