Increases in Land Surface Temperature in Response to Fire in Siberian Boreal Forests and Their Attribution to Biophysical Processes

doi:10.1029/2018GL078283

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	Increases in Land Surface Temperature in Response to Fire in Siberian Boreal Forests and Their Attribution to Biophysical Processes
	Liu, Zhihua 1,2; Ballantyne, Ashley P.1; Cooper, L. Annie 1
刊名	GEOPHYSICAL RESEARCH LETTERS
	2018-07-16
卷号	45 期号:13 页码:6485-6494
关键词	land surface temperature boreal fire climate remote sensing forest disturbance
ISSN号	0094-8276
DOI	10.1029/2018GL078283
通讯作者	Liu, Zhihua(liuzh811@126.com)
英文摘要	Wildfire is the most prevalent natural disturbance in boreal forests and impacts climate through biogeochemical (e.g., greenhouse gas emission from biomass burning) and biophysical (e.g., albedo [ET], evapotranspiration [ET], and roughness) processes. We used satellite observations to investigate the immediate (i.e., 1 year after fire) biophysical effects of fire in Siberian boreal forests. We found that boreal forest fires have a net annual warming effect (0.0728 to 0.325K) due to strong summer warming and weak winter cooling. Fires also increased the diurnal temperature range and seasonal amplitude. These effects are strongest in summer and significantly higher in evergreen than in deciduous coniferous forests. Decreases in ET contributed to warming effects in summer, and increases in contributed to cooling in winter. Our results suggest that the increase in observed land surface temperature immediately following fires in boreal ecosystems is most likely due to reduced ET leading to a strong positive feedback on the surface radiative budget. Plain Language Summary When wildfire burns forests, it affects local climate by changing the surface energy budget and distribution because of changes in albedo (alpha) and evapotranspiration (ET). Albedo (alpha) determines the solar energy absorbed by the land surface, with darker surfaces (e.g., forest) absorbing more energy than lighter surfaces (e.g., snow). ET is the energy used to release water from plant leaves and therefore cools the land surface. We used satellite observations to investigate how land surface temperature (LST) changes 1 year after wildfire and how this response relates to and ET in Siberian boreal forests. We found that burned forested areas have a higher annual LST and variability than adjacent unburned forested areas, as a result of strong summer warming and weak winter cooling. A strong decrease in summer ET is the main mechanism for the increase in LST in burned forests. Additionally, the LST response is different between boreal forest types. Our results suggest that boreal forest fires result in increased surface warming primarily due to decreases in evaporative cooling in summer.
资助项目	NSF[1550932] ; NSFC[31470517] ; CAS Pioneer Hundred Talents Program ; NASA Earth and Space Science Fellowship[NNX15AN16H]
WOS研究方向	Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000439784300018
资助机构	NSF ; NSFC ; CAS Pioneer Hundred Talents Program ; NASA Earth and Space Science Fellowship
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/128834]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu, Zhihua
作者单位	1.Univ Montana, Dept Ecosyst & Conservat Sci, Missoula, MT 59812 USA 2.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Liu, Zhihua,Ballantyne, Ashley P.,Cooper, L. Annie. Increases in Land Surface Temperature in Response to Fire in Siberian Boreal Forests and Their Attribution to Biophysical Processes[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(13):6485-6494.
APA	Liu, Zhihua,Ballantyne, Ashley P.,&Cooper, L. Annie.(2018).Increases in Land Surface Temperature in Response to Fire in Siberian Boreal Forests and Their Attribution to Biophysical Processes.GEOPHYSICAL RESEARCH LETTERS,45(13),6485-6494.
MLA	Liu, Zhihua,et al."Increases in Land Surface Temperature in Response to Fire in Siberian Boreal Forests and Their Attribution to Biophysical Processes".GEOPHYSICAL RESEARCH LETTERS 45.13(2018):6485-6494.