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Increases in Land Surface Temperature in Response to Fire in Siberian Boreal Forests and Their Attribution to Biophysical Processes
Liu, Zhihua1,2; Ballantyne, Ashley P.1; Cooper, L. Annie1
Corresponding AuthorLiu, Zhihua(liuzh811@126.com)
2018-07-16
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume45Issue:13Pages:6485-6494
AbstractWildfire 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.
Keywordland surface temperature boreal fire climate remote sensing forest disturbance
Funding OrganizationNSF ; NSFC ; CAS Pioneer Hundred Talents Program ; NASA Earth and Space Science Fellowship
DOI10.1029/2018GL078283
Indexed BySCI
Language英语
Funding ProjectNSF[1550932] ; NSFC[31470517] ; CAS Pioneer Hundred Talents Program ; NASA Earth and Space Science Fellowship[NNX15AN16H]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000439784300018
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128838
Collection中国科学院金属研究所
Corresponding AuthorLiu, Zhihua
Affiliation1.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
Recommended Citation
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.
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