Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD029908 |
Shading by Trees and Fractional Snow Cover Control the Subcanopy Radiation Budget | |
Malle, Johanna1,2; Rutter, Nick1; Mazzotti, Giulia2,3; Jonas, Tobias2 | |
2019-03-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:6页码:3195-3207 |
文章类型 | Article |
语种 | 英语 |
国家 | England; Switzerland |
英文摘要 | Radiative processes are substantially altered by the presence of forest canopies, further affecting snow energetics during wintertime. In situ measurements of subcanopy radiation can help improve process-scale understanding of these complex interactions, which are needed to further constrain and improve land surface models. In this study, a custom-made cable car was used to measure incoming and outgoing, shortwave and longwave radiation below an evergreen forest stand. Hemispherical photographs taken concurrently from the cable car measured view fractions of shaded snow, sunlit snow, and bare ground. With this setup it was possible to quantify diurnal and seasonal radiation patterns together with their potential drivers at high spatiotemporal resolution. Measurements were performed between January and May 2018, along a 48-m transect in a discontinuous needleleaf forest in the Swiss Alps. Analysis of diurnal radiation patterns revealed a strong linear relationship (R=0.94) between outgoing shortwave radiation and sunlit snow-view fraction, highlighting shading as the main control on the subcanopy shortwave radiation budget. Measurements of outgoing longwave radiation were strongly controlled by the snow cover extent, with locations of diminished snow cover showing an increase in outgoing longwave radiation of up to 60W/m(2). The subcanopy radiation budget was shown to be dominated by shortwave radiation when surrounding canopy structure and the position of the sun allowed for direct insolation of the forest floor, but longwave radiation was the dominating component in the absence of direct insolation. |
英文关键词 | forest shading subcanopy radiation budget fractional snow cover effective albedo canopy-induced longwave enhancement |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464653500021 |
WOS关键词 | INCOMING LONGWAVE RADIATION ; NADIR REFLECTANCE PRODUCTS ; LEAF-AREA INDEX ; FOREST CANOPIES ; HEMISPHERICAL PHOTOGRAPHY ; OPERATIONAL BRDF ; EFFECTIVE ALBEDO ; SURFACE ALBEDO ; MODEL ; VEGETATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181721 |
专题 | 气候变化 |
作者单位 | 1.Northumbria Univ, Dept Geog & Environm Sci, Newcastle Upon Tyne, Tyne & Wear, England; 2.WSL Inst Snow & Avalanche Res SLF, Davos, Switzerland; 3.ETH, Lab Hydraul Hydrol & Glaciol VAW, Zurich, Switzerland |
推荐引用方式 GB/T 7714 | Malle, Johanna,Rutter, Nick,Mazzotti, Giulia,et al. Shading by Trees and Fractional Snow Cover Control the Subcanopy Radiation Budget[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(6):3195-3207. |
APA | Malle, Johanna,Rutter, Nick,Mazzotti, Giulia,&Jonas, Tobias.(2019).Shading by Trees and Fractional Snow Cover Control the Subcanopy Radiation Budget.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(6),3195-3207. |
MLA | Malle, Johanna,et al."Shading by Trees and Fractional Snow Cover Control the Subcanopy Radiation Budget".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.6(2019):3195-3207. |
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