Skip to Main content Skip to Navigation
Journal articles

Airborne Measurements of Surface Albedo and Leaf Area Index of Snow-Covered Boreal Forest

Abstract : Helicopter based simultaneous measurements of broadband surface albedo and the effective leaf area index (LAIeff) were carried out in subarctic area of Finnish Lapland in spring 2008, 2009, and 2010 under varying illumination and snow cover conditions. Vertical profile measurements show that the found relationship between albedo and LAIeff seems to be rather independent of the flight altitude and therefore the footprint scale. Actually, flights above 500 m in altitude revealed low variations of the surface albedo approaching an aerial average at 1 km, meaning that a footprint of 20 km is representative of the landscape. The albedo of the area was beta distributed, and without LAIeff values below 0.25, the average albedo value of the area would decrease from 0.49 to 0.44 showing the albedo sensitivity to sparse vegetation. The results agreed with the photon recollision probability based model PARAS and the MODIS satellite albedo product MCD43A3. However, differences between satellite based and airborne albedo values were noticed, which could be explained by a difference in footprint size and/or the strong local heterogeneity as certain flights were operated on specific targets.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03668295
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Saturday, May 14, 2022 - 4:18:00 PM
Last modification on : Thursday, October 6, 2022 - 1:24:22 PM

Identifiers

Citation

Terhikki Manninen, Jean-Louis Roujean, Olivier Hautecoeur, Aku Riihelä, Panu Lahtinen, et al.. Airborne Measurements of Surface Albedo and Leaf Area Index of Snow-Covered Boreal Forest. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2022, 127, ⟨10.1029/2021JD035376⟩. ⟨insu-03668295⟩

Share

Metrics

Record views

5