Albedo feedbacks to future climate via climate change impacts on dryland biocrusts
AuthorRutherford, William A.
Painter, Thomas H.
Okin, Gregory S.
Reed, Sasha C.
AffiliationUniv Arizona, Sch Nat Resources & Environm
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationAlbedo feedbacks to future climate via climate change impacts on dryland biocrusts 2017, 7:44188 Scientific Reports
RightsThis work is licensed under a Creative Commons Attribution 4.0 International License.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractDrylands represent the planet's largest terrestrial biome and evidence suggests these landscapes have large potential for creating feedbacks to future climate. Recent studies also indicate that dryland ecosystems are responding markedly to climate change. Biological soil crusts (biocrusts). soil surface communities of lichens, mosses, and/or cyanobacteria. comprise up to 70% of dryland cover and help govern fundamental ecosystem functions, including soil stabilization and carbon uptake. Drylands are expected to experience significant changes in temperature and precipitation regimes, and such alterations may impact biocrust communities by promoting rapid mortality of foundational species. In turn, biocrust community shifts affect land surface cover and roughness-changes that can dramatically alter albedo. We tested this hypothesis in a full-factorial warming (+ 4 degrees C above ambient) and altered precipitation (increased frequency of 1.2 mm monsoon-type watering events) experiment on the Colorado Plateau, USA. We quantified changes in shortwave albedo via multi-angle, solar-reflectance measurements. Warming and watering treatments each led to large increases in albedo (> 30%). This increase was driven by biophysical factors related to treatment effects on cyanobacteria cover and soil surface roughness following treatment-induced moss and lichen mortality. A rise in dryland surface albedo may represent a previously unidentified feedback to future climate.
VersionFinal published version
SponsorsU.S. Department of Energy Office of Science, Office of Biological and Environmental Research Terrestrial Ecosystem Sciences Program [DESC-0008168]; U.S. Geological Survey (USGS) Youth and Education in Science (YES); USGS Ecosystems Mission Area,; National Science Foundation [EAR-1148334]
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