Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO3027 |
The role of microbes in snowmelt and radiative forcing on an Alaskan icefield | |
Ganey, Gerard Q.1; Loso, Michael G.1,2; Burgess, Annie Bryant3; Dial, Roman J.1 | |
2017-10-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A lack of liquid water limits life on glaciers worldwide but specialized microbes still colonize these environments. These microbes reduce surface albedo, which, in turn, could lead to warming and enhanced glacier melt. Here we present results from a replicated, controlled field experiment to quantify the impact of microbes on snowmelt in red-snow communities. Addition of nitrogen-phosphorous-potassium fertilizer increased alga cell counts nearly fourfold, to levels similar to nitrogen-phosphorus-enriched lakes; water alone increased counts by half. The manipulated alga abundance explained a third of the observed variability in snowmelt. Using a normalized-difference spectral index we estimated alga abundance from satellite imagery and calculated microbial contribution to snowmelt on an icefield of 1,900 km(2). The red-snow area extended over about 700 km(2), and in this area we determined that microbial communities were responsible for 17% of the total snowmelt there. Our results support hypotheses that snow-dwelling microbes increase glacier melt directly in a bio-geophysical feedback by lowering albedo and indirectly by exposing low-albedo glacier ice. Radiative forcing due to perennial populations of microbes may match that of non-living particulates at high latitudes. Their contribution to climate warming is likely to grow with increased melt and nutrient input. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000412102200012 |
WOS关键词 | GLACIER ; ALBEDO ; ALGAE ; MELT ; COMMUNITIES ; TEMPERATURE ; FEEDBACK ; SURFACE ; MARINE ; IMPACT |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/35068 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Alaska Pacific Univ, Dept Environm Sci, Anchorage, AK 99508 USA; 2.Natl Pk Serv, Wrangell St Elias Natl Pk & Preserve, Copper Ctr, AK 99573 USA; 3.Earth Sci Informat Partners, Boulder, CO 80304 USA |
推荐引用方式 GB/T 7714 | Ganey, Gerard Q.,Loso, Michael G.,Burgess, Annie Bryant,et al. The role of microbes in snowmelt and radiative forcing on an Alaskan icefield[J]. NATURE GEOSCIENCE,2017,10(10). |
APA | Ganey, Gerard Q.,Loso, Michael G.,Burgess, Annie Bryant,&Dial, Roman J..(2017).The role of microbes in snowmelt and radiative forcing on an Alaskan icefield.NATURE GEOSCIENCE,10(10). |
MLA | Ganey, Gerard Q.,et al."The role of microbes in snowmelt and radiative forcing on an Alaskan icefield".NATURE GEOSCIENCE 10.10(2017). |
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