期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 12, 页码 6134-6144出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL073823
关键词
hillslope; soil-Carbon; permafrost; soil-transport
资金
- office of Biological and Environmental Research in the DOE Office of Science
- Argonne National Laboratory [DE-AC02-06CH11357]
Northern circumpolar permafrost soils contain more than a third of the global soil organic carbon pool (SOC). The sensitivity of this carbon pool to a changing climate is a primary source of uncertainty in simulation-based climate projections. These projections, however, do not account for the accumulation of soil deposits at the base of hillslopes (hill toes) and the influence of this accumulation on the distribution, sequestration, and decomposition of SOC in landscapes affected by permafrost. Here we combine topographic models with soil profile data and topographic analysis to evaluate the quantity and uncertainty of SOC mass stored in perennially frozen hill toe soil deposits. We show that in Alaska this SOC mass introduces an uncertainty that is > 200% the state-wide estimates of SOC stocks (77 Pg C) and that a similarly large uncertainty may also pertain at a circumpolar scale. Soil sampling and geophysical imaging efforts that target hill toe deposits can help constrain this large uncertainty.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据