期刊
POLAR RESEARCH
卷 30, 期 -, 页码 -出版社
OPEN ACADEMIA AB
DOI: 10.3402/polar.v30i0.14555
关键词
Water pulse; climate change; polar desert; International Polar Year; discrete warming events; soil biogeochemistry
资金
- Research Council of Norway
- Dickey Center for International Understanding and its Institute of Arctic Studies at Dartmouth College
- National Science Foundation [ANT-0423595]
The McMurdo Dry Valleys are one of the most arid environments on Earth. Over the soil landscape for the majority of the year, biological and ecosystem processes in the dry valleys are constrained by the low temperatures and limited availability of water. The prevalence of these physical limitations in controlling biological and ecosystem processes makes the dry valleys a climate-sensitive system, poised to experience substantial changes following projected future warming. Short-duration increases in summer temperatures are associated with pulses of water from melting ice reserves, including glaciers, snow and permafrost. Such pulses alter soil geochemistry by mobilizing and redistributing soil salts (via enhanced weathering, solubility and mobility), which can alter habitat suitability for soil organisms. Resulting changes in soil community composition or distribution may alter the biogeochemical processes in which they take part. Here, we review the potential impacts of meltwater pulses and present new field data documenting instances of meltwater pulse events that result from different water sources and hydrological patterns, and discuss their potential influence on soil biology and biogeochemistry. We use these examples to discuss the potential impacts of future climate change on the McMurdo Dry Valley soil ecosystem.
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