globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13320
论文题名:
Cold air drainage flows subsidize montane valley ecosystem productivity
作者: Novick K.A.; Oishi A.C.; Miniat C.F.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:12
起始页码: 4014
结束页码: 4027
语种: 英语
英文关键词: complex terrain ; drainage flows ; drought ; ecosystem respiration ; gross ecosystem productivity ; microclimate ; net ecosystem exchange ; net ecosystem productivity
Scopus关键词: aboveground biomass ; carbon flux ; climate change ; cold air ; complex terrain ; drought ; microclimate ; mountain environment ; net ecosystem exchange ; net ecosystem production ; respiration ; Appalachians ; carbon dioxide ; carbon cycle ; cold ; ecosystem ; microclimate ; tree ; United States ; Appalachian Region ; Carbon Cycle ; Carbon Dioxide ; Cold Temperature ; Ecosystem ; Microclimate ; Trees
英文摘要: In mountainous areas, cold air drainage from high to low elevations has pronounced effects on local temperature, which is a critical driver of many ecosystem processes, including carbon uptake and storage. Here, we leverage new approaches for interpreting ecosystem carbon flux observations in complex terrain to quantify the links between macro-climate condition, drainage flows, local microclimate, and ecosystem carbon cycling in a southern Appalachian valley. Data from multiple long-running climate stations and multiple eddy covariance flux towers are combined with simple models for ecosystem carbon fluxes. We show that cold air drainage into the valley suppresses local temperature by several degrees at night and for several hours before and after sunset, leading to reductions in growing season respiration on the order of ~8%. As a result, we estimate that drainage flows increase growing season and annual net carbon uptake in the valley by >10% and >15%, respectively, via effects on microclimate that are not be adequately represented in regional- and global-scale terrestrial ecosystem models. Analyses driven by chamber-based estimates of soil and plant respiration reveal cold air drainage effects on ecosystem respiration are dominated by reductions to the respiration of aboveground biomass. We further show that cold air drainage proceeds more readily when cloud cover and humidity are low, resulting in the greatest enhancements to net carbon uptake in the valley under clear, cloud-free (i.e., drought-like) conditions. This is a counterintuitive result that is neither observed nor predicted outside of the valley, where nocturnal temperature and respiration increase during dry periods. This result should motivate efforts to explore how topographic flows may buffer eco-physiological processes from macroscale climate change. © 2016 John Wiley & Sons Ltd
资助项目: The authors thank C. Sobek and S. Laseter for assistance with data collection and archiving, and P. Bolstad for providing valuable feedback on an early version of the manuscript. We thank W. Swank, J. Vose, L. Swift, and many other Coweeta Hydrologic Laboratory scientists for the dedicated efforts to support the long-term operation of the climate stations and the installation of the Coweeta Hydrologic Lab flux tower. Funding for the work was provided by the USDA Forest Service Southern Research Station and the NSF Long-Term Ecological Research (LTER) program (DEB-0823293 and DEB-1440485). We are grateful for the data provided by the NC CHRONOS database, a product of the State Climate Office of North Carolina, and for the data provided by the US Climate Reference Network, which is managed and maintained by the National Oceanic and Atmospheric Administration's (NOAA) National Centers for Environmental Information. The authors state they have no financial conflict of interest in the results of this study.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61253
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Public and Environmental Affairs, Indiana University – Bloomington, 702 N. Walnut Grove Avenue, Bloomington, IN, United States; USDA Forest Service – Southern Research Station, Coweeta Hydrologic Laboratory, 3160 Coweeta Lab Road, Otto, NC, United States

Recommended Citation:
Novick K.A.,Oishi A.C.,Miniat C.F.. Cold air drainage flows subsidize montane valley ecosystem productivity[J]. Global Change Biology,2016-01-01,22(12)
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