Ecosystem responses to climate change at a Low Arctic and a High Arctic long-term research site
Hobbie, John E.
Shaver, Gaius R.
Rastetter, Edward B.
Cherry, Jessica E.
Goetz, Scott J.
Guay, Kevin C.
Gould, William A.
Kling, George W.
MetadataShow full item record
KeywordAlaska Toolik; Climate change; Ecological effects; Greenland Zackenberg; Medium pass filter; Vegetation
Long-term measurements of ecological effects of warming are often not statistically significant because of annual variability or signal noise. These are reduced in indicators that filter or reduce the noise around the signal and allow effects of climate warming to emerge. In this way, certain indicators act as medium pass filters integrating the signal over years-to-decades. In the Alaskan Arctic, the 25-year record of warming of air temperature revealed no significant trend, yet environmental and ecological changes prove that warming is affecting the ecosystem. The useful indicators are deep permafrost temperatures, vegetation and shrub biomass, satellite measures of canopy reflectance (NDVI), and chemical measures of soil weathering. In contrast, the 18-year record in the Greenland Arctic revealed an extremely high summer air-warming of 1.3°C/decade; the cover of some plant species increased while the cover of others decreased. Useful indicators of change are NDVI and the active layer thickness.
© The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ambio 46, Supple. 1 (2017): 160-173, doi:10.1007/s13280-016-0870-x.
Suggested CitationAmbio 46, Supple. 1 (2017): 160-173
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Comiso, Josefino C.; Yang, Jiayan; Honjo, Susumu; Krishfield, Richard A. (American Geophysical Union, 2003-12-24)The decade of the 1990s was the warmest decade of the last century, while the year 1998 was the warmest year ever observed by modern techniques, with 9 out of 12 months of the year being the warmest months. Satellite ice ...
Feng, Zhixuan; Ji, Rubao; Ashjian, Carin J.; Campbell, Robert G.; Zhang, Jinlun (2017-08-24)Dramatic changes have occurred in the Arctic Ocean over the past few decades, especially in terms of sea ice loss and ocean warming. Those environmental changes may modify the planktonic ecosystem with changes from lower ...
Ummenhofer, Caroline C.; Xu, Hong; Twine, Tracy E.; Girvetz, Evan H.; McCarthy, Heather R.; Chhetri, Netra; Nicholas, Kimberly A. (American Meteorological Society, 2015-06-15)Downscaled climate model projections from phase 5 of the Coupled Model Intercomparison Project (CMIP5) were used to force a dynamic vegetation agricultural model (Agro-IBIS) and simulate yield responses to historical climate ...