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1. The tundra phenology database: More than two decades of tundra phenology responses to climate change

   https://doi.org/10.1139/AS-2020-0041  

   Prevéy, Janet ; Elmendorf, Sarah ; Bjorkman, Anne ; Alatalo, Juha ; Ashton, Isabel ; Assmann, Jakob ; Björk, Robert G. ; Björkman, Mats P. ; Cannone, Nicoletta ; Carbognani, Michele ; et al ( May 2021 , Arctic Science)

   null (Ed.)

   Observations of changes in phenology have provided some of the strongest signals of the effects of climate change on terrestrial ecosystems. The International Tundra Experiment (ITEX), initiated in the early 1990s, established a common protocol to measure plant phenology in tundra study areas across the globe. Today, this valuable collection of phenology measurements depicts the responses of plants at the colder extremes of our planet to experimental and ambient changes in temperature over the past decades. The database contains 150,434 phenology observations of 278 plant species taken at 28 study areas for periods of 1 to 26 years. Here we describe the full dataset to increase the visibility and use of these data in global analyses, and to invite phenology data contributions from underrepresented tundra locations. Portions of this tundra phenology database have been used in three recent syntheses, some datasets are expanded, others are from entirely new study areas, and the entirety of these data are now available at the Polar Data Catalogue (https://doi.org/10.21963/13215). 

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2. Tundra photosynthesis captured by satellite-observed solar-induced chlorophyll fluorescence: TUNDRA PHOTOSYNTHESIS AND FLUORESCENCE

   https://doi.org/10.1002/2016GL070842  

   Luus, K. A. ; Commane, R. ; Parazoo, N. C. ; Benmergui, J. ; Euskirchen, E. S. ; Frankenberg, C. ; Joiner, J. ; Lindaas, J. ; Miller, C. E. ; Oechel, W. C. ; et al ( February 2017 , Geophysical Research Letters)
3. Tundra is a consistent source of CO 2 at a site with progressive permafrost thaw during 6 years of chamber and eddy covariance measurements: Tundra CO 2 Fluxes

   https://doi.org/10.1002/2016JG003671  

   Celis, Gerardo ; Mauritz, Marguerite ; Bracho, Rosvel ; Salmon, Verity G. ; Webb, Elizabeth E. ; Hutchings, Jack ; Natali, Susan M. ; Schädel, Christina ; Crummer, Kathryn G. ; Schuur, Edward A. ( June 2017 , Journal of Geophysical Research: Biogeosciences)
4. The International Tundra Experiment (ITEX): 30 years of research on tundra ecosystems

   https://doi.org/10.1139/as-2022-0041  

   Henry, Greg H.R. ; Hollister, Robert D. ; Klanderud, Kari ; Björk, Robert G. ; Bjorkman, Anne D. ; Elphinstone, Cassandra ; Jónsdóttir, Ingibjörg Svala ; Molau, Ulf ; Petraglia, Alessandro ; Oberbauer, Steven F. ; et al ( September 2022 , Arctic Science)

   The International Tundra Experiment (ITEX) was founded in 1990 as a network of scientists studying responses of tundra ecosystems to ambient and experimental climate change at Arctic and alpine sites across the globe. Common measurement and experimental design protocols have facilitated synthesis of results across sites to gain biome-wide insights of climate change impacts on tundra. This special issue presents results from more than 30 years of ITEX research. The importance of snow regimes, bryophytes, and herbivory are highlighted, with new protocols and studies proposed. The increasing frequency and magnitude of extreme climate events is shown to have strong effects on plant reproduction. The most consistent plant trait response across sites is an increase in vegetation height, especially for shrubs. This will affect surface energy balance, carbon and nutrient dynamics and trophic level interactions. Common garden studies show adaptation responses in tundra species to climate change but they are species and regionally specific. Recommendations are made including establishing sites near northern communities to increase reciprocal engagement with local knowledge holders and establishing multi-factor experiments. The success of ITEX is based on collegial cooperation among researchers and the network remains focused on documenting and understanding impacts of environmental change on tundra ecosystems. 

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5. Linkages Among Climate, Fire, and Thermoerosion in Alaskan Tundra Over the Past Three Millennia: Climate, Tundra Fire, and Thermoerosion

   https://doi.org/10.1002/2017JG004027  

   Chipman, M. L. ; Hu, F. S. ( December 2017 , Journal of Geophysical Research: Biogeosciences)