Fluxes of energy, water, and carbon dioxide from mountain ecosystems at Niwot Ridge, Colorado

References

• Aubinet MA, Grelle A, Ibrom A, Rannik Ü, Moncrieff JB, Foken T, Kowalski AS, Martin PH, Berbigier P, Bernhofer Ch, et al. 2000. Estimates of the annual net carbon and water exchange of forests: the EUROFLUX methodology. Advances in Ecological Research 30:1–64.
   Google Scholar
• Baldocchi DD, Falge E, Gu L, Olson R, Hollinger D, Running S, Anthoni P, Bernhofer C, Davis K, Evans R, et al. 2001. FLUXNET: a new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities. Bulletin of the American Meteorological Society 82:2415–2434.
   Web of Science ®Google Scholar
• Baldocchi DD, Finnigan J, Wilson K, Paw U KT, Falge E. 2000. On measuring net ecosystem carbon exchange over tall vegetation on complex terrain. Boundary-Layer Meteorology 96:257–291.
   Web of Science ®Google Scholar
• Bales RC, Molotch NP, Painter TH, Dettinger MD, Rice R, Dozier J. 2006. Mountain hydrology of the western United States. Water Resources Research 42:doi:10.1029/2005WR004387
   Web of Science ®Google Scholar
• Barnett TP, Adam JC, Lettenmaier DP. 2005. Potential impacts of a warming climate on water availability in snow-dominated regions. Nature 438:303–309.
   PubMed Web of Science ®Google Scholar
• Barnett T, Malone R, Pennell W, Stammer D, Semtner B, Washington W. 2004. The effects of climate change on water resources in the west: introduction and overview. Climatic Change 62:1–11.
   Web of Science ®Google Scholar
• Baron JS, Schmidt TM, Hartman MD. 2009. Climate-induced changes in high elevation stream nitrate dynamics. Global Change Biology 15:1777–1789.
   Web of Science ®Google Scholar
• Beniston M. 2003. Climatic change in mountain regions: a review of possible impacts. Climatic Change 59:5–31.
   Web of Science ®Google Scholar
• Black TA, Chen WJ, Barr AG, Arain MA, Chen Z, Nesic Z, Hogg EH, Neumann HH, Yang PC. 2000. Increased carbon sequestration by a boreal deciduous forest in years with a warm spring. Geophysical Research Letters 27:1271–1274.
   Web of Science ®Google Scholar
• Blanken PD, Williams MW, Burns SP, Monson RK, Knowles J, Chowanski K, Ackerman T. 2009. A comparison of water and carbon dioxide exchange at a windy alpine tundra and subalpine forest site near Niwot Ridge, Colorado. Biogeochemistry 95:61–76.
   Web of Science ®Google Scholar
• Bowling DR, Burns SP, Conway TJ, Monson RK, White JWC. 2005. Extensive observations of CO2 carbon isotope content in and above a high-elevation subalpine forest. Global Biogeochemical Cycles 19:doi:10.1029/2004GB002394.
   Web of Science ®Google Scholar
• Bowman WD, Steltzer H, Rosenstiel TN, Cleveland CC, Meier CL. 2004. Litter effects of two co-occurring alpine species on plant growth, microbial activity and immobilization of nitrogen. Oikos 104:336–344.
   Web of Science ®Google Scholar
• Bradford JB, Weishampel P, Smith M-L, Kolka R, Birdsey RA, Ollinger S, Ryan MG. 2010. Carbon pools and fluxes in small temperate forest landscapes: variability and implications for sampling design. Forest Ecology and Management 259:1245–1254.
   Web of Science ®Google Scholar
• Brooks PD, Grogan P, Templer PH, Groffman P, Öquist MG, Schimel J. 2011. Carbon and nitrogen cycling in snow-covered environments. Geography Compass 5:682–699.
   Google Scholar
• Brooks PD, McKnight D, Elder K. 2005. Carbon limitation of soil respiration under winter snowpacks: potential feedbacks between growing season and winter carbon fluxes. Global Change Biology 11:231–238.
   Web of Science ®Google Scholar
• Brooks PD, Schmidt SK, Williams MW. 1997. Winter production of CO2 and N2O from alpine tundra: environmental controls and relationship to inter-system C and N fluxes. Oecologia 110:403–413.
   PubMed Web of Science ®Google Scholar
• Burba GG, McDermitt DK, Grelle S, Anderson DJ, Xu L. 2008. Addressing the influence of instrument surface heat exchange on the measurements of CO2 flux from open-path gas analyzers. Global Change Biology 14:1854–1876.
   Web of Science ®Google Scholar
• Burns SP, Horst TW, Jacobsen L, Blanken PD, Monson RK. 2012. Using sonic anemometer temperature to measure sensible heat flux in strong winds. Atmospheric Measurement Techniques 5:2095–2111.
   Web of Science ®Google Scholar
• Burns SP, Molotch NP, Williams MW, Knowles JF, Seok B, Monson RK, Turnipseed AA, Blanken PD. 2014. Snow temperature changes within a seasonal snowpack and their relationship to turbulent fluxes of sensible and latent heat. Journal of Hydrometeorology 15:117–142.
   Web of Science ®Google Scholar
• Burns SP, Sun J, Lenschow DH, Oncley SP, Stephens BB, Yi C, Anderson DE, Hu J, Monson RK. 2010. Atmospheric stability effects on wind fields and scalar mixing within and just above a subalpine forest in sloping terrain. Boundary-Layer Meteorology 138:231–262.
   Web of Science ®Google Scholar
• Caine N. 2010. Recent hydrologic change in a Colorado alpine basin: an indicator of permafrost thaw? Annals of Glaciology 51:130–134.
   Web of Science ®Google Scholar
• Chapin FS III, Woodwell GM, Randerson JT, Rastetter EB, Lovett GM, Baldocchi DD, Clark DA, Harmon ME, Schimel DS, Valentini R, et al. 2006. Reconciling carbon-cycle concepts, terminology, and methods. Ecosystems 9:1041–1050.
   Web of Science ®Google Scholar
• Churkina G, Schimel D, Braswell BH, Xiao X. 2005. Spatial analysis of growing season length control over net ecosystem exchange. Global Change Biology 11:1777–1787.
   Web of Science ®Google Scholar
• Clow DW. 2010. Changes in the timing of snowmelt and streamflow in Colorado: a response to recent warming. Journal of Climate 23:2293–2306.
   Web of Science ®Google Scholar
• Desai AR, Moore DJP, Ahue WKM, Wilkes PTV, de Wekker SFJ, Brooks BG, Campos TL, Stephens BB, Monson RK, Burns SP, Quaife T, et al. 2011. Seasonal pattern of regional carbon balance in the central Rocky Mountains from surface and airborne measurements. Journal of Geophysical Research 116:doi:10.1029/2011JG001655.
   PubMed Web of Science ®Google Scholar
• Desjardins RL. 1985. Carbon dioxide budget of maize. Agricultural and Forest Meteorology 36:29–41.
   Web of Science ®Google Scholar
• Erickson TA, Williams MW, Winstral A. 2005. Persistence of topographic controls on the spatial distribution of snow in rugged mountain terrain, Colorado, United States. Water Resources Research 41:doi:10.1029/2003WR002973.
   PubMed Web of Science ®Google Scholar
• Falge E, Baldocchi D, Tenhunen J, Aubinet M, Bakwin P, Berbigier P, Bernhofer C, Burba G, Clement R, Davis KJ, et al. 2002. Seasonality of ecosystem respiration and gross primary productivity as derived from FLUXNET measurements. Agricultural and Forest Meteorology 113:53–74.
   Web of Science ®Google Scholar
• Finnigan JJ. 2004. A re-evaluation of long-term flux measurement techniques part II: coordinate systems. Boundary-Layer Meteorology 113:1–41.
   Web of Science ®Google Scholar
• Finnigan JJ. 2008. An introduction to flux measurements in difficult conditions. Ecological Applications 18:1340–1350.
   PubMed Web of Science ®Google Scholar
• Fisk MC, Schmidt SK, Seastedt TR. 1998. Topographic patterns of above- and belowground production and nitrogen cycling in alpine tundra. Ecology 79:2253–2266.
   Web of Science ®Google Scholar
• Foken T, Aubinet M, Leuning R. 2012. The Eddy Covariance Method. In: Aubinet M, Vesala T, Papale D, editors. Eddy covariance: a practical guide to measurement and data analysis. New York (NY): Springer Atmospheric Sciences. p. 1–20.
   Google Scholar
• Foken T, Wichura B. 1996. Tools for quality assessment of surface-based flux measurements. Agricultural and Forest Meteorology 78:83–105.
   Web of Science ®Google Scholar
• Gea-Izquierdo G, Mäkelä A, Margolis H, Bergeron Y, Black TA, Dunn A, Hadley J, Paw U KT, Falk M, Wharton S, et al. 2010. Modeling acclimation of photosynthesis to temperature in evergreen conifer forests. New Phytologist 188:175–186.
   PubMed Web of Science ®Google Scholar
• Goulden ML, Munger JW, Fan S-M, Daube BC, Wofsy SC. 1996. Exchange of carbon dioxide by a deciduous forest: response to interannual climate variability. Science 271:1–3.
   Web of Science ®Google Scholar
• Greenland D. 1989. The climate of Niwot Ridge, Front Range, Colorado, U.S.A. Arctic and Alpine Research 21:380–391.
   Google Scholar
• Gustafson JR, Brooks PD, Molotch NP, Veatch WC. 2010. Estimating snow sublimation using natural chemical and isotopic tracers across a gradient of solar radiation. Water Resources Research 46:doi:10.1029/2009WR009060.
   PubMed Web of Science ®Google Scholar
• Hammerle A, Haslwanter A, Schmitt M, Bahn M, Tappeiner U, Cernusca A, Wohlfahrt G. 2007. Eddy covariance measurements of carbon dioxide, latent and sensible energy fluxes above a meadow on a mountain slope. Boundary-Layer Meteorology 122:397–416.
   PubMed Web of Science ®Google Scholar
• Hollinger DY, Richardson AD. 2005. Uncertainty in eddy covariance measurements and its application to physiological models. Tree Physiology 25:873–885.
   PubMed Web of Science ®Google Scholar
• Hood E, Williams MW, Cline D. 1999. Sublimation from a seasonal snowpack at a continental, mid-latitude alpine site. Hydrological Processes 13:1781–1797.
   Web of Science ®Google Scholar
• Hu J, Moore DJP, Burns SP, Monson RK. 2010a. Longer growing seasons lead to less carbon sequestration by a subalpine forest. Global Change Biology 16:771–783.
   Web of Science ®Google Scholar
• Hu J, Moore DJP, Riveros-Iregui D, Burns SP, Monson RK. 2010b. Modeling whole-tree carbon assimilation rate using observed transpiration rates and needle sugar carbon isotope ratios. New Phytologist 185:1000–1015.
   PubMed Web of Science ®Google Scholar
• Huxman TE, Turnipseed AA, Sparks JP, Harley PC, Monson RK. 2003. Temperature as a control over ecosystem CO2 fluxes in a high-elevation, subalpine forest. Oecologia 134:537–546.
   PubMed Web of Science ®Google Scholar
• Janke JR. 2005. The occurrence of alpine permafrost in the Front Range of Colorado. Geomorphology 67:375–389.
   Web of Science ®Google Scholar
• Jung M, Reichstein M, Margolis HA, Cescatti A, Richardson AD, Altaf Afrain M, Arneth A, Bernhofer C, Bonal D, Chen J, et al. 2011. Global patterns of land-atmosphere fluxes of carbon dioxide, latent heat, and sensible heat derived from eddy covariance, satellite, and meteorological observations. Journal of Geophysical Research 116: doi:10.1029/2010JG001566.
   PubMed Web of Science ®Google Scholar
• Keeling CD, Chin J, Whorf TP. 1996. Increased activity of northern vegetation inferred from atmospheric CO2 measurements. Nature 382:146–149.
   Web of Science ®Google Scholar
• Knowles JF, Blanken PD, Williams MW, Chowanski KM. 2012. Energy and surface moisture seasonally limit evaporation and sublimation from snow-free alpine tundra. Agricultural and Forest Meteorology 157:106–115.
   Web of Science ®Google Scholar
• Kurc SA, Small EE. 2004. Dynamics of evapotranspiration in semiarid grassland and shrubland ecosystems during the summer monsoon season, central New Mexico. Water Resources Research 40:doi:10.1029/2004WR003068.
   Web of Science ®Google Scholar
• Le Quéré C, Raupach MR, Canadell JG, Marland G, Bopp L, Ciais P, Conway TJ, Doney SC, Feely RA, Foster P, et al. 2009. Trends in the sources and sinks of carbon dioxide. Nature Geoscience 2:831–836.
   Web of Science ®Google Scholar
• Leuning R, Van Gorsel E, Massman WJ, Isaac PR. 2012. Reflections on the surface energy imbalance problem. Agricultural and Forest Meteorology 156:65–74.
   Web of Science ®Google Scholar
• Liptzin D, Williams MW, Helmig D, Seok B, Filippa G, Chowanski KM, Hueber J. 2009. Process-level controls on CO2 fluxes from a seasonally snow-covered subalpine meadow soil, Niwot Ridge, Colorado. Biogeochemistry 95:151–166.
   Web of Science ®Google Scholar
• Litton CM, Raich JW, Ryan MG. 2007. Carbon allocation in forest ecosystems. Global Change Biology 13:2089-2109.
   Web of Science ®Google Scholar
• Lloyd J, Taylor JA. 1994. On the temperature dependence of soil respiration. Functional Ecology 8:315–323.
   Web of Science ®Google Scholar
• Mack MC, Schuur EAG, Bret-Harte MS, Shaver GR, Chapin FS III. 2004. Ecosystem carbon storage in arctic tundra reduced by long-term nutrient fertilization. Nature 431:440–443.
   PubMed Web of Science ®Google Scholar
• Mast MA, Wickland KP, Striegl RT, Clow DW. 1998. Winter fluxes of CO2 and CH4 from subalpine soils in Rocky Mountain National Park, Colorado. Global Biogeochemical Cycles 12:607–620.
   Web of Science ®Google Scholar
• Mäkelä A, Pulkkinen M, Kolari P, Lagergren F, Berbigier P, Lindroth A, Loustau D, Nikinmaa E, Vesala T, Hari P. 2008. Developing an empirical model of stand GPP with the LUE approach: analysis of eddy covariance data at five contrasting conifer sites in Europe. Global Change Biology 14:92–108.
   Web of Science ®Google Scholar
• Molotch NP, Blanken PD, Williams MW, Turnipseed AA, Monson RK, Margulis SA. 2007. Estimating sublimation of intercepted and sub-canopy snow using eddy covariance systems. Hydrological Processes 21:1567–1575.
   Web of Science ®Google Scholar
• Molotch NP, Brooks PD, Burns SP, Litvak M, Monson RK, McConnell JR, Musselman K. 2009. Ecohydrological controls on snowmelt partitioning in mixed-conifer sub-alpine forests. Ecohydrology 2:129–142.
   Web of Science ®Google Scholar
• Monson RK, Burns SP, Williams MW, Delany AC, Weintraub M, Lipson DA. 2006b. The contribution of beneath-snow soil respiration to total ecosystem respiration in a high-elevation, subalpine forest. Global Biogeochemical Cycles 20:doi:10.1029/2005GB002684.
   Web of Science ®Google Scholar
• Monson RK, Lipson DL, Burns SP, Turnipseed AA, Delany AC, Williams MW, Schmidt SK. 2006a. Winter forest soil respiration controlled by climate and microbial community composition. Nature 439:711–714.
   PubMed Web of Science ®Google Scholar
• Monson RK, Prater MR, Hu J, Burns SP, Sparks JP, Sparks KL, Scott-Denton LE. 2010. Tree species effects on ecosystem water-use efficiency in a high-elevation, subalpine forest. Oecologia 162:491–504.
   PubMed Web of Science ®Google Scholar
• Monson RK, Sparks JP, Rosenstiel TN, Scott-Denton LE, Huxman TE, Harley PC, Turnipseed AA, Burns SP, Backlund B, Hu J. 2005. Climatic influences on net ecosystem CO2 exchange during the transition from wintertime carbon source to springtime carbon sink in a high-elevation, subalpine forest. Oecologia 146:130–147.
   PubMed Web of Science ®Google Scholar
• Monson RK, Turnipseed AA, Sparks JP, Harley PC, Scott-Denton LE, Sparks K, Huxman TE. 2002. Carbon sequestration in a high-elevation subalpine forest. Global Change Biology 8:459–478.
   Web of Science ®Google Scholar
• Moore DJP, Hu J, Sacks WJ, Schimel DS, Monson RK. 2008. Estimating transpiration and the sensitivity of carbon uptake to water availability in a subalpine forest using a simple ecosystem process model informed by measured net CO2 and H2O fluxes. Agricultural and Forest Meteorology 148:1467–1477.
   Web of Science ®Google Scholar
• Moore DJP, Trahan NA, Wilkes P, Quaife T, Stephens BB, Elder K, Desai AR, Negron J, Monson RK. 2013. Persistent reduced ecosystem respiration after insect disturbance in high elevation forests. Ecology Letters 16:731–737.
   PubMed Web of Science ®Google Scholar
• Mote PW, Hamlet AF, Clark MP, Lettenmaier DP. 2005. Declining mountain snowpack in Western North America. Bulletin of the American Meteorological Society 86:39–49.
   Web of Science ®Google Scholar
• Neff JC, Townsend AR, Gleixner G, Lehman SJ, Turnbull J, Bowman WD. 2002. Variable effects of nitrogen additions on the stability and turnover of soil carbon. Nature 419:915–917.
   PubMed Web of Science ®Google Scholar
• Oechel WC, Vourlitis GL, Hastings SJ, Zulueta RC, Hinzman L, Kane D. 2000. Acclimation of ecosystem CO2 exchange in the Alaskan arctic in response to decadal climate warming. Nature 406:978–981.
   PubMed Web of Science ®Google Scholar
• Pugh E, Gordon E. 2012. A conceptual model of water yield effects from beetle-induced tree death in snow-dominated lodgepole pine forests. Hydrological Processes doi:10.1002/hyp.9312.
   Google Scholar
• Raich JW, Schlesinger WH. 1992. The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate. Tellus B 44:81–99.
   Google Scholar
• Reverter BR, Sánchez-Cañete EP, Resco V, Serrano-Ortiz P, Oyonarte C, Kowalski AS. 2010. Analyzing the major drivers of NEE in a Mediterranean alpine shrubland. Biogeosciences 7:2601–2611.
   Web of Science ®Google Scholar
• Richardson AD, Hollinger DY, Burba GG, Davis KJ, Flanagan LB, Katul GG, Munger JW, Ricciuto DM, Stoy PC, Suyker AE, et al. 2006. A multi-site analysis of random error in tower-based measurements of carbon and energy fluxes. Agricultural and Forest Meteorology 136:1–18.
   Web of Science ®Google Scholar
• Riveros-Iregui DA, Hu J, Burns SP, Bowling DR, Monson RK. 2011. An interannual assessment of the relationship between the stable carbon isotopic composition of ecosystem respiration and climate in a high-elevation subalpine forest. Journal of Geophysical Research 116:doi:10.1029/2010JG001556.
   PubMed Web of Science ®Google Scholar
• Rodriguez-Iturbe I. 2000. Ecohydrology: a hydrologic perspective of climate-soil-vegetation dynamics. Water Resources Research 36:3–9.
   Web of Science ®Google Scholar
• Sacks WJ, Schimel DS, Monson RK. 2007. Coupling between carbon cycling and climate in a high-elevation, subalpine forest: a model-data fusion analysis. Oecologia 151:54–68.
   PubMed Web of Science ®Google Scholar
• Sacks WJ, Schimel DS, Monson RK, Braswell BH. 2006. Model-data synthesis of diurnal and seasonal CO2 fluxes at Niwot Ridge, Colorado. Global Change Biology 12:240–259.
   Web of Science ®Google Scholar
• Schadt CW, Martin AP, Lipson DA, Schmidt SK. 2003. Seasonal dynamics of previously unknown fungal lineages in tundra soils. Science 301:1359–1361.
   PubMed Web of Science ®Google Scholar
• Schimel DS, Kittel TGF, Running S, Monson R, Turnipseed A, Anderson D. 2002. Carbon sequestration studied in western U.S. mountains. Eos, Transactions American Geophysical Union 83:445–449.
   Google Scholar
• Schimel DS, Melillo JM, Tian H, McGuire AD, Kicklighter D, Kittel T, Rosenbloom N, Running S, Thornton P, Ojima D, et al. 2000. Contribution of increasing CO2 and climate to carbon storage by ecosystems in the United States. Science 287:2004–2006.
   PubMed Web of Science ®Google Scholar
• Scott-Denton LE, Moore DJP, Rosenbloom NA, Kittel TGF, Burns SP, Schimel DS, Monson RK. 2013. Forecasting net ecosystem CO2 exchange in a subalpine forest using model data assimilation combined with simulated climate and weather generation. Journal of Geophysical Research: Biosciences 118:549–565.
   Web of Science ®Google Scholar
• Scott-Denton LE, Rosenstiel TN, Monson RK. 2006. Differential controls by climate and substrate over the heterotrophic and rhizospheric components of soil respiration. Global Change Biology 12:205–216.
   Web of Science ®Google Scholar
• Scott-Denton LE, Sparks KL, Monson RK. 2003. Spatial and temporal controls of soil respiration rate in a high-elevation, subalpine forest. Soil Biology and Biochemistry 35:525–534.
   Web of Science ®Google Scholar
• Sommerfeld RA, Mosier AR, Musselman RC. 1993. CO2, CH4 and N2O flux through a Wyoming snowpack and implications for global budgets. Nature 361:140–142.
   Web of Science ®Google Scholar
• Stoy PC, Mauder M, Foken T, Marcolla B, Boegh E, Ibrom A, Arain MA, Arneth A, Aurela M, Bernhofer Ch, et al. 2013. A data-driven analysis of energy balance closure across FLUXNET research sites: the role of landscape scale heterogeneity. Agricultural and Forest Meteorology 171–172:137–152.
   Web of Science ®Google Scholar
• Sun J, Burns SP, Delany AC, Oncley SP, Turnipseed AA, Stephens BB, Lenschow DH, LeMone MA, Monson RK, Anderson DE. 2007. CO2 transport over complex terrain. Agricultural and Forest Meteorology 145:1–21.
   Web of Science ®Google Scholar
• Sun J, Oncley SP, Burns SP, Stephens BB, Lenschow DH, Campos T, Monson RK, Schimel DS, Sacks WJ, de Wekker SFJ, et al. 2010. A multiscale and multidisciplinary investigation of ecosystem–atmosphere CO2 exchange over the Rocky Mountains of Colorado. Bulletin of the American Meteorological Society 91:209–230.
   Web of Science ®Google Scholar
• Turnipseed AA, Anderson DE, Blanken PD, Baugh WM, Monson RK. 2003. Airflows and turbulent flux measurements in mountainous terrain part 1. Canopy and local effects. Agricultural and Forest Meteorology 119:1–21.
   Web of Science ®Google Scholar
• Turnipseed AA, Anderson DE, Burns SP, Blanken PD, Monson RK. 2004. Airflows and turbulent flux measurements in mountainous terrain part 2: mesoscale effects. Agricultural and Forest Meteorology 125:187–205.
   Web of Science ®Google Scholar
• Turnipseed AA, Blanken PD, Anderson DE, Monson RK. 2002. Energy budget above a high-elevation subalpine forest in complex topography. Agricultural and Forest Meteorology 110:177–201.
   Web of Science ®Google Scholar
• Valentini R, Matteucci G, Dolman AJ, Schulze ED, Rebmann C, Moors EJ, Granier A, Gross P, Jensen NO, Pilegaard K, et al. 2000. Respiration as the main determinant of carbon balance in European forests. Nature 404:861–865.
   PubMed Web of Science ®Google Scholar
• Verma SB, Kim J, Clement RJ. 1989. Carbon dioxide, water vapor and sensible heat fluxes over a tallgrass prairie. Boundary-Layer Meteorology 46:53–67.
   Web of Science ®Google Scholar
• Walker MD, Walker DA, Theodose TA, Webber, PJ. 2001. The vegetation: hierarchical species-environment relationships. In: Bowman WD, Seastedt TR, editors. Structure and function of an alpine ecosystem: Niwot Ridge, Colorado. New York (NY): Oxford University Press. p. 99–127.
   Google Scholar
• Wang X, Piao S, Ciais P, Li J, Friedlingstein P, Koven C, Chen A. 2011. Spring temperature change and its implication in the change of vegetation growth in North America from 1982 to 2006. Proceedings of the National Academy of Sciences 108:1240–1245.
   PubMed Web of Science ®Google Scholar
• Weintraub MN, Scott-Denton LE, Schmidt SK, Monson RK. 2007. The effects of tree rhizodeposition on soil exoenzyme activity, dissolved organic carbon, and nutrient availability in a subalpine forest ecosystem. Oecologia:327–338.
   Google Scholar
• Welker JM, Brown KB, Fahnestock JT. 1999. CO2 flux in arctic and alpine dry tundra: comparitive field responses under ambient and experimentally warmed conditions. Arctic, Antarctic, and Alpine Research 31:272–277.
   Web of Science ®Google Scholar
• Wilczak JM, Oncley SP, Stage SA. 2001. Sonic anemometer tilt correction algorithms. Boundary-Layer Meteorology 99:127–150.
   Web of Science ®Google Scholar
• Williams MW, Barnes RT, Parman JN, Freppaz M, Hood E. 2011. Stream water chemistry along an elevational gradient from the Continental Divide to the foothills of the Rocky Mountains. Vadose Zone Journal 10:900–914.
   Web of Science ®Google Scholar
• Williams MW, Losleben MV, Hamann HB. 2002. Alpine areas in the Colorado Front Range as monitors of climate change and ecosystem response. Geographical Review 92:180–191.
   Web of Science ®Google Scholar
• Xiao J, Zhuang Q, Law BE, Chen J, Baldocchi DD, Cook DR, Oren R, Richardson AD, Wharton S, Ma S, et al. 2010. A continuous measure of gross primary production for the conterminous United States derived from MODIS and AmeriFlux data. Remote Sensing of Environment 114:576–591.
   Web of Science ®Google Scholar
• Yi C, Anderson DE, Turnipseed AA, Burns SP, Sparks JP, Stannard DI, Monson RK. 2008. The contribution of advective fluxes to net ecosystem exchange in a high-elevation, subalpine forest. Ecological Applications 18:1379–1390.
   PubMed Web of Science ®Google Scholar
• Yi C, Monson RK, Zhai Z, Anderson DE, Lamb B, Allwine G, Turnipseed AA, Burns SP. 2005. Modeling and measuring the nocturnal drainage flow in a high-elevation, subalpine forest with complex terrain. Journal of Geophysical Research 110:doi:10.1029/2005JD006282.
   Web of Science ®Google Scholar
• Zhao L, Li J, Xu S, Zhou H, Li Y, Gu S, Zhao X. 2010. Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau. Biogeosciences 7:1207–1221.
   Web of Science ®Google Scholar
• Zimov SA, Schuur EAG, Chapin FS III. 2006. Permafrost and the global carbon budget. Science 312:1612–1613.
   PubMed Web of Science ®Google Scholar
• Zobitz JM, Burns SP, Reichstein M, Bowling DR. 2008. Partitioning net ecosystem carbon exchange and the carbon isotopic disequilibrium in a subalpine forest. Global Change Biology 14:1785–1800.
   Web of Science ®Google Scholar