people / Williams, Mark
Williams, Mark


Mark W. Williams

PhD, University of California at Santa Barbara, 1991
Office: 303 492-8830
Fax: 303 492-6388



Research focuses on the ecology of mountain areas, looking at the interaction of organisms with their environment, focusing on classical environmental variables such as soil, rocks, and minerals as well as surrounding water sources and the local atmosphere. Current and past mountain areas studied include: the Rocky Mountains, Sierra Nevada of California, the Tien Shan and Qilian Shan, China, Andes of South America, European Alps, and the Himalayas

Disciplines: Hydrology • Biogeochemistry




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Surface and subsurface water contributions to streamflow from a mesoscale watershed in complex mountain terrain.

Zhang, Q. , Knowles, J.F., Barnes, R.T., Cowie, R.M., Rock, N., Williams, M.W., Hydrological Processes, 32, 7, 954-967, DOI: 10.1002/hyp.11469,


Topsoil and snow: a continuum system.

Freppaz, M., Pintaldi, E., Magnani, A., Viglietti, D., Williams, M.W., Applied Soil Ecology, 123, 435-440, DOI: 10.1016/j.apsoil.2017.06.029,


Dissolved black carbon in the global cryosphere: Concentrations and chemical signatures.

Khan, A.L., Wagner, S, Jaffe, R, Xian, P, Williams, M.W., Armstrong, R, McKnight, D, Wiley Online Library, AGU Geophysical Research Letters, 6226-6234, DOI: 10.1002/2017GL073485,


Sources of streamflow along a headwater catchment elevational gradient.

Cowie, R.M., Knowles, J.F, Dailey, K.R., Williams, M.W., Mills, T.J., Molotch, N.P., Journal of Hydrology, 549, 163-178, URL:


Convergent approaches to determine an ecosystem's transpiration fraction.

Berkelhammer, M., Noone, D.C., Wong, T.E., Burns, S.P., Knowles, J.F., Kaushik, A., Blanken, P.D., Williams, M.W., Global Biogeochemical Cycles, 30, 6, 933-951, DOI: 10.1002/2016GB005392,


Convergent approaches to determine an ecosystem's transpiration fraction.

Berkelhammer, M., Noone, D., Wong, T.E., Burns, S.P., Knowles, J.F., Kaushik, A., Blanken, P.D., Williams, M.W., Global Biogeochemical Cycles, 30, 933-951, DOI: 10.1002/2016GB005392,


Water soluble organic aerosols in the Colorado Rocky Mountains, USA: composition, sources and optical properties.

Xie, M, Mladenov, N, Williams, MW, Neff, JC, Nature, DOI: 10.1038/srep39339,


Climate regulates alpine lake ice cover phenology and aquatic ecosystem structure.

Preston, DL, Caine, N, McKnight, DM, Williams, MW, Hell, K, Miller, MP, Hart, SJ, Johnson, PTJ, AGU-Geophysical Research Letters, DOI: 10.1002/2016GL069036,


Wet meadow ecosystems contribute the majority of overwinter soil respiration from snow-scoured alpine tundra.

Knowles, JF, Blanken, PD, Williams, MW, Journal of Geophysical Research, 121, 1118-1130, DOI: 10.1002/2015JG003081,


An overview of research from a high elevation landscape: the Niwot Ridge, Colorado Long Term Ecological Research programme.

Williams, MW, Seastedt, TR, Bowman, WD, McKnight, DM, Suding, KN, Plant Ecology and Diversity, 8, 5-6, 597-605, DOI: 10.1080/17550874.2015.1123320,


Cryosphere: ice on Niwot Ridge and in the Green Lakes Valley, Colorado Front Range.

Leopold, M, Lewis, G, Dethier, D, Caine, N, Williams, MW, Plant Ecology & Diversity, 8, 5-6, 625-638, 1755-0874, 1755-1668, DOI: 10.1080/17550874.2014.992489,


Contrasting long-term alpine and subalpine precipitation trends in a mid-latitude North American mountain system, Colorado Front Range, USA.

Kittel, T.G.F., Williams, M.W., Chowanski, K., Hartman, M., Ackerman, T., Losleben, M., Blanken, P., Plant Ecology and Diversity, 8, 5-6, 607-624, DOI: 10.1080/17550874.2016.1143536,


Snowpack-climate manipulation using infrared heaters in subalpine forests of the Southern Rocky Mountains, USA.

Meromy, Leah, Molotch, Noah P., Williams, Mark W., Musselman, Keith N., Kueppers, Lara M., Agricultural and forest meteorology, 203, 142-157, DOI: 10.1016/j.agrformet.2014.12.015,


Winter gas exchange between the atmosphere and snow-covered soils on Niwot Ridge, Colorado, USA.

Liptzin, D., Helmig, D., Schmidt, S. K., Seok, B., Williams, M. W., Plant Ecology & Diversity, 1-12, DOI: 10.1080/17550874.2015.1065925,


The relative contributions of alpine and subalpine ecosystems to the water balance of a mountainous, headwater catchment.

Knowles, J. F., Harpold, A. A., Cowie, R., Zeliff, M., Barnard, H. R., Burns, S. P., Blanken, P. D., Morse, J. F., Williams, M. W., Hydrological Processes, 29, 22, 4794-4808, DOI: 10.1002/hyp.10526,


Soil respiration variability across a soil moisture and vegetation community gradient within a snow-scoured alpine meadow.

Knowles, J. F., Blanken, P. D., Williams, M. W., Biogeochemistry, 125, 2, 185-202, DOI: 10.1007/s10533-015-0122-3,


Mountain soils and climate change.

Freppaz, M., Williams, M. W., Understanding Moutain Soils: A contribution from mountain areas to the International Year of Soils 2015, Rome, Italy, FAO, Romeo, R., et al., 115-119,


A slide down a slippery slope - alpine ecosystem responses to nitrogen deposition.

Bowman, W.D., Nemergut, D.R., McKnight, D.M., Miller, M.P., Williams, M.W. , Plant Ecology & Diversity, DOI: 10.1080/17550874.2014.984786,


Nitrogen retention and transport differ by hillslope aspect at the rain-snow transition of the Colorado Front Range.

Hinckley, E.L.S., Barnes, R.T., Anderson, R.S., Anderson, S.P., Williams, M.W., Bernasconi, S.M., Journal of Geophysical Research Biogeosciences, 119, 7, 1281-1296, DOI: 10.1002/2013JG002588,


Use of natural and applied tracers to guide targeted remediation efforts in an acid mine drainage system, Colorado Rockies, USA.

Cowie, R., Williams, M.W., Wireman, M., Runkel, R.L., Water, 6, 4, 745-777, DOI: 10.3390/w6040745,


Spatial patterns in glacier area and elevation changes from 1962 to 2006 in the monsoon-influenced eastern Himalaya.

Racoviteanu, A., Arnaud, Y., Williams, M., Manley, W.F., The Cryosphere Discussion, 8, 3949-3998, DOI: 10.5194/tcd-8-3949-2014,


Relationships between stream nitrate concentration and spatially distributed snowmelt in high-elevation catchments of the western U.S..

Perrot, D., Molotch, N.P., Williams, M.W., Jepsen, S.M., Sickman, J.O., Water Resources Research, 50, DOI: 10.1002/2013WR015243,


Changing forest water yields in response to climate warming: results from long-term experimental watershed sites across North America.

Creed, I.F., Spargo, A.T., Jones, J.A., Buttle, J.M., Adams, M.B., Beall, F.D., Booth, E., Campbell, J., Clow, D., Elder, K., Green, M.B., Grimm, N.B., Miniat, C., Ramlal, P., Saha, A., Sebestyen, S., Spittlehouse, D., Sterling, S., Williams, M.W., Winkler, R., Yao, H., Global Change Biology, 20, 10, 3191-3208, DOI: 10.1111/gcb.12615,


Thawing glacial and permafrost features contribute to nitrogen export from Green Lakes Valley, Colorado Front Range, USA.

Barnes, R.T., Willliams, M.W., Parman, J.N., Hill, K., Caine, N., Biogeochemistry, 117, 2-3, 413-430, DOI: 10.1007/s10533-013-9886-5,


Soil properties on ski runs.

Freppaz, M., Filippa, G., Corti, G., Cocco, S., Williams, M.W., Zanini, E., The Impact of Skiing on Mountain Environments, Sharjah, Bentham Science Publishers, Rolando, A. and Rixen C., 45-64, DOI: 10.2174/97816080548861130101,


Quantifying particulate matter deposition in Niwot Ridge, Colorado: Insert collection of dry deposition and particle imaging using the FlowCAM.

Goss, N., Mladenov, N., Seibold, C., Chowanski, K., Seitz, L., Wellemeyer, T.B., Williams, M.W., Atmospheric Environment, 80, 549-558, DOI: 10.1016/j.atmosenv.2013.08.037,


Evaluation of an ice ablation model to estimate the contribution of melting glacier ice to annual discharge in the Nepalese Himalaya.

Racoviteanu, A., Armstrong, R., Williams, M.W., Water Resouces Research, 49, 5117-5133, DOI: 10.1002/wrcr.20370,


Climate and hydrology.

De Jong, C., Burer, I., Rimmer, A., Shaban, A., Williams, M.W., Mediterranean Mountain Environments, West Sussex, Wiley Blackwell, Vogiatzakis, I.,


Himalayan Glaciers: Climate Change, Water Resources, and Water Security.

Vaux, H.J. Jr., Balk, D., Cook, E.R., Gleick, P., Lau, W.K.-M., Levy, M., Malone, E.L., McDonald, P., Shindell, D., Thompson, L.G., Wescoat, J.L. Jr., Williams, M.W., Washington, DC, National Academies Press, 978-0-309-26098-5,


Initial design of data sharing infrastructure for the Critical Zone Observatory.

Zaslavsky I., Whitenack, T., Williams, M., Tarboton, D., Schreuders, K.A.T., Aufdenkampe, A., Proceedings of the Environmental Information Management Conference (EIM 2011), Oakland, University of California, Jones, M.B. and Gries, C., 145-150, DOI: 10.5060/D2NC5Z4X,


Expanding Long-Term Ecological Research to an alpine network.

Nagy, L., Williams, M., Erschbamer, E., Bonet, F., Mountain Biodiversity and Global Change, Basel, GMBA-DIVERSITAS, Spehn, E.M., Rudmann-Maurer K., Koerner, C., and Maselli, D.,


DayCent-Chem simulations of ecological and biogeochemical processes of eight mountain ecosystems in the United States.

Hartman, M.D., Baron, J.S., Clow, D.W., Creed, I.F., Driscoll, C.T., Ewing, H.A., Haines, B.D., Knoepp, J., Lajtha, K., Ojima, D.S., Parton, W.J., Renfro, J., Robinson, R.B., Van Miegroet, H., Weathers, K.C., Williams, M.W., US Geological Survey, Scientific Investigations, Report 2009-5150,


Headwater catchments of the Boulder Creek watershed.

Williams, M.W., Hood, E., Caine, N., Comprehensive Water Quality of the Boulder Creek Watershed, Colorado, During High-Flow and Low-Flow Conditions, 2000, US Geological Survey Water Resources Investigations, Murphy, S.F., Verplanck, P.L., Barber, L.B., Report 03-4045, 185-197,

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This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1637686. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necesarily reflect the views of the National Science Foundation.

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