News
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Critical Zone Collaborative Network
23 Nov 2020 - As of fall 2020, the Critical Zone Observatory (CZO) program has been succeeded by the Critical Zone Collaborative Network (CZ Net).
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NSF Blog: No soils, no life
27 Oct 2020 - They’re beneath our feet, but we seldom hear important signals in the soils
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AGU 2020: Sessions related to CZ Science
06 Oct 2020 - A list of sessions related to CZ Science at the upcoming virtual AGU 2020 Fall Meeting.
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October 2020 Issue of Eos features Critical Zone Science
28 Sep 2020 - In the October 2020 Issue, Eos focuses on the Critical Zone at a pivotal point as the discipline comes of age.
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K-12 Activity: Humans and Soil Change
19 Jul 2020 - The activity familiarizes students with some of the environmental and human factors that contribute to accelerated rates of soil erosion.
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2020 CZO Webinar Series on Sustainability
17 Jun 2020 - For an updated listing of these talks, including abstracts, see /national/education-outreach/sustainability-2020/ The U.S....
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Belmont Forum Announces Collaborative Research Call on Soils
20 Apr 2020 - The Belmont Forum is pleased to announce the launch of a collaborative research call on the theme: Towards Sustainability of Soils and Groundwater...
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CZOs at AGU 2019
19 Nov 2019 - A list of CZ-related sessions, abstracts and events at the 2019 AGU Fall Meeting.
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Field trip of Penn State students to the Calhoun, 6/7/2019
21 Aug 2019 - Dan Markewitz and Dan Richter led a field trip on June 6-7, 2019 in the rain (perhaps 3") across the Calhoun CZO with Penn State students. We...
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CZ colleagues: Please contact us about proposals for NSF’s CZ Collaborative Network, due 02 Dec 2019
08 Jul 2019 - CZO will end Nov 2020, succeeded by the “CZ Collaborative Network”. Let’s explore how the CZ community can build upon the CZOs via new NSF proposals.
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Graduate Student Critical Zone Reading Group Wraps the Semester with a Field Trip to Calhoun CZO
12 Jun 2019 - Five students travelled to Union, South Carolina for a two-day site visit June 6 – June 8 at the Calhoun CZO. This site visit was the...
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New paper on spatially explicit modeling of prehistoric land use footprints
07 May 2019 - Mike Coughlan and Don Nelson have a new paper in the Journal of Archaeological Science. Highlights include: Spatially explicit models of...
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Feature-Length Documentary: The Education of Bruno Latour: From the CZ to the Anthropocene
07 May 2019 - April 15, 2019 Franklin Humanities Institute “The Education of Bruno Latour: From the Critical Zone to the Anthropocene”...
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Calhoun weathering paper published in Nature’s Scientific Reports
14 Mar 2019 - Calhoun weathering paper is out in Nature's Scientific Reports.
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NSF solicitation: Dynamics of Integrated Socio-Environmental Systems (CNH2)
20 Nov 2018 - NSF Crosscutting CNH2: Dynamics of Integrated Socio-Environmental Systems (CNH2) Solicitation 19-528 DUE DATES Letter of Intent Deadline...
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CZOs at AGU 2018
19 Nov 2018 - The 2018 AGU Fall Meeting will be held December 10-14 in Washington, D.C.
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Calhoun CZO featured in Duke Magazine
14 Nov 2018 - How critical zone science unearths secrets: The new cross-disciplinary field of study concerns itself with the living skin of the Earth.
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Strengthening the biogeosciences in environmental research networks
15 Aug 2018 - Our EGU Biogeosciences Discussions manuscript became a Biogeosciences paper today! The official pdf can be downloaded (on upper right of page) at:...
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NSF Discovery articles focus on the CZOs.
10 May 2018 - The Discoveries section of the National Science Foundation's website on Critical Zone Observatories (CZOs).
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2018 Southeast Friends of the Pleistocene Field Conference
09 Feb 2018 - Geophysics, Geochemistry, and Biogeochemistry of the Southern Piedmont Critical Zone
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Latour and Folch on special attributes of critical zone science
02 Feb 2018 - Duke Assistant Professor Christine Folch (Cultural Anthropology) converses spiritedly with Prof. Bruno Latour (Philosopher of Science) on the banks...
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X-ray Diffraction for Clay Minerals at Calhoun
01 May 2017 - Anna Wade (visiting from Duke University) and Jay Austin (based at the University of Georgia) are collaborating by using X-ray Diffraction (XRD) to...
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Zach Brecheisen wins the Frederick K. Weyerhaeuser Forest History Fellowship
27 Apr 2017 - The Forest History Society announces that Zachary Brecheisen is the 2017-18 recipient of the F. K. Weyerhaeuser Fellowship! The fellowship consists...
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Diego Barcellos Featured in UGA Graduate School Magazine
08 Feb 2017 - The Winter 2017 issue of UGA Graduate features an in-depth article about cross-CZO grad student Diego Barcellos
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Bruno Latour talks about the Calhoun CZO in Munich
08 Dec 2016 - Bruno Latour, anthropologist and philosopher of science, gave a talk on Critical Zone science and the Anthropocene entitled "From the Anthropocene...
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Four soil pits installed in new Research Area 8!
21 Nov 2016 - Four soil pits were installed in new Research Area 8 at the Calhoun CZO on 21-22 November 2016 for easy access for soil sampling down to 2 meters.
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Eight new soil pits dug at the Calhoun!
17 Oct 2016 - Eight soil pits were installed at the Calhoun CZO on 17-18 October 2016 for easy access for soil sampling down to 2 meters. Photo: Will Cook.
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USFS Photos from the Historic Archive of the Calhoun Experimental Forest
03 Oct 2016 - Just posted, thanks to efforts of Don Nelson, Kathy O'Neill, Mike Coughlan, Michael Lonneman, Zachary Meyers, and many other students, is an...
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Super-high res Calhoun CZO 2016 Leaf-Off LiDAR data available!
03 Oct 2016 - The February 2016 leaf-off flight covered an area of 78.3 square kilometers, less than the summer 2014 flight, but with greater point density
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An illustrated introduction to the Calhoun Critical Zone Observatory!
22 Sep 2016 - An introduction to the Calhoun Critical Zone Observatory, by Justin Richardson and Dan Richter, illustrated by Alana McGillis has just been posted!...
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First flux tower erected at the Calhoun CZO
17 Aug 2016 - On August 17, 2016 a crew from Georgia Tech led by graduate student Yao Tang and professor Jingfeng Wang, with a little help from the folks at Duke,...
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Going deep! Gas wells installed at 8.5 m
14 Jul 2016 - Another Calhoun CZO record - gas reservoirs installed at 8.5m depth! Jay Austin, Zach Brecheisen, and Dan Richter only stopped at 8.5m because they...
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The Calhoun Experimental Forest featured in USFS publication
30 Mar 2016 - The USFS Southern Research Station's CompassLive blog features an article about the history of the Calhoun Experimental Forest, founded in 1947....
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Critical Zone Profiles - Meet the people doing CZO science (Calhoun CZO)
15 Nov 2015 - Get a sense of the people and the work. Several members of the Calhoun CZO are profiled here, including students and professors.
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New study suggests bedrock weathering based on topography
30 Oct 2015 - St. Clair et al. suggest tectonic stresses interact with topography to influence bedrock weathering.
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Sino-USA CZO scientists meet to discuss future collaborations
09 Oct 2015 - About 60 Chinese and American critical zone scientists met in Guiyang, China for two days of discussions and presentations on the significance of...
Sessions related to CZ Science at the 2021 International Clay Conference
27 Oct 2020 - The 17th International Clay Conference will be held July 12-16, 2021 in Istanbul, Turkey.
Giesen talks about “The Jim Crow South & The Lost Cause”
01 Sep 2020 - History Professor Jim Giesen, a Calhoun CZO collaborator, is teaching a class in Modern U.S. History to more than 800 students at Mississippi State...
Paul Schroeder featured on NPR’s Pulse of the Planet
05 Jun 2020 - Four 2 minute pieces featuring Paul Schroeder talking about clay were aired on NPR's Pulse of the Planet in February 2020. Please see the links...
Geology of the Calhoun CZO
05 Jun 2020 - Barrett "Bear" Jordan's MS thesis on the geology of the Calhoun is now posted! Bear's advisor Paul Schroeder says this is "a bit more...
Mac Callaham’s group presents at the Society for Freshwater Science annual meeting
31 May 2019 - Mac Callaham and his group shared their research on earthworms at the May 2019 Society for Freshwater Science annual meeting in Salt Lake City.
Events
Publications
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Impact of gully incision on hillslope hydrology. Chen, Xing, Mukesh Kumar, Daniel deB. Richter, and Yair Mau (2020): Hydrological Processes 34(19): 3848-3866
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Ansichten der Calzone: Views of the Calhoun Critical Zone Observatory. Richter, Daniel D., and Sharon A. Billings (2020): In: Critical Zones: The Science and Politics of Landing on Earth, Editors: Bruno Latour & Peter Weibel, ZKM | Center for Art and Media, distributed by The MIT Press
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Mapping depth to the argillic horizon on historically farmed soil currently under forests. Ryland, Rachel C., Aaron Thompson, Lori A.Sutter, Daniel Markewitz (2020): Geoderma 369, Article 114291
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Persistent anthropogenic legacies structure depth dependence of regenerating rooting systems and their functions. Hauser, Emma, Daniel D. Richter, Daniel Markewitz, Zachary Brecheisen, and Sharon A. Billings (2020): Biogeochemistry 147: 259-275
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Quantification of Mixed-Layer Clays in Multiple Saturation States Using NEWMOD2: Implications for the Potassium Uplift Hypothesis in the SE United States. Austin, J.C., Richter, D.D. & Schroeder, P.A. (2020): Clays and Clay Minerals
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Limited carbon contents of centuries old soils forming in legacy sediment. Wade, A., D.D. Richter, A. Cherkinsky, C.B. Craft, P.R. Heine (2020): Geomorphology 354: 107018
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Soil production and the soil geomorphology legacy of Grove Karl Gilbert. Richter, Daniel D., Martha-Cary Eppes, Jason C. Austin, Allan R. Bacon, Sharon A. Billings, Zachary Brecheisen, Terry A. Ferguson, Daniel Markewitz, Julio Pachon, Paul A. Schroeder, Anna M. Wade (2020): Soil Science Society of America Journal 84(1): 1-20
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Seasonal and spatial variation in the potential for iron reduction in soils of the Southeastern Piedmont of the US. Hodges, Caitlin, John Mallard, Daniel Markewitz, Diego Barcellos, AaronThompson (2019): CATENA 180: 32-40
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The effect of accelerated soil erosion on hillslope morphology. Bonetti, Sara, Daniel D. Richter, Amilcare Porporato (2019): Earth Surface Processes and Landforms 44(15): 3007-3019
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Ecological and genomic attributes of novel bacterial taxa that thrive in subsurface soil horizons. Brewer, Tess E., Emma L. Aronson, Keshav Arogyaswamy, Sharon A. Billings, Jon K. Botthoff, Ashley N. Campbell, Nicholas C. Dove, Dawson Fairbanks, Rachel E. Gallery, Stephen C. Hart, Jason Kaye, Gary King, Geoffrey Logan, Kathleen A. Lohse, Mia R. Maltz, Emilio Mayorga, Caitlin O’Neill, Sarah M. Owens, Aaron Packman, Jennifer Pett-Ridge, Alain F. Plante, Daniel D. Richter, Whendee L. Silver, Wendy H. Yang, Noah Fierer (2019): mBio Oct 2019, 10 (5) e01318-19 Cross-CZO National
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Development and deployment of a field-portable soil O2 and CO2 gas analyzer and sampler. Brecheisen, Zachary S., Charles W. Cook, Paul R. Heine, Junmo Ryang, Daniel deB. Richter (2019): PLoS ONE 14(8): e0220176
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Geostatistical analysis of historical contingency and land use footprints in the prehistoric settlement dynamics of the South Carolina Piedmont, North America. Coughlan, Michael R., and Donald R. Nelson (2019): Journal of Archaeological Science 107: 1-9
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How to estimate statistically detectable trends in a time series: A study of soil carbon and nutrient concentrations at the Calhoun LTSE. Mobley, M.L., Y. Yang, R.D. Yanai, K.A. Nelson, A.R. Bacon, P.R. Heine, and D.D. Richter (2019): Soil Science Society of America Journal 83(s1): S133-S140
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Natural, incidental, and engineered nanomaterials and their impacts on the Earth system. Hochella, Michael F., Jr., David W. Mogk, James Ranville, Irving C. Allen, George W. Luther, Linsey C. Marr, B. Peter McGrail, Mitsu Murayama, Nikolla P. Qafoku, Kevin M. Rosso, Nita Sahai, Paul A. Schroeder, Peter Vikesland, Paul Westerhoff, Yi Yang (2019): Science 363 (6434): eaau8299
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Distinct contributions of eroding and depositional profiles to land-atmosphere CO2 exchange in two contrasting forests. Billings, Sharon A., Daniel de B. Richter, Susan E. Ziegler, Karen Prestegaard, and Anna M. Wade (2019): Frontiers in Earth Science 7: article 36
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Links between physical and chemical weathering inferred from a 65-m-deep borehole through Earth’s critical zone. Holbrook, W. Steven, Virginia Marcon, Allan R. Bacon, Susan L. Brantley, Bradley J. Carr, Brady A. Flinchum, Daniel D. Richter, & Clifford S. Riebe (2019): Scientific Reports 9: Article number 4495
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Mercury sourcing and sequestration in weathering profiles at six Critical Zone Observatories. Richardson, Justin B., Arnulfo A. Aguirre, Heather L. Buss, A. Toby O'Geen, Xin Gu, Daniella M. Rempe, and Daniel deB. Richter (2018): Global Biogeochemical Cycles, 32(10):1542-1555 Cross-CZO National
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The formation of clay‐enriched horizons by lessivage. Calabrese, Salvatore, Daniel D. Richter, and Amilcare Porporato (2018): Geophysical Research Letters 45(15): 7588-7595
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Loss of deep roots limits biogenic agents of soil development that are only partially restored by decades of forest regeneration. Billings, S.A., D. Hirmas, P.L. Sullivan, C.A. Lehmeier, S. Bagchi, K. Min, Z. Brecheisen, E. Hauser, R. Stair, R. Flournoy, D. deB. Richter (2018): Elementa Science of the Anthropocene 6(1): 34
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Clays in the Critical Zone. Paul A. Schroeder (2018): Cambridge University Press, Cambridge, UK Cross-CZO National
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Ideas and perspectives: Strengthening the biogeosciences in environmental research networks. Richter, D.D., S.A. Billings, P.M. Groffman, E.F. Kelly, K.A. Lohse, W.H. McDowell, T.S. White, S. Anderson, D.D. Baldocchi, S. Banwart, S. Brantley, J.J. Braun, Z.S. Brecheisen, C.W. Cook, H.E. Hartnett, S.E. Hobbie, J. Gaillardet, E. Jobbagy, H.F. Jungkunst, C.E. Kazanski, J. Krishnaswamy, D. Markewitz, K. O’Neill, C.S. Riebe, P. Schroeder, C. Siebe, W.L. Silver, A. Thompson, A. Verhoef, G. Zhang (2018): Biogeosciences 15: 4815-4832 Cross-CZO National
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Influences of Native American land use on the Colonial Euro-American settlement of the South Carolina Piedmont. Coughlan, Michael R., and Donald R. Nelson (2018): PLoS ONE 13(3): e0195036
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Historical land use dynamics in the highly degraded landscape of the Calhoun Critical Zone Observatory. Coughlan, Michael R., Donald R. Nelson, Michael Lonneman, and Ashley E. Block (2017): Land 6(2), 32
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Boom and bust carbon-nitrogen dynamics during reforestation. Parolari, A.J., M.L. Mobley, A.R. Bacon, G.G. Katul, D.deB. Richter, and A. Porporato (2017): Ecological Modelling 360: 108-119
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Special issue of The Earth Scientist about the Critical Zone and the US NSF Critical Zone Observatory (CZO) program. CZO Education/Outreach team (2016): The Earth Scientist, Volume XXXII, Issue 3, Fall 2016 Cross-CZO National
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Geophysical imaging reveals topographic stress control of bedrock weathering. St. Clair, J., S. Moon, W. S. Holbrook, J. T. Perron, C. S. Riebe, S. J. Martel, B. Carr, C. Harman, K. Singha, D. deB. Richter (2015): Science 350 (6260): 534-538 Cross-CZO National
Channelization cascade in landscape evolution. Bonetti, S., M. Hooshyar, C. Camporeale, and A. Porporato (2020): PNAS 117(3): 1375-1382
Variational analysis of landscape elevation and drainage networks. Hooshyar, M., S. Anand, and A. Porporato (2020): Proceedings of the Royal Society A, 476(2239), 20190775
Wetness controls on global chemical weathering. Calabrese, S., and A. Porporato (2020): Environmental Research Communications 2(8), 085005
Rainfall intensification increases the contribution of rewetting pulses to soil heterotrophic respiration. Manzoni, S., A. Chakrawal, T. Fischer, J.P. Schimel, A. Porporato, and G. Vico (2020): Biogeosciences 17(15): 4007-4023
From turbulence to landscapes: Logarithmic mean profiles in bounded complex systems. Hooshyar, M., S. Bonetti, A. Singh, E. Foufoula-Georgiou, and A. Porporato (2020): Physical Review E 102, 033107
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