Senior Research Associate; Earth and Mineral Sciences, Penn State University
Penn State - The Pennsylvania State University
PhD, Geology, Pennsylvania State University, 1999
White is the Coordinator of the CZO National Office, which promotes communication among CZO PIs, organizes national meetings, offers graduate/young scientist workshops, and develops electronic delivery of educational resources for Critical Zone science. White's research is predominantly field-based, using the disciplines of sedimentary geology, paleoclimatology, paleopedology, chemostratigraphy, organic petrology, and hydrogeology.
Toward Better Understanding of Terrestrial Processes through Long-Term Hydrological Observatories (Introduction to Special Section: Hydrological Observatories). BOGENA, H.R., T. WHITE, O. BOUR, K.H. JENSEN (2019): Vadose Zone Journal, 17, 1
Interdisciplinary Teaching about Earth and the Environment for a Sustainable Future Book Chapter: Implementing and Assessing InTeGrate Critical Zone Science Materials in an Undergraduate Geoscience Program. Ashlee Dere, Carol Engelmann, Timothy White, Adam Wymore, Adam Hoffman, James Washburne, Martha Conklin (2018): Springer Cross-CZO National
Steering Operational Synergies in Terrestrial Observation Networks: Opportunity for Advancing Earth System Dynamics Modelling. Baatz, R., Sullivan, P.L., Li, L., Weintraub, S.R., Loescher, H.W., Mirtl, M., Groffman, P.M., Wall, D.H., Young, M., White, T., Wen, H., Zacharias, S., Kuhn, I., Tang, J., Gaillardet, J., Braud, I., Flores, A.N., Kumar, P., Lin, H., Ghezzehei, T., Jones, J., Gholz, H.L., Vereecken, H., and Van Looy, K. (2018): Earth System Dynamics
Susquehanna Shale Hills Critical Zone Observatory: Shale Hills in the Context of Shaver's Creek Watershed. Brantley Susan, White Timothy, West Nicole, Williams Jennifer, Forsythe Brandon, Shapich Dan, Kaye Jason, Lin Hangsheng (Henry), Shi Yuning, Kaye Margot, Herndon Elizabeth, Davis Kenneth, He Yuting, Eissenstat David, Weitzman Julie, DiBiase Roman, Li Li, Reed Warren, Brubaker Kristen, Gu Xin (2018): Vadose Zone Journal, 17:180092
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
REE mobility and fractionation during shale weathering along a climate gradient. Jin, L., Ma, L., Dere, A., White, T., Mathur, M., and Brantely, S. (2017): Chemical Geology 466, 352-379
Designing a network of critical zone observatories to explore the living skin of the terrestrial Earth. Brantley, S.L., McDowell, W.H., Dietrich, W.E., White, T.S., Kumar, P., Anderson, S., Chorover, J., Lohse, K.A., Bales, R.C., Richter, D., Grant, G., and Gaillardet, J. (2017): Earth Surface Dynamics, 5, 841–860 Cross-CZO National
Integrated Interdisciplinary Science of the Critical Zone as a Foundational Curriculum for Addressing Issues of Environmental Sustainability. Timothy White, Adam Wymore, Ashlee Dere, Adam Hoffman, James Washburne, and Martha Conklin (2017): Journal of Geoscience Education Vol. 65, No. 2, pp. 136-145 National
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
Mineralogical Transformations and Soil Development in Shale across a Latitudinal Climosequence. Dere Ashlee L., Timothy S. White, Richard April, and Susan L. Brantley (2016): Soil Science Society of America, 80:623–636
International Cooperation in Critical Zone (CZ) Science and Education. Menon, M., and White, T. (2016): The Earth Scientist XXXII, no. 3 (Fall 2016): 11–14 National
Oxidative Dissolution under the Channel Leads Geomorphological Evolution at the Shale Hills Catchment . Sullivan, P.L., Hynek, S., Gu, X., Singha, K., White, T.S., West, N., Kim, H., Kirby, E., Clarke, B.; Duffy, C.; Brantley, S.L. (2016): American Journal of Science, 316 (10): 981-1026
Critical Zone Science and Observatories and Related Education and Outreach Activities and Resources. White, T, and Duggan-Haas, D. (2016): The Earth Scientist XXXII, no. 3 (Fall 2016): 7–10 National
Earth Surface Processes in the Critical Zone: An Introductory Course Designed for Teachers. White, T. (2016): The Earth Scientist XXXII, no. 3 (Fall 2016): 22–24 Cross-CZO National
Critical Zone Oxford Bibliography . White, T., Sharkey, S. (2016): Oxford Bibliographies National
Using soil records with atmospheric dispersion modeling to investigate the effects of clean air regulations on 60 years of manganese deposition in Marietta, Ohio (USA). Carter, M., B.J. Gaudet, D.R. Stauffer, T.S. White, and S.L. Brantley (2015): Science of the Total Environment, Vol 515-516:49-59
Chapter 2 – The Role of Critical Zone Observatories in Critical Zone Science. White T., Brantley S., Banwart S., Chorover J., Dietrich W., Derry L., Lohse K., Anderson S., Aufdendkampe A., Bales R., Kumar P., Richter D., McDowell B. (2015): Developments in Earth Surface Processes 19: 15–78 Cross-CZO National
Modelling long-term water yield effects of forest management in a Norway spruce forest. Yu, Xuan, Anna Lamačová, Christopher Duffy, Pavel Krám, Jakub Hruška, Tim White & Gopal Bhatt (2015): Hydrological Sciences Journal, 60:2, 174-191
Climate dependence of feldspar weathering along a latitudinal gradient. Dere, A. L., White T. S., April R. H., Reynolds B., Miller T. E., Knapp E. P., McKay L. D. and Brantley S. L (2013): Geochim. Cosmochim. Acta 122:101-126
Mineral weathering and elemental transport during hillslope evolution at the Susquehanna/Shale Hills Critical Zone Observatory . Jin, L., Ravella, R., Ketchum, B., Bierman, P.R., Heaney, P., White, T.S. and Brantley, S.L. (2010): Geochimica et Cosmochimica Acta 74 (13):3669-3691.
Papers and books that explicitly acknowledge a CZO grant are highlighted in PALE ORANGE.
CZO National Office Annual Report 2019. Derry, L. (2019): NSF Award #1360760 National
CZO National Office Annual Report 2018. Derry, L. (2018): CZO National Office, Cornell University National
Sediment flux rates by tree throw in the Shale Hills Critical Zone Observatory and associated satellite sites in the Appalachian Mountains. Timothy S. White*, Ashlee Laura Denton Dere, Sarah Sharkey (2018): Abstract EP11D-2079 presented at 2018 AGU Fall Meeting, Washington, D.C., 10-14
CZO National Office Annual Report 2017. Derry, L. (2017): CZO National Office, Cornell University National
Fostering Collaboration Across the US Critical Zone Observatories Network. Sharkey, S. and White, T. (2017): 2017 American Geophysical Union Fall Meeting, New Orleans, LA, 11-15 Dec Cross-CZO National
Teaching climate science within the transdisciplinary framework of Critical Zone science . White, T.; Wymore, A.; Dere, A. L. D.; Washburne, J. C.; Hoffman, A.; Conklin, M. (2017): Fall Meeting, American Geophysical Union, December 2017. Abstract ED24A-02.
Teaching climate science within the transdisciplinary framework of Critical Zone science (Invited). White, T.S., Wymore, A., Dere, A.L.D., Washburne, J.C., Hoffman, A., Conklin, M. (2017): 2017 American Geophysical Union Fall Meeting, New Orleans, LA, 11-15 Dec Cross-CZO
CZO National Office Annual Report 2016. Derry, L. (2016): CZO National Office, Cornell University National
The Shale Hills Critical Zone Observatory Virtual Fieldwork Experience: Using Virtual Fieldwork to Catalyze Actual Field Work in K-16 Classes (Invited). Duggan-Haas, D., Smith, L., White, T., Ross, R.M., and Derry, L.A. (2016): 2016 Geological Society of America Fall Meeting, Denver, CO, 25-28 September
Critical Zone Observatories: Platforms for Collaborative Science. White, T.S., McDowell, W.H., and Brantley, S.L. (2016): 2016 Fall Meeting, American Geophysical Union, San Francisco, CA, 12-16 Dec.
Critical Zone Science as a Multidisciplinary Framework for Teaching Earth Science and Sustainability. Wymore, A.; White, T.S.; Dere, A.L.D.; Hoffman, A.; Washburne, J.C.; Conklin, M.H. (2016): Fall Meeting, American Geophysical Union, December 2016. Abstract ED13E-0954.
Quantifying present-day and long-term shale weathering rates across a latitudinal climosequence. Dere, Ashlee Laura Denton, Elizabeth Andrews and Timothy S White (2015): EP34A-06 Landscape Evolution from a Critical Zone Science Perspective III, presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec.
CZO National Office Annual Report 2015 . Derry, L (2015): CZO National Office, Cornell University National
Common Critical Zone Observatory (CZO) Infrastructure and Measurements. J. Chorover, S. Anderson, A. K. Aufdenkampe, R. C. Bales, S. L. Brantley, W. Dietrich, P. Kumar, K. A. Lohse, W. McDowell, D. Richter, T. White (2015): A Guide Prepared By CZO PIs, May 05, 2015 Cross-CZO National
The interplay of regolith evolution and watershed hydrodynamics in a first order watershed. Sullivan P.L., Hynek, S., Gu, X., Singha, K., White, T., West, N., Kim, H., Clarke, B., Kirby, E., Duffy, C., and Brantley, S.L (2015): 2015 Goldschmidt Conference, Prague, CZ, 16-21 Aug
IN SITU MEASUREMENTS TO QUANTIFY PRESENT DAY SHALE WEATHERING RATES. ANDREWS, Elizabeth M., DERE, Ashlee L., and WHITE, Timothy (2014): GSA Northeastern Section 49th Annual Meeting 23–25 March 2014
QUANTIFYING SHALE WEATHERING RATES AS A FUNCTION OF CLIMATE. DERE, Ashlee, WHITE, Timothy S., and BRANTLEY, Susan L. (2014): GSA Northeastern Section 49th Annual Meeting 23–25 March 2014
EP23B-3601 Systematic Investigation of REE Mobility and Fractionation During Continental Shale Weathering Along a Climate Gradient . Lixin Jin • Lin Ma • Ashlee Dere • Tim White • Susan Brantley (2014): 2014 AGU Annual Fall Meeting, San Francisco, CA, Dec 15-19th
EP23E-3634 The Interplay of Regolith Evolution and Watershed Hydrodynamics on Shale Weathering Fluxes . Pamela Sullivan • Scott Hynek • Kamini Singha • Tim White • Xin Gu • Christopher Duffy • Susan Brantley (2014): 2014 AGU Annual Fall Meeting, San Francisco, CA, Dec 15-19th
The interplay of regolith evolution and watershed hydrodynamics at Susquehanna Shale Hills CZO Critical Zone All Hands Meeting, Yosemite Park CA . Sullivan PL, Hynek S, Singha K, White T, Gu X, Russo T, Kim H, Duffy C, Clarke B, and Brantley SL. (2014): Presented at the NSF National Critical Zone Observatory Program All Hands Meeting, Yosemite, CA, 21-24 Sept., 2014
EP13E-06 Rates of tree throw in Appalachian shale landscapes . Timothy White and Ashlee Dere (2014): 2014 AGU Annual Fall Meeting, San Francisco, CA, Dec 15-19th
ARBORTURBATION RATES IN THE APPALACHIAN MOUNTAINS. WHITE, Tim, SHARKEY, Sarah, and DERE, Ashlee L (2014): GSA Northeastern Section 49th Annual Meeting 23–25 March 2014
ARBORTURBATION RATES OF SOIL ON APPALACHIAN MOUNTAIN SHALE LANDSCAPES. WHITE, Timothy S., DERE, Ashlee L., and SHARKEY, Sarah (2014): 2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)
Differences in shale weathering on ridgetops and slopes along a latitudinal climosequence. A. L. Dere, T. S. White, L. E. Leidel AND S. L. Brantley (2013): Mineralogical Magazine 77:976
Sustaining Earth's Critical Zone - Basic Science and Interdisciplinary Solutions for Global Challenges. Banwart, S., Chorover, J., Gaillardet, J., Sparks, D., White, T., et al. (2013): The University of Sheffield, United Kingdom, ISBN: 978-0-9576890-0-8 Cross-CZO National
Critical Zone Science and Observatories. Brantley, S.L., White, T.S., Anderson, S.P., Bales, R.C., Chorover, J., McDowell, W.H. (2013): Abstract TH15D-01 presented at 2013 Fall Meeting, AGU, San Francisco, CA, 9-13 Dec. Cross-CZO National
Assessing the Extent of Reaction Versus Depth at Ridgetops and Hillslopes to Understand Controls on Denudation. BRANTLEY, Susan L., DERE, Ashlee, LEBEDEVA, Marina, WHITE, Timothy (2013): GSA Annual Meeting
Mineralogical Transformations During Shale Weathering from Puerto Rico to Wales . Dere, A.L., White T.S., April R.H., and Brantley S.L (2013): GSA Southeastern Section Meeting
AGI LiDAR Handout. Harpold, A.A. and T.S. White (2013): AGI 2013 handout National
Rose Hill Shale Weathering Across a Climate Gradient in the Appalachian Mountains. Trowbridge, P (2013): Bachelor of Science, Pennsylvania State University
Bioturbation and Erosion by Tree Throw in Forested Landscapes, Appalachian Mountains . WHITE, Timothy S., SHARKEY, Sarah, and DERE, Ashlee (2013): GSA Cordilleran Section Meeting
Sustaining Earth's Critical Zone. Banwart, S., Chorover, J., Sparks, D., White, T. (2012): Report of the International Critical Zone Observatory Workshop. 8th-11th November, 2011, U. Delaware (USA). National
Critical Zone Observatories (CZOs): Integrating measurements and models of Earth surface processes to improve prediction of landscape structure, function and evolution (Invited). Chorover J., Anderson S. P., Bales R. C., Duffy C., Scatena F. N., Sparks D. L., White T. (2012): Abstract GCS4A-05 presented at 2012 Fall Meeting, AGU, San Francisco, Calif., 3-7 Dec (Talk) Cross-CZO National
Critical Zone Observatories (CZOs): Integrating measurements and models of Earth surface processes to improve prediction of landscape structure, function and evolution (Invited). Chorover, J., Anderson, S.P., Bales, R.C., Duffy, C., Scatena, F.N., Sparks, D.L., and White, T. (2012): Fall Meeting, American Geophysical Union, December 2012. Abstract GC54A-05. National
Common Critical Zone Observatory Infrastructure and Measurements. J. Chorover, F.N. Scatena, T. White, S. Anderson, A.K. Aufdenkampe, R.C. Bales, S.L. Brantley, G. Tucker. (2012): A Guide Prepared By CZO PIs, September 27, 2012 Cross-CZO National
Using U-series isotopes to quantify regolith formation and chemical weathering rates along a climosequence associated with the Susquehanna Shale Hills Critical Zone Observatory (Invited). Ma, L., Chabaux, F.J., Dere, A.L., White, T., Jin, L., Brantley, S.L. (2012): AGU Annual Fall Conference Proceedings
How lithology and climate affect REE mobility and fractionation along a shale weathering transect of the Susquehanna Shale Hills Critical Zone Observatory. Ma, L., Jin, L., Dere., A.L., White, T., Mathur, R., Brantely, S.L. (2012): AGU Annual Fall Conference Proceedings
Fracture Patterns within the Shale Hills Critical Zone Observatory (Invited). Singha, K., White, T., Perron, J., Chattopadhyay, P.B., Duffy, C. (2012): AGU Annual Fall Conference Proceedings
Quantifying rates and mechanisms of shale weathering across a continental-scale climosequence. Brantley, S.L., Dere A.L. and White T.S. (2011): Goldschmidt
Shale weathering on slopes across a latitudinal climosequence. Leidel, L, Dere, A.L., White, T. (2011): AGU Annual Fall Conference Proceedings
Bioturbation of forested shale soils by tree throw in the Appalachian Mountains. Mann, E., Downy, K., Dere, A.L., White, T. (2011): AGU Annual Fall Conference Proceedings
Frontiers in Exploration of the Critical Zone: Report of a workshop sponsored by the National Science Foundation (NSF), October 24-26, 2005. Brantley, S., White, T.S., White, A.F., Sparks, D., Richter, D., Pregitzer, K., Derry, L., Chorover, J., Chadwick, O., April, R., Anderson, S., Amundson, R., (2006): Newark, DE, 30 pp. National
27 Apr 2018 - CZO Newsletter CZNews: Spring 2018
02 Mar 2018 - This manuscript, led by Dan Richter with six Calzones co-authors, was just submitted to Biogeosciences Discussions.
01 Jan 2018 - A 15-week semester-long upper-level undergraduate course curriculum entitled “Introduction to Critical Zone Science” is now available free online.
31 Oct 2017 - This issue of In the Trenches explores the richly interdisciplinary concept of the Critical Zone (CZ).
01 May 2017 - CZO Newsletter CZNews: Spring 2017
30 Nov 2016 - Members of the CZO National Office continue to hold workshops, presentions, posters and events in an effort to integrate CZ science at the K-12 and...
11 Jan 2016 - The CZO National Office Newsletter CZNews: Winter 2016
01 Oct 2015 - The CZO National Office Newsletter CZNews: Fall 2015
18 Sep 2015 - “Hydrosphere! Lithosphere! Atmosphere! Biosphere!” students and teachers shouted during orientation for this summer’s Critical...
14 Aug 2015 - The Stroud Water Research Center does more than count bugs in streams. As a result of its educational and scientific projects, hundreds of students...
10 Jun 2015 - Funded by the National Science Foundation, eight REU/RET participants with Susquehanna Shale Hills Critical Zone Observatory joined seven...
30 Mar 2015 - The CZO National Office introduces a quarterly newsletter: CZNews!
26 Aug 2014 - The Critical Zone Observatory Research Experience for Undergraduates and Research Experience for Teachers program participants traveled to...
17 Jun 2014 - A CZO National Office (CZONO) has been announced, directed by Lou Derry (Cornell) with coordination activities led by Tim White (Penn State).
10 Jun 2014 - CZO and AGI create succinct exercises for secondary education classrooms. The exercises are based on CZO data and were distributed to 16,000 teachers
06 May 2014 - Critical Zone Science & Management Class ENVS‐GEO‐HWR 422/522 in Fall 2014
04 Nov 2013 - CZO researchers presented the results of various scientific studies at the 125th annual meeting of the Geological Society of America.
29 Jul 2013 - International CZ science community outlines interdisciplinary research needed to address land use changes, climate change, and biodiversity decline
06 Jun 2013 - During the week of May 19, five faculty members interested in Critical Zone science traveled to Northfield, MN to participate in an InTeGrate...
28 May 2013 - Exploring the Critical Zone with LiDAR: A Hands-On Exercise
26 Apr 2013 - Utilizing the Shale Hills CZO and beyond, four senior geosciene majors from the College of Earth and Mineral Science at Penn State presented...
01 Apr 2013 - CZO K-12 teacher short course to be offered at the 125th anniversary, annual meeting of the Geological Society of America in Denver, October 27-30, 20
01 Apr 2013 - CZO education and outreach team receives funding from NSF-sponsored InTeGrate project to develop an undergraduate course in Critical Zone science.
27 Feb 2013 - It is with great pleasure we announce a fourth award has been granted on the RFP seed grant for collaborative research at Shale Hills. The...
30 Aug 2012 - The European magazine, International Innovation Environment, published bi-annually, focused the August issue on "How science must lead the way to a...
27 Aug 2012 - It is with great pleasure we announce that Ashlee Dere, PhD Candidate Geosciences, has been awarded Winner of the poster and oral presentation...
GSA Joint Northeastern-North Central Section Meeting
Omni William Penn Hotel, Pittsburgh, PA.
Town Hall: Critical Zone Observatories: Platforms for Collaborative Science
AGU Meeting, San Francisco, CA.
CZO Research Experience for Undergraduates and Teacher
Shale Hills CZO (Penn State) and Stroud Water Research Cente.
AGU 2015: A Town Hall for the Network of Critical Zone Observatories (TH25D)
San Francisco, CA - Moscone Center, Moscone West - 2010.
Critical Zone Observatories/Long Term Ecological Research Network Collaboration
2015 LTER All Scientists Meeting- Estes Park, CO.
Investigating shale weathering across the Shale Transect
118 ASI Building.
Tree throw mini symposium featuring Eric Kirby, Rudy Slingerland and Tim White
301 Steidle Building.
CZO Summer Field Course
SSHCZO and CZO Shale Transect sites in NY, VA, TN, and AL.