Julie Pett-Ridge
Curriculum Vitae
3017 ALS Building
Department of Crop and Soil Sciences
Oregon State University, Corvallis, OR, 97331
Phone: (541) 737-1236
Julie.Pett-Ridge@oregonstate.edu
EDUCATION
Ph.D.
A.B.
Isotope Geochemistry and Biogeochemistry, Cornell University, Ithaca, NY, 2007
Environmental Earth Science, Dartmouth College, Hanover, NH, 1997
EMPLOYMENT
2009 -
Assistant Professor, Department of Crop and Soil Sciences, Oregon State
University
2011 Adjunct Assistant Professor, Ocean Ecology and Biogeochemistry, and Geology
and Geophysics, College of Earth, Ocean, and Atmospheric Science, Oregon State
University
2007- 2009 Natural Environment Research Council Research Fellow, Department of Earth
Sciences, University of Oxford
PUBLICATIONS
(My students denoted with an asterisk.)
Perakis, S.S., Pett-Ridge, J.C., and Catricala, C.E. (in review) Nutrient feedbacks to soil
heterotrophic nitrogen fixation in forests. Ecology.
Hynicka, J.D.*, Pett-Ridge, J.C., and Perakis, S.S. (in review) Biological nitrogen enrichment
regulates calcium sources in forests. Nature Geoscience.
McClintock, M.*, McDowell, W.H., Gonzalez, G., Schulz, M., and Pett-Ridge, J.C. (in review)
African dust deposition in Puerto Rico: analysis of a 20-year rainfall chemistry record
and comparison with models. Journal of Geophysical Research Atmospheres.
McClintock, M.*, Brocard, G., Willenbring, J., Tamayo, C., Porder, S., and Pett-Ridge, J.C.
(2015) Spatial variability of African dust in soils in a montane tropical landscape in
Puerto Rico. Chemical Geology 412:69-81.
Marks, J.A.*, Perakis, S.S. King, E.K.*, and Pett-Ridge, J.C. (2015) Soil organic matter
regulates molybdenum storage and mobility in forests. Biogeochemistry.
Marks, J.*, Pett-Ridge, J.C., Perakis, S., Allen, J., and McCune, B. (2015) Response of the
nitrogen-fixing Lobaria pulmonaria to phosphorus, molybdenum, and vanadium.
Ecosphere, 6(9) 155.
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Siebert, C., Pett-Ridge, J.C., Halliday, A.N., and Burton, K.W. (2015) Soil Molybdenum Isotope
Fractionation across climate and age gradients. Geochimica et Cosmochimica Acta.
162:1-24.
Porder, S., Johnson, A., Brocard, G., Goldsmith, G., Hao, X., and Pett-Ridge, J.C. (2015)
Linking geomorphology, weathering, and cation availibility in the Luquillo Mountains of
Puerto Rico. Geoderma. 249-250:100-110.
King, E.K.*, A. Thompson, C. Hodges, and J.C. Pett-Ridge. (2014) Towards understanding
temporal and spatial patterns of molybdenum in the critical zone. Procedia Earth and
Planetary Science, 10: 56-52.
Keech, A.R.*, A.J. West, J.C. Pett-Ridge, G.M. Henderson. (2013) Calibrating U-series tools for
weathering rate and duration of a soil sequence on known ages. Earth and Planetary
Science Letters. 374: 24-35.
Brantley, S.L., J.P. Megonigal, F.N. Scatena, Z. Balogh-Brunstad, R.T. Barnes, M.A. Bruns, P.
van Cappelen, K. Dontsova, H. Hartnett, T. Hartshorn, A. Heimsath, E. Herndon, L. Jin,
C.K. Keller, J.R. Leake, W.H. McDowell, F.C.. Meinzer, T. Mozder, S. Petsch, J. PettRidge, P. Raymond, C.S. Riebe, K. Shumaker, A. Sutton-Grier, R. Walter, and K. Yoo.
(2011) Twelve testable hypotheses on the geobiology of weathering. Geobiology 9(2)
140-165.
Pett-Ridge, J. C. (2009) Contributions of dust to phosphorus cycling in tropical forests of the
Luquillo Mountains, Puerto Rico. Biogeochemistry, 94: 63-80.
Pett-Ridge, J. C., J. K. Barrows, and L. A. Derry. (2009) Ca/Sr and 87Sr/86Sr ratios as tracers of
Ca and Sr cycling and inputs in a humid tropical forest. Chemical Geology. 267: 32-45.
Pett-Ridge, J.C., L. A. Derry, and A. C. Kurtz. (2009) Sr isotopes as a tracer of weathering
processes and dust inputs in a tropical granitoid watershed, Luquillo Mountains, Puerto
Rico. Geochimica et Cosmochimica Acta, 73, 25-43.
Pett-Ridge, J. C., V. M. Monastra, L. A. Derry, and O. A. Chadwick. (2007) Importance of
atmospheric inputs and Fe-oxides in controlling soil uranium budgets and behavior along
a Hawaiian chronosequence. Chemical Geology, 244, 691-707.
Derry, L. A., J. C. Pett-Ridge, A. C. Kurtz, and J. Troester. (2006) Ge/Si and 87Sr/86Sr tracers
of weathering reactions and hydrologic pathways in a tropical granitoid system. Journal
of Geochemical Exploration 88 (1-3) 271-274.
CONFERENCE PRESENTATIONS
*Indicates invited conference presentations.
*Pett-Ridge, J.C. (2015) Top-down, bottom-up, and longer-term views of critical zone evolution
based on isotopic tracers. Workshop on Hydro-Biogeochemical Processes: Mechanisms,
Coupling, and Impact. China University of Geosciences, Wuhan, China.
Pett-Ridge, J.C., Hynicka, J., Perakis, S.S. (2015) Biological nitrogen enrichment shifts longterm calcium sources from weathering to atmospheric inputs. AGU Fall Meeting, San
Francisco, CA
McCarthy, A., Selker, J., Pett-Ridge, J.C. (2015) Impact of Aquifer Heterogeneities on
Autotrophic Denitrification. AGU Fall Meeting, San Francisco, CA
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King, E.K., and Pett-Ridge, J.C. (2015) Molybdenum isotopes and mass balance during early
stages of pedogenesis. AGU Fall Meeting, San Francisco, CA.
Pett-Ridge, J.C., and Perakis, S.S. (2015) Subsurface architecture controls water flowpaths and
biogeochemical fluxes in the H.J. Andrews Experimental Forest. LTER All Scientists
Meeting. Estes Park, CO.
King, E.K., and Pett-Ridge, J.C (2015) Molybdenum isotopes and soil processes on a Kona
climate gradient. Hawaii Ecosystems Meeting, Hilo HI.
Pett-Ridge, J.C, and King, E.K. (2015) Trace element patterns in Hawaiian soils. Hawaii
Ecosystems Meeting, Hilo HI.
Marks, J.A., Pett-Ridge, J. C., Perakis, S.S. (2015) Response of the nitrogen-fixing lichen
Lobaria Pulmonaria to phosphorus and micronutrients. Soil Science Society of America
Meeting, Minneapolis MN.
Hynicka, J., Pett-Ridge, J.C., Perakis, S.S. (2015) Biological nitrogen enrichment shifts longterm calcium sources from weathering to atmospheric inputs. Ecological Society of
America, Baltimore MD.
Marks, J.A., Pett-Ridge, J. C., Perakis, S.S., Allen, J.L., and McCune, B. (2015) Response of the
nitrogen-fixing lichen Lobaria Pulmonaria to phosphorus and micronutrients. Northwest
Scientific Association, Pasco WA.
Pett-Ridge, J.C, Siebert, C., Opfergelt, S., Burton, K., and Halliday, A. (2014) Molybdenum
isotope fractionation in the critical zone. AGU Fall Meeting, San Francisco, CA.
*Pett-Ridge, J.C, (2014) Combined radiogenic and cosmogenic isotope tracers of dust deposition
variability. Soil Science Society of America Meeting, Long Beach, CA.
*Pett-Ridge, J.C, (2014) Top-down, bottom-up, and longer-term views of geologic controls of
soils. Soil Science Society of America Meeting, Long Beach, CA.
King, E.K., A. Thompson, C. Hodges, and J.C. Pett-Ridge. (2014) Towards understanding
temporal and spatial patterns of molybdenum in the critical zone. Geochemistry of the
Earth’s Surface-10. Paris, France
McClintock, M., and Pett-Ridge J, (2014) Controls on African Dust Deposition across the
Luquillo Mountains, Puerto Rico. Goldschmidt Conference, Sacramento, CA.
King, E., Thompson, A., Hodges, C. and Pett-Ridge J. (2014) Pedogenic fractionation of
molybdenum isotopes on a Hawaiian climate gradient. Goldschmidt Conference,
Sacramento, CA.
Marks, J.A., Perakis, S.S., and Pett-Ridge, J.C. (2014) Distribution of soil molybdenum across a
soil nitrogen gradient. Goldschmidt Conference, Sacramento, CA.
Marks, J.A., Perakis, S.S., and Pett-Ridge, J.C. (2014) Molybdenum as a micronutrient in
Oregon Coast Range soils. Oregon Society of Soil Scientists, Bend,OR.
Hynicka, J., Pett-Ridge, J.C., and Perakis, S.S. (2013) Long-term controls on ecosystem calcium:
Nitrogen accumulation versus bedrock weathering. Ecological Society of America
meeting, Minneapolis, MN.
King, E., Thompson, A., and Pett-Ridge, J. C. (2013) Investigating Mo fractionation across a
Maui climate gradient. Hawaii Ecosystems Project Annual Meeting, Hilo, HI.
Pett-Ridge, J.C, (2013) Towards measuring timescales for Hawaiian soil processes. Hawaii
Ecosystems Project Annual Meeting, Hilo, HI.
Siebert C., and Pett-Ridge, J.C. Molybdenum isotopes as a proxy for soil processes.
EnvironMetal Isotopes (EMI2013) Ascona, Switzerland.
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McClintock, M., and Pett-Ridge, J.C. (2013) Topographical Controls on dust deposition in the
Luquillo Mountains, Puerto Rico. Oregon Society of Soil Scientists meeting, Troutdale,
OR.
Pett-Ridge, J.C, Krett, W., Curcio, N., and Kleber, M. (2012) Investigating controls on chemical
weathering in the Cascade Mountains, Oregon. Geochimica et Cosmochimica Acta
Suppl. S.
Thompson, A., and Pett-Ridge, J. C. (2012) Pedogenic fractionation of Fe and Mo isotopes: The
role of soil. Hawaii Ecosystems Project Annual Meeting, Hilo, HI.
Pett-Ridge, J.C. and Kleber, M. (2011) An investigation of controls on chemical weathering in
the Cascade Mountains of Oregon. AGU Fall Meeting, San Francisco, CA.
Siebert, C., Pett-Ridge, J.C., Halliday, A.N., and Burton, K.W. (2011) Molybdenum Isotopes and
Soil Processes. AGU Fall Meeting, San Francisco, CA.
*Pett-Ridge, J. C. (2009) Dust-derived phosphorus in tropical forests of the Luquillo Mountains,
Puerto Rico. AGU Fall Meeting, San Francisco, CA.
Siebert, C., Pett-Ridge, J. C., Burton, K., Halliday, A.N. (2009) Complex Molybdenum Isotope
Behavior During Weathering and Erosional Transport. AGU Fall Meeting, San
Francisco, CA.
Pett-Ridge, J. C. (2009) Dust-derived phosphorus in tropical forests of the Luquillo Mountains,
Puerto Rico. 6th International Symposium on Ecosystem Behavior: Biogeomon 2009.
Working Papers of the Finnish Forest Research Institute.
Pett-Ridge, J. C., Henderson, G.M., and Chadwick, O.A. (2009) Investigating Soil Processes
Across the Hawaiian Islands Using U-Series Nuclides. Geochimica et Cosmochimica
Acta 73 (13): Suppl. S., A1022.
Siebert, C., Pett-Ridge, J., Burton, K., Halliday, A. N. (2008) Application of Molybdenum
isotopes as proxy for weathering conditions. EOS Transactions. AGU, 89(53), Fall Meet.
Suppl., Abstract PP21B-1428.
Keech, A.R., Pett-Ridge, J. C., West, A.J., and Henderson, G.M. (2008) Calibrating U-Series
Tools for Weathering Rate and Duration on a Soil Sequence of Known Ages. Geochimica
et Cosmochimica Acta 72 (12): Suppl. S., A457.
Pett-Ridge, J. C., Siebert C., and Halliday, A. (2008) Molybdenum Isotopes as Proxy for Redox
Conditions during Weathering. Geochimica et Cosmochimica Acta 72 (12): Suppl. S.,
A741.
Pett-Ridge, J. C. (2008) Molybdenum and uranium-series isotopic tracers of soil development in
Hawaii Hawaii Ecosystems Project Annual Meeting, Hilo, Hawaii.
Pett-Ridge, J. C., and L. A. Derry. (2007) Characterizing Dust Inputs to the Caribbean Region
Using Radiogenic Isotopes. EOS Transactions. AGU, 88(52), Fall Meet. Suppl., Abstract
V13F-02.
Pett-Ridge, J. C. (2007) U-series investigation of soil development in Hawaii. Critical Zone
Exploration Network Data and Information Systems Workshop.
Pett-Ridge, J. C., L. A. Derry, and A.C. Kurtz. (2007) Quantifying mineral aerosol inputs and the
mobility of “immobile” elements in weathering studies. Geochimica et Cosmochimica
Acta 71 (15): Suppl. S., A782-A782.
Pett-Ridge, J. C., J. K. Barrows, and L. A. Derry. (2007) Ca/Sr and 87Sr/86Sr ratios as tracers of
Ca and Sr cycling in the Rio Icacos watershed. Gordon Conference on Catchment
Science: Interactions of Hydrology, Biology, and Geochemistry.
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C. Tonitto, G. M. Gettel, R. W. Howarth, J. C. Pett-Ridge, N. D. Bettez, R. A. Doyle, M. V.
Kulkarni, G. McIsaac, J. Moslemi, R. P. Phillips, S. M. Raciti, and D. M. Vallano. (2007)
Energy balance and environmental impacts of biofuel production. United States Society
for Ecological Economics, 4th biennial conference.
Pett-Ridge, J. C. and L. A. Derry. (2006) U-series disequilibrium investigation of a weathering
profile in a tropical granitoid watershed, Luquillo Puerto Rico. Geochimica et
Cosmochimica Acta 70 (18): Suppl. S., A487-A487.
Pett-Ridge, J. C, A. C. Kurtz, and L. A. Derry. (2005) Tracing Solute Sources in a Small
Tropical Granitoid Watershed. EOS Transactions. AGU Fall Meet. Suppl., Abstract
H31D-1330, 2005.
Pett-Ridge, J. C., A. C. Kurtz, and L. A. Derry. (2005) 87Sr/86Sr investigation of weathering
reactions in a tropical granitoid watershed. Abstracts of Papers, Earth Surface Processes
2, Calgary, Alberta.
Pett-Ridge, J. C., A. C. Kurtz, L. A. Derry, and J. Troester. (2004) A Ge/Si, 234U/238U, and
87Sr/86Sr investigation of weathering reactions and flowpaths in a tropical granitoid
watershed. Geochimica et Cosmochimica Acta 68 (11): Suppl. S., A446-A446.
Pett-Ridge, J. C., V. M. Monastra, L. A. Derry, and O. A. Chadwick. (2002) Importance of Dust
Deposition and Fe-oxides to the Geochemistry of Uranium in Soils Along a Hawaiian
Chronosequence. EOS Transactions. AGU, 83(47), Fall Meet. Suppl. Abstract V22B1227.
Professional Affiliations
Listed Participant, H.J. Andrews LTER
Listed Participant, Luquillo CZO
Geochemical Society
Geological Society of America
American Geophysical Union
Critical Zone Exploration Network
European Association of Geochemistry
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