John W. Jenson
Professor of Environmental Geology
Water & Environmental Research Institute of the Western Pacific
University of Guam
Mangilao, GU 96923
Phone: 671-735-2689 (fax 734-8890) (GMT+10 hrs)
[email protected]
| RESEARCH | Research Interests | Projects | |
| PUBLICATIONS: |
RESEARCH INTERESTS
Dr. Jenson’s research encompasses applied as well as fundamental aspects of groundwater hydrology and related environmental science. Current work on local groundwater resources includes numerical modeling of flow in the young carbonate aquifer of Guam and atolls of the adjacent Caroline Islands. Recent local work includes a dye trace investigation of Guam’s island karst aquifer, culminating this year in an evaluation of the background fluorescence in Guam’s coastal waters. Previous projects have included mapping the basement topography beneath the Northern Guam Lens Aquifer and evaluating trends in chloride concentration in Guam’s production wells. For the past decade, Dr. Jenson has collaborated with Dr. John Mylroie of Mississippi State University to extend and apply the Carbonate Island Karst Model to the region’s tectonically active limestone-capped islands: Guam, Saipan, Tinian, and Rota in the Mariana Islands, and most recently, to Fais, the one raised limestone island in the Carolines. Research on global-scale questions includes collaborative studies of the hydrology of the pseudo-karst aquifers at the base of continental ice sheets and the potential influence of saturated subglacial till on ice-sheet behavior. Current work also includes coordinating an update of the 40-year-old geologic map of Guam. Knowledge acquired on the caves and karst of the Mariana Islands has enabled a multi-disciplinary collaborative effort to evaluate the paleoclimate record from the western Pacific.
Using a year-long (2004) record of 30-minute interval data from an NGLA observation well and a 2-D SUTRA model of the aquifer’s principal sub-basin, we are evaluating the dynamic response of the freshwater lens to recharge events. This will soon be expanded to a 3-D model. A preliminary technical report is forthcoming. Expected completion date: July 2008. (Funding source: Guam Hydrologic Survey)
This project is centered around the development of a high-resolution 2-D SUTRA model of an idealized atoll aquifer, which will provide the basis for development of a simple algebraic model for application to water resource management in the Federated States of Micronesia. Expected completion date: July 2008. (Funding source: US Geological Survey)
The objective of this project is a more accurate model for evaluating water loss and infiltration through the soils on the Northern Guam Lens Aquifer (NGLA). It will eventually include a routing routine to efficiently compute the delay times for percolation and fast flow through the 60 to 180-m thick vadose zone of the NGLA. Expected completion: July 2008. (Funding source: Guam Hydrologic Survey)
Work is underway in collaboration with Dr. Jay Banner, University of Texas-Austin, to evaluate the quality of speleothems obtained from the Mariana Islands for documenting the paleoclimate of the western tropical Pacific Ocean. Still in its early stages, initial results from uranium series dating and stable oxygen and carbon analyses have been promising. (Funding source: Guam Hydrologic Survey)
Recent projects
Completed September 2007 (Hoffman, 2007), this project provided a comprehensive assessment of the background fluorescence in the groundwaters discharging into Guam’s coastal waters. The results will facilitate better design and more accurate interpretation of dye trace studies on Guam and other coastal areas with similar aquifers and climate. (see: WERI Technical Report 121) describes the project and the results. A manuscript is in preparation for publication. (Funding source: Guam Hydrologic Survey)
Completed in July 2006 (Sane et al., 2007), this project applied the Disturbed State constitutive model of Desai (2001) to evaluate the rheological characteristics of two Pleistocene tills (Carlson et al., 2004) deposited by the Laurentide Ice Sheet, with the objective of eventually providing an improved constitutive law for ice sheet modeling. A follow-on project has been proposed. (Funding source: National Science Foundation)
WERI will soon have available the first update of the geologic map of Guam since the original map (Tracey et al., 1964) was published over 40 years ago. The map incorporates the results of more than two decades of fieldwork by Dr. Mark Reagan, University of Iowa, and Dr. Galt Siegrist (WERI professor emeritus) and their students to update the map, render it into GIS coverages, and expand it from 15-minute to 7.5-minute quadrangles. Additional work is planned as funds become available. (Funding source: Guam Hydrologic Survey)
Completed in February 2006 (MacCracken, 2006), this project undertook a comprehensive assessment of the water resource utilization by residents of Fais, and the potential of its groundwater resources for meeting emergency needs (see WERI Technical Report 111). Results of a comprehensive survey of the island’s karst features and their implications for groundwater flow were presented at the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, Gerace Research Centre, San Salvador Island, Bahamas (Mylroie, Mylroie, Jenson & MacCracken, 2006, in review). (Funding source: US Geological Survey)
COURSESThis course covers groundwater physics, geology, and chemistry, well hydraulics and aquifer evaluation, and the principles and techniques of groundwater modeling. Each of these topics is examined in the context the Pacific island environment.
Team taught by Dr. Jenson and WERI meteorologist, Dr. Mark Lander, this course addresses the geologic and climate histories that have created the unique environment of the Pacific Basin and shaped the environments of Pacific Islands. It concludes with an examination of geologic and climatic hazards of concern to Pacific Island residents.
Also team taught by Dr. Jenson and Dr. Lander, the purpose of this course is to introduce students to the more complex and subtle aspects of the global warming debate in order to provide them with the basis for informed participation in research and professional work in environmental and other natural sciences.
One of the core courses of the university’s Environmental Science Program, this course is a survey of the key aspects of geology and engineering with which environmental scientists should be familiar. Team taught by the WERI faculty, topics include meteorology, surface hydrology, and groundwater hydrology.
PUBLICATIONS
Journal Articles
Technical Reports
Conference Proceedings
Abstracts and Presentations
Publications List
Journal Articles
Taboroši, D., Jenson, J. and Stafford, K., 2008, in press. Artefatosmilitares E Uso De Cavernas Durante a Segunda Guerra Mundial Nas Ilhas Marianas, Pacifico Oeaste [in Portuguese; English Title: Artifacts and Wartime Use of Caves in the Mariana Islands]. In: L.E.P. Travassos and L.A.V. Figueiredo (Editors), Antopoespeleologia: imaginário, religião eoutras relações humanas com as cavernas. Brazilian Speleological Society, Minas Gerais, Brazil.
Sane, S.M., Desai, C.S., Jenson, J.W., Contractor, D.S., Carlson, A.E. and Clark, P.U., 2007. Disturbed State Constitutive Modeling of Two Pleistocene Tills. Quaternary Science Reviews, 10.16/j.quascirev.2007.10.003.
Carlson, A.E., Jenson, J.W. and Clark, P.U., 2007. Modeling the Subglacial Hydrology of the James Lobe of the Laurentide Ice Sheet. Quaternary Science Reviews, doi: 10.1016/j.quascirev.2007.02.002.
Jenson, J.W., Keel, T.M., Mylroie, J.R., Mylroie, J.E., Stafford, K.W., Taborosi, D. and Wexel, C., 2006. Karst of the Mariana Islands: The Interaction of Tectonics, Glacio-Eustasy, Fresh-Water/Salt-Water Mixing in Island Carbonates. Geological Society of America Special Paper, 404: 129-138.
Stafford, K.W., Mylroie, J.E., Taboroši, D., Jenson, J.W. and Mylroie, J.R., 2005. Karst Development on Tinian, Commonwealth of the Northern Mariana Islands: Controls on Dissolution in Relation to the Carbonate Island Karst Model. Journal of Cave and Karst Studies, 67(1): 14-27.
Taboroši, D., Jenson, J.W. and Mylroie, J.E., 2005. Karst Features of Guam, Mariana Islands. Micronesica, 38(1): 17-46.
Carlson, A.E., Jenson, J.W. and Clark, P.U., 2004. Field Observations from the Tiskilwa Till, Il, and Sky Pilot Till, Mb of the Laurentide Ice Sheet. Geographie Physique et Quaternaire, 58: 229-239.
Stafford, K., Mylroie, J., Taboroši, D. and Jenson, J.W., 2004. Eogenetic Karst Development on a Small, Tectonically Active, Carbonate Island: Aguijan, Mariana Islands: Cave and Karst Science. Transactions of the British Cave Research Association, 31(3): 101-108.
Taborosi, D., Jenson, J.W. and Mylroie, J.M., 2004a. Karren Features in Island Karst: Guam, Mariana Islands. Zeitschrift fur Geomorphologie, 48: 369-389.
Gamble, D.W., Taborosi, D., Mylroie, J.E., Jenson, J.W., Carew, J.L., Jocson, J.M.U., Mylroie, J. and Vann, D.T., 2003. The Use of Water Temperature to Characterize Groundwater Discharge of a Coastal Fracture on Guam, U.S.A. Journal of Coastal Research, 19(2): 462-471.
Taboroši, D., Jenson, J.W. and Mylroie, J.E., 2003. Zones of Enhanced Dissolution and Associated Cave Morphology in an Uplifted Carbonate Island Karst Aquifer, Northern Guam, Mariana Islands. Speleogenesis and Evolution of Karst Aquifers, http://www.speleogenesis.info/archive/publication.php?Type=publication&PubID=3255, 1(4): 16.
Jocson, J.M.U., Jenson, J.W. and Contractor, D.N., 2002. Recharge and Aquifer Response: Northern Guam Lens Aquifer, Guam, Mariana Islands. Journal of Hydrology, 260: 231-254.
Taboroši, D. and Jenson, J.W., 2002. World War Ii Artefacts and Wartime Use of Caves in Guam, Mariana Islands. Cave Archaeology and Palaeontology Archive CAPRA 4, available at http://www.shef.ac.uk/~capra.
Mylroie, J.E., Jenson, J.W., Taborosi, D., Jocson, J.M.U., Vann, D.T. and Wexel, C., 2001. Karst Features on Guam in Terms of a General Model of Carbonate Island Karst. Journal of Cave and Karst Studies, 63(1): 9-22.
Mylroie, J.E. and Jenson, J.W., 2000a. The Carbonate Island Karst Model Applied to Guam. Theoretical and Applied Karstology, 13-14: 51-56.
Mylroie, J.R., Gamble, D.W., Taboroši, D.S., Jenson, J.W., Jocson, J.M.U. and Mylroie, J.E., 2000. Air and Water Cave Temperature Variation in Three Cave Types in Guam, USA: Implications for Aquifer Characteristics. Journal of Cave and Karst Studies, 62: 196-197.
Contractor, D.N. and Jenson, J.W., 2000. Simulated Effect of Vadose Infiltration on Water Levels in the Northern Guam Lens Aquifer. Journal of Hydrology, 229: 232-254.
Licciardi, J.M., Clark, P.U., Jenson, J.W. and MacAyeal, D.R., 1998. Deglaciation of a Soft-Bedded Laurentide Ice Sheet. Quat. Sci. Rev., 17: 427-448.
Clark, P.U., Licciardi, J.M., MacAyeal, D.R. and Jenson, J.W., 1997. Numerical Reconstruction of a Soft-Bedded Laurentide Ice Sheet During the Last Glacial Maximum: Reply. Geology, 25: 380-381.
Ho, C.L., Vela, J.C., Jenson, J.W. and Clark, P.U., 1996. Evaluation of Long-Term Time-Rate Parameters of Subglacial Till. ASCE Special Publication, 61: 122-136.
Clark, P.U., Licciardi, J.M., MacAyeal, D.R. and Jenson, J.W., 1996. Numerical Reconstruction of the Laurentide Ice Sheet During the Last Glacial Maximum. Geology, 24: 679-682.
McDonald, G.D., Clark, P.U., Bevis, K.A., Jenson, J.W., Hedlund, C., Patrick, M., Licciardi, J.M. and DesMarais, B.D., 1996, submitted. Variations in Net Mass Balance for Collier Glacier, Cascade Range, Oregon, 1989-1994. Journal of Glaciology.
Jenson, J.W., MacAyeal, D.R., Clark, P.U., Ho, C.L. and Vela, J.C., 1996. Numerical Modeling of Subglacial Sediment Deformation: Implications for the Behavior of the Lake Michigan Lobe, Laurentide Ice Sheet. Journal of Geophysical Research, 101(B4): 8717-8728.
Jenson, J.W., Clark, P.U., MacAyeal, D.R., Ho, C.L. and Vela, J.C., 1995. Numerical Modeling of Advective Transport of Saturated Deforming Sediment beneath the Lake Michigan Lobe, Laurentide Ice Sheet. Geomorphology, 14: 157-166.
Technical Reports
Hoffman, S.M. and Jenson, J.W., 2007. Background Fluorescence in Guam's Coastal Waters. WERI Technical Report no. 121, Water & Environmental Research Institute of the Western Pacific, Mangilao.
Bailey, R.T. and Jenson, J.W., 2007a. User's Manual for Estimating Atoll Groundwater Resources. WERI Technical Report no. 120, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Bailey, R.T. and Jenson, J.W., 2007b. Groundwater Studies of Atoll Islands. WERI Technical Report no. 119, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Keel, T.M., Mylroie, J.E. and Jenson, J.W., 2007. A Preliminary Report on the Sabana Watershed/Talakhaya Springs System, Rota (Luta), Cnmi. WERI Technical Report no. 114, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
MacCracken, R.S. and Jenson, J.W., 2007. Water Resource Analysis Fo Fais Island, Federal States of Micronesia. WERI Technical Report no. 111, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Keel, T.M., Mylroie, J.E. and Jenson, J.W., 2005. The Caves and Karst of Rota Island, Commonwealth of the Northern Mariana Islands. WERI Technical Report no. 107, Water & Environmental Institute of the Western Pacific, University of Guam., Mangilao.
Stafford, K.W., Mylroie, J.E. and Jenson, J.W., 2004. Karst Geology of Aguijan and Tinian, Cnmi Cave Inventory and Structural Analysis of Development. WERI Technical Report no. 106, Water & Environmental Institute of the Western Pacific, University of Guam, Mangilao.
Keel, T.M., Mylroie, J.E. and Jenson, J.W., 2004. Preliminary Report on the Caves and Karst of Rota (Luta), Cnmi. WERI Technical Report no. 105, Water and Environmental Institute of the Western Pacific, University of Guam, Mangilao.
Taboroši, D., Jenson, J.W. and Mylroie, J.E., 2004. Karst Features of Guam, Mariana Islands. WERI Technical Report no. 104, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
McDonald, M.Q. and Jenson, J.W., 2003a. Chloride History and Trends of Water in Production Wells in the Nothern Guam Lens Aquifer. WERI Technical Report no. 98, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Moran, D.C. and Jenson, J.W., 2004. Dry Trace of Groundwater from Guam International Airport and Harmon Sink to Agana Bay and Tumon Bay. WERI Technical Report no. 97, Water and Environmental Institute of the Western Pacific, University of Guam, Mangilao.
Stafford, K.W., Mylroie, J.E. and Jenson, J.W., 2002. Karst Geology and Hydrology of Tinian and Rota (Luta), Cnmi: A Preliminary Report. WERI Technical Report no. 96, Water and Environmental Institute of the Western Pacific, University of Guam, Mangilao.
Lander, M.A., Jenson, J.W. and Beausoliel, C., 2001. Responses of Well Water Levels on Northern Guam to Variations in Rainfall and Sea Level. WERI Technical Report no. 94, Water and Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Contractor, D.N. and Jenson, J.W., 1999a. Simulated Effect of Vadose Infiltration on Water Levels in the Northern Guam Lens Aquifer. WERI Technical Report no. 90, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Mylroie, J.E., Jenson, J.W., Jocson, J.M.U. and Lander, M., 1999. Karst Geology and Hydrology of Guam: A Preliminary Report. WERI Technical Report no. 89, Water and Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Jocson, J.M.U., Jenson, J.W. and Contractor, D.N., 1999a. Numerical Modeling and Field Investigation of Infiltration, Recharge, and Discharge in the Northern Guam Lens Aquifer. WERI Technical Report no. 88, Water and Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Jenson, J.W. and Jocson, J.M.U., 1998. Hydrologic Data Collection on Guam: Fy 1998 Report. WERI Technical Report no. 83, Water & Environmental Research Institute of the Western Pacific, University of Guam, Mangilao.
Conference Proceedings
Mylroie, J.E., Mylroie, J.R., Jenson, J.W. and MacCracken, R.S., 2006 (in press). Fresh-Water Lens Anisotropy and Flank Margin Cave Development, Fais Island, Federated States of Micronesia, Thirteenth symposium on the geology of the Bahamas and other carbonate regions, Gerace Research Center, San Salvador Island, Bahamas.
Keel, T.M., Jenson, J.W., Mylroie, J.E., Mylroie, J.R., Stafford, K.W. and Camacho, R., 2004. The Caves of Rota, Commonwealth of the Northern Mariana Islands. In: R.L. Davis and D.W. Gamble (Editors), Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, Gerace Research Center, San Salvador, Bahamas, pp. 76-87.
Reece, M.A., Mylroie, J.E. and Jenson, J.W., 2004. Notches in Carbonates: Origins and Implications. In: R.L. Davis and D.W. Gamble (Editors), Proceedings of the Twelvth Symposium on the Geology of the Bahamas and Other Carbonate Regions, Bahamian Field Station, San Salvador Island, Bahamas, pp. 143-152.
Stafford, K.W., Mylroie, J., E., Jenson, J.W., Mylroie, J.R. and Taboroši, D., 2004. Dissolution Controls Related to the Carbonaet Isladn Karst Model on Tectonically Active, Carbonate Islands: Tinian and Aguijan, Cnmi, 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, pp. 205-219.
Taborosi, D., Jenson, J.W. and Mylroie, J.E., 2004b. Karst Environments of Guam, Mariana Islands. In: R.L. Davis and D.W. Gamble (Editors), 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, Gerace Research Center, San Salvador, Bahamas, pp. 220-227.
Mylroie, J.E., Jenson, J.W., Mylroie, J.R. and Carew, J.L., 2004. Epikarst on Eogenetic Rocks. In: W.K. Jones, D.C. Culver and J.S. Herman (Editors), Epikarst Conference, pp. 132-134.
Mylroie, J.E. and Jenson, J.W., 2002. Karst Flow Systems in Young Carbonate Islands. In: J.B. Martin, C.M. Wicks and I.D. Sasowsky (Editors), Karst Frontiers: Florida and Related Environments. Karst Waters Institute Special Publication 7. Karst Waters Institute, Charles Town, West Virginia, pp. 107-110.
Mylroie, J.E., Mylroie, J.R. and Jenson, J.W., 2002. Modeling Carbonate Island Karst. In: R. Martin and B. Panuska (Editors), Eleventh symposium on the geology of the Bahamas and other carbonate regions, Gerace Research Center, San Salvador Island, Bahamas, pp. 135-144.
Gamble, D.W., Mylroie, J.E., Jenson, J.W., Carew, J.L., Taborosi, D., Jocson, J.M.U., Vann, D.T. and Mylroie, J.R., 2001. Freshwater Resources on Guam: Calculating Halocline Position and Fresh Water Discharge Via Temperature Profile, Proceedings of the 10th Pacific Science Intercongress, pp. 104.
Mylroie, J.E. and Jenson, J.W., 2001a. The Carbonate Island Karst Model, Proceedings of the 10th Pacific Science Intercongress, pp. 101.
Mylroie, J.E. and Jenson, J.W., 2000b. Guam and the Carbonate Island Karst Model. In: B.P. Onac and T. Tamas (Editors), Joint Meeting fo the Friends of Karst, Theoretical and Applied Karstology & IGCP 448, Cluj-Napoca, Romania, pp. 82-86.
Mylroie, J.E. and Jenson, J.W., 2000c. The Carbonate Island Karst Model. In: J.A. Ballwebber (Editor), Mississippi Water Resources Conference, Raymond, MS, pp. 371-375.
Contractor, D.N. and Jenson, J.W., 1999b. Simulated Effect of a Karstic Vadose Zone in the Northern Guam Lens on Well-Water Levels. In: A.N. Palmer, M.V. Palmer and I.D. Sasowsky (Editors), Karst Modeling. Karst Waters Institute Special Publication 5, Charlottesville, VA, pp. 175.
Jenson, J.W., 1999. Toward a Suitable Conceptual Model of the Northern Guam Lens Aquifer. In: A.N. Palmer, M.V. Palmer and I.D. Sasowsky (Editors), Karst Modeling. Karst Water Institute Special Publication 5, Charlottesville, VA, pp. 58.
Jocson, J.M.U., Jenson, J.W. and Contractor, D.N., 1999b. Hydrologic Insights from a Finite-Element Model of the Yigo-Tumon Sub-Basin, Northern Guam Lens Aquifer. In: A.N. Palmer, M.V. Palmer and I.D. Sasowsky (Editors), Karst Modeling. Karst Waters Institute Special Publication 5, Charlottesville, VA, pp. 174.
Jenson, J.W., Jocson, J.M.U. and Siegrist, H.G., 1997. Groundwater Discharge Styles from an Uplifted Pleistocene Island Karst Aquifer, Guam, Mariana Islands. In: B.F. Beck and J.B. Stephenson (Editors), The Engineering Geology and Hydrology of Karst Terranes. Balkema, Springfield, Missouri.
Presentations and Abstracts
Jenson, J.W., Desai, C.S., Clark, P.U., Contractor, D.S., Sane, S. and Carlson, A.E., 2006. A Unified Constitutive Model for Subglacial Till, Part I: The Disturbed State Concept, American Geophysical Union, Fall Meeting. AGU, San Fransico, pp. C31A-1222.
Desai, C.S., Sane, S., Jenson, J.W., Contractor, D.S., Carlson, A.E. and Clark, P.U., 2006. A Unified Constitutive Model for Subglacial Till, Part Ii: Laboratory Tests, Disturbed State Modeling, and Validation for Two Subglacial Tills, American Geophysical Union, Fall Meeting, San Francisco, pp. C31A-1223.
Stafford, K.W., Mylroie, J.E., Mylroie, J.R., Jenson, J.W. and Taborosi, D., 2004. Coves and Pocket Beaches: Littoral Erosion and Flank Margin Caves (Abstract)
Geological Society of America abstracts and programs, 36(5): 284.
Stafford, K.W., Taboroši, D., Keel, M., Mylroie, J.M., Mylroie, J.R. and Jenson, J.W., 2004. Joint Research Expeditions to Mariana Islands: Aguijan, Rota, and Tinian, National Speleological Society National Convention.
Stafford, K.W., Keel, T.M., Mylroie, J.E., Jenson, J.W. and Mylroie, J.R., 2003. Eogenetic Karst Development in the Mariana Islands: Aquijan, Rota, and Tinian (Abstract). Journal of cave and Karst Studies, 65(3): 188.
Stafford, K.W., Mylroie, J.E., Mylroie, J.R. and Jenson, J.W., 2003. Tinian, Cnmi: A Carbonate Island Karst Model Evaluation (Abstract)
Geological Society of America abstracts and programs, 35(1): 3.
McDonald, M.Q. and Jenson, J.W., 2003b. Historical Analysis of Chloride Ion Concentrations in Production Wells in the Northern Guam Lens Aquifer, Guam, Mariana Islands, Second International Conference on Saltwater Intrusion and Coastal Aquifers: Monitoring, Modeling and Management, Merida, Yucatan, Mexico.
Mylroie, J.E., Jenson, J.W., Mylroie, J.R. and Carew, J.L., 2003. Epikarst on Eogenetic Rocks (Abstract). Karst Waters Institute, pp. 17.
Keel, T.M., Stafford, K.W., Mylroie, J.E., Jenson, J.W. and Mylroie, J.R., 2003. The Carbonate Island Karst Model as Applied to Rota (Luta), Tinian, and Aguijan Islands, Commonwealth of the Northern Marian Islands (Abstract). Journal of Cave and Karst Studies, 65(3): 186.
Stafford, K.W., Mylroie, J.M., Taborosi, D., Keel, T.M. and Jenson, J.W., 2003. Structurally Controlled Eogenetic Karst: Mariana Islands. Geological Society of America Abstracts with Programs, 34(7): 452.
Stafford, K.W., Taborosi, D., Keel, T.M., Mylroie, J.E., Mylroie, J.R. and Jenson, J.W., 2003. 2002-2003 Joint Research Expeditions to the Mariana Islands: Aguijan, Rota, and Tinian (Abstract). Journal of Cave and Karst Studies, 65(3): 179.
Jenson, J.W., Mylroie, J.E., Mylroie, J.R. and Wexel, C., 2002. Revisiting the Carbonate Island Karst Model. Geological Society of America, Abstracts with Programs, 34(6): 226.
Taborosi, D. and Jenson, J.W., 2002. Fluviokarst on a Small Carbonate Island: Guam, Mariana Islands. Geological Society of America Abstracts with Programs, 34(6).
Mylroie, J.E., Mylroie, J.R., Jenson, J.W. and Wexel, C., 2001. Cave and Karst Development of Saipan (Abstract). Journal of Cave and Karst Studies, 63(3): 113.
Mylroie, J.E. and Jenson, J.W., 2001b. The Carbonate Island Karst Model, 10th Pacific Science Intercongress
pp. 101.
Gamble, D.W., Mylroie, J.E., Jenson, J.W., Carew, J.L.T., D., Jocson, J.M.U., Vann, D.T. and Mylroie, J.R., 2001. Freshwater Resources on Guam: Calculating Halocline Position and Fresh Water Discharge Via Temperature Profile. In: Proceedings (Editor), 10th Pacific Science Intercongress, pp. 104.
Wexel, C., Jenson, J.W., Mylroie, J.R. and Mylroie, J.E., 2001. Carbonate Island Karst of Saipan. Geological Society of America Abstracts with Programs, 33(6): A-6.
Gamble, D.W., Mylroie, J.R., Mylroie, J.E., Taboroši, D.S. and Jenson, J.W., 2000. Field Assessment of Coastal Fracture Discharge on the Northwest Coast of Guam Using Temperature Sensors, Limestone Island Aquifers Conference, University of Guam.
Mylroie, J.E. and Jenson, J.W., 2000d. The Carbonate Island Karst Model. Keynote Address, Limestone Island Aquifers Conference, University of Guam.
Reece, M.A., Mylroie, J.E. and Jenson, J.W., 2000. Cave and Karst Development on Guam: Implications for Aquifer History, Abstracts, National Speleological Society annual meeting, pp. A-15.
Reece, M.A., Mylroie, J.E. and Jenson, J.W., 2000 (abstract)-a. Notches in Carbonates: Paleohydrological Implications. In: A.a. Program (Editor), Tenth Symposium on the Geology of the Bahamas and other carbonate regions, Bahamian Field Station, San Salvador Island, Bahamas, pp. 21.
Mylroie, J.E. and Jenson, J.W., 2000e. The Carbonate Island Karst Model: Abstracts, National Speleological Society annual meeting, pp. A-15.
Reece, M.A., Mylroie, J.E. and Jenson, J.W., 2000 (abstract)-b. Cave and Karst Development on Guam: Implications for Aquifer History. In: Abstracts (Editor), National Speleological Society annual meeting, pp. A-15.
Mylroie, J.R., Gamble, D.W., Taborosi, D.S., Jenson, J.W., Jocson, J.M.U. and Mylroie, J.E., 2000. Air and Water Cave Temperature Variation in Three Cave Types in Guam, USA: Implications for Aquifer Characteristics (Abstract). In: P.a. Abstracts (Editor), National Speleological Society annual meeting, pp. A-15 - A-16.
Mylroie, J.E. and Jenson, J.W., 2000f. Cikm, the Carbonate Island Karst Model. Geological Society of America Abstracts with Programs, 32(7): A-355.
Jenson, J.W., Jocson, J.M. and Contractor, D.N., 1997. Hydrologic Observations of the Northern Guam Lens Aquifer, Fall 1997 Meeting, American Geophysical Union.
Vela, J.C., Jenson, J.W., Ho, C.L. and Clark, P.U., 1996. Long-Term Deformation of a Clayey Sandy Silt Till in Simple Shear between Yield and Failure Strength: Some Implications for Ice Sheet Behavior, Fall 1996 Meeting, American Geophysical Union.
Heitz, L.F., Denton, G.R.W., Jenson, J.W. and Siegrist, H.G., 1996. Water Crisis on Guam: Fact or Fiction?, College of Arts and Sciences Annual Symposium, University of Guam.
Jenson, J.W., MacAyeal, D.R., Clark, P.U., Ho, C. and Vela, J.C., 1995. Modeling of Sediment-Ice Sheet Interaction, Lake Michigan Lobe, Laurentide Ice Sheet. Eos Transactions: F276.
Contractor, D.N., Srivastva, R., Jenson, J.W., Jocson, J.M. and Siegrist, H.G., 1995. Modeling of the Anisotropic Northern Guam Aquifer Using a 2d, Fe Sharp-Interface Saltwater Intrusion Model. Eos Transactions, 76(46): F262.
Licciardi, J.M., Clark, P.U., Jenson, J.W. and McDonald, G.A., 1995. Modeling the Laurentide Ice Sheet through the Last Deglaciation, INQUA Meeting, pp. 50.
Clark, P.U., Licciardi, J.M. and Jenson, J.W., 1995. Dynamics of the Laurentide Ice Sheet During the Last Deglaciation, CANQUA Meeting, pp. CA7.
Heitz, L.F., Jenson, J.W., Siegrist, H.G. and Jocson, J.M., 1995. Geographic Information System (Gis) Applications to Groundwater Management on Guam, AWRA Annual Summer Symposium, Honolulu, HI.
Jenson, J.W. and Siegrist, H.G., 1994a. Bedrock Hydrogeologic Features Influencing Internal Transfer in the Northern Guam Lens Aquifer System. Eos Transactions, 75(43): 257.
Licciardi, J.M., Clark, P.U. and Jenson, J.W., 1994. Modeling the Laurentide Ice Sheet through the Last Deglaciation. Eos Transactions, 75, no. 43(43): supplement.
Jenson, J.W. and Siegrist, H.G., 1994b. A First Order Modeling Study of the Northern Guam Lens Aquifer, 1994 Pacific Northwest/Oceania Conference--Assessment of Models for Groundwater Resources Analysis and Management, Oahu, Hawaii.
Jenson, J.W., Clark, P.U., MacAyeal, D.R. and Alley, R.B., 1993. Implications of Unstable Behavior of the Laurentide Ice Sheet for Ice Dynamics and Climate Change: Experiments with an Ice Sheet Model. Eos Transactions, v. 74, no. 43, p. 360., 74(43): 360.
Jenson, J.W. and MacAyeal, D.R., 1992. Modeling of the Lake Michigan Lobe, Laurentide Ice Sheet, with Deforming Bed Dynamics. Eos Transactions, 73(43): 160.
Jenson, J.W., Bevis, K.A., Clark, P.U. and P.K., 1992. Mass Balance of Collier Glacier, Oregon Cascades. Geological Society of America, Abstracts with Programs, 24(5): 56.
Bevis, K.A., Jenson, J.W. and Wolter, M., 1992. Differentiating Geomorphic Surfaces in the Willamette Valley, Oregon, Based on Quantitative Soil Properties. Geological Society of America, Abstracts with Programs, 24(5): 56.