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Karen Ryberg

Statistician

Contact Info


Short Biography

Expertise/Projects/Research Interests:

  • Statistical analysis of hydrologic data, including parametric and nonparametric trend analysis and cluster analysis
  • Concentration trend analysis for pesticides in surface water
  • Research related to the impace of climate variability on surface water
  • Data mining including automated data retrieval and analysis, outlier detection, and data cleaning
  • Web access log analysis including usage patterns and trends, analysis of sessionized logs and navigation paths, data aggregation methods such as the Porter Stemming Algorithm
  • Graphical presentation of scientific data
  • R - Open Source Statistical Software
    • waterData package - ARetrieval, analysis, and anomaly calculation of daily hydrologic time series data
    • seawaveQ package - A model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables
  • Science Communication
  • Social Media
  • Scientific peer review

Education:

  • Doctorate of Philosophy, Environmental and Conservation Sciences - Environmental Science Track, 2015
    North Dakota State University, Fargo, North Dakota
    • Dissertation: The impact of climate variability on streamflow and water quality in the North Central United States
    • The Honor Society of Phi Kappa Phi
  • Master of Science, Statistics, 2006
    Colorado State University, Fort Collins, Colorado
    • Masters Project: Water-quality trend analysis for the Devils Lake Basin, North Dakota, January 1965 through September 2003
  • A.A.S, Computer Support Specialist, 2003
    Bismarck State College, Bismarck, North Dakota
    • Phi Theta Kappa Honor Society
  • B.A., Mathematics, 1995
    Luther College, Decorah, Iowa
    • The Phi Beta Kappa Society
    • Pi Mu Epsilon - Honorary National Mathematics Society
  • Graduate Certificate, Data Mining and Applications, 2008
    Stanford University, Stanford, California
  • Certificate, Management, 1996
    University of Mary, Bismarck, North Dakota




Publications

Ryberg, K.R., Akyüz, F.A., and Lin, W., 2015, Changes in total phosphorus concentration in the Red River of the North Basin, 1970-2012: American Society of Agricultural and Biological Engineers ASABE/CSBE North Central Intersectional Meeting, Fargo, N. Dak., April 10-11, 2015, paper number RRV15-054. [Link]

Ryberg, Karen R.; Lin, Wei; Vecchia, Aldo V., 2014. Impact of climate variability on runoff in the north-central United States. American Society of Civil Engineers , 11 p. [Link]

Ryberg, Karen R.; Vecchia, Aldo V.; Gilliom, Robert J.; Martin, Jeffrey D., 2014. Pesticide trends in major rivers of the United States, 1992-2010. U.S. Geological Survey Scientific Investigations Report 2014-5135, Report: vi, 63 p.; 2 Tables [Link]

Stone, Wesley W.; Gilliom, Robert J.; Ryberg, Karen R., 2014. Pesticides in U.S. streams and rivers: occurrence and trends during 1992-2011. Environmental Science & Technology American Chemical Society, 6 p. USGS news release http://www.usgs.gov/newsroom/article.asp?ID=3997. [Link]

Ryberg, Karen R.; Vecchia, Aldo V., 2013. seawaveQ: an R package providing a model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables. U.S. Geological Survey Open-File Report 2013-1255, Report: iv, 13 p.; Downloads Directory [Link]

Peterson, T.C.; Heim, R.; Hirsch, R.M.; Kaiser, D.; Brooks, H.; Diffenbaugh, N.S.; Dole, R., Giovannettone, J.; Guiguis, K.; Karl, T.R.; Katz, R.W.; Kunkel, K.; Lettenmaier, D.; McCabe, G.J.; Paciorek, C.J.; Ryberg, K.R.; Schubert, S.; Silva, V.B.S.; Stewart, B.; Vecchia, A.V.; Villarini, G.; Vose, R.S.; Walsh, J.; Wolock, D.; Wolter, K.; Woodhouse, C.A.; Wehner, M.; and Wuebbles, D., 2013, Monitoring and understanding changes in heatwaves, coldwaves, floods and droughts in the United States: State of knowledge: Bulletin of the American Meteorological Society, v. 94, no. 6, 821-834. NOAA National Climatic Data Center news release http://www.ncdc.noaa.gov/news/changes-heat-waves-cold-waves-floods-and-droughts-united-states. [Link]

Hirsch, R. M.; Ryberg, K. R., 2012. Has the magnitude of floods across the USA changed with global CO 2 levels? Hydrological Sciences Journal, v. 57, no. 1, 1-9. USGS news release http://www.usgs.gov/newsroom/article.asp?ID=3006. [Link]

Ryberg, Karen R.; Vecchia, Aldo V., 2012. waterData--An R package for retrieval, analysis, and anomaly calculation of daily hydrologic time series data, version 1.0. U.S. Geological Survey Open-File Report 2012-1168, Report: iv, 8 p.; Appendixes 1-2 [Link]

Ryberg, Karen R.; Vecchia, Aldo V.; Martin, Jeffrey D.; Gilliom, Robert J., 2010. Trends in pesticide concentrations in urban streams in the United States, 1992-2008. U.S. Geological Survey Scientific Investigations Report 2010-5139, viii, ; 42 p.; Appendices; Appendix 5 TXT; Appendix 6 TXT [Link]

Ryberg, Karen R.; Emerson, Douglas G.; Macek-Rowland, Kathleen M., 2009. Solid Precipitation Measurement Intercomparison in Bismarck, North Dakota, from 1988 through 1997. U.S. Geological Survey Scientific Investigations Report 2009-5180, vi, 24 p. [Link]

Ryberg, Karen R.; Hiemenz, Gregory, 2009. Summary and Analysis of Water-Quality Data for the Arrowwood National Wildlife Refuge, East-Central North Dakota, 1987-2004. U.S. Geological Survey Scientific Investigations Report 2009-5017, Report: vi, 92 p.; Supplements (xls) [Link]

Ryberg, Karen R., 2008. PFReports: A Program for Systematic Checking of Annual Peaks in NWISWeb. Geological Survey (U.S.) Open-File Report 2008-1284, iv, 18 p. [Link]

Ryberg, Karen R., 2007. Continuous Water-Quality Monitoring and Regression Analysis to Estimate Constituent Concentrations and Loads in the Sheyenne River, North Dakota, 1980-2006. Geological Survey (U.S.) Scientific Investigations Report 2007-5153, v, 22 p. [Link]

Ryberg, Karen R., 2007. Summary and Trend Analysis of Water-Quality Data for the Oakes Test Area, Southeastern North Dakota, 1984-2004. Geological Survey (U.S.) Scientific Investigations Report 2007-5056, iv, 118 p. [Link]

Ryberg, K. R.; Macek-Rowland, K. M.; Wiche, G. J.; Klapprodt, L. A., 2007. 10th Anniversary of the 1997 Red River Flood. General Information Publication 49, 1 p. [Link]

Ryberg, Karen R.; Macek-Rowland, Kathleen M.; Banse, Tara A.; Wiche, Gregg J. Edited by Martin, Cathy R., 2007. A History of Flooding in the Red River Basin. Geological Survey (U.S.) General Information Publication 55, Poster: 40 x 30 inches [Link]

Ryberg, Karen R., 2006. Cluster analysis of water-quality data for Lake Sakakawea, Audubon Lake, and McClusky Canal, central North Dakota, 1990-2003. Scientific Investigations Report 2006-5202, 38 p. [Link]

Ryberg, Karen R.; Vecchia, Aldo V., 2006. Water-Quality Trend Analysis and Sampling Design for the Devils Lake Basin, North Dakota, January 1965 Through September 2003. Scientific Investigations Report 2006-5238, v, 64 p. [Link]

Ryberg, Karen R., 2006. Continuous Water-Quality Monitoring and Regression Analysis to Estimate Constituent Concentrations and Loads in the Red River of the North, Fargo, North Dakota, 2003-05. Scientific Investigations Report 2006-5241, v, 35 p. [Link]

Ryberg, Karen R.; Damschen, William C.; Vecchia, Aldo V., 2005. Graphical user interface for accessing water-quality data for the Devils Lake basin, North Dakota. Open-File Report 2005-1419, iii, 15 p. [Link]

Macek-Rowland, Kathleen M.; Arntson, Allan D.; Ryberg, Karen R.; Dahl, Ann L.; Lieb, Amy, 2004. Water-use data for the Red River of the North Basin, North Dakota, Minnesota, and South Dakota, 1979-2001. Open-File Report 2004-1308, 260 p. [Link]






                           

My Science Topics


Science Topic
Subtopic
Environmental Issuesnonpoint-source pollution
Environmental Issuespesticides and herbicides
Environmental Issuessurface water quality
Environmental Issueswater quality
Hydrologic Processeshydrology
Hydrologic Processesstreamflow
Natural Hazardsfloods
Natural Resourceswater resources
Techniques and Methodscomputational methods
Techniques and Methodsstatistical analysis
Water Resourcesfloods
Water Resourcesrunoff
Water Resourcesstreamflow
Water Resourcessurface water
Water Resourcessurface water quality
Water Resourceswater quality
Geographic Analysis and Mappingspatial analysis
Hydrologic Processesrunoff
Information Technologysoftware application development
Information Technologyweb site/page development
Techniques and Methodstree ring analysis



My USGS Science Strategy Areas

A National Hazard, Risk, and Resilience Assessment Program

A Water Census of the United States

Climate Variability & Change

Research Focus

Karen Ryberg is a Statistician spending about half of her time on the National Water Quality Assessment Program's Surface-Water Trends Team, primarily working on trends in pesticide concentrations in surface water.  The other half of her time is spent on a variety of issues including the impact of climate variability and change on streamflow and water quality in the North Central United States, outlier detection in large databases, and statistical support and training.


Selected Recent Presentations

Image of Selected Recent Presentations

Ryberg, K. R., Vecchia, A.V., Akyüz, F.A., and Lin, W., 2015, Tree-ring based estimates of long-term seasonal precipitation in the Souris River Region, of Saskatchewan, North Dakota, and Manitoba,  68th National Canadian Water Resources Association Conference, June 2-4, 2015, Winnipeg, Manitoba, Canada.

Ryberg, K.R., Akyüz, F.A., Wiche, G.J., and Lin, W., 2015, Changes in seasonality and timing of peak streamflow in the north-central United States, 1910-2012, 2015 Western South Dakota Hydrology Meeting, April 15, 2015, Rapid City, S. Dak.

Ryberg, K.R., Vecchia, A.V., Akyüz, F.A., and Lin, W., April 11, 2015, Changes in total phosphorus in the Red River of the North, 1970-2012, 2015 ASABE North Central Intersectional Conference, April 10-11, 2015, Fargo, N. Dak.

Ryberg, K.R., Vecchia, A.V., Akyüz, F.A., and Lin, W., February 10, 2015, Tree-ring based estimates of long-term seasonal precipitation Souris River Region, Saskatchewan, North Dakota, and Manitoba, Water Mission Area Investigations Chiefs Meeting, February 10-12, 2015, Reston, Va.

Ryberg, K.R., June 24, 2014, Climate, Flooding, and the Souris River Basin, International Souris River Board Public Meeting, Minot, N. Dak.

Ryberg, K.R. and Vecchia, A.V., Plenary Speaker, March 5, 2014, Modeling pesticide concentrations in surface water, with special emphasis on results for the corn-belt region of the United States and the Missouri and Red River Basins, 2014 ND Water Quality Monitoring Conference, March 4-6, 2014, Bismarck, N. Dak.

Ryberg, K.R., October 18, 2012, Web site and social media usage during flooding—communicating science, US-Russia Bi-Presidential Commission Science and Technology Working Group Sub-Working Group on Climate Change and the Working Group on Emergency Situations Workshop on Flood Frequency and Flood Inundation Mapping, October 17–19, 2012, Hydrometeorological Center of Russia, Moscow, Russian Federation.

Ryberg, K.R., Lin, W., and Vecchia, A.V., October 15, 2012, Impact of climate variability on runoff in the North Central United States, US-Russia Bi-Presidential Commission Science and Technology Working Group Sub-Working Group on Climate Change and the Working Group on Emergency Situations Workshop on The Impact of Climate Variability on Streamflow in the United States and Russia, October 15–16, 2012, State Hydrologic Institute, St. Petersburg, Russian Federation.


Contact Information

Karen Ryberg
821 E. Interstate Ave
Bismarck, ND 58503
kryberg@usgs.gov
701-250-7422
701-250-7492 - Fax
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