Joshua C Koch, Ph.D.
Surface water / groundwater interactions; hyporheic zone hydrology and biogeochemistry; carbon, nitrogen, and phosphorus cycling; flow above / through frozen ground; preferential flow and soil pipe formation and transport.
Professional Experience
2011 - Present Research Hydrologist, U.S. Geological Survey (USGS), Anchorage, AK
2006 - 2011 Student Hydrologist, Branch of Regional Research, USGS, Boulder, CO
2005 - 2006 Research Assistant, Institute of Alpine and Arctic Research, University of Colorado, Boulder
2003 - 2005 Research Assistant, Semi-Arid Hydrology and Riparian Areas, University of Arizona, Tucson, AZ
2002 - 2003 Hydrologist Intern, Branch of Regional Research, USGS, Lakewood, CO
2001 - 2002 Hydrologist Intern, MA-RI Water District, USGS, Northborough, MA
Education and Certifications
PhD 2010 University of Colorado, Boulder, CO Civil, Environmental, and Architectural Engineering
MS 2005 University of Arizona, Tucson, AZ Department of Hydrology
BA 2001 Wesleyan University, Middletown, CT Earth and Environmental Sciences
Affiliations and Memberships*
American Geophysical Union, Hydrology and Cryosphere Sections
American Water Resources Association - Alaska Chapter
Association of Polar Early Career Scientists
Science and Products
Filter Total Items: 58
Surface water connectivity drives richness and composition of Arctic lake fish assemblages Surface water connectivity drives richness and composition of Arctic lake fish assemblages
Surface water connectivity can influence the richness and composition of fish assemblages, particularly in harsh environments where colonisation factors and access to seasonal refugia are required for species persistence. Studies regarding influence of connectivity on Arctic fish distributions are limited and are rarely applied to whole assemblage patterns. To increase our understanding...
Authors
Sarah Laske, Trevor Haynes, Amanda Rosenberger, Joshua Koch, Mark Wipfli, Matthew Whitman, Christian Zimmerman
Role of ground ice dynamics and ecological feedbacks in recent ice wedge degradation and stabilization Role of ground ice dynamics and ecological feedbacks in recent ice wedge degradation and stabilization
Ground ice is abundant in the upper permafrost throughout the Arctic and fundamentally affects terrain responses to climate warming. Ice wedges, which form near the surface and are the dominant type of massive ice in the Arctic, are particularly vulnerable to warming. Yet processes controlling ice wedge degradation and stabilization are poorly understood. Here we quantified ice wedge...
Authors
Mark Jorgenson, Mikhail Kanevskiy, Yuri Shur, Natalia Moskalenko, Dana Brown, Kimberly Wickland, Robert Striegl, Joshua Koch
Potential for real‐time understanding of coupled hydrologic and biogeochemical processes in stream ecosystems: Future integration of telemetered data with process models for glacial meltwater streams Potential for real‐time understanding of coupled hydrologic and biogeochemical processes in stream ecosystems: Future integration of telemetered data with process models for glacial meltwater streams
While continuous monitoring of streamflow and temperature has been common for some time, there is great potential to expand continuous monitoring to include water quality parameters such as nutrients, turbidity, oxygen, and dissolved organic material. In many systems, distinguishing between watershed and stream ecosystem controls can be challenging. The usefulness of such monitoring can...
Authors
Diane McKnight, Karen Cozzetto, James Cullis, Michael Gooseff, Christopher Jaros, Joshua Koch, W. Lyons, Roseanna Neupauer, Adam Wlostowski
Forecasting wildlife response to rapid warming in the Alaskan Arctic Forecasting wildlife response to rapid warming in the Alaskan Arctic
Arctic wildlife species face a dynamic and increasingly novel environment because of climate warming and the associated increase in human activity. Both marine and terrestrial environments are undergoing rapid environmental shifts, including loss of sea ice, permafrost degradation, and altered biogeochemical fluxes. Forecasting wildlife responses to climate change can facilitate...
Authors
Caroline Van Hemert, Paul Flint, Mark Udevitz, Joshua Koch, Todd Atwood, Karen Oakley, John Pearce
Life in the main channel: long-term hydrologic control of microbial mat abundance in McMurdo Dry Valley streams, Antarctica Life in the main channel: long-term hydrologic control of microbial mat abundance in McMurdo Dry Valley streams, Antarctica
Given alterations in global hydrologic regime, we examine the role of hydrology in regulating stream microbial mat abundance in the McMurdo Dry Valleys, Antarctica. Here, perennial mats persist as a desiccated crust until revived by summer streamflow, which varies inter-annually, and has increased since the 1990s. We predicted high flows to scour mats, and intra-seasonal drying to slow...
Authors
Tyler Kohler, Lee Stanish, Steven Crisp, Joshua Koch, Daniel Liptzin, Jenny Baeseman, Diane McKnight
Morphology-dependent water budgets and nutrient fluxes in arctic thaw ponds Morphology-dependent water budgets and nutrient fluxes in arctic thaw ponds
Thaw ponds on the Arctic Coastal Plain of Alaska are productive ecosystems, providing habitat and food resources for many fish and bird species. Permafrost in this region creates unique pond morphologies: deep troughs, shallow low-centred polygons (LCPs) and larger coalescent ponds. By monitoring seasonal trends in pond volume and chemistry, we evaluated whether pond morphology and size...
Authors
Joshua Koch, Kirsty Gurney, Mark Wipfli
Filter Total Items: 17
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No Result Found
Filter Total Items: 65
No results found.
Science and Products
Filter Total Items: 58
Surface water connectivity drives richness and composition of Arctic lake fish assemblages Surface water connectivity drives richness and composition of Arctic lake fish assemblages
Surface water connectivity can influence the richness and composition of fish assemblages, particularly in harsh environments where colonisation factors and access to seasonal refugia are required for species persistence. Studies regarding influence of connectivity on Arctic fish distributions are limited and are rarely applied to whole assemblage patterns. To increase our understanding...
Authors
Sarah Laske, Trevor Haynes, Amanda Rosenberger, Joshua Koch, Mark Wipfli, Matthew Whitman, Christian Zimmerman
Role of ground ice dynamics and ecological feedbacks in recent ice wedge degradation and stabilization Role of ground ice dynamics and ecological feedbacks in recent ice wedge degradation and stabilization
Ground ice is abundant in the upper permafrost throughout the Arctic and fundamentally affects terrain responses to climate warming. Ice wedges, which form near the surface and are the dominant type of massive ice in the Arctic, are particularly vulnerable to warming. Yet processes controlling ice wedge degradation and stabilization are poorly understood. Here we quantified ice wedge...
Authors
Mark Jorgenson, Mikhail Kanevskiy, Yuri Shur, Natalia Moskalenko, Dana Brown, Kimberly Wickland, Robert Striegl, Joshua Koch
Potential for real‐time understanding of coupled hydrologic and biogeochemical processes in stream ecosystems: Future integration of telemetered data with process models for glacial meltwater streams Potential for real‐time understanding of coupled hydrologic and biogeochemical processes in stream ecosystems: Future integration of telemetered data with process models for glacial meltwater streams
While continuous monitoring of streamflow and temperature has been common for some time, there is great potential to expand continuous monitoring to include water quality parameters such as nutrients, turbidity, oxygen, and dissolved organic material. In many systems, distinguishing between watershed and stream ecosystem controls can be challenging. The usefulness of such monitoring can...
Authors
Diane McKnight, Karen Cozzetto, James Cullis, Michael Gooseff, Christopher Jaros, Joshua Koch, W. Lyons, Roseanna Neupauer, Adam Wlostowski
Forecasting wildlife response to rapid warming in the Alaskan Arctic Forecasting wildlife response to rapid warming in the Alaskan Arctic
Arctic wildlife species face a dynamic and increasingly novel environment because of climate warming and the associated increase in human activity. Both marine and terrestrial environments are undergoing rapid environmental shifts, including loss of sea ice, permafrost degradation, and altered biogeochemical fluxes. Forecasting wildlife responses to climate change can facilitate...
Authors
Caroline Van Hemert, Paul Flint, Mark Udevitz, Joshua Koch, Todd Atwood, Karen Oakley, John Pearce
Life in the main channel: long-term hydrologic control of microbial mat abundance in McMurdo Dry Valley streams, Antarctica Life in the main channel: long-term hydrologic control of microbial mat abundance in McMurdo Dry Valley streams, Antarctica
Given alterations in global hydrologic regime, we examine the role of hydrology in regulating stream microbial mat abundance in the McMurdo Dry Valleys, Antarctica. Here, perennial mats persist as a desiccated crust until revived by summer streamflow, which varies inter-annually, and has increased since the 1990s. We predicted high flows to scour mats, and intra-seasonal drying to slow...
Authors
Tyler Kohler, Lee Stanish, Steven Crisp, Joshua Koch, Daniel Liptzin, Jenny Baeseman, Diane McKnight
Morphology-dependent water budgets and nutrient fluxes in arctic thaw ponds Morphology-dependent water budgets and nutrient fluxes in arctic thaw ponds
Thaw ponds on the Arctic Coastal Plain of Alaska are productive ecosystems, providing habitat and food resources for many fish and bird species. Permafrost in this region creates unique pond morphologies: deep troughs, shallow low-centred polygons (LCPs) and larger coalescent ponds. By monitoring seasonal trends in pond volume and chemistry, we evaluated whether pond morphology and size...
Authors
Joshua Koch, Kirsty Gurney, Mark Wipfli
Filter Total Items: 17
Filter Total Items: 30
No Result Found
Filter Total Items: 65
No results found.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government