As permafrost soils in the Arctic warm and thaw, greenhouse gases including methane are released into the atmosphere. USGS Ecologist Kristen Manies of the USGS Geology, Minerals, Energy, and Geophysics Science Center (GMEGSC) is researching low-cost ways to measure methane emissions across these changing ecosystems.
Kristen Manies
Kristen is an Ecologist with Geology, Minerals, Energy, and Geophysics Science Center in Menlo Park, CA. She studies how disturbances affect the carbon cycle, with the majority of her research focusing on the boreal region of Alaska and Canada.
Kristen's research explores how disturbance affects the global carbon cycle. Carbon enters soil from dead plant material and exits the soil through decomposition and root respiration. The amount of carbon stored in soil is the sum of these inputs minus the sum of loses. Understanding what controls this balance is important because 1) there is nearly three times the amount of carbon in soils than in the atmosphere, so changes in soil carbon storage can have large impacts on the amount of atmospheric carbon, and 2) soil carbon is tied to soil health.
For most of her career Kristen has been focused on the carbon cycle of the boreal region of Interior Alaska and Canada. Boreal soils are known carbon sinks, meaning that more carbon enters than leaves the soil. However, boreal regions are experiencing a great deal of warming due to climate change. This warming is causing more and higher intensity fires. It is also thawing the permafrost, or frozen soil, that underlies much of the boreal region. These disturbances have the potential to impact not just the amount of carbon entering and leaving the soil, but also the way carbon moves through these ecosystems and rates of this movement. Kristen's research looks for these changes.
Non-USGS Partners:
- NASA-Ames
- NASA-JPL
- University of Alaska
- Fairbanks
- Bonanza Creek LTER
Education and Certifications
University of Wisconsin, Madison, Forest Ecology, M.S. 1997
University of California, Santa Barbara, Environmental Studies, B.S. 1991
Affiliations and Memberships*
American Geophysical Union
Permafrost Carbon Network,
International Soil Carbon Network
Science and Products
Response of plant, microbial, and soil functions to drought and fire in California
Arctic Biogeochemical Response to Permafrost Thaw (ABRUPT)
Plant, soil, and microbial characteristics of marsh collapse in Mississippi River Deltaic wetlands
Depth to frozen soil measurements at APEX, 2008-2023
Depth to frozen soil measurements taken by a variety of collaborators at the Alaskan Peatland EXeriment (APEX) bog/permafrost plateau site. Data is from 2018 - 2023.
Soil data and age models used to investigate the effects of permafrost thaw on carbon storage, Interior Alaska
Permafrost characterization at the Alaska Peatland Experiment (APEX) site: Geophysical and related field data collected from 2018-2020
As permafrost soils in the Arctic warm and thaw, greenhouse gases including methane are released into the atmosphere. USGS Ecologist Kristen Manies of the USGS Geology, Minerals, Energy, and Geophysics Science Center (GMEGSC) is researching low-cost ways to measure methane emissions across these changing ecosystems.
Collaborators Kristen Manies (Geology, Minerals, Energy, and Geophysics Science Center), Joe Adams (National Uncrewed Systems Office, NUSO), Victoria Scholl (NUSO), Brian Gullett U.S.
Collaborators Kristen Manies (Geology, Minerals, Energy, and Geophysics Science Center), Joe Adams (National Uncrewed Systems Office, NUSO), Victoria Scholl (NUSO), Brian Gullett U.S.
Permafrost is ground that has been frozen for at least two years. With the warming climate, permafrost across Alaska is thawing and greenhouse gases such as methane are released as a result. Ecologist Kristen Manies of the U.S.
Permafrost is ground that has been frozen for at least two years. With the warming climate, permafrost across Alaska is thawing and greenhouse gases such as methane are released as a result. Ecologist Kristen Manies of the U.S.
A scientist conducts winter instrument maintenance in interior Alaska surrounded by snow covered forest.
A scientist conducts winter instrument maintenance in interior Alaska surrounded by snow covered forest.
Looking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Looking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Scientific crew and drone operators. Left to right: Richard Kolyer (NASA), Jack McFarland (USGS), Kristen Manies (USGS), and Jonas Jonsson (NASA)
Scientific crew and drone operators. Left to right: Richard Kolyer (NASA), Jack McFarland (USGS), Kristen Manies (USGS), and Jonas Jonsson (NASA)
Looking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Looking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Stark comparison between bog (no permafrost) in the foreground and a boreal forest (with permafrost) in the background in the Alaskan interior.
Stark comparison between bog (no permafrost) in the foreground and a boreal forest (with permafrost) in the background in the Alaskan interior.
Vegetation loss following vertical drowning of Mississippi River deltaic wetlands leads to faster microbial decomposition and decreases in soil carbon
Medium-fidelity CFD modeling of multicopter wakes for airborne sensor measurements
Biofilms in the Critical Zone: Distribution and mediation of processes
The Boreal-Arctic Wetland and Lake Dataset (BAWLD)
Influence of permafrost type and site history on losses of permafrost carbon after thaw
Carbon fluxes and microbial activities from boreal peatlands experiencing permafrost thaw
USGS permafrost research determines the risks of permafrost thaw to biologic and hydrologic resources
Generalized models to estimate carbon and nitrogen stocks of organic soil horizons in Interior Alaska
Rapid carbon loss and slow recovery following permafrost thaw in boreal peatlands
Soil data for a thermokarst bog and the surrounding permafrost plateau forest, located at Bonanza Creek Long Term Ecological Research Site, Interior Alaska
Decadal and long-term boreal soil carbon and nitrogen sequestration rates across a variety of ecosystems
Soil data for a vegetation gradient located at Bonanza Creek Long Term Ecological Research Site, interior Alaska
Science and Products
- Science
Response of plant, microbial, and soil functions to drought and fire in California
California is experiencing changes in precipitation and wildfire regimes. Longer, hotter fire seasons along with extremes in precipitation are expected to continue. Not only do these disturbances affect the productivity and resilience of ecosystems, they also directly impact human health and wellbeing. Soils hold an immense amount of our terrestrial carbon pool, and the microorganisms and minerals...Arctic Biogeochemical Response to Permafrost Thaw (ABRUPT)
Warming and thawing of permafrost soils in the Arctic is expected to become widespread over the coming decades. Permafrost thaw changes ecosystem structure and function, affects resource availability for wildlife and society, and decreases ground stability which affects human infrastructure. Since permafrost soils contain about half of the global soil carbon (C) pool, the magnitude of C losses... - Data
Plant, soil, and microbial characteristics of marsh collapse in Mississippi River Deltaic wetlands
Site, field, and soil data collected from 14 sites along a chronosequence of wetland submergence on 15 – 17 October 2019 in a Louisiana salt marsh in Barataria Basin, part of the Mississippi River Deltaic Plain, along the northern Gulf of Mexico coast.Depth to frozen soil measurements at APEX, 2008-2023
Depth to frozen soil measurements taken by a variety of collaborators at the Alaskan Peatland EXeriment (APEX) bog/permafrost plateau site. Data is from 2018 - 2023.
Soil data and age models used to investigate the effects of permafrost thaw on carbon storage, Interior Alaska
We quantified permafrost plateau carbon (C) and post-thaw C stocks across a peatland permafrost thaw chronosequence in Interior Alaska to evaluate whether C losses occurred with thaw . Peat core macrofossil reconstructions revealed three stratigraphic layers of peat: (1) a base layer of fen/marsh peat, (2) forested permafrost plateau peat and, (3) where permafrost thaw has occurred, collapse-scarPermafrost characterization at the Alaska Peatland Experiment (APEX) site: Geophysical and related field data collected from 2018-2020
Geophysical measurements and related field data were collected by the U.S. Geological Survey (USGS) at the Alaska Peatland Experiment (APEX) site in Interior Alaska from 2018 to 2020 to characterize subsurface thermal and hydrologic conditions along a permafrost thaw gradient. The APEX site is managed by the Bonanza Creek LTER (Long Term Ecological Research). In April 2018, seven boreholes were em - Multimedia
USGS using drones to measure methane escaping Arctic permafrost - Aug 2023USGS using drones to measure methane escaping Arctic permafrost - Aug 2023USGS using drones to measure methane escaping Arctic permafrost - Aug 2023
As permafrost soils in the Arctic warm and thaw, greenhouse gases including methane are released into the atmosphere. USGS Ecologist Kristen Manies of the USGS Geology, Minerals, Energy, and Geophysics Science Center (GMEGSC) is researching low-cost ways to measure methane emissions across these changing ecosystems.
As permafrost soils in the Arctic warm and thaw, greenhouse gases including methane are released into the atmosphere. USGS Ecologist Kristen Manies of the USGS Geology, Minerals, Energy, and Geophysics Science Center (GMEGSC) is researching low-cost ways to measure methane emissions across these changing ecosystems.
Field crew sit on boardwalk while collecting UAS methane measurements in Alaska 2023Field crew sit on boardwalk while collecting UAS methane measurements in Alaska 2023Collaborators Kristen Manies (Geology, Minerals, Energy, and Geophysics Science Center), Joe Adams (National Uncrewed Systems Office, NUSO), Victoria Scholl (NUSO), Brian Gullett U.S.
Collaborators Kristen Manies (Geology, Minerals, Energy, and Geophysics Science Center), Joe Adams (National Uncrewed Systems Office, NUSO), Victoria Scholl (NUSO), Brian Gullett U.S.
Measuring natural methane emissions from bogs using drones in Alaska B-RollMeasuring natural methane emissions from bogs using drones in Alaska B-RollMeasuring natural methane emissions from bogs using drones in Alaska B-RollPermafrost is ground that has been frozen for at least two years. With the warming climate, permafrost across Alaska is thawing and greenhouse gases such as methane are released as a result. Ecologist Kristen Manies of the U.S.
Permafrost is ground that has been frozen for at least two years. With the warming climate, permafrost across Alaska is thawing and greenhouse gases such as methane are released as a result. Ecologist Kristen Manies of the U.S.
Winter Instrument Maintenance in AlaskaA scientist conducts winter instrument maintenance in interior Alaska surrounded by snow covered forest.
A scientist conducts winter instrument maintenance in interior Alaska surrounded by snow covered forest.
UAS over flux towerLooking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Looking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Scientific crew and drone operatorsScientific crew and drone operators. Left to right: Richard Kolyer (NASA), Jack McFarland (USGS), Kristen Manies (USGS), and Jonas Jonsson (NASA)
Scientific crew and drone operators. Left to right: Richard Kolyer (NASA), Jack McFarland (USGS), Kristen Manies (USGS), and Jonas Jonsson (NASA)
Methane drone hovering above permafrostLooking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Looking up at a drone hovering near an open-path methane analyzer mounted on a flux tower. Instruments mounted on both the towers and on the drones are measuring gases emitted from the soil.
Bog and boreal forest in AlaskaStark comparison between bog (no permafrost) in the foreground and a boreal forest (with permafrost) in the background in the Alaskan interior.
Stark comparison between bog (no permafrost) in the foreground and a boreal forest (with permafrost) in the background in the Alaskan interior.
- Publications
Filter Total Items: 24
Vegetation loss following vertical drowning of Mississippi River deltaic wetlands leads to faster microbial decomposition and decreases in soil carbon
Wetland ecosystems hold nearly a third of the global soil carbon pool, but as wetlands rapidly disappear the fate of this stored soil carbon is unclear. The aim of this study was to quantify and then link potential rates of microbial decomposition after vertical drowning of vegetated tidal marshes in coastal Louisiana to known drivers of anaerobic decomposition altered by vegetation loss. ProfilesAuthorsCourtney Creamer, Mark Waldrop, Camille Stagg, Kristen L. Manies, Melissa Millman Baustian, Claudia Laurenzano, Tiong Gim Aw, Monica Haw, Sergio Merino, Donald R. Schoolmaster, Sabrina N. Sevilgen, Rachel Katherine Villani, Eric WardMedium-fidelity CFD modeling of multicopter wakes for airborne sensor measurements
No abstract available.AuthorsJonathan Chiew, Michael Aftosmis, Kristen L. ManiesBiofilms in the Critical Zone: Distribution and mediation of processes
Microbial biofilms occur in all levels of the Critical Zone (CZ); they are on and in the vegetation, throughout the soil-saprolite zone, and along fractures in deep subsurface. Here we discuss biofilms in each level of the CZ with a focus in the soil-saprolite continuum. We show how scanning electron microscope (SEM) images provide an appropriate scale to explore microbe mineral interactions in thAuthorsMarjorie S. Schulz, Kristen L. ManiesThe Boreal-Arctic Wetland and Lake Dataset (BAWLD)
Methane emissions from boreal and arctic wetlands, lakes, and rivers are expected to increase in response to warming and associated permafrost thaw. However, the lack of appropriate land cover datasets for scaling field-measured methane emissions to circumpolar scales has contributed to a large uncertainty for our understanding of present-day and future methane emissions. Here we present the BoreaAuthorsDavid Olefeldt, Mikael Hovemyr, M.A. Kuhn, D Bastviken, T.J. Bohn, J. Connolly, P.M. Crill, E.S. Euskirchen, S.A. Finkelstein, H. Genet, G. Grosse, L.I. Harris, L. Heffernan, M. Helbig, G. Hugelium, R. Hutchins, S. Juutinen, M.J. Lara, A. Malhotra, Kristen L. Manies, A.D. McGuire, S.M. Natali, J. A. O'Donnell, F-J.W. Parmentier, A. Rasanen, C. Schaedel, O. Sonnentag, M. Strack, S.E. Tank, C. C. Treat, R.K. Varner, T. Virtanen, J.D. Watts, R.K. WarrenInfluence of permafrost type and site history on losses of permafrost carbon after thaw
We quantified permafrost peat plateau and post-thaw carbon (C) stocks across a chronosequence in Interior Alaska to evaluate the amount of C lost with thaw. Macrofossil reconstructions revealed three stratigraphic layers of peat: (1) a base layer of fen/marsh peat, (2) peat from a forested peat plateau (with permafrost) and, (3) collapse-scar bog peat (at sites where permafrost thaw has occurred).AuthorsKristen L. Manies, Miriam C. Jones, Mark Waldrop, Mary-Catherine Leewis, Christopher C. Fuller, Robert S. Cornman, Kristen HoefkeCarbon fluxes and microbial activities from boreal peatlands experiencing permafrost thaw
Permafrost thaw in northern ecosystems may cause large quantities of carbon (C) to move from soil to atmospheric pools. Because soil microbial communities play a critical role in regulating C fluxes from soils, we examined microbial activity and greenhouse gas production soon after permafrost thaw and ground collapse (into collapse-scar bogs), relative to the permafrost plateau or older thaw featuAuthorsMark Waldrop, Jack McFarland, Kristen L. Manies, Mary-Cathrine Leewis, Steve Blazewicz, Miriam C. Jones, Rebecca Neumann, Jason Keller, Rachel Cohen, Eugenie S. Euskirchen, Colin W. Edgar, Merritt R. Turetsky, William CableUSGS permafrost research determines the risks of permafrost thaw to biologic and hydrologic resources
The U.S. Geological Survey (USGS), in collaboration with university, Federal, Tribal, and independent partners, conducts fundamental research on the distribution, vulnerability, and importance of permafrost in arctic and boreal ecosystems. Scientists, land managers, and policy makers use USGS data to help make decisions for development, wildlife habitat, and other needs. Native villages and citiesAuthorsMark P. Waldrop, Lesleigh Anderson, Mark Dornblaser, Li H. Erikson, Ann E. Gibbs, Nicole M. Herman-Mercer, Stephanie R. James, Miriam C. Jones, Joshua C. Koch, Mary-Cathrine Leewis, Kristen L. Manies, Burke J. Minsley, Neal J. Pastick, Vijay Patil, Frank Urban, Michelle A. Walvoord, Kimberly P. Wickland, Christian ZimmermanByNatural Hazards Mission Area, Water Resources Mission Area, Climate Research and Development Program, Coastal and Marine Hazards and Resources Program, Land Change Science Program, Volcano Hazards Program, Earth Resources Observation and Science (EROS) Center , Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Pacific Coastal and Marine Science Center, Volcano Science CenterGeneralized models to estimate carbon and nitrogen stocks of organic soil horizons in Interior Alaska
Boreal ecosystems comprise one tenth of the world’s land surface and contain over 20 % of the global soil carbon (C) stocks. Boreal soils are unique in that its mineral soil is covered by what can be quite thick layers of organic soil. These organic soil layers, or horizons, can differ in their state of decomposition, source vegetation, and disturbance history. These differences result in varyingAuthorsKristen L. Manies, Mark Waldrop, Jennifer W. HardenRapid carbon loss and slow recovery following permafrost thaw in boreal peatlands
Permafrost peatlands store one-third of the total carbon (C) in the atmosphere and are increasingly vulnerable to thaw as high-latitude temperatures warm. Large uncertainties remain about C dynamics following permafrost thaw in boreal peatlands. We used a chronosequence approach to measure C stocks in forested permafrost plateaus (forest) and thawed permafrost bogs, ranging in thaw age from youngAuthorsMiriam C. Jones, Jennifer W. Harden, Jonathan A. O'Donnell, Kristen L. Manies, Torre Jorgenson, Claire C. Treat, Stephanie EwingSoil data for a thermokarst bog and the surrounding permafrost plateau forest, located at Bonanza Creek Long Term Ecological Research Site, Interior Alaska
Peatlands play an important role in boreal ecosystems, storing a large amount of soil organic carbon. In northern ecosystems, collapse-scar bogs (also known as thermokarst bogs) often form as the result of ground subsidence following permafrost thaw. To examine how ecosystem carbon balance changes with the loss of permafrost, we measured carbon and nitrogen storage within a thermokarst bog and theAuthorsKristen L. Manies, Christopher C. Fuller, Miriam C. Jones, Mark P. Waldrop, John P. McGeehinDecadal and long-term boreal soil carbon and nitrogen sequestration rates across a variety of ecosystems
Boreal soils play a critical role in the global carbon (C) cycle; therefore, it is important to understand the mechanisms that control soil C accumulation and loss for this region. Examining C & nitrogen (N) accumulation rates over decades to centuries may provide additional understanding of the dominant mechanisms for their storage, which can be masked by seasonal and interannual variability whenAuthorsKristen L. Manies, Jennifer W. Harden, Christopher C. Fuller, Merritt TuretskySoil data for a vegetation gradient located at Bonanza Creek Long Term Ecological Research Site, interior Alaska
Boreal soils play an important role in the global carbon cycle owing to the large amount of carbon stored within this northern region. To understand how carbon and nitrogen storage varied among different ecosystems, a vegetation gradient was established in the Bonanza Creek Long Term Ecological Research (LTER) site, located in interior Alaska. The ecosystems represented are a black spruce (Picea mAuthorsKristen L. Manies, Jennifer W. Harden, Christopher C. Fuller, Xiaomei Xu, John P. McGeehin - News
*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