Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 134
Controls on ecosystem and root respiration across a permafrost and wetland gradient in interior Alaska
Permafrost is common to many northern wetlands given the insulation of thick organic soil layers, although soil saturation in wetlands can lead to warmer soils and increased thaw depth. We analyzed five years of soil CO2 fluxes along a wetland gradient that varied in permafrost and soil moisture conditions. We predicted that communities with permafrost would have reduced ecosystem respiration (ER)
Authors
Nicole A. McConnell, Merritt R. Turetsky, A. David McGuire, Evan S. Kane, Mark P. Waldrop, Jennifer W. Harden
Characterisation of the Permafrost Carbon Pool
The current estimate of the soil organic carbon (SOC) pool in the northern permafrost region of 1672 Petagrams (Pg) C is much larger than previously reported and needs to be incorporated in global soil carbon (C) inventories. The Northern Circumpolar Soil Carbon Database (NCSCD), extended to include the range 0–300 cm, is now available online for wider use by the scientific community. An important
Authors
P. Kuhry, G. Grosse, J. W. Harden, G. Hugelius, C.D. Koven, C.-L. Ping, L. Schirrmeister, C. Tarnocai
A new data set for estimating organic carbon storage to 3 m depth in soils of the northern circumpolar permafrost region
High-latitude terrestrial ecosystems are key components in the global carbon cycle. The Northern Circumpolar Soil Carbon Database (NCSCD) was developed to quantify stocks of soil organic carbon (SOC) in the northern circumpolar permafrost region (a total area of 18.7 × 106 km2). The NCSCD is a geographical information system (GIS) data set that has been constructed using harmonized regional soil c
Authors
G. Hugelius, James G. Bockheim, P. Camill, B. Elberling, G. Grosse, J. W. Harden, Kevin Johnson, T. Jorgenson, C.D. Koven, P. Kuhry, G. Michaelson, U. Mishra, J. Palmtag, C.-L. Ping, J. O'Donnell, L. Schirrmeister, E.A.G. Schuur, Y. Sheng, L.C. Smith, J. Strauss, Z. Yu
Soil data from fire and permafrost-thaw chronosequences in upland Picea mariana stands near Hess Creek and Tok, interior Alaska
Soils of the Northern Circumpolar Permafrost region harbor 1,672 petagrams (Pg) (1 Pg = 1,000,000,000 kilograms) of organic carbon (OC), nearly 50 percent of the global belowground OC pool (Tarnocai and others, 2009). Of that soil OC, nearly 88 percent is presently stored in perennially frozen ground. Recent climate warming at northern latitudes has resulted in warming and thawing of permafrost in
Authors
Jonathan A. O'Donnell, Jennifer W. Harden, Kristen L. Manies, M. Torre Jorgenson, Mikhail Kanevskiy, Xiaomei Xu
The response of soil organic carbon of a rich fen peatland in interior Alaska to projected climate change
It is important to understand the fate of carbon in boreal peatland soils in response to climate change because a substantial change in release of this carbon as CO2 and CH4 could influence the climate system. The goal of this research was to synthesize the results of a field water table manipulation experiment conducted in a boreal rich fen into a process-based model to understand how soil organi
Authors
Zhaosheng Fan, Anthony David McGuire, Merritt R. Turetsky, Jennifer W. Harden, James Michael Waddington, Evan S. Kane
Response of anaerobic carbon cycling to water table manipulation in an Alaskan rich fen
To test the effects of altered hydrology on organic soil decomposition, we investigated CO2 and CH4 production potential of rich-fen peat (mean surface pH = 6.3) collected from a field water table manipulation experiment including control, raised and lowered water table treatments. Mean anaerobic CO2 production potential at 10 cm depth (14.1 ± 0.9 μmol C g−1 d−1) was as high as aerobic CO2 product
Authors
E.S. Kane, M.R. Chivers, M.R. Turetsky, Claire C. Treat, D.G. Petersen, M. Waldrop, J. W. Harden, A. D. McGuire
Permafrost and organic layer interactions over a climate gradient in a discontinuous permafrost zone
Permafrost is tightly coupled to the organic soil layer, an interaction that mediates permafrost degradation in response to regional warming. We analyzed changes in permafrost occurrence and organic layer thickness (OLT) using more than 3000 soil pedons across a mean annual temperature (MAT) gradient. Cause and effect relationships between permafrost probability (PF), OLT, and other topographic fa
Authors
Kristofer D. Johnson, Jennifer W. Harden, A. David McGuire, Mark Clark, Fengming Yuan, Andrew O. Finley
Empirical estimates to reduce modeling uncertainties of soil organic carbon in permafrost regions: a review of recent progress and remaining challenges
The vast amount of organic carbon (OC) stored in soils of the northern circumpolar permafrost region is a potentially vulnerable component of the global carbon cycle. However, estimates of the quantity, decomposability, and combustibility of OC contained in permafrost-region soils remain highly uncertain, thereby limiting our ability to predict the release of greenhouse gases due to permafrost tha
Authors
U. Mishra, J.D. Jastrow, R. Matamala, G. Hugelius, C.D. Koven, Jennifer W. Harden, S.L. Ping, G.J. Michaelson, Z. Fan, R.M. Miller, A. D. McGuire, C. Tarnocai, P. Kuhry, W.J. Riley, K. Schaefer, E.A.G. Schuur, M.T. Jorgenson, L. D. Hinzman
Assessment of boreal forest historical C dynamics in the Yukon River Basin: relative roles of warming and fire regime change
Carbon (C) dynamics of boreal forest ecosystems have substantial implications for efforts to mitigate the rise of atmospheric CO2 and may be substantially influenced by warming and changing wildfire regimes. In this study we applied a large-scale ecosystem model that included dynamics of organic soil horizons and soil organic matter characteristics of multiple pools to assess forest C stock change
Authors
F.M. Yuan, S.H. Yi, A. D. McGuire, K.D. Johnson, J. Liang, J. W. Harden, E.S. Kasischke, W.A. Kurz
Soil data for a collapse-scar bog chronosequence in Koyukuk Flats National Wildlife Refuge, Alaska, 2008
Peatlands in the northern permafrost region store large amounts of organic carbon, most of which is currently stored in frozen peat deposits. Recent warming at high-latitudes has accelerated permafrost thaw in peatlands, which will likely result in the loss of soil organic carbon from previously frozen peat deposits to the atmosphere. Here, we report soil organic carbon inventories, soil physical
Authors
Jonathan A. O’Donnell, Jennifer W. Harden, Kristen L. Manies, M. Torre Jorgenson
Field information links permafrost carbon to physical vulnerabilities of thawing
Deep soil profiles containing permafrost (Gelisols) were characterized for organic carbon (C) and total nitrogen (N) stocks to 3m depths. Using the Community Climate System Model (CCSM4) we calculate cumulative probability functions (PDFs) for active layer depths under current and future climates. The difference in PDFs over time was multiplied by C and N contents of soil horizons in Gelisol subor
Authors
Jennifer W. Harden, Charles Koven, Chien-Lu Ping, Gustaf Hugelius, A. David McGuire, P. Camill, Torre Jorgenson, Peter Kuhry, Gary Michaelson, Jonathan A. O'Donnell, Edward A.G. Schuur, Charles Tamocai, Kevin Johnson, G. Grosse
Persistence of soil organic matter in eroding versus depositional landform positions
Soil organic matter (SOM) processes in dynamic landscapes are strongly influenced by soil erosion and sedimentation. We determined the contribution of physical isolation of organic matter (OM) inside aggregates, chemical interaction of OM with soil minerals, and molecular structure of SOM in controlling storage and persistence of SOM in different types of eroding and depositional landform position
Authors
Asmeret Asefaw Berhe, Jennifer W. Harden, Margaret S. Torn, Markus Kleber, Sarah D. Burton, John Harte
Science and Products
Filter Total Items: 134
Controls on ecosystem and root respiration across a permafrost and wetland gradient in interior Alaska
Permafrost is common to many northern wetlands given the insulation of thick organic soil layers, although soil saturation in wetlands can lead to warmer soils and increased thaw depth. We analyzed five years of soil CO2 fluxes along a wetland gradient that varied in permafrost and soil moisture conditions. We predicted that communities with permafrost would have reduced ecosystem respiration (ER)
Authors
Nicole A. McConnell, Merritt R. Turetsky, A. David McGuire, Evan S. Kane, Mark P. Waldrop, Jennifer W. Harden
Characterisation of the Permafrost Carbon Pool
The current estimate of the soil organic carbon (SOC) pool in the northern permafrost region of 1672 Petagrams (Pg) C is much larger than previously reported and needs to be incorporated in global soil carbon (C) inventories. The Northern Circumpolar Soil Carbon Database (NCSCD), extended to include the range 0–300 cm, is now available online for wider use by the scientific community. An important
Authors
P. Kuhry, G. Grosse, J. W. Harden, G. Hugelius, C.D. Koven, C.-L. Ping, L. Schirrmeister, C. Tarnocai
A new data set for estimating organic carbon storage to 3 m depth in soils of the northern circumpolar permafrost region
High-latitude terrestrial ecosystems are key components in the global carbon cycle. The Northern Circumpolar Soil Carbon Database (NCSCD) was developed to quantify stocks of soil organic carbon (SOC) in the northern circumpolar permafrost region (a total area of 18.7 × 106 km2). The NCSCD is a geographical information system (GIS) data set that has been constructed using harmonized regional soil c
Authors
G. Hugelius, James G. Bockheim, P. Camill, B. Elberling, G. Grosse, J. W. Harden, Kevin Johnson, T. Jorgenson, C.D. Koven, P. Kuhry, G. Michaelson, U. Mishra, J. Palmtag, C.-L. Ping, J. O'Donnell, L. Schirrmeister, E.A.G. Schuur, Y. Sheng, L.C. Smith, J. Strauss, Z. Yu
Soil data from fire and permafrost-thaw chronosequences in upland Picea mariana stands near Hess Creek and Tok, interior Alaska
Soils of the Northern Circumpolar Permafrost region harbor 1,672 petagrams (Pg) (1 Pg = 1,000,000,000 kilograms) of organic carbon (OC), nearly 50 percent of the global belowground OC pool (Tarnocai and others, 2009). Of that soil OC, nearly 88 percent is presently stored in perennially frozen ground. Recent climate warming at northern latitudes has resulted in warming and thawing of permafrost in
Authors
Jonathan A. O'Donnell, Jennifer W. Harden, Kristen L. Manies, M. Torre Jorgenson, Mikhail Kanevskiy, Xiaomei Xu
The response of soil organic carbon of a rich fen peatland in interior Alaska to projected climate change
It is important to understand the fate of carbon in boreal peatland soils in response to climate change because a substantial change in release of this carbon as CO2 and CH4 could influence the climate system. The goal of this research was to synthesize the results of a field water table manipulation experiment conducted in a boreal rich fen into a process-based model to understand how soil organi
Authors
Zhaosheng Fan, Anthony David McGuire, Merritt R. Turetsky, Jennifer W. Harden, James Michael Waddington, Evan S. Kane
Response of anaerobic carbon cycling to water table manipulation in an Alaskan rich fen
To test the effects of altered hydrology on organic soil decomposition, we investigated CO2 and CH4 production potential of rich-fen peat (mean surface pH = 6.3) collected from a field water table manipulation experiment including control, raised and lowered water table treatments. Mean anaerobic CO2 production potential at 10 cm depth (14.1 ± 0.9 μmol C g−1 d−1) was as high as aerobic CO2 product
Authors
E.S. Kane, M.R. Chivers, M.R. Turetsky, Claire C. Treat, D.G. Petersen, M. Waldrop, J. W. Harden, A. D. McGuire
Permafrost and organic layer interactions over a climate gradient in a discontinuous permafrost zone
Permafrost is tightly coupled to the organic soil layer, an interaction that mediates permafrost degradation in response to regional warming. We analyzed changes in permafrost occurrence and organic layer thickness (OLT) using more than 3000 soil pedons across a mean annual temperature (MAT) gradient. Cause and effect relationships between permafrost probability (PF), OLT, and other topographic fa
Authors
Kristofer D. Johnson, Jennifer W. Harden, A. David McGuire, Mark Clark, Fengming Yuan, Andrew O. Finley
Empirical estimates to reduce modeling uncertainties of soil organic carbon in permafrost regions: a review of recent progress and remaining challenges
The vast amount of organic carbon (OC) stored in soils of the northern circumpolar permafrost region is a potentially vulnerable component of the global carbon cycle. However, estimates of the quantity, decomposability, and combustibility of OC contained in permafrost-region soils remain highly uncertain, thereby limiting our ability to predict the release of greenhouse gases due to permafrost tha
Authors
U. Mishra, J.D. Jastrow, R. Matamala, G. Hugelius, C.D. Koven, Jennifer W. Harden, S.L. Ping, G.J. Michaelson, Z. Fan, R.M. Miller, A. D. McGuire, C. Tarnocai, P. Kuhry, W.J. Riley, K. Schaefer, E.A.G. Schuur, M.T. Jorgenson, L. D. Hinzman
Assessment of boreal forest historical C dynamics in the Yukon River Basin: relative roles of warming and fire regime change
Carbon (C) dynamics of boreal forest ecosystems have substantial implications for efforts to mitigate the rise of atmospheric CO2 and may be substantially influenced by warming and changing wildfire regimes. In this study we applied a large-scale ecosystem model that included dynamics of organic soil horizons and soil organic matter characteristics of multiple pools to assess forest C stock change
Authors
F.M. Yuan, S.H. Yi, A. D. McGuire, K.D. Johnson, J. Liang, J. W. Harden, E.S. Kasischke, W.A. Kurz
Soil data for a collapse-scar bog chronosequence in Koyukuk Flats National Wildlife Refuge, Alaska, 2008
Peatlands in the northern permafrost region store large amounts of organic carbon, most of which is currently stored in frozen peat deposits. Recent warming at high-latitudes has accelerated permafrost thaw in peatlands, which will likely result in the loss of soil organic carbon from previously frozen peat deposits to the atmosphere. Here, we report soil organic carbon inventories, soil physical
Authors
Jonathan A. O’Donnell, Jennifer W. Harden, Kristen L. Manies, M. Torre Jorgenson
Field information links permafrost carbon to physical vulnerabilities of thawing
Deep soil profiles containing permafrost (Gelisols) were characterized for organic carbon (C) and total nitrogen (N) stocks to 3m depths. Using the Community Climate System Model (CCSM4) we calculate cumulative probability functions (PDFs) for active layer depths under current and future climates. The difference in PDFs over time was multiplied by C and N contents of soil horizons in Gelisol subor
Authors
Jennifer W. Harden, Charles Koven, Chien-Lu Ping, Gustaf Hugelius, A. David McGuire, P. Camill, Torre Jorgenson, Peter Kuhry, Gary Michaelson, Jonathan A. O'Donnell, Edward A.G. Schuur, Charles Tamocai, Kevin Johnson, G. Grosse
Persistence of soil organic matter in eroding versus depositional landform positions
Soil organic matter (SOM) processes in dynamic landscapes are strongly influenced by soil erosion and sedimentation. We determined the contribution of physical isolation of organic matter (OM) inside aggregates, chemical interaction of OM with soil minerals, and molecular structure of SOM in controlling storage and persistence of SOM in different types of eroding and depositional landform position
Authors
Asmeret Asefaw Berhe, Jennifer W. Harden, Margaret S. Torn, Markus Kleber, Sarah D. Burton, John Harte
*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