Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 144
Recent acceleration of biomass burning and carbon losses in Alaskan forests and peatlands Recent acceleration of biomass burning and carbon losses in Alaskan forests and peatlands
Climate change has increased the area affected by forest fires each year in boreal North America. Increases in burned area and fire frequency are expected to stimulate boreal carbon losses. However, the impact of wildfires on carbon emissions is also affected by the severity of burning. How climate change influences the severity of biomass burning has proved difficult to assess. Here, we...
Authors
M.R. Turetsky, E.S. Kane, J.W. Harden, R.D. Ottmar, K.L. Manies, E. Hoy, E.S. Kasischke
Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen
[1] Boreal wetland carbon cycling is vulnerable to climate change in part because hydrology and the extent of frozen ground have strong influences on plant and microbial functions. We examined the response of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) across an experimental manipulation of water table position (both raised and lowered water table treatments) in a...
Authors
Evan S. Kane, Merritt R. Turetsky, Jennifer W. Harden, A. David McGuire, James Michael Waddington
The carbon budget of the northern cryosphere region The carbon budget of the northern cryosphere region
The northern cryosphere is undergoing substantial warming of permafrost and loss of sea ice. Release of stored carbon to the atmosphere in response to this change has the potential to affect the global climate system. Studies indicate that the northern cryosphere has been not only a substantial sink for atmospheric CO2 in recent decades, but also an important source of CH4 because of...
Authors
A. David McGuire, Robie W. Macdonald, Edward A.G. Schuur, Jennifer W. Harden, Peter Kuhry, Daniel J. Hayes, Torben R. Christensen, Martin Heimann
The role of mosses in ecosystem succession and function in Alaska’s boreal forest The role of mosses in ecosystem succession and function in Alaska’s boreal forest
Shifts in moss communities may affect the resilience of boreal ecosystems to a changing climate because of the role of moss species in regulating soil climate and biogeochemical cycling. Here, we use long-term data analysis and literature synthesis to examine the role of moss in ecosystem succession, productivity, and decomposition. In Alaskan forests, moss abundance showed a unimodal...
Authors
Merritt R. Turetsky, Michelle Mack, Teresa N. Hollingsworth, Jennifer W. Harden
Resilience and vulnerability of permafrost to climate change Resilience and vulnerability of permafrost to climate change
The resilience and vulnerability of permafrost to climate change depends on complex interactions among topography, water, soil, vegetation, and snow, which allow permafrost to persist at mean annual air temperatures (MAATs) as high as +2 °C and degrade at MAATs as low as –20 °C. To assess these interactions, we compiled existing data and tested effects of varying conditions on mean...
Authors
M.Torre Jorgenson, Vladimir Romanovsky, Jennifer W. Harden, Yuri Shur, Jonathan O'Donnell, Edward A.G. Schuur, Mikhail Kanevskiy, Sergei Marchenko
Molecular investigations into a globally important carbon pool: Permafrost-protected carbon in Alaskan soils Molecular investigations into a globally important carbon pool: Permafrost-protected carbon in Alaskan soils
The fate of carbon (C) contained within permafrost in boreal forest environments is an important consideration for the current and future carbon cycle as soils warm in northern latitudes. Currently, little is known about the microbiology or chemistry of permafrost soils that may affect its decomposition once soils thaw. We tested the hypothesis that low microbial abundances and...
Authors
M. P. Waldrop, K.P. Wickland, Rickie White, A.A. Berhe, J.W. Harden, V.E. Romanovsky
Science and Products
Filter Total Items: 144
Recent acceleration of biomass burning and carbon losses in Alaskan forests and peatlands Recent acceleration of biomass burning and carbon losses in Alaskan forests and peatlands
Climate change has increased the area affected by forest fires each year in boreal North America. Increases in burned area and fire frequency are expected to stimulate boreal carbon losses. However, the impact of wildfires on carbon emissions is also affected by the severity of burning. How climate change influences the severity of biomass burning has proved difficult to assess. Here, we...
Authors
M.R. Turetsky, E.S. Kane, J.W. Harden, R.D. Ottmar, K.L. Manies, E. Hoy, E.S. Kasischke
Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen
[1] Boreal wetland carbon cycling is vulnerable to climate change in part because hydrology and the extent of frozen ground have strong influences on plant and microbial functions. We examined the response of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) across an experimental manipulation of water table position (both raised and lowered water table treatments) in a...
Authors
Evan S. Kane, Merritt R. Turetsky, Jennifer W. Harden, A. David McGuire, James Michael Waddington
The carbon budget of the northern cryosphere region The carbon budget of the northern cryosphere region
The northern cryosphere is undergoing substantial warming of permafrost and loss of sea ice. Release of stored carbon to the atmosphere in response to this change has the potential to affect the global climate system. Studies indicate that the northern cryosphere has been not only a substantial sink for atmospheric CO2 in recent decades, but also an important source of CH4 because of...
Authors
A. David McGuire, Robie W. Macdonald, Edward A.G. Schuur, Jennifer W. Harden, Peter Kuhry, Daniel J. Hayes, Torben R. Christensen, Martin Heimann
The role of mosses in ecosystem succession and function in Alaska’s boreal forest The role of mosses in ecosystem succession and function in Alaska’s boreal forest
Shifts in moss communities may affect the resilience of boreal ecosystems to a changing climate because of the role of moss species in regulating soil climate and biogeochemical cycling. Here, we use long-term data analysis and literature synthesis to examine the role of moss in ecosystem succession, productivity, and decomposition. In Alaskan forests, moss abundance showed a unimodal...
Authors
Merritt R. Turetsky, Michelle Mack, Teresa N. Hollingsworth, Jennifer W. Harden
Resilience and vulnerability of permafrost to climate change Resilience and vulnerability of permafrost to climate change
The resilience and vulnerability of permafrost to climate change depends on complex interactions among topography, water, soil, vegetation, and snow, which allow permafrost to persist at mean annual air temperatures (MAATs) as high as +2 °C and degrade at MAATs as low as –20 °C. To assess these interactions, we compiled existing data and tested effects of varying conditions on mean...
Authors
M.Torre Jorgenson, Vladimir Romanovsky, Jennifer W. Harden, Yuri Shur, Jonathan O'Donnell, Edward A.G. Schuur, Mikhail Kanevskiy, Sergei Marchenko
Molecular investigations into a globally important carbon pool: Permafrost-protected carbon in Alaskan soils Molecular investigations into a globally important carbon pool: Permafrost-protected carbon in Alaskan soils
The fate of carbon (C) contained within permafrost in boreal forest environments is an important consideration for the current and future carbon cycle as soils warm in northern latitudes. Currently, little is known about the microbiology or chemistry of permafrost soils that may affect its decomposition once soils thaw. We tested the hypothesis that low microbial abundances and...
Authors
M. P. Waldrop, K.P. Wickland, Rickie White, A.A. Berhe, J.W. Harden, V.E. Romanovsky
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