Kevin D Kroeger, PhD (Former Employee)
Science and Products
Filter Total Items: 23
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Filter Total Items: 68
Tidal wetland gross primary production across the continental United States, 2000–2019
We mapped tidal wetland gross primary production (GPP) with unprecedented detail for multiple wetland types across the continental United States (CONUS) at 16‐day intervals for the years 2000–2019. To accomplish this task, we developed the spatially explicit Blue Carbon (BC) model, which combined tidal wetland cover and field‐based eddy covariance tower data into a single Bayesian...
Authors
R.A. Feagin, Inke Forbrich, T. P. Huff, J.G. Barr, J. Ruiz-Plancarte, J.D. Fuentes, Raymond G. Najjar, R. Vargas, A. Vazquez Lule, Lisamarie Windham-Myers, Kevin Kroeger, E. J. Ward, G.W. Moore, M. Leclerc, Ken W. Krauss, Camille L. Stagg, Merryl Alber, S. H. Knox, K. V. R. Schafer, T.S. Bianchi, Jack Hutchings, H. Nahrawi, A. Noormets, B. Mitra, Aline Jaimes, A.L. Hinson, Brian Bergamaschi, J.S. King, G. Miao
Phytoplankton community structure response to groundwater-borne nutrients in the inland bays, Delaware
To determine the impacts of groundwater-borne nutrients on phytoplankton biomass and community structure, we conducted a series of mesocosm experiments in the Inland Bays of Delaware. Four treatments were tested, including mesocosms coupled directly to submarine groundwater seepage, mesocosms with the addition of pumped submarine groundwater, mesocosms with the addition of phosphate, and...
Authors
Daniel Torre, Kathryn Coyne, Kevin Kroeger, Joanna K. York
Water salinity and inundation control soil carbon decomposition during salt marsh restoration: An incubation experiment
Coastal wetlands are a significant carbon (C) sink since they store carbon in anoxic soils. This ecosystem service is impacted by hydrologic alteration and management of these coastal habitats. Efforts to restore tidal flow to former salt marshes have increased in recent decades and are generally associated with alteration of water inundation levels and salinity. This study examined the...
Authors
Faming Wang, Kevin Kroeger, Meagan J. Eagle, John W. Pohlman, Jianwu Tang
Salt marsh ecosystem restructuring enhances elevation resilience and carbon storage during accelerating relative sea-level rise
Salt marshes respond to sea-level rise through a series of complex and dynamic bio-physical feedbacks. In this study, we found that sea-level rise triggered salt marsh habitat restructuring, with the associated vegetation changes enhancing salt marsh elevation resilience. A continuous record of marsh elevation relative to sea level that includes reconstruction of high-resolution, sub...
Authors
Meagan J. Eagle, Christopher V. Maio, Kevin Kroeger, Andrea D. Hawkes, Jordan Mora, Richard Sullivan, Stephanie Madsen, Richard Michael Buzard, Niamh Cahill, Jeffrey P. Donnelly
Uncertainty in United States coastal wetland greenhouse gas inventorying
Coastal wetlands store carbon dioxide (CO2) and emit CO2 and methane (CH4) making them an important part of greenhouse gas (GHG) inventorying. In the contiguous United States (CONUS), a coastal wetland inventory was recently calculated by combining maps of wetland type and change with soil, biomass, and CH4 flux data from a literature review. We assess uncertainty in this developing...
Authors
James Holmquist, Lisamarie Windham-Myers, Blanca Bernal, Kristin B. Byrd, Steve Crooks, Meagan J. Eagle, Nathan Herold, Sara Knox, Kevin Kroeger, John McCombs, J. Patrick Megonigal, Lu Meng, James T. Morris, Ariana Eileen Sutton-Grier, Tiffany G. Troxler, Donald E. Weller
Natural climate solutions for the United States
Limiting climate warming to
Authors
Joseph E. Fargione, Steven Bassett, Timothy Boucher, Scott D. Bridgham, Richard T. Conant, Susan C. Cook-Patton, Peter W. Ellis, Alessandra Falcucci, James W. Fourqurean, Trisha Gopalakrishna, Huan Gu, Benjamin Henderson, Matthew D. Hurteau, Kevin Kroeger, Timm Kroeger, Tyler J. Lark, Sara M. Leavitt, Guy Lomax, Robert I. McDonald, Patrick Megonigal, Daniela A. Miteva, Curtis J. Richardson, Jonathan Sanderman, David Shoch, Seth A. Spawn, Joseph W. Veldman, Christopher P. Williams, Peter B. Woodbury, Chris Zganjar, Marci Baranski, Patricia Elias, Richard A. Houghton, Emily Landis, Emily McGlynn, William H. Schlesinger, Juha V. Siikamaki, Ariana Eileen Sutton-Grier, Bronson W. Griscom
Blue carbon as a tool to support coastal management and restoration: Bringing wetlands to market case study
A collaborative research approach involving substantial end user and stakeholder engagement was applied to great effect to guide broad, integrated investigation of the science, policy, and management of blue carbon and carbon markets as drivers for coastal wetland management and restoration.Expanding awareness about blue carbon concepts among local, state, and federal agencies and the...
Authors
Tonna-Marie Surgeon-Rogers, Kevin Kroeger, Meagan J. Eagle, Omar I. Abdul-Aziz, Jianwu Tang, Serena Moseman-Valtierra
Deciphering the dynamics of inorganic carbon export from intertidal salt marshes using high-frequency measurements
The lateral export of carbon from coastal marshes via tidal exchange is a key component of the marsh carbon budget and coastal carbon cycles. However, the magnitude of this export has been difficult to accurately quantify due to complex tidal dynamics and seasonal cycling of carbon. In this study, we use in situ, high-frequency measurements of dissolved inorganic carbon (DIC) and water...
Authors
Sophie N. Chu, Zhaohui Aleck Wang, Meagan J. Eagle, Kevin Kroeger, Neil Kamal Ganju
Geochemical conditions and nitrogen transport in nearshore groundwater and the subterranean estuary at a Cape Cod embayment, East Falmouth, Massachusetts, 2013–14
Nitrogen transport and transformation were studied during 2013 to 2014 by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, in a subterranean estuary beneath onshore locations on the Seacoast Shores peninsula, a residential area in Falmouth, Massachusetts, served by septic systems and cesspools, and adjacent offshore locations in the Eel River, a...
Authors
John A. Colman, Denis R. LeBlanc, J.K. Böhlke, Timothy McCobb, Kevin Kroeger, Marcel Belaval, Thomas C. Cambareri, Gillian F. Pirolli, T. Wallace Brooks, Mary E. Garren, Tobias B. Stover, Ann Keeley
Passive experimental warming decouples air and sediment temperatures in a salt marsh
Open top chambers (OTCs) are a commonly used passive warming technique in experimental warming studies. OTCs have been shown to be effective in multiple types of terrestrial systems, but their utility in wetland environments remains uncertain. The objective of this work was to evaluate the effectiveness of using OTCs to warm a temperate salt marsh across diurnal and seasonal cycles. We...
Authors
Joanna C. Carey, Kevin Kroeger, Babak Zafari, Jianwu Tang
Environmental controls, emergent scaling, and predictions of greenhouse gas (GHG) fluxes in coastal salt marshes
Coastal salt marshes play an important role in mitigating global warming by removing atmospheric carbon at a high rate. We investigated the environmental controls and emergent scaling of major greenhouse gas (GHG) fluxes such as carbon dioxide (CO2) and methane (CH4) in coastal salt marshes by conducting data analytics and empirical modeling. The underlying hypothesis is that the salt...
Authors
Omar I. Abdul-Aziz, Khandker S. Ishitaq, Jianwu Tang, Serena Moseman-Valtierra, Kevin Kroeger, Meagan J. Eagle, Jordan Mora, Kate Morkeski
Carbon budget of tidal wetlands, estuaries, and shelf waters of eastern North America
Carbon cycling in the coastal zone affects global carbon budgets and is critical for understanding the urgent issues of hypoxia, acidification, and tidal wetland loss. However, there are no regional carbon budgets spanning the three main ecosystems in coastal waters: tidal wetlands, estuaries, and shelf waters. Here we construct such a budget for eastern North America using historical...
Authors
Raymond G. Najjar, M. Herrmann, Richard Alexander, E.W. Boyer, David J. Burdige, D. Butman, Wei-Jun Cai, E.A. Canuel, R.F. Chen, M. A. M. Friedrichs, R.A. Feagin, P. C. Griffith, A.L. Hinson, J.R. Holmquist, X. Hu, W.M. Kemp, Kevin Kroeger, Antonio Mannino, S.L. McCallister, W.R. McGillis, M.R. Mulholland, C. H. Pilskaln, J. Barrett Salisbury, Sergio Signorini, P. St. Laurent, H. Tian, Maria Tzortziou, P. Vlahos, Zhanming Wan, R. C. Zimmerman
Science and Products
Filter Total Items: 23
No Result Found
Filter Total Items: 68
Tidal wetland gross primary production across the continental United States, 2000–2019
We mapped tidal wetland gross primary production (GPP) with unprecedented detail for multiple wetland types across the continental United States (CONUS) at 16‐day intervals for the years 2000–2019. To accomplish this task, we developed the spatially explicit Blue Carbon (BC) model, which combined tidal wetland cover and field‐based eddy covariance tower data into a single Bayesian...
Authors
R.A. Feagin, Inke Forbrich, T. P. Huff, J.G. Barr, J. Ruiz-Plancarte, J.D. Fuentes, Raymond G. Najjar, R. Vargas, A. Vazquez Lule, Lisamarie Windham-Myers, Kevin Kroeger, E. J. Ward, G.W. Moore, M. Leclerc, Ken W. Krauss, Camille L. Stagg, Merryl Alber, S. H. Knox, K. V. R. Schafer, T.S. Bianchi, Jack Hutchings, H. Nahrawi, A. Noormets, B. Mitra, Aline Jaimes, A.L. Hinson, Brian Bergamaschi, J.S. King, G. Miao
Phytoplankton community structure response to groundwater-borne nutrients in the inland bays, Delaware
To determine the impacts of groundwater-borne nutrients on phytoplankton biomass and community structure, we conducted a series of mesocosm experiments in the Inland Bays of Delaware. Four treatments were tested, including mesocosms coupled directly to submarine groundwater seepage, mesocosms with the addition of pumped submarine groundwater, mesocosms with the addition of phosphate, and...
Authors
Daniel Torre, Kathryn Coyne, Kevin Kroeger, Joanna K. York
Water salinity and inundation control soil carbon decomposition during salt marsh restoration: An incubation experiment
Coastal wetlands are a significant carbon (C) sink since they store carbon in anoxic soils. This ecosystem service is impacted by hydrologic alteration and management of these coastal habitats. Efforts to restore tidal flow to former salt marshes have increased in recent decades and are generally associated with alteration of water inundation levels and salinity. This study examined the...
Authors
Faming Wang, Kevin Kroeger, Meagan J. Eagle, John W. Pohlman, Jianwu Tang
Salt marsh ecosystem restructuring enhances elevation resilience and carbon storage during accelerating relative sea-level rise
Salt marshes respond to sea-level rise through a series of complex and dynamic bio-physical feedbacks. In this study, we found that sea-level rise triggered salt marsh habitat restructuring, with the associated vegetation changes enhancing salt marsh elevation resilience. A continuous record of marsh elevation relative to sea level that includes reconstruction of high-resolution, sub...
Authors
Meagan J. Eagle, Christopher V. Maio, Kevin Kroeger, Andrea D. Hawkes, Jordan Mora, Richard Sullivan, Stephanie Madsen, Richard Michael Buzard, Niamh Cahill, Jeffrey P. Donnelly
Uncertainty in United States coastal wetland greenhouse gas inventorying
Coastal wetlands store carbon dioxide (CO2) and emit CO2 and methane (CH4) making them an important part of greenhouse gas (GHG) inventorying. In the contiguous United States (CONUS), a coastal wetland inventory was recently calculated by combining maps of wetland type and change with soil, biomass, and CH4 flux data from a literature review. We assess uncertainty in this developing...
Authors
James Holmquist, Lisamarie Windham-Myers, Blanca Bernal, Kristin B. Byrd, Steve Crooks, Meagan J. Eagle, Nathan Herold, Sara Knox, Kevin Kroeger, John McCombs, J. Patrick Megonigal, Lu Meng, James T. Morris, Ariana Eileen Sutton-Grier, Tiffany G. Troxler, Donald E. Weller
Natural climate solutions for the United States
Limiting climate warming to
Authors
Joseph E. Fargione, Steven Bassett, Timothy Boucher, Scott D. Bridgham, Richard T. Conant, Susan C. Cook-Patton, Peter W. Ellis, Alessandra Falcucci, James W. Fourqurean, Trisha Gopalakrishna, Huan Gu, Benjamin Henderson, Matthew D. Hurteau, Kevin Kroeger, Timm Kroeger, Tyler J. Lark, Sara M. Leavitt, Guy Lomax, Robert I. McDonald, Patrick Megonigal, Daniela A. Miteva, Curtis J. Richardson, Jonathan Sanderman, David Shoch, Seth A. Spawn, Joseph W. Veldman, Christopher P. Williams, Peter B. Woodbury, Chris Zganjar, Marci Baranski, Patricia Elias, Richard A. Houghton, Emily Landis, Emily McGlynn, William H. Schlesinger, Juha V. Siikamaki, Ariana Eileen Sutton-Grier, Bronson W. Griscom
Blue carbon as a tool to support coastal management and restoration: Bringing wetlands to market case study
A collaborative research approach involving substantial end user and stakeholder engagement was applied to great effect to guide broad, integrated investigation of the science, policy, and management of blue carbon and carbon markets as drivers for coastal wetland management and restoration.Expanding awareness about blue carbon concepts among local, state, and federal agencies and the...
Authors
Tonna-Marie Surgeon-Rogers, Kevin Kroeger, Meagan J. Eagle, Omar I. Abdul-Aziz, Jianwu Tang, Serena Moseman-Valtierra
Deciphering the dynamics of inorganic carbon export from intertidal salt marshes using high-frequency measurements
The lateral export of carbon from coastal marshes via tidal exchange is a key component of the marsh carbon budget and coastal carbon cycles. However, the magnitude of this export has been difficult to accurately quantify due to complex tidal dynamics and seasonal cycling of carbon. In this study, we use in situ, high-frequency measurements of dissolved inorganic carbon (DIC) and water...
Authors
Sophie N. Chu, Zhaohui Aleck Wang, Meagan J. Eagle, Kevin Kroeger, Neil Kamal Ganju
Geochemical conditions and nitrogen transport in nearshore groundwater and the subterranean estuary at a Cape Cod embayment, East Falmouth, Massachusetts, 2013–14
Nitrogen transport and transformation were studied during 2013 to 2014 by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, in a subterranean estuary beneath onshore locations on the Seacoast Shores peninsula, a residential area in Falmouth, Massachusetts, served by septic systems and cesspools, and adjacent offshore locations in the Eel River, a...
Authors
John A. Colman, Denis R. LeBlanc, J.K. Böhlke, Timothy McCobb, Kevin Kroeger, Marcel Belaval, Thomas C. Cambareri, Gillian F. Pirolli, T. Wallace Brooks, Mary E. Garren, Tobias B. Stover, Ann Keeley
Passive experimental warming decouples air and sediment temperatures in a salt marsh
Open top chambers (OTCs) are a commonly used passive warming technique in experimental warming studies. OTCs have been shown to be effective in multiple types of terrestrial systems, but their utility in wetland environments remains uncertain. The objective of this work was to evaluate the effectiveness of using OTCs to warm a temperate salt marsh across diurnal and seasonal cycles. We...
Authors
Joanna C. Carey, Kevin Kroeger, Babak Zafari, Jianwu Tang
Environmental controls, emergent scaling, and predictions of greenhouse gas (GHG) fluxes in coastal salt marshes
Coastal salt marshes play an important role in mitigating global warming by removing atmospheric carbon at a high rate. We investigated the environmental controls and emergent scaling of major greenhouse gas (GHG) fluxes such as carbon dioxide (CO2) and methane (CH4) in coastal salt marshes by conducting data analytics and empirical modeling. The underlying hypothesis is that the salt...
Authors
Omar I. Abdul-Aziz, Khandker S. Ishitaq, Jianwu Tang, Serena Moseman-Valtierra, Kevin Kroeger, Meagan J. Eagle, Jordan Mora, Kate Morkeski
Carbon budget of tidal wetlands, estuaries, and shelf waters of eastern North America
Carbon cycling in the coastal zone affects global carbon budgets and is critical for understanding the urgent issues of hypoxia, acidification, and tidal wetland loss. However, there are no regional carbon budgets spanning the three main ecosystems in coastal waters: tidal wetlands, estuaries, and shelf waters. Here we construct such a budget for eastern North America using historical...
Authors
Raymond G. Najjar, M. Herrmann, Richard Alexander, E.W. Boyer, David J. Burdige, D. Butman, Wei-Jun Cai, E.A. Canuel, R.F. Chen, M. A. M. Friedrichs, R.A. Feagin, P. C. Griffith, A.L. Hinson, J.R. Holmquist, X. Hu, W.M. Kemp, Kevin Kroeger, Antonio Mannino, S.L. McCallister, W.R. McGillis, M.R. Mulholland, C. H. Pilskaln, J. Barrett Salisbury, Sergio Signorini, P. St. Laurent, H. Tian, Maria Tzortziou, P. Vlahos, Zhanming Wan, R. C. Zimmerman
*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