Kevin D Kroeger, PhD (Former Employee)
Science and Products
Filter Total Items: 23
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Filter Total Items: 71
Passive experimental warming decouples air and sediment temperatures in a salt marsh 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 D. Kroeger, Babak Zafari, Jianwu Tang
Environmental controls, emergent scaling, and predictions of greenhouse gas (GHG) fluxes in coastal salt marshes 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 D. Kroeger, Meagan Gonneea Eagle, Jordan Mora, Kate Morkeski
Carbon budget of tidal wetlands, estuaries, and shelf waters of eastern North America 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
R.G. Najjar, M. Herrmann, Richard B. Alexander, E.W. Boyer, D. J. Burdige, D. Butman, W.-J. 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 D. Kroeger, A. Mannino, S.L. McCallister, W.R. McGillis, M.R. Mulholland, C. H. Pilskaln, J. Salisbury, S. R. Signorini, P. St. Laurent, H. Tian, M Tzortziou, P. Vlahos, Zhanming Wan, R. C. Zimmerman
The magnitude and origin of groundwater discharge to eastern U.S. and Gulf of Mexico coastal waters The magnitude and origin of groundwater discharge to eastern U.S. and Gulf of Mexico coastal waters
Fresh groundwater discharge to coastal environments contributes to the physical and chemical conditions of coastal waters, but the role of coastal groundwater at regional to continental scales remains poorly defined due to diverse hydrologic conditions and the difficulty of tracking coastal groundwater flow paths through heterogeneous subsurface materials. We use three-dimensional...
Authors
Kevin Befus, Kevin D. Kroeger, Christopher G. Smith, Peter W. Swarzenski
Restoring tides to reduce methane emissions in impounded wetlands: A new and potent Blue Carbon climate change intervention Restoring tides to reduce methane emissions in impounded wetlands: A new and potent Blue Carbon climate change intervention
Coastal wetlands are sites of rapid carbon (C) sequestration and contain large soil C stocks. Thus, there is increasing interest in those ecosystems as sites for anthropogenic greenhouse gas emission offset projects (sometimes referred to as “Blue Carbon”), through preservation of existing C stocks or creation of new wetlands to increase future sequestration. Here we show that in the...
Authors
Kevin D. Kroeger, Stephen Crooks, Serena Moseman-Valtierra, Jianwu Tang
Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal
We investigated biogeochemical conditions and watershed features controlling the extent of nitrate removal through microbial dinitrogen (N2) production within the surficial glacial aquifer located on the north and south shores of Long Island, NY, USA. The extent of N2 production differs within portions of the aquifer, with greatest N2 production observed at the south shore of Long Island...
Authors
Beata Szymczycha, Kevin D. Kroeger, John Crusius, John F. Bratton
Temperature response of soil respiration largely unaltered with experimental warming Temperature response of soil respiration largely unaltered with experimental warming
The respiratory release of carbon dioxide (CO2) from soil is a major yet poorly understood flux in the global carbon cycle. Climatic warming is hypothesized to increase rates of soil respiration, potentially fueling further increases in global temperatures. However, despite considerable scientific attention in recent decades, the overall response of soil respiration to anticipated...
Authors
Joanna C. Carey, Jianwu Tang, Pamela H. Templer, Kevin D. Kroeger, Thomas W. Crowther, Andrew J. Burton, Jeffrey S. Dukes, Bridget Emmett, Serita D. Frey, Mary A. Heskel, Lifen Jiang, Megan B. Machmuller, Jacqueline Mohan, Anne Marie Panetta, Peter B. Reich, Sabine Reinsch, Xin Wang, Steven D. Allison, Chris Bamminger, Scott D. Bridgham, Scott L. Collins, Giovanbattista de Dato, William C. Eddy, Brian J. Enquist, Marc Estiarte, John Harte, Amanda Henderson, Bart R. Johnson, Klaus Steenberg Larsen, Yiqi Luo, Sven Marhan, Jerry M. Melillo, Josep Penuelas, Laurel Pfeifer-Meister, Christian Poll, Edward B. Rastetter, Andrew B. Reinmann, Lorien L. Reynolds, Inger K. Schmidt, Gaius R. Shaver, Aaron L. Strong, Vidya Suseela, Albert Tietema
Carbon dioxide fluxes reflect plant zonation and belowground biomass in a coastal marsh Carbon dioxide fluxes reflect plant zonation and belowground biomass in a coastal marsh
Coastal wetlands are major global carbon sinks; however, they are heterogeneous and dynamic ecosystems. To characterize spatial and temporal variability in a New England salt marsh, greenhouse gas (GHG) fluxes were compared among major plant‐defined zones during growing seasons. Carbon dioxide (CO2) and methane (CH4) fluxes were compared in two mensurative experiments during summer...
Authors
Serena Moseman-Valtierra, Omar I. Abdul-Aziz, Jianwu Tang, Khandker S. Ishtiaq, Kate Morkeski, Jordan Mora, Ryan K. Quinn, Rose M. Martin, Katharine Egan, Elizabeth Q. Brannon, Joanna C. Carey, Kevin D. Kroeger
Observations of nearshore groundwater discharge: Kahekili Beach Park submarine springs, Maui, Hawaii Observations of nearshore groundwater discharge: Kahekili Beach Park submarine springs, Maui, Hawaii
Study region The study region encompasses the nearshore, coastal waters off west Maui, Hawaii. Here abundant groundwater—that carries with it a strong land-based fingerprint—discharges into the coastal waters and over a coral reef.Study focus Coastal groundwater discharge is a ubiquitous hydrologic feature that has been shown to impact nearshore ecosystems and material budgets. A unique...
Authors
Peter W. Swarzenski, H. Dulai, K.D. Kroeger, Christopher G. Smith, N. Dimova, C. D. Storlazzi, N.G. Prouty, S. B. Gingerich, C. R. Glenn
Intertidal salt marshes as an important source of inorganic carbon to the coastal ocean Intertidal salt marshes as an important source of inorganic carbon to the coastal ocean
Dynamic tidal export of dissolved inorganic carbon (DIC) to the coastal ocean from highly productive intertidal marshes and its effects on seawater carbonate chemistry are thoroughly evaluated. The study uses a comprehensive approach by combining tidal water sampling of CO2parameters across seasons, continuous in situ measurements of biogeochemically-relevant parameters and water fluxes...
Authors
Zhaohui Aleck Wang, Kevin D. Kroeger, Neil K. Ganju, Meagan Gonneea Eagle, Sophie N. Chu
Significance of groundwater discharge along the coast of Poland as a source of dissolved metals to the southern Baltic Sea Significance of groundwater discharge along the coast of Poland as a source of dissolved metals to the southern Baltic Sea
Fluxes of dissolved trace metals (Cd, Co, Cr, Cu, Mn, Ni, Pb, and Zn) via groundwater discharge along the southern Baltic Sea have been assessed for the first time. Dissolved metal concentrations in groundwater samples were less variable than in seawater and were generally one or two orders of magnitude higher: Cd (2.1–2.8 nmol L− 1), Co (8.70–8.76 nmol L− 1), Cr (18.1–18.5 nmol L− 1)...
Authors
Beata Szymczycha, Kevin D. Kroeger, Janusz Pempkowiak
Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed
Submarine groundwater discharge (SGD) is a small portion of the global water budget, but a potentially large contributor to coastal nutrient budgets due to high concentrations relative to stream discharge. A numerical groundwater flow model of the Inland Bays Watershed, Delaware, USA, was developed to identify the primary hydrogeologic factors that affect groundwater discharge rates and...
Authors
Chrtopher J. Russoniello, Leonard F. Konikow, Kevin D. Kroeger, Cristina Fernandez, A. Scott Andres, Holly A. Michael
Science and Products
Filter Total Items: 23
No Result Found
Filter Total Items: 71
Passive experimental warming decouples air and sediment temperatures in a salt marsh 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 D. Kroeger, Babak Zafari, Jianwu Tang
Environmental controls, emergent scaling, and predictions of greenhouse gas (GHG) fluxes in coastal salt marshes 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 D. Kroeger, Meagan Gonneea Eagle, Jordan Mora, Kate Morkeski
Carbon budget of tidal wetlands, estuaries, and shelf waters of eastern North America 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
R.G. Najjar, M. Herrmann, Richard B. Alexander, E.W. Boyer, D. J. Burdige, D. Butman, W.-J. 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 D. Kroeger, A. Mannino, S.L. McCallister, W.R. McGillis, M.R. Mulholland, C. H. Pilskaln, J. Salisbury, S. R. Signorini, P. St. Laurent, H. Tian, M Tzortziou, P. Vlahos, Zhanming Wan, R. C. Zimmerman
The magnitude and origin of groundwater discharge to eastern U.S. and Gulf of Mexico coastal waters The magnitude and origin of groundwater discharge to eastern U.S. and Gulf of Mexico coastal waters
Fresh groundwater discharge to coastal environments contributes to the physical and chemical conditions of coastal waters, but the role of coastal groundwater at regional to continental scales remains poorly defined due to diverse hydrologic conditions and the difficulty of tracking coastal groundwater flow paths through heterogeneous subsurface materials. We use three-dimensional...
Authors
Kevin Befus, Kevin D. Kroeger, Christopher G. Smith, Peter W. Swarzenski
Restoring tides to reduce methane emissions in impounded wetlands: A new and potent Blue Carbon climate change intervention Restoring tides to reduce methane emissions in impounded wetlands: A new and potent Blue Carbon climate change intervention
Coastal wetlands are sites of rapid carbon (C) sequestration and contain large soil C stocks. Thus, there is increasing interest in those ecosystems as sites for anthropogenic greenhouse gas emission offset projects (sometimes referred to as “Blue Carbon”), through preservation of existing C stocks or creation of new wetlands to increase future sequestration. Here we show that in the...
Authors
Kevin D. Kroeger, Stephen Crooks, Serena Moseman-Valtierra, Jianwu Tang
Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal
We investigated biogeochemical conditions and watershed features controlling the extent of nitrate removal through microbial dinitrogen (N2) production within the surficial glacial aquifer located on the north and south shores of Long Island, NY, USA. The extent of N2 production differs within portions of the aquifer, with greatest N2 production observed at the south shore of Long Island...
Authors
Beata Szymczycha, Kevin D. Kroeger, John Crusius, John F. Bratton
Temperature response of soil respiration largely unaltered with experimental warming Temperature response of soil respiration largely unaltered with experimental warming
The respiratory release of carbon dioxide (CO2) from soil is a major yet poorly understood flux in the global carbon cycle. Climatic warming is hypothesized to increase rates of soil respiration, potentially fueling further increases in global temperatures. However, despite considerable scientific attention in recent decades, the overall response of soil respiration to anticipated...
Authors
Joanna C. Carey, Jianwu Tang, Pamela H. Templer, Kevin D. Kroeger, Thomas W. Crowther, Andrew J. Burton, Jeffrey S. Dukes, Bridget Emmett, Serita D. Frey, Mary A. Heskel, Lifen Jiang, Megan B. Machmuller, Jacqueline Mohan, Anne Marie Panetta, Peter B. Reich, Sabine Reinsch, Xin Wang, Steven D. Allison, Chris Bamminger, Scott D. Bridgham, Scott L. Collins, Giovanbattista de Dato, William C. Eddy, Brian J. Enquist, Marc Estiarte, John Harte, Amanda Henderson, Bart R. Johnson, Klaus Steenberg Larsen, Yiqi Luo, Sven Marhan, Jerry M. Melillo, Josep Penuelas, Laurel Pfeifer-Meister, Christian Poll, Edward B. Rastetter, Andrew B. Reinmann, Lorien L. Reynolds, Inger K. Schmidt, Gaius R. Shaver, Aaron L. Strong, Vidya Suseela, Albert Tietema
Carbon dioxide fluxes reflect plant zonation and belowground biomass in a coastal marsh Carbon dioxide fluxes reflect plant zonation and belowground biomass in a coastal marsh
Coastal wetlands are major global carbon sinks; however, they are heterogeneous and dynamic ecosystems. To characterize spatial and temporal variability in a New England salt marsh, greenhouse gas (GHG) fluxes were compared among major plant‐defined zones during growing seasons. Carbon dioxide (CO2) and methane (CH4) fluxes were compared in two mensurative experiments during summer...
Authors
Serena Moseman-Valtierra, Omar I. Abdul-Aziz, Jianwu Tang, Khandker S. Ishtiaq, Kate Morkeski, Jordan Mora, Ryan K. Quinn, Rose M. Martin, Katharine Egan, Elizabeth Q. Brannon, Joanna C. Carey, Kevin D. Kroeger
Observations of nearshore groundwater discharge: Kahekili Beach Park submarine springs, Maui, Hawaii Observations of nearshore groundwater discharge: Kahekili Beach Park submarine springs, Maui, Hawaii
Study region The study region encompasses the nearshore, coastal waters off west Maui, Hawaii. Here abundant groundwater—that carries with it a strong land-based fingerprint—discharges into the coastal waters and over a coral reef.Study focus Coastal groundwater discharge is a ubiquitous hydrologic feature that has been shown to impact nearshore ecosystems and material budgets. A unique...
Authors
Peter W. Swarzenski, H. Dulai, K.D. Kroeger, Christopher G. Smith, N. Dimova, C. D. Storlazzi, N.G. Prouty, S. B. Gingerich, C. R. Glenn
Intertidal salt marshes as an important source of inorganic carbon to the coastal ocean Intertidal salt marshes as an important source of inorganic carbon to the coastal ocean
Dynamic tidal export of dissolved inorganic carbon (DIC) to the coastal ocean from highly productive intertidal marshes and its effects on seawater carbonate chemistry are thoroughly evaluated. The study uses a comprehensive approach by combining tidal water sampling of CO2parameters across seasons, continuous in situ measurements of biogeochemically-relevant parameters and water fluxes...
Authors
Zhaohui Aleck Wang, Kevin D. Kroeger, Neil K. Ganju, Meagan Gonneea Eagle, Sophie N. Chu
Significance of groundwater discharge along the coast of Poland as a source of dissolved metals to the southern Baltic Sea Significance of groundwater discharge along the coast of Poland as a source of dissolved metals to the southern Baltic Sea
Fluxes of dissolved trace metals (Cd, Co, Cr, Cu, Mn, Ni, Pb, and Zn) via groundwater discharge along the southern Baltic Sea have been assessed for the first time. Dissolved metal concentrations in groundwater samples were less variable than in seawater and were generally one or two orders of magnitude higher: Cd (2.1–2.8 nmol L− 1), Co (8.70–8.76 nmol L− 1), Cr (18.1–18.5 nmol L− 1)...
Authors
Beata Szymczycha, Kevin D. Kroeger, Janusz Pempkowiak
Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed Hydrogeologic controls on groundwater discharge and nitrogen loads in a coastal watershed
Submarine groundwater discharge (SGD) is a small portion of the global water budget, but a potentially large contributor to coastal nutrient budgets due to high concentrations relative to stream discharge. A numerical groundwater flow model of the Inland Bays Watershed, Delaware, USA, was developed to identify the primary hydrogeologic factors that affect groundwater discharge rates and...
Authors
Chrtopher J. Russoniello, Leonard F. Konikow, Kevin D. Kroeger, Cristina Fernandez, A. Scott Andres, Holly A. Michael
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