John Crusius (Former Employee)
Science and Products
Filter Total Items: 40
Continuous resistivity profiling data from the Corsica River Estuary, Maryland Continuous resistivity profiling data from the Corsica River Estuary, Maryland
Submarine groundwater discharge (SGD) into Maryland's Corsica River Estuary was investigated as part of a larger study to determine its importance in nutrient delivery to the Chesapeake Bay. The Corsica River Estuary represents a coastal lowland setting typical of much of the eastern bay. An interdisciplinary U.S. Geological Survey (USGS) science team conducted field operations in the...
Authors
V.A. Cross, J.F. Bratton, C.R. Worley, John Crusius, K.D. Kroeger
Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation
Riverine iron (Fe) derived from glacial weathering is a critical micronutrient source to ecosystems of the Gulf of Alaska (GoA). Here we demonstrate that the source and chemical nature of riverine Fe input to the GoA could change dramatically due to the widespread watershed deglaciation that is underway. We examine Fe size partitioning, speciation, and isotopic composition in tributaries...
Authors
A.W. Schroth, John Crusius, F. Chever, B.C. Bostick, O.J. Rouxel
Use of pharmaceuticals and pesticides to constrain nutrient sources in coastal groundwater of northwestern Long Island, New York, USA Use of pharmaceuticals and pesticides to constrain nutrient sources in coastal groundwater of northwestern Long Island, New York, USA
In developed, non-agricultural, unsewered areas, septic systems and fertilizer application to lawns and gardens represent two major sources of nitrogen to coastal groundwater, in addition to atmospheric input. This study was designed to distinguish between these two possible nitrogen sources by analyzing groundwater samples for pharmaceutical residuals, because fertilizers do not contain...
Authors
S. Zhao, P. Zhang, John Crusius, K.D. Kroeger, J.F. Bratton
Short-term nitrogen additions can shift a coastal wetland from a sink to a source of N2O Short-term nitrogen additions can shift a coastal wetland from a sink to a source of N2O
Coastal salt marshes sequester carbon at high rates relative to other ecosystems and emit relatively little methane particularly compared to freshwater wetlands. However, fluxes of all major greenhouse gases (N2O, CH4, and CO2) need to be quantified for accurate assessment of the climatic roles of these ecosystems. Anthropogenic nitrogen inputs (via run-off, atmospheric deposition, and...
Authors
Serena Moseman-Valtierra, Rosalinda Gonzalez, Kevin D. Kroeger, Jianwu Tang, Wei Chun Chao, John Crusius, John F. Bratton, Adrian G. Mann, James Shelton
Glacial flour dust storms in the Gulf of Alaska: hydrologic and meteorological controls and their importance as a source of bioavailable iron Glacial flour dust storms in the Gulf of Alaska: hydrologic and meteorological controls and their importance as a source of bioavailable iron
Iron is an essential micronutrient that limits primary productivity in much of the ocean, including the Gulf of Alaska (GoA). However, the processes that transport iron to the ocean surface are poorly quantified. We combine satellite and meteorological data to provide the first description of widespread dust transport from coastal Alaska into the GoA. Dust is frequently transported from...
Authors
John Crusius, A.W. Schroth, S. Gasso, C.M. Moy, R.C. Levy, M. Gatica
Rayleigh-based, multi-element coral thermometry: A biomineralization approach to developing climate proxies Rayleigh-based, multi-element coral thermometry: A biomineralization approach to developing climate proxies
This study presents a new approach to coral thermometry that deconvolves the influence of water temperature on skeleton composition from that of “vital effects”, and has the potential to provide estimates of growth temperatures that are accurate to within a few tenths of a degree Celsius from both tropical and cold-water corals. Our results provide support for a physico-chemical model of...
Authors
G.A. Gaetani, A.L. Cohen, Z. Wang, John Crusius
Science and Products
Filter Total Items: 40
Continuous resistivity profiling data from the Corsica River Estuary, Maryland Continuous resistivity profiling data from the Corsica River Estuary, Maryland
Submarine groundwater discharge (SGD) into Maryland's Corsica River Estuary was investigated as part of a larger study to determine its importance in nutrient delivery to the Chesapeake Bay. The Corsica River Estuary represents a coastal lowland setting typical of much of the eastern bay. An interdisciplinary U.S. Geological Survey (USGS) science team conducted field operations in the...
Authors
V.A. Cross, J.F. Bratton, C.R. Worley, John Crusius, K.D. Kroeger
Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation
Riverine iron (Fe) derived from glacial weathering is a critical micronutrient source to ecosystems of the Gulf of Alaska (GoA). Here we demonstrate that the source and chemical nature of riverine Fe input to the GoA could change dramatically due to the widespread watershed deglaciation that is underway. We examine Fe size partitioning, speciation, and isotopic composition in tributaries...
Authors
A.W. Schroth, John Crusius, F. Chever, B.C. Bostick, O.J. Rouxel
Use of pharmaceuticals and pesticides to constrain nutrient sources in coastal groundwater of northwestern Long Island, New York, USA Use of pharmaceuticals and pesticides to constrain nutrient sources in coastal groundwater of northwestern Long Island, New York, USA
In developed, non-agricultural, unsewered areas, septic systems and fertilizer application to lawns and gardens represent two major sources of nitrogen to coastal groundwater, in addition to atmospheric input. This study was designed to distinguish between these two possible nitrogen sources by analyzing groundwater samples for pharmaceutical residuals, because fertilizers do not contain...
Authors
S. Zhao, P. Zhang, John Crusius, K.D. Kroeger, J.F. Bratton
Short-term nitrogen additions can shift a coastal wetland from a sink to a source of N2O Short-term nitrogen additions can shift a coastal wetland from a sink to a source of N2O
Coastal salt marshes sequester carbon at high rates relative to other ecosystems and emit relatively little methane particularly compared to freshwater wetlands. However, fluxes of all major greenhouse gases (N2O, CH4, and CO2) need to be quantified for accurate assessment of the climatic roles of these ecosystems. Anthropogenic nitrogen inputs (via run-off, atmospheric deposition, and...
Authors
Serena Moseman-Valtierra, Rosalinda Gonzalez, Kevin D. Kroeger, Jianwu Tang, Wei Chun Chao, John Crusius, John F. Bratton, Adrian G. Mann, James Shelton
Glacial flour dust storms in the Gulf of Alaska: hydrologic and meteorological controls and their importance as a source of bioavailable iron Glacial flour dust storms in the Gulf of Alaska: hydrologic and meteorological controls and their importance as a source of bioavailable iron
Iron is an essential micronutrient that limits primary productivity in much of the ocean, including the Gulf of Alaska (GoA). However, the processes that transport iron to the ocean surface are poorly quantified. We combine satellite and meteorological data to provide the first description of widespread dust transport from coastal Alaska into the GoA. Dust is frequently transported from...
Authors
John Crusius, A.W. Schroth, S. Gasso, C.M. Moy, R.C. Levy, M. Gatica
Rayleigh-based, multi-element coral thermometry: A biomineralization approach to developing climate proxies Rayleigh-based, multi-element coral thermometry: A biomineralization approach to developing climate proxies
This study presents a new approach to coral thermometry that deconvolves the influence of water temperature on skeleton composition from that of “vital effects”, and has the potential to provide estimates of growth temperatures that are accurate to within a few tenths of a degree Celsius from both tropical and cold-water corals. Our results provide support for a physico-chemical model of...
Authors
G.A. Gaetani, A.L. Cohen, Z. Wang, John Crusius