John Crusius
John is a Research Chemist for the Alaska Science Center.
Science and Products
Filter Total Items: 38
Processes influencing the transport and fate of contaminated sediments in the coastal ocean — Boston Harbor and Massachusetts Bay
No abstract available.
Authors
P. Soupy Alexander, Dann S. Blackwood, Jonathan Borden, Michael A. Casso, John Crusius, Joanne Goudreau, Linda H. Kalnejais, Paul J. Lamothe, William R. Martin, Marinna A. Martini, Sandra M. Milbert, Richard R. Rendigs, Frederick L. Sayles, Richard P. Signell, Page C. Valentine, John C. Warner
Putting radon to work: identifying coastal ground-water discharge sites
No abstract available.
Authors
John Crusius, John F. Bratton, Matt Charette
Submarine groundwater discharge to a small estuary estimated from radon and salinity measurements and a box model
Submarine groundwater discharge was quantified by a variety of methods for a 4-day period during the early summer of 2004, in Salt Pond, adjacent to Nauset Marsh, on Cape Cod, USA. Discharge estimates based on radon and salinity took advantage of the presence of the narrow channel connecting Salt Pond to Nauset Marsh, which allowed constructing whole-pond mass balances as water flowed in and out d
Authors
John Crusius, D. Koopmans, John F. Bratton, M.A. Charette, K.D. Kroeger, P. Henderson, L. Ryckman, K. Halloran, John A. Colman
Coastal iron fluxes to surface waters of the NE Pacific: A driver of the marine ecosystem and carbon cycle
No abstract available.
Authors
John Crusius, J.L. Nielsen
A preliminary evaluation of nutrient and ground-water fluxes to the Neuse River Estuary, North Carolina
No abstract available.
Authors
Timothy B. Spruill, John F. Bratton, John Crusius, Beth M. Wrege, G. Strickland
Submarine ground-water discharge and its role in coastal processes and ecosystems
Submarine ground-water discharge (SGD) has recently been recognized as a phenomenon that can strongly influence coastal water and geochemical budgets and drive ecosystem change. For example, the discharge of nutrient-enriched ground water into coastal waters may contribute significantly to eutrophication and blooms of harmful algae. Similarly, the quantity of SGD can also directly affect the avail
Authors
Peter W. Swarzenski, John F. Bratton, John Crusius
Influence of natural organic matter source on copper speciation as demonstrated by Cu binding to fish gills, by ion selective electrode, and by DGT gel sampler
Rainbow trout (Oncorhynchus mykiss, 2 g) were exposed to 0−5 μM total copper in ion-poor water for 3 h in the presence or absence of 10 mg C/L of qualitatively different natural organic matter (NOM) derived from water spanning a large gradient in hydrologic residence time. Accumulation of Cu by trout gills was compared to Cu speciation determined by ion selective electrode (ISE) and by diffusive g
Authors
C.D. Luider, John Crusius, R.C. Playle, P.J. Curtis
Influence of northwest Pacific productivity on North Pacific Intermediate Water oxygen concentrations during the Bølling-Ållerød interval (14.7-12.9 ka)
Elevated productivity in the northwest Pacific is suggested as a new possible control driving past intervals of low-O2 intermediate water along the western continental margin of North America. According to this mechanism, O2 consumption would occur near the site of formation of North Pacific Intermediate Water (NPIW), due to increased respiration of organic carbon in response to a high-productivit
Authors
John Crusius, Thomas F. Pedersen, Stephanie Kienast, Lloyd D. Keigwin, Laurent Labeyrie
Export production in the subarctic North Pacific over the last 800 kyrs: No evidence for iron fertilization?
The subarctic North Pacific is a high nitrate-low chlorophyll (HNLC) region, where phytoplankton growth rates, especially those of diatoms, are enhanced when micronutrient Fe is added. Accordingly, it has been suggested that glacial Fe-laden dust might have increased primary production in this region. This paper reviews published palaeoceanographic records of export production over the last 800 ky
Authors
S.S. Kienast, I.L. Hendy, John Crusius, Thomas F. Pedersen, S.E. Calvert
Bioturbation depths, rates and processes in Massachusetts Bay sediments inferred from modeling of 210Pb and 239 + 240Pu profiles
Profiles of 210Pb and 239 + 15 cm depth or that biodiffusive mixing mediated by other organisms is occurring at depth. Additional constraints from surficial sediment 234Th data suggest that in this half of the cores, the vast majority of the present-day flux of recent, nuclide-bearing material to these core sites is transported over a timescale of a month or more to a depth of a few centimeters be
Authors
John Crusius, Michael H. Bothner, Christopher K. Sommerfield
Mobility of authigenic rhenium, silver, and selenium during postdepositional oxidation in marine sediments
Sedimentary records of redox-sensitive trace elements hold significant potential as indicators of paleoceanographic environmental conditions. Records of Re can reveal the intensity of past reducing conditions in sediments at the time of deposition, whereas records of Ag may record the magnitude of past diatom fluxes to the seafloor. Confidence in paleoenvironmental reconstruction from records of e
Authors
John Crusius, John Thomson
Tale of two pit lakes: initial results of a three-year study of the Main Zone and Waterline pit lakes near Houston, British Columbia, Canada
Pit lakes are becoming increasingly common in North America as well as in the rest of the world. They are created as openpit mines fill passively with ground water and surface inflows on cessation of mining activity. In many instances, the water quality in these pit lakes does not meet regulatory requirements due to a number of influences. The most important are the oxidation of sulfide minerals a
Authors
John Crusius, R. Pieters, A. Leung, P. Whittle, T. Pedersen, G. Lawrence, J.J. McNee
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Filter Total Items: 38
Processes influencing the transport and fate of contaminated sediments in the coastal ocean — Boston Harbor and Massachusetts Bay
No abstract available.AuthorsP. Soupy Alexander, Dann S. Blackwood, Jonathan Borden, Michael A. Casso, John Crusius, Joanne Goudreau, Linda H. Kalnejais, Paul J. Lamothe, William R. Martin, Marinna A. Martini, Sandra M. Milbert, Richard R. Rendigs, Frederick L. Sayles, Richard P. Signell, Page C. Valentine, John C. WarnerPutting radon to work: identifying coastal ground-water discharge sites
No abstract available.AuthorsJohn Crusius, John F. Bratton, Matt CharetteSubmarine groundwater discharge to a small estuary estimated from radon and salinity measurements and a box model
Submarine groundwater discharge was quantified by a variety of methods for a 4-day period during the early summer of 2004, in Salt Pond, adjacent to Nauset Marsh, on Cape Cod, USA. Discharge estimates based on radon and salinity took advantage of the presence of the narrow channel connecting Salt Pond to Nauset Marsh, which allowed constructing whole-pond mass balances as water flowed in and out dAuthorsJohn Crusius, D. Koopmans, John F. Bratton, M.A. Charette, K.D. Kroeger, P. Henderson, L. Ryckman, K. Halloran, John A. ColmanCoastal iron fluxes to surface waters of the NE Pacific: A driver of the marine ecosystem and carbon cycle
No abstract available.AuthorsJohn Crusius, J.L. NielsenA preliminary evaluation of nutrient and ground-water fluxes to the Neuse River Estuary, North Carolina
No abstract available.AuthorsTimothy B. Spruill, John F. Bratton, John Crusius, Beth M. Wrege, G. StricklandSubmarine ground-water discharge and its role in coastal processes and ecosystems
Submarine ground-water discharge (SGD) has recently been recognized as a phenomenon that can strongly influence coastal water and geochemical budgets and drive ecosystem change. For example, the discharge of nutrient-enriched ground water into coastal waters may contribute significantly to eutrophication and blooms of harmful algae. Similarly, the quantity of SGD can also directly affect the availAuthorsPeter W. Swarzenski, John F. Bratton, John CrusiusInfluence of natural organic matter source on copper speciation as demonstrated by Cu binding to fish gills, by ion selective electrode, and by DGT gel sampler
Rainbow trout (Oncorhynchus mykiss, 2 g) were exposed to 0−5 μM total copper in ion-poor water for 3 h in the presence or absence of 10 mg C/L of qualitatively different natural organic matter (NOM) derived from water spanning a large gradient in hydrologic residence time. Accumulation of Cu by trout gills was compared to Cu speciation determined by ion selective electrode (ISE) and by diffusive gAuthorsC.D. Luider, John Crusius, R.C. Playle, P.J. CurtisInfluence of northwest Pacific productivity on North Pacific Intermediate Water oxygen concentrations during the Bølling-Ållerød interval (14.7-12.9 ka)
Elevated productivity in the northwest Pacific is suggested as a new possible control driving past intervals of low-O2 intermediate water along the western continental margin of North America. According to this mechanism, O2 consumption would occur near the site of formation of North Pacific Intermediate Water (NPIW), due to increased respiration of organic carbon in response to a high-productivitAuthorsJohn Crusius, Thomas F. Pedersen, Stephanie Kienast, Lloyd D. Keigwin, Laurent LabeyrieExport production in the subarctic North Pacific over the last 800 kyrs: No evidence for iron fertilization?
The subarctic North Pacific is a high nitrate-low chlorophyll (HNLC) region, where phytoplankton growth rates, especially those of diatoms, are enhanced when micronutrient Fe is added. Accordingly, it has been suggested that glacial Fe-laden dust might have increased primary production in this region. This paper reviews published palaeoceanographic records of export production over the last 800 kyAuthorsS.S. Kienast, I.L. Hendy, John Crusius, Thomas F. Pedersen, S.E. CalvertBioturbation depths, rates and processes in Massachusetts Bay sediments inferred from modeling of 210Pb and 239 + 240Pu profiles
Profiles of 210Pb and 239 + 15 cm depth or that biodiffusive mixing mediated by other organisms is occurring at depth. Additional constraints from surficial sediment 234Th data suggest that in this half of the cores, the vast majority of the present-day flux of recent, nuclide-bearing material to these core sites is transported over a timescale of a month or more to a depth of a few centimeters beAuthorsJohn Crusius, Michael H. Bothner, Christopher K. SommerfieldMobility of authigenic rhenium, silver, and selenium during postdepositional oxidation in marine sediments
Sedimentary records of redox-sensitive trace elements hold significant potential as indicators of paleoceanographic environmental conditions. Records of Re can reveal the intensity of past reducing conditions in sediments at the time of deposition, whereas records of Ag may record the magnitude of past diatom fluxes to the seafloor. Confidence in paleoenvironmental reconstruction from records of eAuthorsJohn Crusius, John ThomsonTale of two pit lakes: initial results of a three-year study of the Main Zone and Waterline pit lakes near Houston, British Columbia, Canada
Pit lakes are becoming increasingly common in North America as well as in the rest of the world. They are created as openpit mines fill passively with ground water and surface inflows on cessation of mining activity. In many instances, the water quality in these pit lakes does not meet regulatory requirements due to a number of influences. The most important are the oxidation of sulfide minerals aAuthorsJohn Crusius, R. Pieters, A. Leung, P. Whittle, T. Pedersen, G. Lawrence, J.J. McNee - Multimedia
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