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Articles 1 - 11 of 11
Full-Text Articles in Biogeochemistry
Effects Of Acid Deposition And Changing Climate On The Hydrochemistry And Critical Loads Of Watersheds In The Adirondack Region Of New York, Shuai Shao
Dissertations - ALL
Despite decreases in acidic deposition since the 1970s, the recovery of surface waters from acidification has been limited primarily due to the depletion of exchangeable base cations, net mineralization of organic sulfur and nitrogen and release of previously retained SO42- and NO3-, and increases in concentrations of naturally occurring organic acids from soil. The future recovery of stream chemistry from acidic deposition may be altered by projected increases in temperature and precipitation associated with a changing climate. The goals of this study were to conduct a modeling analysis of the response of soils and streams in the Adirondack Park, New …
Net Geochemical Release Of Base Cations From 25 Forested Watersheds In The Catskill Region Of New York, Sara C. Nieman, Chris E. Johnson
Net Geochemical Release Of Base Cations From 25 Forested Watersheds In The Catskill Region Of New York, Sara C. Nieman, Chris E. Johnson
Civil and Environmental Engineering - All Scholarship
Chemical weathering of minerals is the principal mechanism by which base cations (Ca2+, Mg2+, K+, and Na+) are released and acidity is neutralized in soils, bedrock and drainage waters. Quantifying the release of base cations from watershed soils is therefore crucial for the calculation of “critical loads” of atmospheric acidity to forest ecosystems. We used a mass-balance approach to estimate the rate of release of base cations in 25 headwater catchments in the Catskill region of New York, an area historically subject to high inputs of acid deposition. In 2010-2013, total net …
Carbonate Paleothermometry In Fayetteville Green Lake, New York, Micah Wiesner
Carbonate Paleothermometry In Fayetteville Green Lake, New York, Micah Wiesner
Theses - ALL
Lacustrine carbonates are important paleoclimate archives, but unknowns in the seasonal timing and depth of precipitation obscure the interpretation of temperatures associated with them. The clumped isotope paleothermometer records the formation temperature T(D47) of carbonates. This study examines a set of lacustrine carbonates formed in the water column, in addition to carbonate from a sediment core, to better understand the depth and seasonality of carbonate formation in a lacustrine setting. We test that, regardless of season and formation temperature, lacustrine carbonates form in isotopic equilibrium with respect to D47 and d18O fractionation. Further, we account for the effect of our …
Carbonate Paleothermometry In Fayetteville Green Lake, New York, Micah Wiesner
Carbonate Paleothermometry In Fayetteville Green Lake, New York, Micah Wiesner
Theses - ALL
Lacustrine carbonates are important paleoclimate archives, but unknowns in the seasonal timing and depth of precipitation obscure the interpretation of temperatures associated with them. The clumped isotope paleothermometer records the formation temperature T(D47) of carbonates. This study examines a set of lacustrine carbonates formed in the water column, in addition to carbonate from a sediment core, to better understand the depth and seasonality of carbonate formation in a lacustrine setting. We test that, regardless of season and formation temperature, lacustrine carbonates form in isotopic equilibrium with respect to D47 and d18O fractionation. Further, we account for the effect of our …
Silica Uptake And Release In Live And Decaying Biomass In A Northern Hardwood Forest, Wim Clymans, Daniel J. Conley, John J. Battles, Patrick J. Frings, Mary Margaret Koppers, Gene E. Likens, Chris E. Johnson
Silica Uptake And Release In Live And Decaying Biomass In A Northern Hardwood Forest, Wim Clymans, Daniel J. Conley, John J. Battles, Patrick J. Frings, Mary Margaret Koppers, Gene E. Likens, Chris E. Johnson
Civil and Environmental Engineering - All Scholarship
In terrestrial ecosystems, a large portion (20–80%) of the dissolved Si (DSi) in soil solution has passed through vegetation. While the importance of this “terrestrial Si filter” is generally accepted, few data exist on the pools and fluxes of Si in forest vegetation and the rate of release of Si from decomposing plant tissues. We quantified the pools and fluxes of Si through vegetation and coarse woody debris (CWD) in a northern hardwood forest ecosystem (Watershed 6, W6) at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire, USA. Previous work suggested that the decomposition of CWD may have significantly …
Soil Chemistry On Watershed 1: 1998 - 2014, Chris E. Johnson
Soil Chemistry On Watershed 1: 1998 - 2014, Chris E. Johnson
Civil and Environmental Engineering - All Scholarship
No abstract provided.
Mass And Nutrient Loss In Decaying Hardwood Boles At Hubbard Brook, Chris E. Johnson
Mass And Nutrient Loss In Decaying Hardwood Boles At Hubbard Brook, Chris E. Johnson
Civil and Environmental Engineering - All Scholarship
No abstract provided.
Will Hubbard Brook Soils Be A Source Or Sink Of Carbon In A Changing Climate?, Chris E. Johnson
Will Hubbard Brook Soils Be A Source Or Sink Of Carbon In A Changing Climate?, Chris E. Johnson
Civil and Environmental Engineering - All Scholarship
No abstract provided.
Using Emerging Methods To Investigate Stream And Groundwater Interaction At Multiple Spatial Scales, Martin Ashley Briggs
Using Emerging Methods To Investigate Stream And Groundwater Interaction At Multiple Spatial Scales, Martin Ashley Briggs
Earth & Environmental Sciences - Dissertations
Fundamentally, streams represent physical conduits of water across gradients, yet a more holistic definition reveals stream corridors support a mosaic of living communities in a blend of surface and ground waters. The physical and biogeochemical patterns these dynamic systems support affect natural habitat and water quality, directly impacting the human experience. Our understanding of stream and groundwater interactions is at a time of rapid expansion due to an increase in environmental awareness, accountability, and emerging techniques which can be used to decipher underlying controls and develop predictive relationships. Water temperature has been used as a qualitative environmental tracer during the …
Using Equal‐Area Quadratic Splines To Compute Depth‐ Weighted Averages Of Soil Chemical Parameters, Chris E. Johnson, Jeremy Tamargo
Using Equal‐Area Quadratic Splines To Compute Depth‐ Weighted Averages Of Soil Chemical Parameters, Chris E. Johnson, Jeremy Tamargo
Civil and Environmental Engineering - All Scholarship
No abstract provided.
Are “Quantitative” Pits Still Necessary At Hubbard Brook?, Chris E. Johnson
Are “Quantitative” Pits Still Necessary At Hubbard Brook?, Chris E. Johnson
Civil and Environmental Engineering - All Scholarship
No abstract provided.