Adina Paytan | University of California, Santa Cruz (original) (raw)
Uploads
Papers by Adina Paytan
Estuaries and Coasts, Jun 28, 2012
Nature, Dec 1, 1993
THE strontium isotope ratio in sea water is influenced by climate, tectonics, weathering and hydr... more THE strontium isotope ratio in sea water is influenced by climate, tectonics, weathering and hydrothermal activity at ocean ridges 1���4. Its evolution through time, determined primarily by measuring the strontium isotope composition of marine carbonates, holds information about variations in these processes, and is also useful for stratigraphic correlation and dating 5���7. Carbonates are absent from some marine sediments such as siliceous oozes and red clays, and can be significantly diagenetically altered in others, especially in Eocene and older ...
Proceedings of the National Academy of Sciences of the United States of America, Mar 9, 2015
Marine Chemistry, Jun 1, 2003
AGUFM, Dec 1, 2001
Abstract Marine barite may serve as a proxy to reconstruct past export production (Dymond, 1992).... more Abstract Marine barite may serve as a proxy to reconstruct past export production (Dymond, 1992). In most studies sedimentary barite accumulation is not measured directly, instead a parameter termed excess barium (Baexs), also referred to as biogenic barium, is used to estimate the barite content. Baexs is defined as the total Ba concentration in the sediment minus the Ba associated with terrigenous material. Baexs is calculated by normalization to a constant Ba/Al ratio, typically the average shale ratio. This application assumes that (1) all ...
AGU Fall Meeting Abstracts, Dec 1, 2009
Abstract Multiple studies have attempted to reconstruct Quaternary climate variability in Meso-Am... more Abstract Multiple studies have attempted to reconstruct Quaternary climate variability in Meso-America and the Caribbean region conditions may drive climate on a global scale and by the realization that the region is well-placed to track past shifts in the average position of the Intertropical Convergence Zone (ITCZ), which is a major control on precipitation and drought occurrence in tropical and sub-tropical areas of the world. With this in mind, we seek to develop a new record of late Holocene paleosalinity, freshwater input and ...
AGU Fall Meeting Abstracts, Dec 1, 2012
AGU Fall Meeting Abstracts, Dec 16, 2014
Ecological Indicators, Nov 1, 2020
Earth and Planetary Science Letters, Feb 1, 2016
Environmental Science & Technology, Oct 6, 2015
Assessing the magnitude of groundwater discharge in high latitude areas during climate change is ... more Assessing the magnitude of groundwater discharge in high latitude areas during climate change is critical. While global warming trends continue to remodel aquifer systems affecting water and constituent fluxes to areas of discharge, the present status of groundwater fluxes in high latitudes is yet not well constrained. Here we report assessments of the current state of groundwater discharge to surface water bodies from an extended field study in Alaska with contrasting permafrost coverage. Mass balances of the natural groundwater tracer (222Rn, radon) indicate similar magnitude of freshwater/meltwater fluxes at all three sites. However, temporal and spatial radon concentration variations in the receiving waters show non-uniform flux distributions. Different controls govern groundwater discharge at these sites. In north Pacific coastal areas with sporadic permafrost, the major driver of discharge to the ocean is tidal pumping, due to the large tidal oscillations, whereas at Barrow Point, a site with continuous permafrost and small tidal amplitudes, fluxes are mostly affected by seasonal permafrost thawing. Electrical resistivity tomography (ERT) revealed extended areas of low resistivity (i.e. meltwater in the subsurface) alongshores combined with high radon in surface water that suggests that groundwater-surface water interactions might expend active layers promoting groundwater discharge.
Limnology and Oceanography, Jul 1, 2006
Geochimica et Cosmochimica Acta, Apr 1, 1995
San Francisco Estuary and Watershed Science, Jun 24, 2022
Estuaries and Coasts, Jun 28, 2012
Nature, Dec 1, 1993
THE strontium isotope ratio in sea water is influenced by climate, tectonics, weathering and hydr... more THE strontium isotope ratio in sea water is influenced by climate, tectonics, weathering and hydrothermal activity at ocean ridges 1���4. Its evolution through time, determined primarily by measuring the strontium isotope composition of marine carbonates, holds information about variations in these processes, and is also useful for stratigraphic correlation and dating 5���7. Carbonates are absent from some marine sediments such as siliceous oozes and red clays, and can be significantly diagenetically altered in others, especially in Eocene and older ...
Proceedings of the National Academy of Sciences of the United States of America, Mar 9, 2015
Marine Chemistry, Jun 1, 2003
AGUFM, Dec 1, 2001
Abstract Marine barite may serve as a proxy to reconstruct past export production (Dymond, 1992).... more Abstract Marine barite may serve as a proxy to reconstruct past export production (Dymond, 1992). In most studies sedimentary barite accumulation is not measured directly, instead a parameter termed excess barium (Baexs), also referred to as biogenic barium, is used to estimate the barite content. Baexs is defined as the total Ba concentration in the sediment minus the Ba associated with terrigenous material. Baexs is calculated by normalization to a constant Ba/Al ratio, typically the average shale ratio. This application assumes that (1) all ...
AGU Fall Meeting Abstracts, Dec 1, 2009
Abstract Multiple studies have attempted to reconstruct Quaternary climate variability in Meso-Am... more Abstract Multiple studies have attempted to reconstruct Quaternary climate variability in Meso-America and the Caribbean region conditions may drive climate on a global scale and by the realization that the region is well-placed to track past shifts in the average position of the Intertropical Convergence Zone (ITCZ), which is a major control on precipitation and drought occurrence in tropical and sub-tropical areas of the world. With this in mind, we seek to develop a new record of late Holocene paleosalinity, freshwater input and ...
AGU Fall Meeting Abstracts, Dec 1, 2012
AGU Fall Meeting Abstracts, Dec 16, 2014
Ecological Indicators, Nov 1, 2020
Earth and Planetary Science Letters, Feb 1, 2016
Environmental Science & Technology, Oct 6, 2015
Assessing the magnitude of groundwater discharge in high latitude areas during climate change is ... more Assessing the magnitude of groundwater discharge in high latitude areas during climate change is critical. While global warming trends continue to remodel aquifer systems affecting water and constituent fluxes to areas of discharge, the present status of groundwater fluxes in high latitudes is yet not well constrained. Here we report assessments of the current state of groundwater discharge to surface water bodies from an extended field study in Alaska with contrasting permafrost coverage. Mass balances of the natural groundwater tracer (222Rn, radon) indicate similar magnitude of freshwater/meltwater fluxes at all three sites. However, temporal and spatial radon concentration variations in the receiving waters show non-uniform flux distributions. Different controls govern groundwater discharge at these sites. In north Pacific coastal areas with sporadic permafrost, the major driver of discharge to the ocean is tidal pumping, due to the large tidal oscillations, whereas at Barrow Point, a site with continuous permafrost and small tidal amplitudes, fluxes are mostly affected by seasonal permafrost thawing. Electrical resistivity tomography (ERT) revealed extended areas of low resistivity (i.e. meltwater in the subsurface) alongshores combined with high radon in surface water that suggests that groundwater-surface water interactions might expend active layers promoting groundwater discharge.
Limnology and Oceanography, Jul 1, 2006
Geochimica et Cosmochimica Acta, Apr 1, 1995
San Francisco Estuary and Watershed Science, Jun 24, 2022