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Full-Text Articles in Physical Sciences and Mathematics
A Record Of Atmospheric Co2 During The Last 40,000 Years From The Siple Dome, Antarctica Ice Core, Jinho Ahn, Martin Wahlen, Bruce L. Deck, Ed J. Brook, Paul Andrew Mayewski, Kendrick C. Taylor, James W.C. White
A Record Of Atmospheric Co2 During The Last 40,000 Years From The Siple Dome, Antarctica Ice Core, Jinho Ahn, Martin Wahlen, Bruce L. Deck, Ed J. Brook, Paul Andrew Mayewski, Kendrick C. Taylor, James W.C. White
Earth Science Faculty Scholarship
We have measured the CO2 concentration of air occluded during the last 40,000 years in the deep Siple Dome A ( hereafter Siple Dome) ice core, Antarctica. The general trend of CO2 concentration from Siple Dome ice follows the temperature inferred from the isotopic composition of the ice and is mostly in agreement with other Antarctic ice core CO2 records. CO2 rose initially at similar to 17.5 kyr B. P. ( thousand years before 1950), decreased slowly during the Antarctic Cold Reversal, rose during the Younger Dryas, fell to a local minimum at around 8 kyr B. P., and rose …
Long-Term And Seasonal Variations In Co2: Linkages To Catchment Alkalinity Generation, Stephen A. Norton, B. J. Cosby, I. J. Fernandez, J. S. Kahl, M. Robbins Church
Long-Term And Seasonal Variations In Co2: Linkages To Catchment Alkalinity Generation, Stephen A. Norton, B. J. Cosby, I. J. Fernandez, J. S. Kahl, M. Robbins Church
Earth Science Faculty Scholarship
As atmospheric emissions of S have declined in the Northern Hemisphere, there has been an expectation of increased pH and alkalinity in streams believed to have been acidified by excess S and N. Many streams and lakes have not recovered. Evidence from East Bear Brook in Maine, USA and modelling with the groundwater acid-base model MAGIC (Cosby et al. 1985a,b) indicate that seasonal and yearly variations in soil PCO2 are adequate to enhance or even reverse acid-base (alkalinity) changes anticipated from modest decreases of SO4 in surface waters. Alkalinity is generated in the soil by exchange of H+ from dissociation …