Open Access. Powered by Scholars. Published by Universities.®
Social and Behavioral Sciences Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Publication Type
Articles 1 - 3 of 3
Full-Text Articles in Social and Behavioral Sciences
Factors Driving Mercury Variability In The Arctic Atmosphere And Ocean Over The Past 30 Years, Jenny A. Fisher, Daniel J. Jacob, Anne L. Soerensen, Helen M. Amos, Elizabeth S. Corbitt, David G. Streets, Qiaoqiao Wang, Robert M. Yantosca, Elsie M. Sunderland
Factors Driving Mercury Variability In The Arctic Atmosphere And Ocean Over The Past 30 Years, Jenny A. Fisher, Daniel J. Jacob, Anne L. Soerensen, Helen M. Amos, Elizabeth S. Corbitt, David G. Streets, Qiaoqiao Wang, Robert M. Yantosca, Elsie M. Sunderland
Jenny A Fisher
[1] Long-term observations at Arctic sites (Alert and Zeppelin) show large interannual variability (IAV) in atmospheric mercury (Hg), implying a strong sensitivity of Hg to environmental factors and potentially to climate change. We use the GEOS-Chem global biogeochemical Hg model to interpret these observations and identify the principal drivers of spring and summer IAV in the Arctic atmosphere and surface ocean from 1979–2008. The model has moderate skill in simulating the observed atmospheric IAV at the two sites (r ~ 0.4) and successfully reproduces a long-term shift at Alert in the timing of the spring minimum from May to April …
Age-Depth Model Of The Past 630 Kyr For Lake Ohrid (Fyrom/Albania) Based On Cyclostratigraphic Analysis Of Downhole Gamma Ray Data, Henrike Baumgarten, Thomas Wonik, D C. Tanner, Alexander Francke, Bernd Wagner, Giovanni Zanchetta, Roberto Sulpizio, Biagio Giaccio, Sebastien Nomade
Age-Depth Model Of The Past 630 Kyr For Lake Ohrid (Fyrom/Albania) Based On Cyclostratigraphic Analysis Of Downhole Gamma Ray Data, Henrike Baumgarten, Thomas Wonik, D C. Tanner, Alexander Francke, Bernd Wagner, Giovanni Zanchetta, Roberto Sulpizio, Biagio Giaccio, Sebastien Nomade
Faculty of Science, Medicine and Health - Papers: part A
Gamma ray (GR) fluctuations and potassium (K) values from downhole logging data obtained in the sediments of Lake Ohrid from 0 to 240 m below lake floor (b.l.f). correlate with fluctuations in δ18O values from the global benthic isotope stack LR04 (Lisiecki and Raymo, 2005). GR and K values are considered a reliable proxy to depict glacial-interglacial cycles, with high clastic input during cold and/or drier periods and high carbonate precipitation during warm and/or humid periods at Lake Ohrid. Spectral analysis was applied to investigate the climate signal and evolution over the length of the borehole. Linking downhole logging data …
Moss Δ13c: An Accurate Proxy For Past Water Environments In Polar Regions, Jessica Bramley-Alves, Wolfgang Wanek, Kris French, Sharon A. Robinson
Moss Δ13c: An Accurate Proxy For Past Water Environments In Polar Regions, Jessica Bramley-Alves, Wolfgang Wanek, Kris French, Sharon A. Robinson
Faculty of Science, Medicine and Health - Papers: part A
Increased aridity is of global concern. Polar regions provide an opportunity to monitor changes in bioavailable water free of local anthropogenic influences. However, sophisticated proxy measures are needed. We explored the possibility of using stable carbon isotopes in segments of moss as a fine-scale proxy for past bioavailable water. Variation in δ13C with water availability was measured in three species across three peninsulas in the Windmill Islands, East Antarctica and verified using controlled chamber experiments. The δ13C from Antarctic mosses accurately recorded long-term variations in water availability in the field, regardless of location, but significant disparities in δ13C between species …