Mount Mazama eruption: Calendrical age verified and atmospheric impact assessed

Research Article| July 01, 1999 Mount Mazama eruption: Calendrical age verified and atmospheric impact assessed C. M. Zdanowicz; C. M. Zdanowicz 1Climate Change Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA Search for other works by this author on: GSW Google Scholar G. A. Zielinski; G. A. Zielinski 1Climate Change Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA Search for other works by this author on: GSW Google Scholar M. S. Germani M. S. Germani 2Micromaterials Research Inc., Suite 200, 136 Shore Drive, Burr Ridge, Illinois 60521, USA Search for other works by this author on: GSW Google Scholar Author and Article Information C. M. Zdanowicz 1Climate Change Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA G. A. Zielinski 1Climate Change Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA M. S. Germani 2Micromaterials Research Inc., Suite 200, 136 Shore Drive, Burr Ridge, Illinois 60521, USA Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (7): 621–624. https://doi.org/10.1130/0091-7613(1999)0272.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation C. M. Zdanowicz, G. A. Zielinski, M. S. Germani; Mount Mazama eruption: Calendrical age verified and atmospheric impact assessed. Geology 1999;; 27 (7): 621–624. doi: https://doi.org/10.1130/0091-7613(1999)0272.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Geochemical identification of Mount Mazama ash in the Greenland Ice Sheet Project 2 (GISP2) ice core gives a calendrical age of 7627 ± 150 cal yr B.P. (5677 ± 150 B.C.) for the eruption, thus providing a more accurate early Holocene stratigraphic time line than previously available. The GISP2 record of volcanically derived sulfate suggests a total stratospheric aerosol loading between 88 and 224 Mt spread over an ∼6 yr period following the eruption of Mount Mazama. Taking into account the likelihood of some tropospheric aerosol transport to Greenland, realistic estimates of the resulting atmospheric optical depth range from 0.6 to 1.5. These values may have produced a temperature depression of ∼0.6 to 0.7 °C at mid to high northern latitudes for 1–3 yr after the eruption. These results indicate that the 5677 B.C. eruption of Mount Mazama was one of the most climatically significant volcanic events of the Holocene in the Northern Hemisphere. We also calculate a maximum stratospheric Cl− release of 8.1 Mt by the eruption, which may have led to substantial stratospheric ozone depletion. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.