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Late Holocene forest dynamics, volcanism, and climate change at Whitewing Mountain and San Joaquin Ridge, Mono County, Sierra Nevada, CA, USA |
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| Authors: | Constance I Millar John C King Harry A Alden |
| Institution: | a USDA Forest Service, Sierra Nevada Research Center, Pacific Southwest Research Station, Berkeley, CA 94701, USA b Lone Pine Research, Bozeman, MT 59715, USA c Smithsonian Institution, Center for Materials Research and Education, Suitland, MD 20746, USA |
| Abstract: | Deadwood tree stems scattered above treeline on tephra-covered slopes of Whitewing Mtn (3051 m) and San Joaquin Ridge (3122 m) show evidence of being killed in an eruption from adjacent Glass Creek Vent, Inyo Craters. Using tree-ring methods, we dated deadwood to AD 815-1350 and infer from death dates that the eruption occurred in late summer AD 1350. Based on wood anatomy, we identified deadwood species as Pinus albicaulis, P. monticola, P. lambertiana, P. contorta, P. jeffreyi, and Tsuga mertensiana. Only P. albicaulis grows at these elevations currently; P. lambertiana is not locally native. Using contemporary distributions of the species, we modeled paleoclimate during the time of sympatry to be significantly warmer (+3.2°C annual minimum temperature) and slightly drier (−24 mm annual precipitation) than present, resembling values projected for California in the next 70-100 yr. |
| Keywords: | Paleoecology Medieval climate Late Holocene Climate change Long Valley volcanism Inyo Craters Forest history Paleoclimatic modeling Tree-ring dating |
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