Mt. Hunter, Alaska 1,200 Year Ice Core Accumulation Data Winski, D.A.; Osterberg, E.; Ferris, D.; Kreutz, K.J.; Wake, C.; Campbell, S.; Hawley, R.; Roy, S.; Birkel, S.; Introne, D.S.; Handley, M. Winski, D.A. Osterberg, E. Ferris, D. Kreutz, K.J. Wake, C. Campbell, S. Hawley, R. Roy, S. Birkel, S. Introne, D.S. Handley, M. earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter,annual,ice cores,null,null,N,meters of water equivalent) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter,Sep-Apr,ice cores,null,null,N,meters of water equivalent; Winter accumulation for a given year includes September-December of the previous year and January-April of the specified year) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter,May-Aug,ice cores,null,null,N,meters of water equivalent) earth science/paleoclimate/ice core (Mt. Hunter>LATITUDE 62.9333>LONGITUDE -151.0833) Future precipitation changes in a warming climate depend regionally upon the response of natural climate modes to anthropogenic forcing. North Pacific hydroclimate is dominated by the Aleutian Low, a semi-permanent wintertime feature characterized by frequent low-pressure conditions that is influenced by tropical Pacific Ocean temperatures through the Pacific-North American (PNA) teleconnection pattern. Instrumental records show a recent increase in coastal Alaskan precipitation and Aleutian Low intensification, but are of insufficient length to accurately assess low frequency trends and forcing mechanisms. Here we present a 1200-year seasonally- to annually-resolved ice core record of snow accumulation from Mt. Hunter in the Alaska Range developed using annual layer counting and four ice-flow thinning models. Under a wide range of glacier flow conditions and layer counting uncertainty, our record shows a doubling of precipitation since ~1840 CE, with recent values exceeding the variability observed over the past millennium. The precipitation increase is nearly synchronous with the warming of western tropical Pacific and Indian Ocean sea surface temperatures. While regional 20th Century warming may account for a portion of the observed precipitation increase on Mt. Hunter, the magnitude and seasonality of the precipitation change indicate a long-term strengthening of the Aleutian Low. STUDY NOTES: Reconstructed annual and seasonal snow accumulation data from the Mt. Hunter ice core. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Winski, D.A. Investigator : Osterberg, E. Investigator : Ferris, D. Investigator : Kreutz, K.J. Investigator : Wake, C. Investigator : Campbell, S. Investigator : Hawley, R. Investigator : Roy, S. Investigator : Birkel, S. Investigator : Introne, D.S. Investigator : Handley, M. 2017-12-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21970 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/denali/hunter2017accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/denali/hunter2017accum.txt English https://www.ncdc.noaa.gov/paleo/study/21970 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/denali/hunter2017accum.txt Dominic Winski, Erich Osterberg, David Ferris, Karl Kreutz, Cameron Wake, Seth Campbell, Robert Hawley, Samuel Roy, Sean Birkel, Douglas Introne, Michael Handley2017Industrial-age doubling of snow accumulation in the Alaska Range linked to tropical ocean warmingScientific Reports17869710.1038/s41598-017-18022-5https://www.nature.com/articles/s41598-017-18022-5 START YEAR: 810 AD * END YEAR: 2012 AD -151.0833 62.9333 -151.0833 62.9333