noaa-recon-19319 Sierra Nevada, California 500 Year Snowpack Reconstruction Belmecheri, S.; Babst, F.; Wahl, E.R.; Stahle, D.W.; Trouet, V. Sierra Nevada, California 500 Year Snowpack Reconstruction 2015-10-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19319 Investigator S. Belmecheri Investigator F. Babst Investigator E.R. Wahl Investigator D.W. Stahle Investigator V. Trouet earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring snow water equivalent,null,null,dimensionless,Apr,climate reconstructions|tree ring,null,null,N,first principal component earth science paleoclimate climate reconstructions|tree ring snow water equivalent,null,null,dimensionless,Apr,climate reconstructions|tree ring,null,null,N,first principal component; low elevation Sites <2129.8m earth science paleoclimate climate reconstructions|tree ring snow water equivalent,null,null,dimensionless,Apr,climate reconstructions|tree ring,null,null,N,first principal component; high elevation Sites >2669.2m earth science paleoclimate instrumental snow water equivalent,null,null,dimensionless,Apr,instrumental,null,null,N,first principal component; 1930-2015 earth science paleoclimate instrumental snow water equivalent,null,null,dimensionless,Apr,instrumental,null,null,N,first principal component; low elevation Sites <2129.8m; 1930-2015 earth science paleoclimate instrumental snow water equivalent,null,null,dimensionless,Apr,instrumental,null,null,N,first principal component; high elevation Sites >2669.2m; 1930-2015 earth science paleoclimate climate reconstructions|tree ring snow water equivalent,null,unspecified error upper bound,dimensionless,Apr,climate reconstructions|tree ring,null,null,N,first principal component earth science paleoclimate climate reconstructions|tree ring snow water equivalent,null,unspecified error lower bound,dimensionless,Apr,climate reconstructions|tree ring,null,null,N,first principal component earth science paleoclimate reconstructions precipitation geoscientificInformation Other Hydroclimate Reconstruction QUDG Quercus douglasii Hook. and Arn. blue oak 1500 AD 2015 AD 450 cal yr BP -65 cal yr BP Complete 36.57 41.583 -121.422 118.768 Continent North America United States Of America California Sierra Nevada>LATITUDE >LONGITUDE None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Soumaya Belmecheri, Flurin Babst, Eugene R. Wahl, David W. Stahle and Valerie Trouet 2015 Nature Climate Change 10.1038/nclimate2809 http://www.nature.com/nclimate/journal/vaop/ncurrent/full/nclimate2809.html

California is currently experiencing a record-setting drought that started in 2012 and recently culminated in the first ever mandatory state-wide water restriction. The snowpack conditions in the Sierra Nevada mountains present an ominous sign of the severity of this drought: the 1 April 2015 snow water equivalent (SWE) was at only 5% of its historical average. In the Mediterranean climate of California, with 80% of the precipitation occurring during winter months, Sierra Nevada snowpack plays a critical role in replenishing the state's water reservoirs and provides 30% of its water supply. As a result, a multi-year and severe snowpack decline can acutely impact human and natural systems, including urban and agricultural water supplies, hydroelectric power and wildfire risk. The exceptional character of the 2012-2015 drought has been revealed in millennium-length palaeoclimate records, but no long-term historical context is available for the recent snowpack decline. Here, we present an annually resolved reconstruction of 1 April SWE conditions over the whole Sierra Nevada range for the past 500 years. We combined an extensive compilation of blue oak tree-ring series that reflects large-scale California winter precipitation anomalies with a tree-ring-based California February-March temperature record in a reconstruction that explains 63% of the Sierra Nevada SWE variance over the instrumental period. STUDY NOTES: April 1st Snow Water Equivalent reconstruction using tree-rings and temperature reconstruction (1500-1980)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/california/sierra2015swe.txt Data File; Sierra Nevada 500 Year Snow Water Equivalent Reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11