noaa-recon-18295 California and Western Nevada Precipitation Reconstruction for 1571-1977 AD Diaz, H.F.; Wahl, E.R. California and Western Nevada Precipitation Reconstruction for 1571-1977 AD 2015-03-26 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18295 Investigator H.F. Diaz Investigator E.R. Wahl earth science paleoclimate climate reconstructions|tree ring precipitation,ring width,one root mean square error lower bound,inch,Oct-Sep,climate reconstructions|tree ring,null,principal component analysis|regression analysis,N,PC spatial regression 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 precipitation,ring width,one root mean square error upper bound,inch,Oct-Sep,climate reconstructions|tree ring,null,principal component analysis|regression analysis,N,PC spatial regression earth science paleoclimate climate reconstructions|tree ring precipitation,ring width,null,inch,Oct-Sep,climate reconstructions|tree ring,null,principal component analysis|regression analysis,N,PC spatial regression earth science paleoclimate climate reconstructions|tree ring latitude,null,null,degree north,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring longitude,null,null,degree east,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring precipitation,ring width,null,inch,Oct-Sep,climate reconstructions|tree ring,null,principal component analysis|regression analysis,N,principal components regression earth science paleoclimate reconstructions precipitation geoscientificInformation Precipitation Reconstruction drought 1571 AD 1977 AD 379 cal yr BP -27 cal yr BP Complete 32.5 42 -124.4 -116.5 Continent North America United States Of America California and western 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 Henry F. Diaz and Eugene R. Wahl 2015 Journal of Climate 28 12 4637-4652 10.1175/JCLI-D-14-00774.1 https://journals.ametsoc.org/doi/10.1175/JCLI-D-14-00774.1

An analysis of the October 2013–September 2014 precipitation in the western United States and in particular over the California-Nevada region suggests this anomalously dry season, while extreme, is not unprecedented in comparison with the ~120-year long instrumental record of water year (WY, October–September) totals, and in comparison with a 407-year WY precipitation reconstruction back to 1571. Over this longer period nine other years are known or estimated to have been nearly as dry or drier than WY 2014. The three-year deficit for WY's 2012-2014, which in California exceeded the annual mean precipitation, is more extreme but also not unprecedented, occurring three other times over the past ~ 440 years in the reconstruction. WY precipitation has also been deficient on average for the past 14 years, and such a run of predominantly dry WY’s is also a rare occurrence in our merged reconstructed plus instrumental period record. STUDY NOTES: Water year (October through following September) precipitation for California and western Nevada is reconstructed using existing western United States river flow reconstructions as predictor data. The full 0.5x0.5 degree gridded EV reconstruction for the entire continental United States (CONUS) west of 95 W from which the California and western Nevada reconstruction is extracted is included as a separate ASCII file (values are expressed as standardized anomalies). The rows of this file represent years AD (listed in the first column), starting with the third row; the rest of the columns provide the gridded reconstruction data, organized according to all longitudes for each latitude going from W to E. The first two rows (except for the 0 placeholder values in the first column) give the latitude (first row) and longitude (second row) information for each column.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/diaz2015/Main_Gridded_WY_Precip_Reconstruction.txt ASCII File; Full grid of reconstruction data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/diaz2015/diaz-wahl2015.txt Formatted Text File; California and western Nevada reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11