US West Coast 500 Year Gridded Standardized Precipitation Index Reconstruction Wise, E.K. Wise, E.K. Precipitation Reconstruction 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 (standardized precipitation index,null,correlation coefficient,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,Pearson correlation coefficient (R) between the predicted and observed data) earth science/paleoclimate/climate reconstructions|tree ring (standardized precipitation index,null,verification coefficient of efficiency,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (standardized precipitation index,null,bias,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (standardized precipitation index,null,null,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (standardized precipitation index,null,verification root mean square error,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (standardized precipitation index,null,null,null,null,climate reconstructions|tree ring,null,null,N,null) 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 (p-value,null,null,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,p-values associated with correlation coefficients) earth science/paleoclimate/climate reconstructions|tree ring (standardized precipitation index,null,null,dimensionless,Oct-Mar,climate reconstructions|tree ring,null,null,N,standard deviation ratio (SDR)) earth science/paleoclimate/reconstructions (US West Coast>LATITUDE >LONGITUDE ) The U.S. West Coast drought commencing in 2012 developed in association with a large, persistent high-pressure ridge linked to internal atmospheric variability. This study places the occurrence, spatial patterns, and associated circulation features of West Coast drought into a paleoclimate context through a synoptic dendroclimatology approach linking atmospheric circulation to surface hydroclimate patterns. Spatial reconstructions of upper-atmosphere pressure patterns and cool-season drought show that West Coast-wide drought, although relatively rare compared to north-south dipole drought, has occurred periodically since 1500 CE and is consistently associated with a strong ridge centered along the Pacific Northwest coast. Atmospheric blocking is also linked to north-dry dipole droughts, while south-dry and wider Western droughts indicate La Niña-type patterns. The transition latitude between the northern and southern sides of the western precipitation dipole, important for California hydroclimate patterns, has had frequent year-to-year fluctuations but remained centered on 40°N over the past five centuries. STUDY NOTES: Tree-ring based, gridded (0.5°x0.5°) cool-season (Oct-Mar) Standardized Precipitation Index (SPI) reconstruction for the US West Coast 1500-2013 CE. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Wise, E.K. 2016-04-22 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20062 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi-readme.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi.nc https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi-readme.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi.nc https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi.txt English https://www.ncdc.noaa.gov/paleo/study/20062 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi-readme.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi.nc https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/wise2016spi.txt Erika K. Wise2016Five centuries of U.S. West Coast drought: Occurrence, spatial distribution, and associated atmospheric circulation patternsGeophysical Research Letters4310.1002/2016GL068487http://onlinelibrary.wiley.com/doi/10.1002/2016GL068487/full START YEAR: 1500 AD * END YEAR: 2013 AD -125 32 -114 49