noaa-recon-24230 Global 2,000 Year Paleo Hydrodynamics Data Assimilation product (PHYDA) Steiger, N.J.; Smerdon, J.E.; Cook, E.R.; Cook, B.I. Global 2,000 Year Paleo Hydrodynamics Data Assimilation product (PHYDA) 2018-05-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24230 Investigator N.J. Steiger Investigator J.E. Smerdon Investigator E.R. Cook Investigator B.I. Cook earth science paleoclimate reconstructions atmospheric circulation earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction Atmospheric and Oceanic Circulation Patterns Reconstruction Palmer Drought Index Reconstruction 0 AD 2000 AD 1950 cal yr BP -50 cal yr BP Complete -90 90 -180 180 Geographic Region Global Global>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 Nathan J. Steiger, Jason E. Smerdon, Edward R. Cook, Benjamin I. Cook 2018 Scientific Data 180086 5 10.1038/sdata.2018.86 https://www.nature.com/articles/sdata201886

Hydroclimate extremes critically affect human and natural systems, but there remain many unanswered questions about their causes and how to interpret their dynamics in the past and in climate change projections. These uncertainties are due, in part, to the lack of long-term, spatially resolved hydroclimate reconstructions and information on the underlying physical drivers for many regions. Here we present the first global reconstructions of hydroclimate and associated climate dynamical variables over the past two thousand years. We use a data assimilation approach tailored to reconstruct hydroclimate that optimally combines 2,978 paleoclimate proxy-data time series with the physical constraints of an atmosphere-ocean climate model. The global reconstructions are annually or seasonally resolved and include two spatiotemporal drought indices, near-surface air temperature, an index of North Atlantic variability, the location of the intertropical convergence zone, and monthly Nino indices. This database, called the Paleo Hydrodynamics Data Assimilation product (PHYDA), will provide a critical new platform for investigating the causes of past climate variability and extremes, while informing interpretations of future hydroclimate projections. STUDY NOTES: Paleohydrodynamic proxy data set and global hydroclimate reconstructions for the past 2,000 years. Included are reconstructions of three global variables gridded at ~2 degree resolution: surface temperature at 2m, the Palmer drought severity index (PDSI), and the standardized precipitation evapotranspiration index (SPEI). Also reconstructed are climate indices at annual, JJA, and DJF temporal resolutions: the global mean temperature, the North Atlantic sea surface temperature index (which is the non-detrended and non-smoothed version of the Atlantic multidecadal oscillation index (AMO), and the location of the intertropical convergence zone (ITCZ) in 11 longitudinal zones. Also reconstructed are the monthly Nino sea surface temperature (SST) indices (Nino 1+2, 3, 3.4, 4) and the monthly equatorial Pacific zonal SST gradient.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/steiger2018/readme-steiger2018.txt Data Description; Paleo Hydrodynamics Data Assimilation product (PHYDA) Readme File GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/steiger2018/ Data Folder; Paleo Hydrodynamics Data Assimilation product (PHYDA) Data Files USA/NOAA DIF Version 9.8.4 2019-05-17 2019-05-17