# Cook et al. 1997 Western US Drought Area Index Reconstruction #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), # and date accessed when using these downloaded data. If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/6226 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-recon-6226.json # Study_Level_JSON_Description: JSON metadata of this file's parent study, which includes all study metadata. # # Data_Type: Climate Reconstructions # # Dataset_DOI: # # Science_Keywords: Palmer Drought Index Reconstruction #------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/treering/reconstructions/dai_cook1997-noaa.txt # Data_Download_Description: NOAA Template File; PDSI Data # # Original_Source_URL: # Original_Source_Description: # #------------------- # Contribution_Date # Date: 1998-10-01 #------------------- # File_Last_Modified_Date # Date: 2022-03-31 #------------------- # Title # Study_Name: Cook et al. 1997 Western US Drought Area Index Reconstruction #------------------- # Investigators # Investigators: Cook, E.R.(https://orcid.org/0000-0001-7478-4176); Meko, D.M.; Stockton, C.W. #------------------- # Description_Notes_and_Keywords # Description: Drought(-) or Wetness(+) Area Index, defined as the the number of gridpoints (out of 154) that exceed PDSI thresholds, as defined in the Original Reference, for a given year. #------------------- # Publication # Authors: Cook, E.R., Meko, D.M. and Stockton, C.W. # Journal_Name: Journal of Climate # Published_Title: A new assessment of possible solar and lunar forcing of the bi-decadal drought rhythm in the western United States. # Published_Date_or_Year: 1997 # Volume: 10 # Issue: # Pages: 1343-1356 # Report_Number: # DOI: 10.1175/1520-0442(1997)010<1343:ANAOPS>2.0.CO;2 # Full_Citation: # Abstract: A new drought area index (DAI) for the United States has been developed based on a high-quality network of drought reconstructions from tree rings. This DAI is remarkably similar to one developed earlier based on much less data and shows strong evidence for a persistent bidecadal drought rhythm in the western United States since 1700. This rhythm has in the past been associated with possible forcing by the 22-yr Hale solar magnetic cycle and the 18.6-yr lunar nodal tidal cycle. The authors make a new assessment of these possible forcings on DAI using different methods of analysis. In so doing, they confirm most of the previous findings. In particular, there is a reasonably strong statistical association between the bidecadal drought area rhythm and years of Hale solar cycle minima and 18.6-yr lunar tidal maxima. The authors also show that the putative solar and lunar effects appear to be interacting to modulate the drought area rhythm, especially since 1800. These results do not eliminate the possibility that the drought area rhythm is, in fact, internally forced by coupled ocean–atmosphere processes. Recent modeling results suggest that unstable ocean–atmosphere interactions in the North Pacific could be responsible for the drought rhythm as well. However, the results presented here do not easily allow for the rejection of the solar and lunar forcing hypotheses either. #------------------- # Funding_Agency # Funding_Agency_Name: # Grant_Number: #------------------- # Site_Information # Site_Name: West and Central United States # Location: United States Of America # Northernmost_Latitude: 50 # Southernmost_Latitude: 26 # Easternmost_Longitude: -90 # Westernmost_Longitude: -125 # Elevation_m: #------------------- # Data_Collection # Collection_Name: PDSI_Cook1997 # First_Year: 1700 # Last_Year: 1978 # Time_Unit: CE # Core_Length_m: # Parameter_Keywords: reconstructions # Notes: #------------------- # Chronology_Information # Chronology: #------------------- # Variables # # PaST_Thesaurus_Download_Resource: https://www.ncdc.noaa.gov/paleo/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Variables format: shortname what,material,error,units,seasonality,data_type,detail,method, C(har) or N(umeric) data,additional information # ## age age,,,year Common Era,,climate reconstructions;tree ring,,,N, ## pdsi-0 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (-0) ## pdsi+0 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (+0) ## pdsi-1 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (-1) ## pdsi+1 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (+1) ## pdsi-2 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (-2) ## pdsi+2 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (+2) ## pdsi-3 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree ring,,regression analysis,N,grid cells exceeding PDSI threshold; calibration data set: local instrumental data; principal components regression, (-3) ## pdsi+3 Palmer Drought Severity Index,ring width,,count,Jun-Aug,climate reconstructions;tree 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