This README.txt file was generated on <2021/11/15> by ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset: Data for "Relic Groundwater and Mega Drought Confound Interpretations of Water Sustainability and Lithium Extraction in Arid Lands" 2. Author Information First Author Contact Information Name: Brendan J. Moran Institution: University of Massachusetts Amherst Address: Department of Geosciences, 233 Morrill Science Center, University of Massachusetts, 627 North Pleasant St, Amherst, MA 01003-9297 Email: bmoran@umass.edu --------------------- DATA & FILE OVERVIEW --------------------- Directory of Files A. Filename: TerraClimate_SdA Basin_Total Annual P.csv Short description: Annual precipitation totals from the TerraClimate dataset for the SdA Basin B. Filename: TerraClimate_SdA Basin_Monthly P Series.csv Short description: Monthly precipitation totals from the TerraClimate dataset for the SdA Basin C. Filename: JRC Surface Water Extent_SdA Basin_Pools Masked_1985 2020.csv Short description: Average monthly surface water area extent for the SdA Basin from the JRC dataset with the artificial mining evaportation ponds masked out of ROI D. Filename: Landsat 5-7_SdA Basin_Compiled NDVI Vegetated Area.csv Short description: Total vegetated area for the SdA Basin per Landsat satellite pass with complete data record (~every 16 days) E. Filename: TimeSeries.water_equivalent_thickness_land_(grace,_gracefo_jpl).csv Short description: Terrestrial water storage anomaly equivalent thickness (~monthly) in the SdA Basin measured by GRACE satellite pair, processed by the Jet Propulsion Laboratory F. Filename: TimeSeries.water_equivalent_thickness_land_(grace,_gracefo_csr).csv Short description: Terrestrial water storage anomaly equivalent thickness (~monthly) in the SdA Basin measured by GRACE satellite pair, processed by the Center for Space Research G. Filename: SdA_Gw Levels_Yield Zones.csv Short description: Groundwater elevation data records in the SdA Basin H. Filename: Table S1.csv Short description: Hydrogeochemical data and results presented in Section 4.3 (Table included in Supplemental Information) I. Filename: Table S2.csv Short description: Physical model calculations and results presented in Section 4.3 (Table included in Supplemental Information) # # Data Description: A data description, dictionary, or codebook # defines the variables and abbreviations used in a dataset. This # information can be included in the README file, in a separate # file, or as part of the data file. If it is in a separate file # or in the data file, explain where this information is located # and ensure that it is accessible without specialized software. # (We recommend using plain text files or tabular plain text CSV # files exported from spreadsheet software.) # ----------------------------------------- DATA DESCRIPTION FOR: [TerraClimate_SdA Basin_Total Annual P.csv] ----------------------------------------- 1. Number of variables: 2 2. Number of cases/rows: 63 3. Missing data codes: No missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: Year Description: Year (yyyy) B. Name: mm Description: Millimeters of precipitation ----------------------------------------- DATA DESCRIPTION FOR: [TerraClimate_SdA Basin_Monthly P Series.csv] ----------------------------------------- 1. Number of variables: 2 2. Number of cases/rows: 756 3. Missing data codes: No Missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: Date Description: Date (mm/dd/yyyy) B. Name: mm Description: Millimeters of precipitation ----------------------------------------- DATA DESCRIPTION FOR: [JRC Surface Water Extent_SdA Basin_Pools Masked_1985 2020.csv] ----------------------------------------- 1. Number of variables: 2 2. Number of cases/rows: 432 3. Missing data codes: No Missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: Date Description: Date (mm/dd/yyyy) B. Name: Area (km2) Description: Average area of surface water extent in square kilometers ----------------------------------------- DATA DESCRIPTION FOR: [Landsat 5-7_SdA Basin_Compiled NDVI Vegetated Area.csv ] ----------------------------------------- 1. Number of variables: 2 2. Number of cases/rows: 607 3. Missing data codes: No Missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: Date Description: Date (mm/dd/yyyy) B. Name: Vegetated Area (km2) Description: Measured area of vegetation extent in square kilometers at each date instance ----------------------------------------- DATA DESCRIPTION FOR: [TimeSeries.water_equivalent_thickness_–_land_(grace,_grace-fo_jpl).csv] ----------------------------------------- 1. Number of variables: 2 2. Number of cases/rows: 193 3. Missing data codes: No Missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: DateTime Description: Date (mm/dd/yyyy) B. Name: Water Equivalent Thickness – Land (GRACE, GRACE-FO JPL) (cm) Description: Terrestrial Water Storage Anomaly over the SdA Basin in centimeters ----------------------------------------- DATA DESCRIPTION FOR: [TimeSeries.water_equivalent_thickness_–_land_(grace,_grace-fo_csr).csv] ----------------------------------------- 1. Number of variables: 2 2. Number of cases/rows: 193 3. Missing data codes: No Missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: DateTime Description: Date (mm/dd/yyyy) B. Name: Water Equivalent Thickness – Land (GRACE, GRACE-FO CSR) (cm) Description: Terrestrial Water Storage Anomaly over the SdA Basin in centimeters ----------------------------------------- DATA DESCRIPTION FOR: [SdA_Gw Levels_Yield Zones.csv] ----------------------------------------- 1. Number of variables: 4 2. Number of cases/rows: 13878 3. Missing data codes: No Missing data Code/symbol Definition Code/symbol Definition 4. Variable List A. Name: Well Name Description: Name of well B. Name: Date Description: Date (mm/dd/yyyy) C. Name: Groundwater Elevation (masl) Description: Measured elevation of water table in meters above sea level D. Name: Yeild Zone Description: The location of the well among SdA Basin yield zones (defined in text and Figure 4) ----------------------------------------- DATA DESCRIPTION FOR: [Table S1.csv] ----------------------------------------- 1. Number of variables: 15 2. Number of cases/rows: 114 3. Missing data codes: "-" Code/symbol: "-" Definition: No Data available 4. Variable List A. Name: Sample ID Description: Sample ID B. Name: Sample Name Description: Name of Sample C. Name: Water Type Description: Water type classification D. Name: Collection Date Description: Date of sample collection (mm/dd/yyyy) E. Name: Latitude (deg N) Description: Latitude coordinate of sample in WGS F. Name: Longitude (deg W) Description: Longitude coordinate of sample in WGS G. Name: Elevation (masl) Description: Elevation of sample in meters above sea level H. Name: SC (µS/cm) Description: Specific Conductivity of water measured in the field I. Name: 3H (TU) Description: Tritum activity of sample measured in the sample in Tritium Units J. Name: 1 sigma error Description: Error associated with tritum activity measurment - 1 sigma (analytical) K. Name: Percent Modern Description: Calculated value of percent modern water in sample L. Name: H2O-d18O (‰) Description: Oxygen (δ18O) isotopic composition in sample M. Name: H2O-d2H (‰) Description: Hydrogen (δ2H) isotopic composition in sample N. Name: d-excess (‰) Description: Deuterium-excess of sampled water O. Cl- (mg/l) Description: Concentration of Chloride ions in sample ----------------------------------------- DATA DESCRIPTION FOR: [Table S2.csv] ----------------------------------------- 1. Number of variables: 13 2. Number of cases/rows: 50 3. Missing data codes: " Code/symbol " Definition: Repeated data from above sample sets 4. Variable List A. Name: Sample Site (ID) Description: Sample name and ID B. Name: Elevation (masl) Description: Elevation of sample in meters above sea level C. Name: Lateral distance to recharge area (m) Description: Lateral distance to recharge area from sample point in meters D. Name: Elevation of recharge area (masl) Description: Elevation of reachrge area in meters above sea level E. Name: Gradient (dh/dl) Description: Gadient between racharge area and sample (-) F. Name: v (m/d) Description: Calculated seepage velocity based on a range of hydraulic conductivities (15.5, 10, 5 m/d) G. Name: Distance from recharge area (m) Description: Distance to recharge area from sample point along the ground surface in meters H. Name: Predicited transit time (years) Description: Model predicted transit time in years I. Name: Measured 3H (TU) Description: Tritum activity of sample measured in the sample in Tritium Units J. Name: Measured % Modern Description: Value of percent modern water in sample from Table S1 K. Name: Predicted 3H (TU) Description: Model predicted tritum activity at sample site (without end member mixing) L. Name: Modelled Value (TU) Description: Tritium activity in water estimated by model at sample point (with end member mixing) M. Name: Modelled Modern Content Description: Precent modern content of water estimated by model at sample point