This 20CRplus_readme.txt file was generated on 20231010 by Stefan Brönnimann ------------------- GENERAL INFORMATION ------------------- 1. Title of dataset: Daily temperature and sea-level pressure fields for the Southern Hemisphere 1901-1930 2. Contributor information: Name: Stefan Brönnimann Role/Function: Data provider Institution: Institute of Geography, University of Bern Address: Hallerstr. 12, CH-3012 Bern Email: stefan.broennimann@unibe.ch 3. Date of data collection: 2023-10-10 4. Geographic location of data collection: Southern Hemisphere 5. Keywords describing the subject of your dataset: Atmospheric data, reanalysis, data assimilation, southern ocean 6. Information about funding sources that supported the collection of the data: Funding agency name: Newton Fund, Weather Climate Science for Service Partnership (WCSSP) South Africa Grant number: WCSSP SA22_1.3 ------------------- SHARING/ACCESS INFORMATION ------------------- 1. Licenses/restrictions placed on the data: CC-BY 2. Links to publications that cite or use the data: 3. Links to other publicly accessible locations of the data: 4. Links/relationships to additional data sets: 5. Was data derived from another source? yes/no. Yes, the Twentieth Century Reanalysis version 3. 6. Recommended citation for this dataset: Brönnimann, S. (2023) Daily temperature and sea-level pressure fields for the Southern Hemisphere 1901-1930. BORIS Portal, https://doi.org/10.48620/371. Brönnimann, S., Y. Brugnara, and C. Wilkinson (2023) Early Twentieth Century Southern Hemisphere Cooling. Climate of the Past (submitted). --------------------- DATA & FILE OVERVIEW --------------------- 1. File List: Filename: 20CRv3plus_SH_1901_1915_SLP_mean.zip File format: zip file of netcdf4 files Short description: Gridded daily sea-level pressure (12Z) in the Southern Hemisphere, ensemble mean of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_SLP.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1916_1930_SLP_mean.zip File format: zip file of netcdf4 files Short description: Gridded daily sea-level pressure (12Z) in the Southern Hemisphere, ensemble mean of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_SLP.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1901_1915_T2M_mean.zip File format: zip file of netcdf4 files Short description: Gridded daily air temperature at 2 m (12Z) in the Southern Hemisphere, ensemble mean of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_T2M.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1916_1930_T2M_mean.zip File format: zip file of netcdf4 files Short description: Gridded daily air temperature at 2 m (12Z) in the Southern Hemisphere, ensemble mean of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_T2M.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1901_1915_SLP_spread.zip File format: zip file of netcdf4 files Short description: Gridded daily sea-level pressure (12Z) in the Southern Hemisphere, ensemble standard deviation of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_SLP_spread.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1916_1930_SLP_spread.zip File format: zip file of netcdf4 files Short description: Gridded daily sea-level pressure (12Z) in the Southern Hemisphere, ensemble standard deviation of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_SLP_spread.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1901_1915_T2M_spread.zip File format: zip file of netcdf4 files Short description: Gridded daily air temperature at 2 m (12Z) in the Southern Hemisphere, ensemble standard deviation of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_T2M_spread.nc) Date of creation: 20231010 Filename: 20CRv3plus_SH_1916_1930_T2M_spread.zip File format: zip file of netcdf4 files Short description: Gridded daily air temperature at 2 m (12Z) in the Southern Hemisphere, ensemble standard deviation of 80 members, one file per year YYYY (file name: 20CRv3augmented_ship_landpt_YYYY_T2M_spread.nc) Date of creation: 20231010 Filename: 20CRv3plus_observations.zip File format: zip file of txt files Short description: contains the following txt files filelst.wcssp.txt: list of files with ship observations filelst.land.txt: list of files with land observations (temperature) filelst.land.p.txt: list of files with land observations (pressure) coor.land.txt: Coordinates of the land stations (temperature) coor.land.p.txt: Coordinates of the land stations (pressure) Melbourne.txt (temperature in °C) KentTown.txt (temperature in °C) Sydney.txt (temperature in °C) Rocha.txt (temperature in °C) CapeTown.txt (temperature in °C) CapeTownP.txt (pressure in hPa) Athenic.txt (ship data incuding sea-level pressure in hPa) Corinthic.txt (ship data incuding sea-level pressure in hPa) Ionic.txt (ship data incuding sea-level pressure in hPa) Kaipara.txt (ship data incuding sea-level pressure in hPa) Kumara.txt (ship data incuding sea-level pressure in hPa) Paparoa.txt (ship data incuding sea-level pressure in hPa) Rimutaka.txt (ship data incuding sea-level pressure in hPa) Ruapehu.txt (ship data incuding sea-level pressure in hPa) TerraNova.txt (ship data incuding sea-level pressure in hPa) Tongariro.txt (ship data incuding sea-level pressure in hPa) Turakina.txt (ship data incuding sea-level pressure in hPa) Waimate.txt (ship data incuding sea-level pressure in hPa) Waiwera.txt (ship data incuding sea-level pressure in hPa) Date of creation: 20231010 Filename: 20CRplus_1901_1930.R File format: R code to generate the data set Short description: R-code to generate the data set from the provided input files plus 20CRv3 (can be ontained from NCAR) Date of creation: 20231010 2. Relationship between files: 3. Are there multiple versions of the dataset? no -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: The date were generated from updating 20CRv3 with additional observations using an off-line Kalman filter. The method is described in Brönnimann, S. (2022) Historical Observations for Improving Reanalyses. Front. Clim. 4, 880473, doi: 10.3389/fclim.2022.880473 The data set is further desribed in Brönnimann, S., Y. Brugnara, and C. Wilkinson (2023) Early Twentieth Century Southern Hemisphere Cooling. Climate of the Past (submitted). 2. Methods for processing the data: 3. Instrument- or software-specific information needed to interpret the data: 4. Standards and calibration information: 5. Environmental/experimental conditions: 6. Describe any quality-assurance procedures performed on the data: 7. People involved with sample collection, processing, analysis and/or submission: ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: [FILENAME] ----------------------------------------- 1. Number of variables: 2. Number of cases/rows: 3. Variable List 4. Missing data codes: 5. Specialized formats of other abbreviations used