Last updated: 28 May 2020 Please note that these data are provided under the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) licence. Please make sure that you are aware of the terms and conditions of this licence before using the data. Under the terms of this licence, the acknowledgement that you are required to make is: We would like to thank Bodeker Scientific, funded by the New Zealand Deep South National Science Challenge, for providing the combined NIWA-BS total column ozone database. If you are going to be using this database in a publication, please let Greg Bodeker know (greg@bodekerscientific.com). Version 3.4 the National Institute of Water and Atmospheric Research - Bodeker Scientific (NIWA-BS) total column ozone database is available. Version 3.4 of the NIWA-BS total column ozone (TCO) database is now available through a project funded by the New Zealand Deep South National Science Challenge. This version of the database improves on Version 3.3 by improving the screening of the raw satellite data and removing anomalous data prior to their use in the process that splices together the different data sets. As with previous versions, the database is constructed by combining measurements from a number of different satellite-based instruments and extends from 1 November 1978 to 31 December 2016. Offsets and drifts between the different data sets are resolved through comparisons with the Dobson and Brewer ground-based instruments and through inter-satellite instrument comparisons. Version 3.4 of the database is available here and a paper describing the new database is in preparation for submission to Earth System Science Data. The structure of the data available on the FTP server is as follows: Count fields, which detail the number of satellite measurements available in each grid cell, are only available for the daily-unpatched grids.Calculating the monthly means and their uncertainties The uncertainties on the annual means are calculated using the same formulae. This approach has been validated through Monte Carlo testing/ Calculating filled fields A complete description of how the filled fields (also called 'patched' fields), and their uncertainties, are calculated is provided here. Accessing the data If you would like access to these data, or to be kept informed of updates to the database, please email Greg Bodeker at greg@bodekerscientific.com. A paper is in the process of being written to describe this new database. Descriptions of previous versions of the data set are available in a number of publications that have made use of the data:
Changelog Version 3.3 (October 2017): This update to previous versions of the database included:
Version 3.2 (January 2017): Updated the V3.0 methodology to more robustly model the difference fields between data sets at the poles. A patched data set was also providedVersion 3.0 (November 2015): Version 3.0 of the NIWA-BS total column ozone (TCO) database has been constructed in a project funded by the New Zealand Deep South National Science Challenge. The database is constructed by combining measurements from a number of different satellite-based instruments. Offsets and drifts between the different data sets are resolved through comparisons with the Dobson and Brewer ground-based instruments and through inter-satellite instrument comparisons. This update to previous versions of the database includes:
At this time only daily 'unpatched' data are available. We are working on generating monthly mean and patched data files as had been available in previous versions of the database. This is now a little more challenging as we intend to capitalize on the uncertainty estimates being available to calculate monthly means and patched data that incorporate realistic uncertainties. If you need the monthly mean or patched data, please continue to use version 2.8 of the database for now (see below). Version 2.8: Version 2.8 of the total column ozone database made the following changes to previous versions:
On the FTP server for version 2.8 of this database you will see three different directories, viz.:
Daily: These are the data at daily resolution. There are, in turn, three subdirectories, viz.:
Locations: These are daily data extracted from the daily resolution grid files using bilinear interpolation. Each file is a text file and contains a header describing the file contents. The values in the last column describe the extent of the interpolation required to derive a valid value. If a valid value was available from the 'Unpatched' daily grid files, this value will be 0. If it was necessary to go to the 'LongPatched' daily grid files, this value will be 1. If it was necessary to go to the 'Patched' daily grid files this value will be 2. If no value could be derived, this value will be -1000. If a location that you want data for is not currently available, please email me at greg@bodekerscientific.com with the name, latitude and longitude of the station you want data for, and I will see what I can do. Monthly: These are data at monthly resolution. There have to be at least 25 valid values within a month to calculate a valid monthly mean. As with the daily data, there are three subdirectories containing data in which different degrees of spatial and/or temporal interpolation has been applied. Read the explanatory notes in the daily data section to see what these are. They are available both as NetCDF and as text files.
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