HadISD - global sub-daily station dataset -
final version 1.0.3.2014p
HadISD is a global sub-daily dataset based on
the ISD dataset
from NOAA's NCDC. As well as station
selection criteria, a suite of quality control tests has been run on
the major climatological variables. The data span 1/1/1973 to end
2013 and each station is available individually. The current
version of HadISD is 1.0.3.2014p. This is a preliminary
version to include data up to the end of 2014. It is likely that it will be updated in the near future. To return to the previous version (1.0.2.2013f), click here. For previous versions
please contact the dataset maintainers.
A station listing with IDs, names and location information is here.
Brief description of the data
Individual stations within the ISD were composited when
it was appropriate to do so. Then stations were selected on the basis of
their length of record and reporting frequency. These 6103 stations
were passed through a suite of automated quality control tests
designed to remove bad data while keeping the extremes. None of the
ISD flags were used. The QC tests focussed on the temperature,
dewpoint temperature and sea-level pressure variables, although some
were applied to the wind speed and direction and cloud data. The
data files also contain other variables which were pulled through from
the raw ISD record, but have had no QC applied. Some final filtering
was performed to select those stations which in our opinion are most
useful for climate studies. Note: These data have not
yet been homogenised and so trend fitting should be undertaken with caution.
Keep in touch
Follow us on twitter: @metofficeHadOBS for updates, news and announcements.
For more detailed information, follow our HadISD blog. Here we describe bug fixes, routine updates and other exploratory analysis.
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Commercial and media enquiries
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References
When using the dataset, please use the following two citations. Please also state the version of the dataset used.
Dunn, R. J. H., et
al. (2012), HadISD: A Quality Controlled global synoptic
report database for selected variables at long-term stations
from 1973-2011, Climate of the Past or PDF file (7MB)
Smith, A., et al. (2011): The Integrated Surface
Database: Recent Developments and
Partnerships. Bulletin
of the American Meteorological Society, 92, 704-708
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Quality Control Code
The IDL code used for the quality control and final filtering can be
found here. We do not intend to provide in-depth
support for this code. We emphasise that the choices we have made in
the QC and also the final filtering are one of a number of other
equally reasonable choices, and encourage other interested parties to
develop their own QC and filtering procedures to allow the structural
uncertainties of this sub-daily dataset to be investigated.
Online Material
A number of summary and diagnostic outputs from the quality control
code as well as station lists for a number of selection criteria are
available here. Also available is
the information from the homogeneity assessment of v1.0.3.2014p.
We have adapted our versioning system
from CRUTEM4,
and so the dataset numbering is of the form HadISD.X.Y.Z.1234i, and
is outlined in more detail in the paper linked above. X
is for a major change and would be accompanied by a peer-reviewed
paper. Y is a more minor change, e.g. in one of the QC tests and
would be described in a tech-note. Finally Z is
a small change, for example addition or changes to data in the
past. The last complete year of the dataset is given by 1234, and
the final character shows if the dataset is f-final or
p-preliminary. Therefore HadISD.1.0.1.2012f is the final version of
the dataset containing data up to the end of 2012, and there have
been some changes to past data over HadISD.1.0.0.2011f.
NEW: A number of images and movies created from HadISD to show its
capabilities are here.
Dataset produced in collaboration with:
