Met Office - Globally gridded radiosonde temperature anomalies (1958 to present) - HadAT

General Info

Title:	Met Office - Globally gridded radiosonde temperature anomalies (1958 to present) - HadAT
Type:	Data Entity
Sub-Type:	Analysis
Abbreviation:	Met Office - HadAT
Publication State:	published
The publication state of this metadata: 'old' - for redundant records; 'working' - for new/in progress records; 'published' - for records approaching maturity, which may still change, but should be available via the discovery services; and 'Published' for mature records that are unlikely to change and should be available via the discovery services.

URI:	http://badc.nerc.ac.uk/view/badc.nerc.ac.uk__ATOM__dataent_hadat

Summary
A brief description of the data.

The HadAT data are global radiosonde gridded temperature anomalies at standard levels in the troposphere and in the lower stratosphere from 1958 to present. This dataset supersedes the HadRT dataset. All values are anomalies relative to the monthly 1966-95 climatology.

Content
The actual data being described by this document. NB, in the case of data granules, this content may just be a reference to an ingested CSML or CDML file.

Introduction

HadAT is the Hadley Centre's new radiosonde temperature product. It supersedes HadRT which will continue to be made available in parallel for a short while.

HadAT2 is the recommended version of the Hadley Centre's gridded radiosonde temperature product. It is a monthly timeseries available on a 10 degree longitude by 5 degree latitude basis. Data are available on nine separate pressure levels (850, 700, 500, 300, 200, 150, 100, 50, and 30hPa). All values are anomalies relative to the monthly 1966-95 climatology.

Zonal averages were created by averaging all available gridbox values in each 5 degree latitude band. Large scale mean timeseries for the globe and the tropics (defined here as 20N to 20S) are simply cos(lat) weighted zonal mean field values. This reduces the spatial sampling bias towards Northern Hemisphere mid-latitudes. Other plausible large-scale averaging techniques would impact the timeseries values calculated.

Data are updated every quarter with, typically, a two-month lag so that, for example, January data are typically available in late March / early April. This should be suitable for the majority of users.

Access Restrictions

The Met Office wish to monitor the use of this data and require an acknowledgement of the data source if they are used in any publication. The online application for access to the Met Office HadAT data includes acceptance of the Met Office Conditions of Use. Please note that the Met Office data sets are available for bona fide academic research only (sorry no undergraduates), on a per person per project basis (i.e. all members on a same project who will be using the data must individually apply for access to the data). If you wish to access the Met Office data for commercial or personal purposes, please contact the Met Office Hadley Centre directly.

Your application for accessing the HadAT data will be processed within a day of receipt and you will receive a confirmation email. Provided your application is complete and fully meets the Met Office conditions, a web account will be activated to allow you access to the HadAT data directories via your login account from the BADC WWW Browse Archive pages.

Data file format

The data held at the BADC, are stored in a simple ASCII format (plain text and "human" readable) and also in NetCDF.

Documentation, Links to further information and references

More details on the construction of the dataset are given in the audit page. Details of the uncertainty analysis (at present applied only to seasonal timeseries and frozen to 2002) are available. Some typically used diagrams are also available and may be sufficient for many users requirements.

The Met Office Hadley Centre for Climate Change observational datasets site www.hadobs.org.

When using HadAT, the correct citation is:

Thorne, P.W, Parker, D.E., Tett, S.F.B., Jones, P.D., McCarthy, M., Coleman, H., and Brohan, P., 2005, Revisiting radiosonde upper-air temperatures from 1958 to 2002.Accepted by Journal of Geophysical research

Other references: The following papers provide useful information on HadAT or other related radiosonde datasets and are strongly recommended to be read to provide background for proper use and analysis of HadAT.

Coleman, H. and Thorne, P.W., 2005, HadAT: An update to 2005 and development of the dataset website., Internal report for DEFRA
Parker, D.E, Gordon, M., Cullum, D.P.N., Sexton, D.M.H., Folland, C.K., and Rayner, N., 1997, A new Gridded Radiosonde Temperature Data Base and Recent Temperature Trends. Geophys. Res. Letters,24, 1499-1503.
Lanzante, J.R., Klein, S.A., and Seidel, D.J., 2003, Temporal homogenization of monthly radiosonde temperature data. Part I: Methodology.J. Clim.,16, 224-240.
Lanzante, J.R., Klein, S.A., and Seidel, D.J., 2003, Temporal homogenization of monthly radiosonde temperature data. Part II: Trends, sensitivities, and MSU comparison.J.Clim.,16, 241-262.

Citation

Date of citation,

Who to contact

If you have queries about these pages or about obtaining the Met Office HadAT data from the BADC then you should contact BADC Support. Your query should be answered within one working day. When follow-up work is required, the BADC support will carry out the work as quickly and efficiently as possible, and in any case, the user will be kept informed of progress.

Lineage
Summary of the origins of the dataset, e.g.: "Dataset produced from NASA MODIS instrument on Terra and collected at the University of York's groundstation 1999-2003 and a copy provided to NEODC in June 2007".

Data files acquired as is from the Met Office Hadley centre.

Quality Statement
Description of the relative quality of the dataset.

Data quality controlled by the Met Office (as per dataset documentation provided).

Author
The principal author of the actual underlying data. Only one author can be specified per atom; if there are multiple authors, these should be specified as 'contributors'. NB, an atom MUST have an author specified.

Name	email
Met Office Hadley Centre

Online References
Online references with a specific relationship to the data being described here. NB, if links are supplied they must be valid and include the transport protocol - e.g. 'http://blah.co.uk'. Also, note, three online references can be added at once; after these are added a further three may be specified - and so on.

Relation	Title
Download	Met Office HadAT Data Directory
Documentation	BADC Doc: Summary of HadAT development
Documentation	BADC Doc: HadAT Uncertainty estimates
Apply for access	Apply for access to HadAT
Logo	Met Office Logo

Parent Data Entity
Define the parent of this record. There should probably only be one parent, but this is not enforced.

No data specified at present

Sub Data Entities
Lists all entities which have the current entity as their parent.

None

Associated Deployments

Parameters - summary

VERTICALPROFILEOFAIRTEMPERATURE	AIRTEMPERATURE	ATMOSPHERICTEMPERATURE	ATMOSPHERE
EARTH SCIENCE	NULL	TEMPERATUREANOMALIES

Parameters - details
Parameters to describe the data - with vocab URL and term IDs for further classification. Note, three parameters can be added at once; after these are added a further three may be specified - and so on.

Label	Vocab Term URL	Vocab Term ID
VERTICALPROFILEOFAIRTEMPERATURE	http://vocab.ndg.nerc.ac.uk/term/null	NULL
AIRTEMPERATURE	http://vocab.ndg.nerc.ac.uk/term/null	NULL
ATMOSPHERICTEMPERATURE	http://vocab.ndg.nerc.ac.uk/term/P141	NULL
ATMOSPHERE	http://vocab.ndg.nerc.ac.uk/term/P131	NULL
EARTH SCIENCE	http://vocab.ndg.nerc.ac.uk/term/P111	GCAT0001
NULL	general_units	0
TEMPERATUREANOMALIES	http://vocab.ndg.nerc.ac.uk/term/null	NULL

Data Coverage
Summary of the temporal and spatial data coverage for the data.

Spatial coverage
Max Y: 90.0
Min X: -180.0	Max X 180.0
Min Y -90.0

Temporal coverage
Start Date:	1958-01-01
End Date:

Spatial resolution

No spatial resoultion information available.

Vertical extent

No vertical extent information available.

Responsible Parties
Parties responsible for the metadata - e.g. data curator. Responsible parties can have a role specified to make their function clearer. Multiple responsible parties can be specified.

Role	Name	URI
Data Curator	badc.nerc.ac.uk	http://badc.nerc.ac.uk

Other Info
Other miscellaneous information. Note, update frequency relates to the update frequency of the underlying data, not the metadata.

Dataset language

English

Update frequency

quarterly

Links and Services
	Downloadable XML version of this record

Not all information in this record may be rendered in this view. Please see the XML version for complete content

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