Met Office - HadISST 1.1 - Global sea-Ice coverage and SST (1870-Present)

General Info

Title:	Met Office - HadISST 1.1 - Global sea-Ice coverage and SST (1870-Present)
Type:	Data Entity
Sub-Type:	Analysis
Abbreviation:	Met Office - HadISST
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_hadisst

Summary
A brief description of the data.

Data from HasISST contains measurements of sea surface temperature (SST) and also global sea ice coverage (HadISST1.1). Dataset include monthly mean gridded, global SSTs from 1870 to present and Sea Ice coverage from 1870 to present. This is a new data product replacing the GISST/GICE data sets ended in February 2003. The data are provided by the Hadley centre (Met Office).

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.

LATEST NEWS:

21-MAR-2012 - CEDA WPS facility now available to extract HadISST data.

Introduction

This dataset contains Sea Surface Temperature climatologies (HadISST SST, Version 1.1) and Sea Ice coverage (HadISST ICE, Version 1.1).

HadISST v.1.1 replaces the GISST/GICE v.2.3b data sets ended in February 2003. HadISST has a different sea-ice analysis from GISST; as a consequence of this, the data will not be available until the 2nd of the month, 2 months afterwards (e.g. January's data will become available in March).

The data available is grouped into 2 sections:

Global Ocean Surface Temperature (HadISST_1.1_SST), a set of SST data in monthly 1° area grids, for 1870 to present.
Global sea-Ice content, (HadISST_1.1_ICE), monthly 1° grids of ice coverage for 1870 to present.

In situ sea surface observations and satellite derived estimates at the sea surface are included in the analysis. SST bucket corrections have been applied to gridded fields from 1870 through 1941. And a blend of satellite AVHRR (for SST), SSMI (for ice) and observations are used in the modern periods.

This data is provided by the Hadley Centre, Met Office.

Latest News on 8th March 2011: The switch of satellite source data at the start of 2009 introduced a discontinuity in the fields of sea ice in both the Arctic and Antarctic.

Latest News on 3rd December 2010: The SSM/I satellite that is used to provide the data for the sea ice analysis in HadISST suffered a significant degradation in performance through January and February 2009. The problem affected HadISST fields from January 2009 and probably causes an underestimate of ice extent and concentration. It also affected ses surface temperatures in sea ice areas because the SSTs are estimated from the sea ice concentration. As of 3rd December 2010, the Met Office Hadley Centre has reprocessed the data from January 2009 to the preseent using a difference sea ice data source. This is an improvement on the previous situation but users should stil note that the switch of data source at the start of 2009 might introduce a discontinuity into the record. The reprocessed files are available from the BADC archive.

Restricted Data Access

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 HadISST data includes 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 directly.

Your application for accessing the HadISST 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 HadISST directories via your login account from the BADC WWW Archive pages or by FTP.

Please read the 00README file available under /badc/ukmo-hadisst/ directory to to guide you through the tree structure and the data directory.

Data availability and file format

The data held at the BADC, are stored in a simple ASCII format (plain text and "human" readable). Each ASCII file consists of one year of monthly data. Information relative to the file format can be found in the documentation as provided by the Met Office. The data is updated monthly.

See above in the Introduction section for the Latest News.

The CEDA Web Processing Service (WPS) can be used to extract a temporal subset of the HadISST variables

Documentation and Links to further information and references

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

A recent paper about HadISST has been published in the Journal of Geophysical Research.

Also available is the GOSTAplus CD-ROM which contains some GISST, GICE, MOHSST6, MOHMATN4 data (to 1995) and maps. For more information about this CD-ROM, go to the GostaPlus BADC data Web page.

When using the data set in a paper, the following is the correct citation to use:

Rayner, N. A.; Parker, D. E.; Horton, E. B.; Folland, C. K.; Alexander, L. V.; Rowell, D. P.; Kent, E. C.; Kaplan, A. (2003) Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century, J. Geophys. Res., Vol. 108, No. D14, 4407 10.1029/2002JD002670

Citation

Met Office, Hadley Centre. HadISST 1.1 - Global sea-Ice coverage and SST (1870-Present), [Internet]. NCAS British Atmospheric Data Centre, 2006, Date of citation,. Available from http://badc.nerc.ac.uk/view/badc.nerc.ac.uk__ATOM__dataent_hadisst

Who to contact

If you have queries about these pages or about obtaining the Met Office HadISST 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".

See introduction.

Quality Statement
Description of the relative quality of the dataset.

Operational data

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	http://hadobs.metoffice.com/

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
Documentation	Met Office Hadley Centre Observations Datasets website
Documentation	BADC Doc: List of HadISST References
Documentation	BADC Doc: HadISST File Format
Tools	CEDA WPS to extract a temporal subset of HadISST variables
Download	HadISST Data Directory
Apply for access	Apply for access to HadISST
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

MONTHLYMEAN	SEASURFACETEMPERATURE	OCEANTEMPERATURE	OCEANS
EARTH SCIENCE	NULL	SEAICECONCENTRATION	SEAICE

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
MONTHLYMEAN	http://vocab.ndg.nerc.ac.uk/term/null	NULL
SEASURFACETEMPERATURE	http://vocab.ndg.nerc.ac.uk/term/null	NULL
OCEANTEMPERATURE	http://vocab.ndg.nerc.ac.uk/term/P141	NULL
OCEANS	http://vocab.ndg.nerc.ac.uk/term/P131	NULL
EARTH SCIENCE	http://vocab.ndg.nerc.ac.uk/term/P111	GCAT0001
NULL	general_units	0
SEAICECONCENTRATION	http://vocab.ndg.nerc.ac.uk/term/null	NULL
SEAICE	http://vocab.ndg.nerc.ac.uk/term/P141	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:	1870-01-01
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

monthly

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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