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Viewing posts for the category Met Office data

"Met Office Wind Profiler data is now available from the BADC."
in Met Office data

Met Office Wind Profiler data is now available from the BADC.
==============================================================================

In the late 1990's The Met Office purchased four boundary-layer wind-profilers 
(nominally 1 GHz), from Radian. The instruments are located at Camborne, 
Dunkeswell and Wattisham. The fourth was operated at the NERC MST Radar site at 
Capel Dewi, near Aberystwyth between November 1999 and March 2002; it has now 
been relocated to South Uist. 

Data from these instruments is now available at the BADC for the following 
dates: Camborne from 1998 to 2002, Dunkeswell from 1999 to 2002, and Wattisham 
from 2001 to 2002. Data from the fourth wind-profiler when it was located at 
Aberystwyth is also available.

More information about the wind profiler data held at the BADC can be found at:
http://badc.nerc.ac.uk/data/ukmo-wind-prof/

BADC Support
07th January 2004

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"Met Office Stratospheric Analyses - New Dynamics"
in Met Office data

Met Office Stratospheric Analyses - New Dynamics
------------------------------------------------

The assimilation system that produces the Met Office stratospheric data
will soon be changed to use the New Dynamics (ND) version of the
Unified Model.

The changeover is scheduled for 28th October 2003.

Users of the data need to be aware of the following points:

- The data will be ordered from South to North, instead of North to
South.

- As before, the wind components (u and v) will be produced on a grid
that is staggered relative to the mass grid (used for T and z).  The
output fields use the "Arakawa B grid" staggering, as before, even
though the ND model uses a "C grid" staggering. 

- The vertical velocity will be w (dz/dt), rather than omega (dP/dt),
and will be output on the mass grid. 

- Three additional UARS levels will be output (25 instead of 22), up to
0.1 hPa (instead of 0.316 hPa).

If you use the grid definitions in the PP header record, the changes to
the ordering of the data will be transparent, otherwise you will need
modify your programs to allow for those changes.

Access routines are supplied by the Met Office to help users read the
data files.  The original versions were written to access data from the
UARS CDHF, but recent versions also read PP format data, as supplied to
the BADC.  A revised version of the access routines has been written
(version 5c - file name acsasm_v5c.f).  This is very similar to the
previous version (5b), except that it will recognize the new w fields
(as well as omega), and the default settings for field types and number
of levels have been modified for New Dynamics.  VAX/VMS-specific code
(only a few lines) has been deleted.  

At the BADC, the new data files can be found in the current year
assimilated data directory: /badc/ukmo-assim/data/standard/2003/

The associated documentation, as provided by the Met Office is 
available in the assimilated data doc directory: 
/badc/ukmo-assim/doc/ieee_binary/new_dynamics/

The Assimilated data documentation on the BADC Web pages will be updated
shortly.


BADC Support
28th October 2003
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"A new batch of high resolution radiosonde data is now available from the BADC."
in Met Office data

A new batch of high resolution radiosonde data is now available from the BADC.
==============================================================================

The dataset now includes more recent data and data from extra stations. 
In particular 3 years of data from the St Helena site, and data from the new  
Met Office autosonde sites is now available.

More information about the High Resolution data held at the BADC can be found at:
http://badc.nerc.ac.uk/data/rad-highres/

BADC Support
03th June 2003
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"New HadISST v1.1 dataset released to BADC users"
in Met Office data

The Met Office has now stopped updating GISST/GIICE datasets.

HadISST 1.1 is the replacement product provided by the Hadley Centre at the The Met Office.
It contains monthly long-term global gridded SST and sea ice analysis (1870 to present).

This dataset was available from the Met Office as an historical dataset and is now being made 
operational (i.e. updated every month). 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).

To find out more about this new dataset and access restrictions, please read through the 
HadIsst dataset web pages.

BADC Support 16/04/03.

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"GISST/GICE datasets ended - MOHMATN4 and MOHSST6 still updated"
in Met Office data

The Met Office had planned to stop updating GISST/GIICE datasets in May 2003.
However, some problems were encountered in producing the GISST updates from March 2003.

"The current route for producing GISST uses the version 1 of the Reynolds optimally 
interpolated SSTs as background field in some areas, and these fields are no longer 
being produced. We (The Met Office) could switch to using version 2, but this would 
produce some differences in the result, particularly for areas close to sea-ice."

After careful consideration, the Met Office has decided to stop updating the GISST/GICE 
datasets. The last update is therefore for February 2003.

The Met Office has a replacement product, called HadISST, which has been available 
from the Met Office as an historical dataset and is now being made operational 
(i.e. updated every month). 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 BADC is now working on making this replacement dataset available to registered users.
Users will be informed in due course.

We are sorry for the inconvenience this may cause in the meantime.

BADC Support 11/04/03.

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