This is the thirteenth ECMWF-users' newsletter.  To get copies of previous
newsletters, use anonymous FTP to ncardata.ucar.edu [128.117.8.111] and
change directory to datasets/ds111.2/news.  Or, use a WWW client such
as Mosaic and open http://www.ucar.edu, then select the NCAR Research Data 
Archives.  This will get you into the Data Support Section ftp area with a 
nicer interface.  You can then get into the ECMWF information via the 
information on ds111.2 (under the "frequently used datasets" or the menu
of all datasets).

                        31 August 1994

CONTENTS:

	o Basic Consolidated dataset (ds111.2) updated through March 1994

        o Advanced Operational Analysis datasets (ds111.0, .1, .3) updated
          through June 1994

	o Changes since the 1993 Technical Attachment

============================================================================

	Basic Consolidated dataset (ds111.2) update

The Basic Consolidated dataset (ds111.2) has been updated with the 
January - March 1994 data.   You can get the full list of VSNs from the 
MASTER file in the /datasets/ds111.2 directory in the ftp area on 
ncardata.ucar.edu.

============================================================================

        Advanced Operational Analysis (ds111.0, .1, .3) update

The Advanced Operational Analysis datasets (ds111.0, .1, .3) have been
updated with the January - June 1994 data.   You can get the full list
of VSNs from the MASTER files from the ftp area on ncardata.ucar.edu.

============================================================================

	Changes since the 1993 Technical Attachment

A new version of the Technical Attachment to the Description of the 
ECMWF/WCRP Level III-A Global Atmospheric Data Archive was received
from ECMWF.  The following changes to the model since the previous
version of this document were noted:

1 Feb 1993:  Changes to the horizontal diffusion and the cloud radiation
scheme.  Inclusion of shortwave optical properties for ice and mixed
phase clouds, and revision to the clear-ski absorption coefficients.

4 Aug 1993:  Changes in model physics to improve representation of
surface and planetary boundary layer processes.  Impact of these
changes:  overall synoptic improvement of predicted flow, particularly
over Europe in the summer;  significant reduction of the warm bias
in continental boundary layer during daytime in summer;  improvement of 
the humidity in the boundary layer, with more realistic diurnal cycle.

[For more detail on this change, email me with your mailing address
and I'll send you a copy of ECMWF's Attachment 3 which describes the
changes to the model.]

5 October 1993:  Change to the boundary layer parameterization;
profiles of 2m T revised to reduce coupling between skin T and lowest
model levels T.

11 October 1993:  Pre-processing modified to correct radiosonde
observations for systematic biases prior to their use.  Correction is
applied to stations which present significant bias in geopotential height
due to radiative effects.

For a complete list of changes to the model since inception on 1 January
1985, email me with your mailing address.  OR, for a complete copy of
the Technical Attachment to the Description of the ECMWF/WCRP Level III-A
Global Atmospheric Data Archive, contact ECMWF, Shinfield Park,
Reading/Berkshire, RG2 9AX United Kingdom.  

============================================================================

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If you are interested in ordering any ECMWF/TOGA data, or any other data
from NCAR's archives, please contact me.  I can be reached at
ilana@ncar.ucar.edu or by phone at (303)497-1214.

Ilana Stern
Data Support Section
National Center for Atmospheric Research