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Responsibility for
the approval of changes to each Member State's dissemination
requirements is assigned to the Member State Technical Advisory
Committee (TAC) representative and to the Head of Operations at
ECMWF.
ECMWF is willing to
maintain requirements on behalf of Member States and make changes
when necessary. Provided two working days notice are given, changes
can usually be introduced on the following Tuesday. Requests for
changes must be made in writing or by computer mail; they should be
signed by, or originate from, the TAC representative, and should be
addressed either to the Head of the "Data and Services Section" or
to the Head of Operations, ECMWF.
Alternatively, the
TAC representative of a Member State or the person authorised by
the TAC representative may maintain requirements using the web
facility described below.
Note that acceptance
of changes to requirements is dependent upon the total requirements
of a Member State in terms of products and data volume, and the
total data volume for all Member States combined remaining below
given limits. These limits are enforced to prevent the requirements
of any one Member State having an adverse effect on the generation
of products for, and dissemination of products to, the remainder of
Member States. Where interactive facilities are provided, the
support software imposes these limits. The limits are reviewed and
revised as the capacity to generate and disseminate products
increases. Any Member State encountering difficulties arising from
such limits should inform ECMWF.
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