Worldwide systematic observation of the climate system is a key prerequisite for advancing scientific
knowledge on climate change. The Convention calls on Parties to promote and cooperate in systematic
observation of the climate system, including through support to existing international programmes and
networks, as indicated in Articles 4.1(g) and 5 of the Convention. A key dimension for the implementation of
those Articles has been the cooperation with the Global Climate Observing System (GCOS) secretariat of the
World Meteorological Organization (WMO) and other agencies participating in WMO's Climate Agenda.
COP 5 urged Parties to address deficiencies in climate observing networks. It also invited all Parties to
provide detailed reports on systematic observation in line with the reporting guidelines on
global climate observing systems (as part of their national communications for Annex I Parties and
on a voluntary basis for non-Annex I Parties).
Later on, by decision 11/CP.13 (refers to
page 45) on Reporting on global observing systems for climate, the COP adopted revised UNFCCC reporting
guidelines on global climate change observing systems and decided that these revised guidelines
should take effect for the preparation of detailed technical reports on systematic observation in accordance
with the provisions of decisions 4/CP.5 and 5/CP.5. The decision further requests Annex I Parties to
continue providing such reports in conjunction with their national communications.
For the latest national communications from Annex I Parties, including technical reports on systematic
observation, see here
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