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Definition of Terms Used Within the DDC Pages

Glossary T

Glossary of acronyms and specialised terms on the IPCC-DDC website.
The definitions shown here are from the IPCC Fifth Assessment Report (AR5) working group glossaries: WGI, WGII and WGIII. The source working group is indicated on each definition.

A | B | C | D | E | F-G | H-I | J-K | L-M | N-O | P-Q | R | S | T | U-V | W-Z


IPCC Third Assessment Report

Temperature Anomaly

See Global Mean Surface Temperature

Terrestrial Biosphere

See Biosphere


Task Group on data and scenario support for Impacts and Climate Analysis (IPCC)

Tide Guage

A device at a coastal location or deep-sea location that continuously measures the level of the sea with respect to the adjacent land. Time averaging of the sea level so recorded gives the observed secular changes of the relative sea level. WGI

Transient Climate Experiment

See Equilibrium and Transient Climate Experiments


In the AR4 and AR5 WGI reports, the word trend designates a change, generally monotonic in time, in the value of a variable. WGI


The boundary between the troposphere and the stratosphere. WGI


The lowest part of the atmosphere, from the surface to about 10 km in altitude at mid-latitudes (ranging from 9 km at high latitude to 16 km in the tropics on average), where clouds and weather phenomena occur. In the troposphere, temperatures generally decrease with height. See also Stratosphere. WGI


Technical Support Unit (IPCC)

Tropospheric Ozone

See Ozone