HR: 0830h
AN: A41E-02    [Abstracts]
TI: Anthropogenic Influence on Lower Atmospheric Temperature Trends
AU: de Laat, J
EM: a.t.j.de.laat@sron.nl
AF: SRON National Institute for Space Research, Sorbonnelaan 2, Utrecht, 3584 CA Netherlands
AU: * Maurellis, A N
EM: a.n.maurellis@sron.nl
AF: SRON National Institute for Space Research, Sorbonnelaan 2, Utrecht, 3584 CA Netherlands
AB: Surface temperature trends during the last two decades show a significant increase which appears to be anthropogenic in origin. By this it is meant that global temperature changes using surface as well as satellite measurements show that lower tropospheric temperature trends for the last three decades are spatially correlated to surface CO2 emissions, which can be used as a measure of direct anthropogenic influence on global warming. Furthermore, temperature trends for the regions not spatially correlated with CO2 emissions are considerably smaller or even negligible for some of the satellite data. Very similar results are arrived at after analysing many other data sets, including NCEP and ECMWF. It is also possible to show, using the same measure, that two important climate models do not reproduce the geographical climate response to all known forcings as found in the observed temperature trends. Thus it becomes interesting to consider whether a component of the observed surface temperature changes might be a result of local warming processes in addition to global greenhouse forcing.
DE: 1610 Atmosphere (0315, 0325)
DE: 1640 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly