HR: 1340h
AN: U43A-0857    [Abstracts]
TI: Total Solar Irradiance Time Series since 1975
AU: * Frohlich, C
EM: cfrohlich@pmodwrc.ch
AF: Physikalisch-Meteorologisches Observatorium Davos, Dorfstrasse 33, Davos Dorf, CH 7260, Switzerland
AB: Total solar irradiance measurements from different satellites are available since late 1978 and may be extended by reliable models back to the minimum between cycles 19 and 20. This time series shows a slight downward trend of the values of the three minima and its significance will be discussed. This trend is confirmed by the analysis of the average over each cycle which is supposed to influence the long-term climate change. It is also manifested in all solar activity related indices in a very similar way and is found only after about 1980, before they all show an upward trend. The corresponding NH temperature record does not show such a change in trend. For the determination of the climate sensitivity this has to be taken into account. Thus, the use of the 11-year cycle modulation only, as performed by Camp and Tung (GRL, Doi: 10.1029/2007GL030207) may need some modification. Moreover, they used the result of a model and not the measured values. A possibility to overcome these drawbacks is proposed.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1621 Cryospheric change (0776)
DE: 1622 Earth system modeling (1225)
DE: 1641 Sea level change (1222, 1225, 4556)
SC: Union [U]
MN: 2007 Fall Meeting