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The SunCloud project

Upcoming events

6 Events found:

  1. Fri 24. Oct. 2014 11:00 : ETH Zentrum, CHN L 17.1
    Dr. Geert Jan van Oldenborgh : Extreme event attribution: How rare was it, and was it due to climate change?
    Special Event
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  2. Mon 27. Oct. 2014 13:00 : ETH Zentrum, CHN L 17.1
    Anna Possner : The Dynamics and Microphysics of Atmospheric Ship Tracks at the Mesoscale
    Special Event (PhD Defense)
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  3. Mon 27. Oct. 2014 16:15 : ETH Zentrum, CAB G 11
    Prof. Pier Siebesma : What do we know about low cloud feedbacks?
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal
  4. Mon 03. Nov. 2014 16:15 : ETH Zentrum, CAB G 11
    Prof. Andreas Vieli : The role of ocean terminating glaciers and ice sheets in a changing climate
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal
  5. Mon 10. Nov. 2014 16:15 : ETH Zentrum, CAB G 11
    Dr. Ryan R. Neely III : Stratospheric Aerosols and Climate Variability: The Good, The Bad, and The Ugly
    Kolloquium Atmos. & Klima (Kolloquium) NeelyETHAbstract.pdf
    Details iCal
  6. Mon 17. Nov. 2014 16:15 : ETH Zentrum, CAB G 11
    Prof. Daniel Knopf : Heterogeneous Processes of Atmospheric Particles: Ice Nucleation and OH Oxidation Kinetics
    Kolloquium Atmos. & Klima (Kolloquium)
    Details iCal

ETH-Klimablog

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Das IAC bloggt auf dem ETH-Klimablog, der Informationsplattform der ETH Zürich zum Klimawandel. Mehr auf www.klimablog.ethz.ch.

The SunCloud project: An initiative for a development of a worldwide sunshine duration and cloudiness observations dataset

One problem encountered when establishing the causes of global dimming and brightening is the limited number of long-term solar radiation series with accurate and calibrated measurements. For this reason, the analysis is often supported and extended with the use of other climatic variables such as sunshine duration and cloud cover. Specifically, sunshine duration is defined as the amount of time usually expressed in hours that direct solar radiation exceeds a certain threshold (usually taken at 120 W m-2). Consequently, this variable can be considered as an excellent proxy measure of solar radiation at interannual and decadal time scales, with the advantage that measurements of this variable were initiated in the late 19th century in different, worldwide, main meteorological stations. Nevertheless, detailed and up-to-date analysis of sunshine duration behavior on global or hemispheric scales are still missing.

Thus, starting on 2011 in the framework of different research projects, we will engage a worldwide compilation of the longest daily or monthly sunshine duration series from the late 19th century until present. Several quality control checks and homogenization methods will be applied to the generated sunshine dataset. The relationship between the more precise downward solar radiation series from the Global Energy Balance Archive (GEBA) and the homogenized sunshine series will be studied in order to reconstruct global and regional solar irradiance at the Earth’s surface since the late 19th century. Since clouds are the main cause of interannual and decadal variability of radiation reaching the Earth’s surface, as a complement to the long-term sunshine series we will also compile worldwide surface cloudiness observations.

 

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