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Atmosphere-Climate Working Group General remarks…

Atmosphere-Climate Working Group General remarks… Issues of importance to climate community require climatological (long time scale) data analysis rather than focus on individual events Therefore, studies of sun/climate connections must, in general, rely on decadal or multi-decadal data

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Atmosphere-Climate Working Group General remarks…

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  1. Atmosphere-Climate Working Group • General remarks… • Issues of importance to climate community require climatological (long time scale) data analysis rather than focus on individual events • Therefore, studies of sun/climate connections must, in general, rely on decadal or multi-decadal data • But, there are also a number of sun/atmosphere studies that can be carried out or initiated in the time frame of IHY2007 • …all with attention to coordination with ongoing (e.g., CAWSES, SPARC) programs and prior (e.g., EPIC, PSMOS) programs

  2. Long-term projects • In the form of assessments of scientific understanding of the following areas: • TSI and SRI (photons) reconstructions, especially over time scales longer than the solar cycle (multi-century time scale) • Establish solar minimum irradiance value and change from earlier solar minimum observations • Role of the sun in producing tropospheric/stratospheric climate variability (statistical significance of observations; theoretical “proof” via numerical simulation) – sensitivity of climate to solar variability • Response of stratospheric ozone to solar variability (solar cycle) • Cosmogenic proxies as an indicator of solar activity (solar cycle to milennia)

  3. Long-term datasets • Insofar as multi-year data is essential to the study of sun/climate interactions… • Support allocation of resources to continue measurements by space-based instruments (e.g., TIMED, SORCE, ACRIM, etc.) Continue taking measurements through IHY. • Promote the development of comprehensive databases of solar and atmospheric parameters, covering long time scales (integration of existing satellite, ground-based observations)

  4. Short-term projects (potential campaigns) • Studies that could be carried out during the time span of IHY2007 • Response of atmosphere to impulsive and periodic solar events (e.g., REP, SPE…) • Response to the 27-day solar rotation –inferences for longer term variability • Response of the ionosphere to upward-propagating wave activity (“meteorological variability” to be distinguished from solar) • Effect of cosmic rays on ion nucleation, aerosols, clouds, and climate (theoretical, observational, numerical, and laboratory studies; study Forbush decreases and ground-level enhancements as test cases for longer term changes) • Radar/lidar/rocketsonde observations of stratosphere/lower mesosphere tropical winds (Tropical winds affect the link between solar forcing and atmospheric response below) • Ozonesonde network for the lower tropical stratosphere • Modeling of atmospheric response to solar variability, including model intercomparison • UV effects on the biosphere (including humans).

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