HR: 09:45h
AN: A51D-08    [Abstracts]
TI: Solar Constant or Terrestrial Reflectance -- Which Changes More?
AU: * Goode, P R
EM: pgoode@bbso.njit.edu
AF: Big Bear Solar Observatory, New Jersey Institute of Technology 40386 N. Shore Lane, Big Bear City, CA 92314, United States
AB: The net energy reaching Earth varies over the solar cycle and longer timescales. The net depends on the solar constant and terrestrial reflectance, but which matters more for climate change? Here, we review our current knowledge of variations of the solar constant from ground-based observations, as well as helioseismic and other satellite data. These place tight limits on the range of variability of the historical Sun. On the other hand, earthshine measurements of the Earth's reflectance over a solar cycle imply variations in net energy deposition that are about an order of magnitude larger than those resulting from the changing solar constant. Connections between changes in the solar constant and Earth's reflectance will be discussed to probe the origin of the terrestrial footprint of the solar cycle, as well as the origin of periods like parts of the Maunder Minimum when the Sun was less active and the Earth was cooler.
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3309 Climatology (1616, 1620, 3305, 4215, 8408)
DE: 7522 Helioseismology
DE: 7536 Solar activity cycle (2162)
DE: 7538 Solar irradiance
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly