Effect of Solar Variability on Earth Climate Patterns.

Details Effect of Solar Variability on Earth Climate Patterns. Effect of Solar Variability on Earth Climate Patterns.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0357r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0357

Other

3305 Climate Change And Variability (1616, 1635, 3309, 4215, 4513), 7537 Solar And Stellar Variability (1650), 7938 Impacts On Humans, 7974 Solar Effects

Scientific paper

We discuss the impact of solar variability on the patterns of Earth climate variability. These climate patterns are naturally excited in the noisy atmosphere-ocean dynamical system as deviations (anomalies) from a global (mean) state. The patterns include North Atlantic Oscillation (NAO) and related Northern Annular Mode (NAM), Southern Annular Mode (SAM), Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO). An example of a pattern influenced by variations in solar UV irradiance is the NAM, a wintertime climate anomaly with two states corresponding to higher pressure at high latitudes with a band of lower pressure at lower latitudes and the other way round (Thompson &Wallace, 1998). Two states of the NAM arise due to the dynamical interaction of planetary waves and zonal mean wind (Limpasuvan &Hartmann, 2001; Ruzmaikin et al., 2006). The NAM accounts for 23% of atmospheric variability at sea level and about 50% of the variability in the stratosphere. Solar variability affects the NAM and that the influence varies dependent on the phase of the Quasi Biennial Oscillation and time in the winter season (Ruzmaikin &Feynman, 2002). The temperature pattern (cold in Europe-warm in Greenland) produced by the negative NAM was dominant during the Maunder Minimum of solar activity (Ruzmaikin et al., 2004). We discuss possible physical mechanisms by which solar variability can influence the climate patterns. In particular, we address the Rossby-Palmer hypothesis (Palmer, 1998) that external forcing (in our case solar variability) may affect only the magnitude of the pattern variability without changing its spatial structure. References: Thompson, D. W. J. &J. M. Wallace, Geophys. Res. Lett., 25, 1297, 1998; Palmer, T. N., Bull. Amer. Meteor. Soc., 79, 1412 1998; Baldwin, M. P. and T. J. Dunkerton, J. Geophys. Res. 104, 30,937, 1999; Limpasuvan, V., &D. Hartmann, J. Climate, 13, 4414, 2001; Ruzmaikin, A., J, Feynman, J. Geophys. Res., 107, D14, 10.1029/2001JD001239, 2002; Ruzmaikin, A., J, Feynman, Xun Jiang, D. C. Noone, A. M. Waple &Y. L. Yung, Geophys. Res. Let., 31, L12201, 2004; Ruzmaikin, A., J. K. Lawrence &A. C. Cadavid, J. Atmos. Space Phys., 68, 1311, 2006.

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