The global temperature anomaly and solar North-South asymmetry
- 94 Downloads
We investigate whether the global temperature anomaly is associated with the solar North-South asymmetry using data archived approximately for five solar cycles. We are motivated by both the accumulating evidence for the connection of Galactic cosmic-rays (GCRs) to the cloud coverage and recent finding of the association of GCR influx and the solar North-South asymmetry. We have analyzed the data of the observed sunspot, the GCR influx observed at the Moscow station, and the global temperature anomaly. We have found that the mean global temperature anomaly is systematically smaller (∼0.56 in the unit of its standard deviation) during the period when the solar northern hemisphere is more active than the solar southern hemisphere. The difference in the mean value of the global temperature anomaly for the two data sets sub-sampled according to the solar North-South asymmetry is large and statistically significant. We suggest the solar North-South asymmetry is related to the global temperature anomaly through modulating the amount of GCR influx. Finally, we conclude by discussing its implications on a climate model and a direction of future work.
Key wordsGalactic cosmic rays solar north-south asymmetry climate change
Unable to display preview. Download preview PDF.
- Fligge, M., S. K. Solanki, and Y. C. Unruh, 2000: Modeling irradiance variations from the surface distribution of the solar magnetic field, Astron. Astrophys., 353, 380–388.Google Scholar
- Georgieva, K., 2002: Long-term changes in atmospheric circulation, earth rotation rate and north-south solar asymmetry, Phys. Chem. Earth, 27(6–8), 433–440.Google Scholar
- —, B. Kirov, and C. Bianchi, 2005: Long-term variations in the correlation between solar activity and climate, Memorie della Societá Astronomica Italiana, 76, 965.Google Scholar
- Goode, P. R., and Coauthors, 2003: Sunshine, Earthshine and Climate Change: II. Solar Origins of Variations in the Earth’s Albedo, J. Korean. Astron. Soc., 36(S1), S83–S91.Google Scholar
- Haigh, J. D., 2007: The Sun and the Earth’s Climate, Liv. Rev. Sol. Phys., 4(2).Google Scholar
- Intergovernmental Panel on Climate Change, 2007: Climate Change 2008: The Physical Science Basis. Cambridge University Press. [Total page range].Google Scholar
- Scafetta, N., 2010: Empirical analysis of the solar contribution to global mean air surface temperature change, J. Atmos. Sol.-Terr. Phys., 71, 17–18, 1916–1923.Google Scholar
- Usoskin, I. G., 2008: A History of Solar Activity over Millennia, Solar Physics, 5(3).Google Scholar