ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-11679-2011 The influence of solar variability and the quasi-biennial oscillation on lower atmospheric temperatures and sea level pressure Roy I. 1 Haigh J. D. 1 Blackett Laboratory, Imperial College London, London, UK 22 11 2011 11 22 11679 11687 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/11679/2011/acp-11-11679-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/11679/2011/acp-11-11679-2011.pdf

Our fundamental aim is to investigate solar cycle signals in sea level pressure. In order to see if these may relate, especially at high latitudes, to the solar influence on the stratosphere we start by investigating the temperature of the winter polar stratosphere and its dependence on the state of the Sun and the phase of the Quasi-Biennial Oscillation (QBO). We find that the choice of pressure level used to define the phase of the QBO is important in determining how the solar and QBO influences appear to act in combination. <br><br> Informed by this we carry out a multiple linear regression analysis of zonal mean temperatures throughout the lower stratosphere and troposphere. A combined solar*QBO temporal index exhibits strongly in the lower stratosphere, but in much of the troposphere any influence of the QBO, either on its own or coupled to solar effects is much smaller than the pure solar signal. <br><br> We use a similar approach to analyse sea level pressure (SLP) data, first using a standard QBO time series dating back to 1953. We find at high latitudes that individually the solar and QBO signals are weak but that the compound solar*QBO temporal index shows a significant signal. This is such that combinations of low solar activity with westerly QBO and high solar activity with easterly QBO are both associated with a strengthening in the polar modes; while the opposite combinations coincide with a weakening. By employing a QBO dataset reconstructed back to 1900, we extend the SLP analysis back to that date and also find a robust signal in the surface SAM; though weaker for surface NAM. <br><br> Our results suggest that solar variability, modulated by the phase of QBO, influences zonal mean temperatures at high latitudes in the lower stratosphere, in the mid-latitude troposphere and sea level pressure near the poles. Thus a knowledge of the state of the Sun, and the phase of the QBO might be useful in surface climate prediction.

 References % vor jede Referenz Allan, R. and Ansell, T.: A new globally complete monthly historical gridded mean sea level pressure dataset (HadSLP2): 1850–2004, J. Climate, 19, 5816–5842, 2006. Baldwin, M. P. and Dunkerton, T. J.: Propagation of the Arctic Oscillation from the stratosphere to the troposphere, J. Geophys. Res.-Atmos., 104, 30937–30946, 1999. Baldwin, M. P. and Dunkerton, T. J.: Stratospheric harbingers of anomalous weather regimes, Science, 294, 581–584, 2001. Baldwin, M. P. and Dunkerton, T. J.: The solar cycle and stratosphere-troposphere dynamical coupling, J. Atmos. Solar-Terr. Phys., 67, 71–82, 2005. Brönnimann, S., Annis, J. L., Vogler, C., and Jones, P. D.: Reconstructing the quasi-biennial oscillation back to the early 1900s, Geophys. Res. Lett., 34, L22805, http://dx.doi.org/10.1029/2007gl031354doi:10.1029/2007gl031354, 2007. Camargo, S. J. and Sobel, A. H.: Revisiting the influence of the Quasi-Biennial Oscillation on tropical cyclone activity, J. Climate, 23, 5810–5825, 2010. Camp, C. D. and Tung, K. K.: The influence of the solar cycle and QBO on the late-winter stratospheric polar vortex, J. Atmos. Sci., 64, 1267–1283, http://dx.doi.org/10.1175/jas3883.1doi:10.1175/jas3883.1, 2007. Dunkerton, T. J. and Baldwin, M. P.: Modes of interannual variability in the stratosphere, Geophys. Res. Lett., 19, 49–52, 1992. Frame, T. H. A. and Gray, L. J.: The 11-Yr Solar Cycle in ERA-40 Data: An Update to 2008, J. Climate, 23, 2213–2222, http://dx.doi.org/10.1175/2009jcli3150.1doi:10.1175/2009jcli3150.1, 2010. Gray, L. J., Crooks, S., Pascoe, C., Sparrow, S., and Palmer, M.: Solar and QBO influences on the timing of stratospheric sudden warmings, J. Atmos. Sci., 61, 2777–2796, 2004. Gray, L. J., Beer, J., Geller, M., Haigh, J. D., Lockwood, M., Matthes, K., Cubasch, U., Fleitmann, D., Harrison, G., Hood, L., Luterbacher, J., Meehl, G. A., Shindell, D., van Geel, B., and White W.: Solar influences on climate, Rev. Geophys., 48, RG4001, http://dx.doi.org/10.1029/2009RG000282doi:10.1029/2009RG000282, 2010. Haigh, J. D.: The impact of solar variability on climate, Science, 272, 981–984, 1996. Haigh, J. D.: The effects of solar variability on the Earth's climate, Philos. T. Roy. Soc. London Series a, 361, 95–111, 2003. Haigh, J. D. and Roscoe, H. K.: Solar influences on polar modes of variability, Meteorol. Z., 15, 371–378, 2006. Haigh, J. D. and Roscoe, H. K.: The Final Warming Date of the Antarctic Polar Vortex and Influences on its Interannual Variability, J. Climate, 22, 5809–5819, http://dx.doi.org/10.1175/2009jcli2865.1doi:10.1175/2009jcli2865.1, 2009. Haigh, J. D., Blackburn, M., and Day, R.: The response of tropospheric circulation to perturbations in lower stratospheric temperature, J. Climate, 18, 3672–3685, 2005. Holton, J. R. and Tan, H.-C..: The influence of the equatorial quasi-biennial oscillation on the global circulation at 50 mb, J. Atmos. Sci., 37, 2200–2208, 1980. Holton, J. R. and Tan, H.-C.: The quasi-biennial oscillation in the Northern Hemisphere lower stratosphere, J. Meteorol. Soc. Jpn, 60, 140–148, 1982. Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Saha, S., White, G., Woollen, J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K. C., Ropelewski, C., Wang, J., Leetmaa, A., Reynolds, R., Jenne, R., and Joseph, D.: The NCEP/NCAR 40-year reanalysis project, B. Am. Meteorol. Soc., 77, 437–471, 1996. Labitzke, K.: Sunspots, the QBO, and the stratopsheric temperature in the North polar-region, Geophys. Res. Lett., 14, 535–537, 1987. Labitzke, K.: The Berlin stratospheric data series. Meteorological Institute, Free University of Berlin, CD-ROM, 2002. Labitzke, K. and van Loon, H.: On the association between the QBO and the extratropical stratosphere, J. Atmos. Terr. Phys., 54, 1453–1463, 1992. Labitzke, K., Kunzel, M., and Brönnimann, S.: Sunspots, the QBO and the stratosphere in the North Polar Region – 20 years later, Meteorol. Z., 15, 355–363, 2006. Lu, H., Gray, L. J., Baldwin, M. P., and Jarvis, M. J.: Life cycle of the QBO-modulated 11-year solar cycle signals in the Northern Hemispheric winter, Q. J. Roy. Meteorol. Soc., 135, 1030–1043, http://dx.doi.org/10.1002/qj.419doi:10.1002/qj.419, 2009. Matthes, K. , Langematz, U., Gray, L., Kodera, K., and Labitzke, K.: Improved 11-year solar signal in the Freie Universitat Berlin Climate Middle Atmosphere Model (FUB-CMAM), J. Geophys. Res., 109, D06101, http://dx.doi.org/10.1029/2003JD004012doi:10.1029/2003JD004012, 2004. Naito, T. and Hirota, I..: Interannual variability of the Northern winter stratospheric circulation related to the QBO and the solar cycle, J. Meteorol. Soc. Jpn, 75, 925–937, 1997. Naujokat, B.: An update of the observed quasi-biennial oscillation of the stratospheric winds over the tropics, J. Atmos. Sci., 43, 1873–1877, 1986. Roy, I. and Haigh, J. D.: Solar cycle signals in sea level pressure and sea surface temperature, Atmos. Chem. Phys., 10, 3147–3153, http://dx.doi.org/10.5194/acp-10-3147-2010doi:10.5194/acp-10-3147-2010, 2010. Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L.: Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, 2007. Thompson, D. W. J. and Wallace, J. M.: Annular modes in the extratropical circulation. Part I: Month-to-month variability, J. Climate, 13, 1000–1016, 2000. Thompson, D. W. J., Baldwin, M. P., and Solomon, S.: Stratosphere-troposphere coupling in the Southern Hemisphere, J. Atmos. Sci., 62, 708–715, 2005.