Solar Cycle Forcing on Kurdistan-Iraq Temperature

Meeran A. Omer1, Slahaddin A. Ahmed1, kais J. Al-Jumaily2

College of Science, University of Sulaimani, 2 College of Science, University of Al-Mustansiriya

The energy transfer from the sun to the atmosphere is one of the primary drivers of the
weather. The Earth climate is strongly affected by the amount of solar radiation emitted
by the sun, which changes with solar activity. The search for cyclicity in the climate record
can resolve some complexities of the atmospheric system. Periodicities in the sun spot
number time series, annual, seasonal temperature time series have been studied visualising
the data for 63 years spanning over the period 1948-2011. The temperature series is
obtained from NCAR-NCEP reanalysis data centre. The sunspot number and temperature
series, where subjected to spectral analysis by multitaper method to investigate the
possible periodicities exist in all series. Several periodicities in the band 10.5-12.5 years are
detected in annual and seasonal temperature where they are related to solar cycle. The
temperature at Kurdistan is negatively correlated with the length of the solar cycle. The
North Atlantic oscillation also affects the temperature of the region through 3.7 years

Keywords: Sunspot Number, Solar Cycle, solar cycle length, Multitaper Method, The National
centre for Environmental Prediction and National Centre for Atmospheric Research,
North Atlantic oscillation.

1- Joint Humanitarians information Centre (JHIC), Duhok.
2- J. W. Hurrell, Y. Kushnir, G. Ottersen and M. Visbeck, "The Sun and space weather", Kluwer Academic Publishers New York, Boston, Dordrecht, London, Moscow, (2004).
3- M. Brunetti, "Solar signals in instrumental historical series of meteorological parameters", Mem. S.A.It., Vol. 74, pp. 778, (2003).
4-B. N. Dwivedi and U. Narain, "The physics of the sun and its atmosphere", Published by World Scientific Publishing Co. Pte. Ltd, (2008).
5- I. M. ardavas and F. W. Taylor, "Radiation and Climate", Oxford university press, (2002).
6- J. Solheim., K. Stordahl. and O. Humlum, "The long sunspot cycle 23 predicts a significant temperature decrease in cycle 24", Journal of Atmospheric and SolarTerrestrial Physics, Vol. 80, P. 267-284, (2012).
7- M. Rajamoorthy, P. Duraisamy, J. R. Pazhaniswami and P. Selvarajan, "Influence of the solar activity on the global temperature", World Journal of Science and Technology vol. 1, pp. 2231, (2011).
8- E. Friis-Christensen. and K. Lassen, "Length of the solar cycle: an indicator of solar activity closely associated with climate", Science, New Series, vol. 254, no. 5032, pp. 698–700, (1991).
9- B. Jerzy and S. Maria, "Cyclic temperature and precipitation fluctuations in Poland in the 19th -21st centuries", Miscellanea Geographica, Vol. 12, pp.43-53, (2006).
10- C. J. Butler, "Maximum and minimum temperatures at Armagh observatory, 1844–1992, and the length of the sunspot cycle", Solar Physics, vol. 152, no. 1, pp. 35–42, (1994).
11- J. W. Hurrell, Y. Kushnir,G. Ottersen and M. Visbeck, "The North Atlantic Oscillation Climatic Significance and Environmental Impacts", American Geophysical union, Washington D.C., (2003)
12- H. M. Cullen and P. B. deMenocal, "North Atlantic influence on Tigris- Euphrates stream flow", International Journal of climatology, Vol. 20, P.835, (2001).
13- R. Kistler, E. Kalnay, W. Collins, S. Saha, G. White, J. Woollen, M. Chelliah, W. Ebisuzaki, M. Kanamitsu,V. Kousky, H. Dool, R. Jenne, and M. Fiorino, "The NCEP-NCAR 50-year reanalysis monthly means CD-Rom and Documentation", American Meteorological Society, Vol. 82, P. 2, 14- G. Paltridge & A. Arking & M. Pook, "Trend in Middle and Upper Level Tropospheric Humidity from Reanalysis Data", Theoretical Applied Climatology, Vol.10, P.1007, (2009).
15- H. Nagi, "Time series applications to finance", John Wiley & sons, Inc., publication, (2002).
16- K. Oduro-Afriyie and D.C. Adukpo, "spectral characteristics of the annual mean rainfall series in Ghana", West Africa journal of applied Ecology, vol. 9, pp. 855, (2006).
17- M. Ghil, M. R. Allen and et al., "Advanced spectral methods for climate time series", Review of Geophysics journal, Vol. 1, pp. 1-41, (2001).
18- G. A. prieto, R. L. parker and F. L. Vernon, "A Fortran 90 library for multiplier spectrum analysis", Journal of computers and Geosciences, Vol. 3, pp. 1701- 1710, Elsevier, (2009).
19- A. Victorin., "Multi-taper methods for spectral analysis and signal reconstruction for solar wind data", Msc. Thesis, Dep. Of electrical engineering, university of kwazulu-Natal, (2007).
20- M. E. Mann and J. Park, "Joint spatiotemporal modes of surface temperature and sea level pressure variability in the northern hemisphere during the last century", Journal of climate, vol. 9, pp. 2137, (1996).2001)