References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

Atmos. Chem. Phys. Discuss.

1680-7375

Göttingen, Germany

10.5194/acpd-12-3595-2012

Effects of cosmic ray decreases on cloud microphysics

Svensmark

¹ Enghoff

M. B.

¹ Svensmark

National Space Institute, Technical University of Denmark, Copenhagen, Denmark

01 02 2012

12 2 3595 3617

2012

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Using cloud data from MODIS we investigate the response of cloud microphysics to sudden decreases in galactic cosmic radiation – Forbush decreases – and find responses in effective emissivity, cloud fraction, liquid water content, and optical thickness above the 2–3 sigma level 6–9 days after the minimum in atmospheric ionization and less significant responses for effective radius and cloud condensation nuclei (<2 sigma). The magnitude of the signals agree with derived values, based on simple equations for atmospheric parameters. Furthermore principal components analysis gives a total significance of the signal of 3.1 sigma. We also see a correlation between total solar irradiance and strong Forbush decreases but a clear mechanism connecting this to cloud properties is lacking. There is no signal in the UV radiation. The responses of the parameters correlate linearly with the reduction in the cosmic ray ionization. These results support the suggestion that ions play a significant role in the life-cycle of clouds.

References 1

Bagó, E. P. and Butler, C. J.: The influence of cosmic rays on terrestrial clouds and global warming, Astron. Geophys., 41, 4.18–4.22, 2000.

Bondo, T., Enghoff, M. B., and Svensmark, H.: Model of optical response of marine aerosols to Forbush decreases, Atmos. Chem. Phys., 10, 2765–2776, <a href="http://dx.doi.org/10.5194/acp-10-2765-2010">https://doi.org/10.5194/acp-10-2765-2010</a>, 2010.

Calogovic, J., Albert, C., Arnold, F., Beer, J., Desorgher, L., and Flueckiger, E. O.: Sudden cosmic ray decreases: No change of global cloud cover, Geophys. Res. Lett., 37, L03802, <a href="http://dx.doi.org/10.1029/2009GL041327">https://doi.org/10.1029/2009GL041327</a>, 2010.

Dickinson, R. E.: Solar variability and the lower atmosphere, B. Am. Meteorol. Soc., 56, 1240–1248, 1975.

Dragić, A., Aničin, I., Banjanac, R., Udovičić, V., Joković, D., Maletić, D., and Puzović, J.: Forbush decreases – clouds relation in the neutron monitor era, Astrophys. Space Sci. Trans., 7, 315–318, <a href="http://dx.doi.org/10.5194/astra-7-315-2011">https://doi.org/10.5194/astra-7-315-2011</a>, 2011.

Forbush, S.: A model for particle formation and growth in the atmosphere with molecular resolution in size, Phys. Rev., 51, 1108, <a href="http://dx.doi.org/10.1103/PhysRev.51.1108.3">https://doi.org/10.1103/PhysRev.51.1108.3</a>, 1937.

Froehlich, C.: Solar irradiance variability since 1978 – Revision of the PMOD composite during solar cycle 21, Space Sci. Rev., 125, 53–65, <a href="http://dx.doi.org/10.1007/s11214-006-9046-5">https://doi.org/10.1007/s11214-006-9046-5</a>, iSSI Workshop on Solar Variability and Planetary Climates, Bern, Switzerland, 6–10 June 2005, 2006.

Hobbs, P. V.: Aerosol-Cloud-Climate Interactions, Academic Press, Inc., 1993.

King, M. D., Tsay, S.-C., Platnick, S. E., Wang, M., and Liou, K.-N.: Cloud Retrieval Algorithms for MODIS: Optical Thickness, Effective Particle Radius, and Thermodynamic Phase, Tech. rep., 1997.

Kristjánsson, J. E., Stjern, C. W., Stordal, F., Fjæraa, A. M., Myhre, G., and Jónasson, K.: Cosmic rays, cloud condensation nuclei and clouds – a reassessment using MODIS data, Atmos. Chem. Phys., 8, 7373–7387, <a href="http://dx.doi.org/10.5194/acp-8-7373-2008">https://doi.org/10.5194/acp-8-7373-2008</a>, 2008.

Kulmala, M., Vehkamäki, H., Petäjä, T., Dal Maso, M., Lauri, A., Kerminin, V. M., Birmili, W., and McMurry, P. H.: Formation and growth rates of ultrafine atmospheric particles: a review of observations, J. Aerosol Sci., 35, 143–176, 2004.

Laken, B., Wolfendale, A., and Kniveton, D.: Cosmic ray decreases and changes in the liquid water cloud fraction over the oceans, Geophys. Res. Lett., 36, L23803, <a href="http://dx.doi.org/10.1029/2009GL040961">https://doi.org/10.1029/2009GL040961</a>, 2009.

Laken, B., Kniveton, D., and Wolfendale, A.: Forbush decreases, solar irradiance variations, and anomalous cloud changes, J. Geophys. Res., 116, D09201, <a href="http://dx.doi.org/10.1029/2010JD014900">https://doi.org/10.1029/2010JD014900</a>, 2011.

Levy, R. C., Remer, L. A., Kleidman, R. G., Mattoo, S., Ichoku, C., Kahn, R., and Eck, T. F.: Global evaluation of the Collection 5 MODIS dark-target aerosol products over land, Atmos. Chem. Phys., 10, 10399–10420, <a href="http://dx.doi.org/10.5194/acp-10-10399-2010">https://doi.org/10.5194/acp-10-10399-2010</a>, 2010.

Manninen, H. E., Nieminen, T., Asmi, E., Gagné, S., Häkkinen, S., Lehtipalo, K., Aalto, P., Vana, M., Mirme, A., Mirme, S., Hõrrak, U., Plass-Dülmer, C., Stange, G., Kiss, G., Hoffer, A., Tör\H{o}, N., Moerman, M., Henzing, B., de Leeuw, G., Brinkenberg, M., Kouvarakis, G. N., Bougiatioti, A., Mihalopoulos, N., O'Dowd, C., Ceburnis, D., Arneth, A., Svenningsson, B., Swietlicki, E., Tarozzi, L., Decesari, S., Facchini, M. C., Birmili, W., Sonntag, A., Wiedensohler, A., Boulon, J., Sellegri, K., Laj, P., Gysel, M., Bukowiecki, N., Weingartner, E., Wehrle, G., Laaksonen, A., Hamed, A., Joutsensaari, J., Petäjä, T., Kerminen, V.-M., and Kulmala, M.: EUCAARI ion spectrometer measurements at 12 European sites – analysis of new particle formation events, Atmos. Chem. Phys., 10, 7907–7927, <a href="http://dx.doi.org/10.5194/acp-10-7907-2010">https://doi.org/10.5194/acp-10-7907-2010</a>, 2010.

Marsh, N. D. and Svensmark, H.: Low Cloud Properties Influenced by Cosmic Rays, Phys. Rev. Lett., 85, 5004–5007, <a href="http://dx.doi.org/10.1103/PhysRevLett.85.5004">https://doi.org/10.1103/PhysRevLett.85.5004</a>, 2000.

Meehl, G. A., Arblaster, J. M., Matthes, K., Sassi, F., and van Loon, H.: Amplifying the Pacific Climate Sytstem Response to a Small 11-Year Solar Cycle Forcing, Science, 325, 1114–1118, 2009.

Miller, J. and Miller, J.: Statistics and Chemometrics for Analytical Chemistry, 4th edn., Prentice Hall, 2000.

Remer, L., Kaufman, Y., Tanre, D., Mattoo, S., Chu, D., Martins, J., Li, R., Ichoku, C., Levy, R., Kleidman, R., Eck, T., Vermote, E., and Holben, B.: The MODIS aerosol algorithm, products, and validation, J. Atmos. Sci., 62, 947–973, <a href="http://dx.doi.org/10.1175/JAS3385.1">https://doi.org/10.1175/JAS3385.1</a>, 2005.

Rohs, S., Spang, R., Rohrer, F., Schiller, C., and Vos, H.: A correlation study of high-altitude and midaltitude clouds and galactic cosmic rays by MIPAS-Envisat, J. Geophys. Res.-Atmos., 115, D14212, <a href="http://dx.doi.org/10.1029/2009JD012608">https://doi.org/10.1029/2009JD012608</a>, 2010.

Sloan, T. and Wolfendale, A. W.: Testing the proposed causal link between cosmic rays and cloud cover, Environ. Res. Lett., 3, 024001, <a href="http://dx.doi.org/10.1088/1748-9326/3/2/024001">https://doi.org/10.1088/1748-9326/3/2/024001</a>, 2008.

Snow-Kropla, E. J., Pierce, J. R., Westervelt, D. M., and Trivitayanurak, W.: Cosmic rays, aerosol formation and cloud-condensation nuclei: sensitivities to model uncertainties, Atmos. Chem. Phys., 11, 4001–4013, <a href="http://dx.doi.org/10.5194/acp-11-4001-2011">https://doi.org/10.5194/acp-11-4001-2011</a>, 2011.

Stephens, G. L.: Radiation Profiles in Extended Water Clouds. II: Parameterization Schemes, J. Atmos. Sci., 35, 2123–2132, 1978.

Svensmark, H. and Friis-Christensen, E.: Variation of cosmic ray flux and global cloud coverage – a missing link in solar-climate relationships, J. Atmos. Solar-Terr. Phy., 59, 1225–1232, <a href="http://dx.doi.org/10.1016/S1364-6826(97)00001-1">https://doi.org/10.1016/S1364-6826(97)00001-1</a>, 1997.

Svensmark, H., Bondo, T., and Svensmark, J.: Cosmic ray decreases affect atmospheric aerosols and clouds, Geophys. Res. Lett., 36, L15101, <a href="http://dx.doi.org/10.1029/2009GL038429">https://doi.org/10.1029/2009GL038429</a>, 2009.

Todd, M. C. and Kniveton, D. R.: Short-term variability in satellite-derived cloud cover and galactic cosmic rays: an update, J. Atmos. Terr. Phys., 66, 1205–1211, 2004.

Viereck, R. A. and Puga, L. C.: The NOAA Mg II core-to-wing solar index: Construction of a 20-year time series of chromospheric variability from multiple satellites, J. Geophys. Res., 104, 9995–10005, 1999.

Woods, T., Eparvier, F., Fontenla, J., Harder, J., Kopp, G., McClintock, W., Rottman, G., Smiley, B., and Snow, M.: Solar irradiance variability during the October 2003 solar storm period, Geophys. Res. Lett., 31, L10802, <a href="http://dx.doi.org/10.1029/2004GL019571">https://doi.org/10.1029/2004GL019571</a>, 2004.

Yu, F. and Turco, R. P.: The size-dependent charge fraction of sub-3-nm particles as a key diagnostic of competitive nucleation mechanisms under atmospheric conditions, Atmos. Chem. Phys., 11, 9451–9463, <a href="http://dx.doi.org/10.5194/acp-11-9451-2011">https://doi.org/10.5194/acp-11-9451-2011</a>, 2011.