Print 2013. Geophys Res Lett 35:L12708. When many sunspots are visible, the Sun is somewhat brighter than in "quiet" times and radiates considerably more in the ultraviolet. For the first time, model calculations show a plausible way that fluctuations in solar activity could have a tangible impact on the climate. Here we assess the effects of solar UV radiation on biogeochemical cycles and the interactions of these effects with climate change, including feedbacks on climate. This can strongly affect the chemistry and thermal structure of the upper atmosphere. doi:10.1175/2008jcli2442.1, Roderick ML, Farquhar GD (2002) The cause of decreased pan evaporation over the past 50 years. Absorption of solar radiation by ozone shields the terrestrial surface from harmful ultraviolet light and warms the stratosphere, producing maximum temperatures of −15 to 10 °C (5 to 50 °F) at an altitude of 50 km (30 miles). doi:10.1029/2009jd012841, Ohmura A, Gilgen H, Wild M (1989) Global energy balance archive GEBA, world climate program – water project A7. doi:10.1029/2008jd011624, Mishchenko MI, Geogdzhayev IV, Rossow WB, Cairns B, Carlson BE, Lacis AA, Liu L, Travis LD (2007) Long-term satellite record reveals likely recent aerosol trend. J Climate 11:2042–2061, Dutton EG, Nelson DW, Stone RS, Longenecker D, Carbaugh G, Harris JM, Wendell J (2006) Decadal variations in surface solar irradiance as observed in a globally remote network. Science 317:1381–1384. doi:10.1029/2006gl027585, Ohmura A, Bauder A, Muller H, Kappenberger G (2007) Long-term change of mass balance and the role of radiation. Over the same period, global temperature has risen markedly. From rising temperatures, warmer winter weather and more frequent extreme floods and droughts, the changing environment will greatly affect our day-to-day lives. For example, increases in oxygen-deficient regions of the ocean caused by climate change are projected to enhance the emissions of nitrous oxide, an important greenhouse and ozone-depleting gas. Effects of stratospheric ozone depletion, solar UV radiation, and climate change on biogeochemical cycling: interactions and feedbacks. The total solar irradiance (TSI), improperly called “solar constant” until a few years ago, has been found to change about 0.1% in an 11-year solar sunspot activity. The effect of this is to warm the Earth’s surface and the lower atmosphere. Solar activity has been on a declining trend since the 1960s, as indicated by solar cycles 19-24, in which the maximum number of sunspots were 201, 111, 165, 159, 121 and 82, respectively. doi:10.1029/2008jd011372, Wild M, Schmucki E (2010) Assessment of global dimming and brightening in IPCC-AR4/CMIP3 models and ERA40, Ruckstuhl C, Norris JR (2009) How do aerosol histories affect solar “dimming” and “brightening” over Europe? ... More solar energy is absorbed at the surface and ocean temperatures rise. doi:10.1029/2008jd011104, Sanchez-Lorenzo A, Brunetti M, Calbo J, Martin-Vide J (2007) Recent spatial and temporal variability and trends of sunshine duration over the Iberian Peninsula from a homogenized data set. doi:10.1029/2007gl031133, Norris JR, Wild M (2007) Trends in aerosol radiative effects over Europe inferred from observed cloud cover, solar “dimming” and solar “brightening”. Climate is not the same as weather. J Geophys Res Atmos 114:D00d15. Of these, the two factors relevant on timescales of contemporary climate change are changes in … Geophys Res Lett 33:L15806. This illustration shows the major ocean currents throughout the globe. J Geophys Res Atmos 115:D00d00. J Geophys Res Atmos 114:D00d06. Erickson DJ 3rd, Sulzberger B, Zepp RG, Austin AT. doi: 10.1371/journal.pone.0068858. NLM It should be noted that the change in climate due to solar variability is likely small, but more research needs to be done. Science 298:1410–1411, Ohmura A, Lang H (1989) Secular variations of global radiation in Europe. Tellus 42B:206–210, Dutton EG, Stone RS, Nelson DW, Mendonca BG (1991) Recent interannual variations in solar-radiation, cloudiness, and surface-temperature at the south-pole. The Sun affects the climate through several physical processes: For one thing, the total radiation, particularly that in the ultraviolet range, varies with solar activity. The amount of solar energy received by the Earth has followed the Sun’s natural 11-year cycle of small ups and downs with no net increase since the 1950s.

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