http://www.youtube.com/watch?v=LFe0oe-537Q
http://www.youtube.com/watch?v=cddnqGXeJmE&feature=relmfu
http://www.youtube.com/watch?v=LFe0oe-537Q
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E sad ono "ali sto svim nama srecu kvari"
UV indeks zracenja:
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Indicator: A-13 Surface ultraviolet radiation in Australia
On this page
Data
What the data mean
Data Limitations
Issues for which this is an indicator and why
Acknowledgment
Data
Clear sky UV index for selected Australian cities
Clear sky UV index for selected Australian cities
Bureau of Meteorology, March 2005
Monthly average clear-sky UV Index 1997 - 2005 (Excel - 59 KB)

Summer (Dec-Feb) average clear sky UV Index
[img]http://www.environment.gov.au/soe/2006/publications/drs/images/202/atmosphere/figures/medium/a13uv-radiation-summer3.gif [/img]
Summer (Dec-Feb) average clear sky UV Index
Bureau of Meteorology, March 2005
Monthly average clear-sky UV Index 1997 - 2005 (Excel - 26 KB)
Total ozone in a vertical column and the values of the erythemal UV index
Total ozone in a vertical column and the values of the erythemal UV index

Graphed by CSIRO Marine and Atmospheric Research on the basis of data obtained from A Downey, Bureau of Meterology and R McKenzie, NIWA
Total ozone in a vertical column and the values of the erythemal UV index - underlying data (Excel - 27 KB)
What the data mean
The data shows monthly averages of the UV-Index for the period January 1997 to February 2005 for six capital cities in Australia: Darwin, Brisbane, Perth, Sydney, Adelaide and Melbourne.
As would be expected the UV-Index is highest for those cities closest to the equator, such as Darwin and Brisbane. Taking into account some measurement problems for Darwin and Brisbane in the summer of 2002-03 and 2003-04 (see data limitations section below), the data appears to show a very small decrease in UV levels between 1997 and 2005 (figure 1). However, data over a longer time series would be required before any conclusions could be drawn.
The monthly average of the UV-Index for the summer period (December to February) (figure 2) has been extracted from the above and averaged over the three months (or two months in the case of the 1996-97 summer). Taking into account the measurement problems with some summer readings for Darwin and Brisbane, there appears to be a small decline in the UV-Index between 1997 and 2005. Once again a longer series of data would be needed before any conclusions were drawn.
Figure 3 shows a comparison of the UV index with ozone levels. At Lauder, UV index values increased by 0.5% per year from 1978 to 1998, corresponding to the period of observed ozone losses. Since 1998, at Lauder and the southern Australian sites, there has been a 1% per year decline in the UV index. The long-term increase in UV index measured at Lauder up to 1998 is consistent with ozone changes, but the rapid decline of approximately 6% in the index since 1998 (in both southern Australia and New Zealand) is larger than calculated based on ozone increases.
Sunburn caused by overexposure to ultraviolet-B (UVB) radiation is known to be the primary cause of skin cancer. To help people choose appropriate levels of protection against skin cancer, the Bureau of Meteorology issues daily forecasts of the UV-Index. The index is a simple and informative way of describing the daily danger of solar UV radiation intensity with the following table showing the different UV-Index categories.
Recommended UV exposure levels UV-index level Exposure category Recommended sub protection precautions
2 or less Low You can safely stay outdoors with minimal protection
3 to 5 Moderate Hat, sunscreen, sunglasses, shady area
6 to 7 High Hat, sunscreen, sunglasses, shady area, stay indoors between 10-2pm (11-3pm daylight savings)
8 to 10 Very high Stay indoors as much as possible, otherwise use all precautions above.
11 plus Extreme Stay indoors as much as possible, otherwise use all precautions above.
Data Limitations
Note: the high UV values for Darwin and Brisbane during the summer 2002-2003 and 2003-2004 are due to very low ozone values at the tropic in the ATOVS data. This problem has been fixed for the summer 2004-2005.
Issues for which this is an indicator and why
Atmosphere - Stratospheric ozone - General stratospheric ozone
This indicator shows the intensity of ultraviolet radiation reaching the surface of the planet which may be affected by ozone depletion.
Other indicators for this issue:
A-10 stratospheric chlorine from the major ozone-depleting substances
A-11 Summer mean total ozone column
A-12 Trend in the area of the ozone hole
A-14 Consumption of ozone-depleting substances - Australian consumption of ozone-depleting substances
A-15 Skin melanoma rates
Land - Contributions and pressures between the land and the atmosphere - Ozone depletion
This indicator shows the intensity of ultraviolet radiation reaching the surface of the planet and impacting on surface dwelling terrestrial life forms.
Coasts and Oceans - Contributions and pressures between the coasts and oceans and the atmosphere - Ozone depletion
This indicator shows the intensity of ultraviolet radiation reaching the surface of the planet and impacting on surface dwelling marine life forms.
Other indicators for this issue:
CO-44 Marine chlorophyll concentration
Acknowledgment
Australia has extreme levels of solar UV radiation because of its location in the middle and low latitudes in the Southern Hemisphere and its relatively clean and cloudless skies. The shorter wavelength UVB radiation is the most harmful to health. Ozone absorbs UV particularly in the UVB part of the spectrum and thus the effect of stratospheric ozone depletion is to increase UVB at the surface. This indicator is a direct measure of the condition and is the same as the Australian and New Zealand Environment and Conservation Council (ANZECC) core indicator A9 and the Theme indicator 2.3.
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Stoga kreme za Sunce sa zastitnim faktorom barem 30+ i naocare za sunce a ako vec nosite naocare onda da imaju ugradjeni UVA i UVB filter