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Changes have also occurred in other important aspects of climate

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Tuesday, 15 April 2008

It is very probable7 until the twentieth century precipitation will be increased from 0.5 to 1 percent every 10 years in most middle and high latitudes of the Northern Hemisphere continents probable7 and it is that the rains have increased from 0.2 to 0.3 percent in the tropical land areas (10 ° to 10 ° North South). In the tropics, they have not been evident in recent decades. It is also probable7 rains that have fallen in most parts of sub-tropical land in the northern hemisphere (10 ° north and 30 ° north) during the twentieth century, and about 0.3 percent every 10 years. Contrary to what happened in the Northern Hemisphere, no similar systematic change has been detected in the overall averages for different latitudes in the southern hemisphere. The available data are not sufficient to determine trends in rainfall on the oceans.   During the second half of the twentieth century, it is probable7 that under the high and middle latitudes of the Northern Hemisphere frequency of rainfall events has increased from 2 to 4 percent. This increase may be due to several causes, such as changes in atmospheric moisture and thunderstorm activity phenomena depression scale. It is probable7 there has been in the twentieth century an increase of 2 percent of the cloud cover over land of the middle and high latitudes. In most of these areas, this trend corresponds to the decrease of temperature daily, as has been observed. It is very probable7 that since 1950 there has been a decrease in the frequency of extremely low temperatures and an increase, more modest, the frequency of extremely high temperatures. Episodes of warming El Niño / Southern Oscillation (ENSO) (which affects regular regional variations in precipitation and temperatures in most of the tropics and sub-tropics and in some areas of mid-latitude) were more frequent, more Persistent and intense since the mid-70's that over the last 100 years. In the twentieth century (1900 to 1995), there has been a relatively small increase in aggregate surfaces having experienced a severe drought or to catastrophic rainfall. In many regions, these changes are Dominated by inter-decadal and multi variability of climate, such as the tendency of the ENSO to induce a greater number of events warming. In several regions, for example parts of Asia and Africa, observations have shown that the frequency and intensity of droughts have increased. "

Last Updated ( Thursday, 03 July 2008 )

 

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