Now, however, researchers from China, France and Switzerland have found that including information
about precipitation frequency may also significantly improve our ability to explain variations of moisture in summer soil.
Not exact matches
I should add too that I was not allowed at work to study or talk
about trends in
frequency and magnitude of floods or trends in temperatures and
precipitation, due to the «highly political and controversial subject of global warming».
Accordingly, there is less certainty
about the changes in
frequency and intensity of tropical cyclones on a regional basis than for temperature and
precipitation changes.
For the entire Northern Hemisphere, there is evidence of an increase in both storm
frequency and intensity during the cold season since 1950,1 with storm tracks having shifted slightly towards the poles.2, 3 Extremely heavy snowstorms increased in number during the last century in northern and eastern parts of the United States, but have been less frequent since 2000.11,15 Total seasonal snowfall has generally decreased in southern and some western areas, 16 increased in the northern Great Plains and Great Lakes region, 16,17 and not changed in other areas, such as the Sierra Nevada, although snow is melting earlier in the year and more
precipitation is falling as rain versus snow.18 Very snowy winters have generally been decreasing in
frequency in most regions over the last 10 to 20 years, although the Northeast has been seeing a normal number of such winters.19 Heavier - than - normal snowfalls recently observed in the Midwest and Northeast U.S. in some years, with little snow in other years, are consistent with indications of increased blocking (a large scale pressure pattern with little or no movement) of the wintertime circulation of the Northern Hemisphere.5 However, conclusions
about trends in blocking have been found to depend on the method of analysis, 6 so the assessment and attribution of trends in blocking remains an active research area.
2: Our Changing Climate, Key Message 5).2 Regional climate models (RCMs) using the same emissions scenario also project increased spring
precipitation (9 % in 2041 - 2062 relative to 1979 - 2000) and decreased summer
precipitation (by an average of
about 8 % in 2041 - 2062 relative to 1979 - 2000) particularly in the southern portions of the Midwest.12 Increases in the
frequency and intensity of extreme
precipitation are projected across the entire region in both GCM and RCM simulations (Figure 18.6), and these increases are generally larger than the projected changes in average
precipitation.12, 2
What the report says
about precipitation, floods, and climate change: Detectable changes in flood
frequency have occurred in parts of the United States, with a mix of increases and decreases in different regions.
The weather prediction model used in this research is advantageous because it assesses details
about future climate at a smaller geographic scale than global models, providing reliable simulations not only on the amounts of summer
precipitation, but also on its
frequency and timing.