Scientific research has found that precipitation variability increases with climate warming, but why is there not much rain in summer?

The division of average precipitation state and the precipitation change form of variable rate change. Color is the ratio of precipitation variability change to average state change.

Zhang Wenxia, an associate researcher at lasg LASG State Key Laboratory, and other experts and scholars from the British Meteorological Office collaborated to publish a paper on "Precipitation variability will increase with climate warming" in Science Progress, emphasizing that with climate warming, the global humid areas (including subtropical areas, monsoon areas and mid-high latitudes) will become more and more humid due to the increase of total precipitation, and the distribution of precipitation in duration will become more and more asymmetric, and the ups and downs of humid areas will become more intense.

"For most parts of the world, the increase in precipitation variability represents that global warming has made or will make the climate system software more diverse and asymmetric. This is consistent with the frequent occurrence of floods and droughts that everyone has experienced in the past two decades from global to regional limits. " Zhou Tianjun, correspondent and researcher of lasg, told China Science News that a more "moody" climate in the future will definitely pose new challenges to the solution of climate change.

With the warming of climate and the improvement of air water-holding capacity, the global water circulation system will be continuously improved. On a global scale, this is mainly manifested in the increase of total precipitation and the increase of precipitation extreme value. At the same time, the change of precipitation variability is a key part of the change of water cycle system, but in the past, international scientific and technological circles paid little attention to it.

Precipitation variability refers to the possible fluctuation or impact category of precipitation. The greater the variability, the more frequent the occurrence of abnormal precipitation, the stronger the climate asymmetry, the stronger the extreme things, and the greater the harm to people's livelihood projects and social and economic development. In the climate warming environment, the change of precipitation variability will directly affect the social development and the climate resilience of the ecosystem, which is a key step that must be considered in the climate change solution.

In this scientific research, the response of multi-scale precipitation variability from air temperature to interannual limit to global warming is studied by using the main parameter oscillation sample of the British Meteorological Office and combining with the simulation and prediction of experimental results. The results show that with global warming, precipitation variability will increase in all time and frequency domains, such as the temperature is limited to months, seasons and years. The change of precipitation variability presents the characteristics of global non-uniform distribution, and the key to its improvement lies in humid climate, so the change of precipitation variability is reflected as "the variability in arid areas is stronger"

If the global temperature rises by 65438 0℃, the global average precipitation variability will increase by about 5%, which is about twice the average precipitation variability. In terms of physical system, scientific research clearly puts forward a concise diagnosis method of driving force, and finds that the increase of precipitation variability is mainly caused by the increase of air water vapor composition caused by temperature rise, and the heating effect is relatively symmetrical around the world.

Secondly, the discrete system effect of the common change of water vapor and electric field also promotes the increase of precipitation variability, which is related to the feedback between vertical fitness exercise and the release of solidification vaporization heat. On the other hand, the driving force effect reduces the precipitation variability, which is also caused by the weakening of electric field variability in the warming environment.