What impact will drought risk warming have on stormwater resources?
Do you know how warming will affect our water resources? March 23 is Meteorological Day, and this year's theme is 'Climate and Water'. We all know that climate and water are closely related to people's lives, but what is the relationship between them? Under the background of warming, what changes will happen to water resources? The drier gets drier, the wet gets wetter 'A suitable climate and an appropriate amount of water resources are necessary conditions for people's production and life, which is often referred to as good weather.' Xiao Chan, senior engineer of the Climate Service Office of the Climate Center, said in an interview with a reporter from Science and Technology Daily , if the range of weather and climate changes exceeds the upper or lower limit of normal fluctuations, there will be extreme weather and climate events, and the occurrence of extreme events is often accompanied by greater social impact. Taking precipitation as an example, too much precipitation will bring torrential rain and floods, endangering houses, land, farmland and even life, while too little precipitation will bring drought, affecting crop growth and even drinking water for humans and animals. Climate change is changing water resources in the United States and China. Take, for example, under the influence of climate change, the climate zone is changing, and the main feature is that the ascending movement in the tropics is strengthening, and the sinking movement in the subtropical region is also strengthening. To put it simply, places with a lot of precipitation have more precipitation, while subtropical dry and rainless areas have reduced precipitation. 'It's called drier getting drier and wetter getting wetter, which is the main feature of water resource changes caused by climate change.' Humidity is also increasing, more humid. Xiao Chan also believes that climate warming will seriously affect precipitation. A large number of observational data show that the middle and high latitudes and tropical regions generally show a trend of increasing precipitation, while the subtropical regions generally show a trend of decreasing precipitation. In this way, dry places get drier and wet places get wetter. The western region of my country is getting warmer and wetter. 'The precipitation in our country has also been increasing since 1961, which is in line with the result of climate change affecting the water cycle.' The degree of drought is weakening, and most areas are warming and wetting, that is, warming and humidification. Of course, it's not that it's changing the climate, it's just that precipitation and humidity are increasing. In addition, it is a monsoon climate, and the distribution and advancement of the monsoon will affect the change of the rain belt. Observation data shows that my country's monsoon region is flooded in the south and drought in the north, with more precipitation in the south and less precipitation in the north. This will cause a shortage of water resources in the north, that is, the monsoon region is flooded in the south and drought in the north. In this regard, my country's response measures are South-to-North Water Diversion, which is also an effort to adapt to climate change. 'Generally speaking, it is the same and different from regional water resource changes. The same thing is that precipitation is increasing. But from a regional perspective, my country's eastern monsoon region is flooded in the south and drought in the north, and the west is warm and humid. In addition to being affected by climate change, it is also affected by natural factors.'. In Xiao Chan's view, climate warming will also lead to changes in precipitation structure. Taking my country as an example, in the past 50 years, the annual average rainy days in my country have generally shown a downward trend, mainly because the number of light rain days has decreased significantly (the number of light rain days has decreased by 13%), while the number of heavy rain days has not only not decreased, but has shown an increasing trend (increased by 10%) ). A decrease in the number of rainy days, especially light rainy days, means an increase in the risk of drought, while an increase in the number of heavy rain days means that the frequency of short-duration heavy precipitation events is increasing, and the risk of urban waterlogging will increase. Every summer, many cities lead to 'watching the sea mode' due to heavy precipitation, which is a manifestation of the increase in precipitation-related extreme events under the background of warming. Human activities have a great impact on warming. Therefore, experts suggest that everyone should start from themselves, save energy and reduce emissions, and care for the environment.