What is the impact of changes in rainfall in tropical and subtropical regions on global climate change? What is the answer?
Changes in tropical rainfall have direct social connections and cause climate change worldwide through teleconnections. Convective precipitation occurs when sea surface temperature (SST) exceeds a threshold, SSTthr, which is usually fixed in time and space. Our 40 years of monthly observations show that we find that SSTthr varies by up to 48°C. In space and with season based on the local convective instability, we develop a quantitative theory that mainly changes SSTthr using the climatological state of the tropical atmosphere. Although it is often assumed that the spatial variation of tropical upper troposphere temperature is small and can be neglected, low climatological values have been shown to favor lower SSTthr. Similarly, a small increase in climatological surface relative humidity also leads to its decrease, or climate change in tropical rainfall should include high temperatures and near-surface humidity and temperature in addition to SST and needs to be better understood. What controls their distribution in space and time. as a result ; It has a great impact on global climate change.
Andre Francisco Pogas added a reply
Precipitation changes in tropical regions play an important role in the global climate system, because such precipitation is influenced by various factors, including atmospheric circulation patterns, changes in sea surface temperature, and the presence of weather phenomena such as El Niño and La Niña. and changes in atmospheric moisture patterns.
Changes in the pattern or regime of tropical precipitation can have cascading effects throughout the global climate system. For example, a decrease in rainfall in the tropics can lead to changes in atmospheric circulation patterns and affect the distribution of heat and moisture on a global scale, thereby significantly affecting the formation of cloud systems and the occurrence of extreme weather events in affect other parts of the world. .
In addition, they can have significant consequences for tropical ecosystems, affecting biodiversity, flowering and fruiting patterns, and the availability of water resources for local communities.
Therefore, the observations presented in your question, taking into account a specific location, show changes in the mechanisms controlling tropical precipitation changes, which, in my opinion, are useful for predicting the effects of global climate change and developing effective adaptation strategies. It is of great importance.
Tropical and subtropical regions are characterized by a high atmospheric pressure field. I think that the author of the question excludes the equatorial zone of intertropical convergence from the tropical zone? Under such conditions, precipitation does not fall on land (desert areas). Over the ocean, rain falls from tropical cyclones and convective cells. The volume of precipitation is insignificant. How does this affect the planet's climate? Doesn't affect it at all. What can change the amount of precipitation? Yes, this winter we are seeing downpours, for example in Saudi Arabia... But these are changes in the weather, not climate. We know very well that in the atmosphere of tropical zones a huge amount of water is transferred from east to west. The maximum amount of water is transported over the Sahara. But conditions for precipitation occur only over the mountains (Ethiopia, Peru). The reasons are obvious. Why there are pampas instead of the desert in South America, the reason is not obvious. But there is an anomaly in the Earth's gravitational field...
Atmospheric pressure in the tropical zone decreases twice a day. This happens every 12 hours. First time in the evening. This coincidentally coincides with a decrease in air temperature. During these hours it rains over the land. The second time the atmospheric pressure drops is at lunchtime. During these hours it rains over the land.
The reason is not obvious.
What objections will there be?
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