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Why Are Recent Summers Very Hot?
Chunzai Wang, Jiayu Zheng
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
Previous studies suggest that surface air temperature variations in the Northern Hemisphere are affected by greenhouse effect, El Niño-Southern Oscillation, the North Atlantic Oscillation, and so on. However, the recent summers of 2017, 2018 and 2019 in the Northern Hemisphere are still very hot even without the variations such as El Niño-Southern Oscillation and the North Atlantic Oscillation. Here we identify seven atmospheric circulation patterns by using atmospheric teleconnection method, and find that a combination of these identified atmospheric circulation patterns and global warming explains summer surface air temperature variations in the Northern Hemisphere. Our results also suggest that accurate forecast of the atmospheric circulation patterns can help to predict the summer surface air temperature in the Northern Hemisphere.