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Recurrent Pattern of Extreme Fire Weather in California
Rackhun Son,Shih-Yu (Simon) Wang,Seung Hee Kim,Hyungjun Kim,Jee-Hoon Jeong,Jin-Ho Yoon 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
Historical wildfire events in California have shown a tendency to occur every five to seven years with a rapidly increasing tendency in recent decades. This oscillation is evident in multiple historical climate records, some more than a century long, and appears to be continuing. Analysis shows that this 5-7-year oscillation is linked to a sequence of anomalous large-scale climate patterns with an eastward propagation in both the ocean and atmosphere. While warmer temperature emerges from the northern central Pacific to the west coast of California, La Niña pattern develops simultaneously, implying that the lifecycle of the El Niño-Southern Oscillation that takes multiple years could be a trigger. The evolving patterns of the Pacificto-North America atmospheric teleconnection suggest the role of tropical and subtropical forcing. These results highlight the role of the hydrological cycle coupled with a semi-cyclical behavior as a climate driver for wildfire variability in California.
Warmer and Less Icy Arctic Leading to More Violent Weather in Midlatitudes
Yungi Hong,Shih-Yu (Simon) Wang,Qinghua Ding,Seok-woo Son,Jee-Hoon Jeong,Sangwoo Kim,Jin-Ho Yoon 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
Today, East Asia and North America still have experienced extreme cold although global warming gets stronger. However, its mechanism of such extreme cold in winter is not demonstrated. Arctic amplification (AA) is regarded as one of the causes of Warm Arctic Cold Eurasia (WACE). In this study, the relationship between the Arctic and midlatitude temperature is analyzed using reanalysis data. Most years show negative correlation but large uncertainty is in terms of its intensity. Furthermore, using Half a degree additional warming, prognosis and projected impacts (HAPPI) experiment, global warming impact on the association between the Arctic and midlatitude is estimated. Under the global warming scenario, the warmer Arctic makes the range of temperature response in the midlatitude wider. It means the Arctic-midlatitude teleconnection becomes loose, leading to less predictable weather in the future.