Response of atmospheric blocks to the arctic amplification in the idealized model experiments

• Main Author: Yeong-Eun Yoo
• Other Authors: 손석우, 유영은, 자연과학대학 지구환경과학부
• Format: Thesis
• Language: English
• Published: 서울대학교 대학원 2017
• Subjects: Arctic amplification; jet; atmospheric block; 550; Arctic
• Online Access: http://hdl.handle.net/10371/131443

학위논문 (석사)-- 서울대학교 대학원 : 지구환경과학부, 2017. 2. 손석우. This study explores the responses of jet and atmospheric blocks to Arctic amplification (AA) in a simple atmospheric general circulation model. External heat is forced in the pole to mimic the AA. As the temperature increases in the pole, it changes the eddies, especially in midlatitudes, and the jet moves towards the equator. Meanwhile, the storm track moves equatorward along with the jet. We do not confirm that the jet gets wavier while in the midlatitudes where the jet gets stronger, whereas it is identified that the jet gets wavier at high latitudes. Though the jet gets weaker and wavier in high latitudes, no clear blocking increase is found. Rather, blocks are shown to increase in the midlatitudes, regarded as in relation to the equatorward shift of the storm track. 1. Introduction 1 2. Model configurations 4 2.1. Equilibrium experiments 4 2.2. Transient experiment 6 3. Methods 8 3.1. Waviness index 8 3.2. Blocking index 9 4. Results 11 4.1. Response of jet 11 4.2. Response of waviness 14 4.3. Response of blockings 14 5. Conclusions 17 6. Further studies 18 References 19 Table 24 초록 33 Master