표제지
국문요약
Abstract
목차
1. 서론 14
2. 자료 및 방법 20
2.1. 자료 20
2.2. 방법 23
2.2.1. 연구해역 23
2.2.2. Tropical cyclone heat potential (TCHP) 계산 및 자료 검증 23
2.2.3. PDO에 따른 태풍 강화와 TCHP의 변동 및 상관관계 분석 25
2.2.4. 태풍 전후의 TCHP 변화 분석 26
3. 결과 28
3.1. 수치모델 자료와 관측 자료의 비교 28
3.2. 해수면 높이와 TCHP 비교 31
3.3. PDO에 의한 TCHP 변동 34
3.4. TCHP와 태풍 강화의 상관성 41
3.5. PDO에 따른 태풍의 강화 46
4. 토의 51
5. 요약 및 결론 55
6. 참고문헌 57
Table 1. Statistical data on typhoon frequency per month between 1993 and 2020. 22
Figure 1. (a) Monthly PDO index during 1993-2021, superimposed by 1-year moving-averaged PDO index (black). Horizontal dashed... 18
Figure 2. Hovmöller diagrams of satellite altimetry ADT annual climatology during (a) all period, (b) positive PDO phase period, and (c) negative PDO phase period. 19
Figure 3. (a) Bathymetry of North West Pacific Ocean. A1 (black dashed box) and A2 (magenta dashed box) is the location of the... 27
Figure 4. Scatter plots of ARGO-measured TCHP vs. (a) GLORYS-simulated TCHP, and (b) HYCOM-simulated TCHP.... 30
Figure 5. Time series comparisons between (a) SSH and TCHP, and (b) SSH and OHC from GLORYS data. The correlation coefficients... 32
Figure 6. Scatter plots of (a) ARGO-measured TCHP vs. satellite altimetry-measured SSH, and (b) TCHP vs. SSH simulated by... 33
Figure 7. (a) Monthly PDO index (gray) during 1993-2020, superimposed by 1-year moving-averaged PDO index (black). Horizontal... 37
Figure 8. Hovmöller diagrams of TCHP annual climatology calculated using GLORYS data during (a) all period, (b) positive PDO phase period, and (c) negative PDO phase period. 38
Figure 9. TCHP maps in summer (June to August) during (a) positive PDO periods, and (b) negative PDO period. (c) Difference... 39
Figure 10. TCHP maps in summer (June to August) during (a) strong positive PDO period, and (b) strong negative PDO period. (c)... 40
Figure 11. Scatter plots of TCHP and Vmax gradient. (a) includes all tropical cyclones, and (b) includes only Typhoons (Vmax ≥... 43
Figure 12. Correlation maps between TCHP and Vmax gradient. Left panel (a) includes all tropical cyclones, and right panel (b) includes only Typhoons (Vmax ≥ 64 knots). The correlation... 44
Figure 13. Scatter plots of TCHP and Vmax gradient during (a) strong PDO positive case and (b) strong PDO negative case.... 45
Figure 14. Proportion maps of typhoon intensification during (a) PDO positive phase and (b) PDO negative phase. Ratio values are shown in 5ᐤ x 5ᐤ boxes, and the number of samples (N) in the box is... 47
Figure 15. Scatter plot of PDO index vs. Vmax gradient. Expanded figure of (a) is shown in (b). Blue, and red dots indicate cases of... 48
Figure 16. Background maps of TCHP difference between 1 day after and 1 day before the typhoon passage during (a) strong positive PDO phase and (b) strong negative PDO phase periods.... 50