표제지
국문요약
Abstract
목차
1. 서론 16
2. 연구 자료 및 방법 20
2.1. 연구 자료 20
2.2. 연구 방법 23
2.2.1. 수치모델 검증 23
2.2.2. Along-slope current (up) 계산[이미지참조] 24
2.2.3. Empirical Orthogonal Function (EOF) 분석 및 1st mode 유속 재구성[이미지참조] 27
2.2.4. NECBL 및 상부 수온약층 수심 계산 30
2.2.5. 상대와도 및 eddy kinetic energy (EKE) 계산 32
2.2.6. Coherence 분석을 통한 상관관계 분석 33
3. 결과 36
3.1. 심층서안경계류 관측 36
3.2. 현장관측과 수치모델 비교 38
3.3. DWBC 계절변동 42
3.4. NECBL과 상부 수온약층 수심의 계절변동 46
3.5. 심층 소용돌이와 DWBC의 계절변동 52
4. 토의 60
5. 요약 및 결론 67
6. 참고문헌 70
Table 1. Mean, and standard deviation of simulated deep currents, and correlation coefficients of currents between observation and simulation. u(σu) and v (σv) indicate the temporal mean...[이미지참조] 41
Figure 1. Bathymetry of GLORYS12V1, schematic of currents in the Philippine Sea and the location of current meter mooring (red... 22
Figure 2. Time-series of observed (a) zonal and (b) meridional velocities during 23/11/2017-08/12/2019. Raw velocities (black) are superimposed with 48-hour lowpass-filtered velocities (red). 37
Figure 3. Time series of 48-hour lowpass filtered velocity vectors from (a) observation at 4907 m and (b-e) simulation at a grid point... 40
Figure 4. (a) Map of the temporally-averaged velocity field of GLORYS12V1. The color shading indicates time-mean along-slope current and positive value means the northward flow. The gray... 44
Figure 5. (a) The first-mode EOF and (b) its principal component time series (PC1) for along-slope current (up), (c) climatological monthly mean of PC1, and (d) variance-preserving PSD of PC1....[이미지참조] 45
Figure 6. (a) Time series of NECBL. Daily NECBL derived from GLORYS12V1 (black) is superimposed by 130-day lowpass filtered NECBL (red). (b) Climatological monthly mean of NECBL. (c)... 48
Figure 7. (a) Coherence and (b) coherence phase between the NECBL and PC1 of along-slope current. The red dashed line in (a) indicates the 95% confidence level (0.51). The positive value of... 49
Figure 8. Maps of the upper thermocline depth in 2012. Each map shows upper thermocline depth field in (a) 11/04/2012, (b)... 51
Figure 9. Map of EKE calculated with reconstructed velocity (ure, vre) using the first-mode PC time series of along-slope current...[이미지참조] 54
Figure 10. (a) Time series of spatially-averaged upper thermocline depth in the area shown by the blue box in Figure 9, and (b) their climatological monthly mean. Variance-preserving PSD of (a) is... 55
Figure 11. Maps of the reconstructed velocity field (ure, vre) in 2012. Each map shows ure, and vre field in (a) 11/04/2012, (b)...[이미지참조] 58
Figure 12. (a) Time series of spatially-averaged relative vorticity in the area shown by the blue box in Figure 9, and (b) their climatological monthly mean. Variance-preserving PSD of (a) is plotted... 59
Figure 13. (a) Time series of normalized bandpass filtered NECBL (red), spatially-averaged upper thermocline depth in the blue box of Figure 9 (blue), and the first-mode EOF PC time series... 65
Figure 14. Schematic diagram explaining the seasonal variability of DWBC and its relation with NECBL, upper thermocline depth, and deep anticyclonic eddy during (a) summer and (b) winter. The... 66