颱風不僅常常帶來嚴重的經濟損失，也危及民眾的生命安全，台灣位於颱風的好發區，颱風相關的研究十分重要，本研究以強烈颱風個數比例與影響颱風強度及個數的因素，在年際與趨勢變化兩方面進行討論。研究結果指出強烈颱風個數比例受到聖嬰的影響，使得颱風的生成位置在聖嬰年相對於正常年偏東，造成颱風在通過本研究區域的滯留時間增加，而850 hPa 風旋度場變化與強烈颱風個數比例有顯著的相關性，影響到颱風的動力，且850 hPa 風旋度場變化也反應出海表面壓力場的變化，進而影響到颱風軌跡，亦會造成颱風的滯留時間增加，使得颱風吸收到更多的颱風潛熱，故在聖嬰年，由於颱風生成位置偏東，且850 hPa 風旋度場變化值較大，故相較正常年與反聖嬰年容易形成強烈颱風。在趨勢方面，強烈颱風個數比例呈現逐年上升的趨勢，而滯留時間以及850hPa風旋度場變化皆逐漸不利於颱風發展，但颱風潛熱逐漸上升，所以在未來海洋可以提供颱風的能量也越多。而颱風個數逐年下降的趨勢，可能是與垂直風切與850 hPa 風旋度場變化有關。綜合來看，在風場的變化逐年不利於颱風發展的情況下，海洋所供給的颱風潛熱對颱風發展越來越重要。

Camargo, S. J., and Sobel, A. H. (2005). Western North Pacific tropical cyclone intensity and ENSO. Journal of Climate, 18 (15), 2996-3006.
Camargo, S. J., Robertson, A. W., Gaffney, S. J., Smyth, P., and Ghil, M. (2007). Cluster analysis of typhoon tracks. Part II: Large-scale circulation and ENSO. Journal of Climate, 20 (14), 3654-3676.
Chan, J. C., and Liu, K. S. (2004). Global warming and western North Pacific typhoon activity from an observational perspective. Journal of Climate, 17 (23), 4590-4602.
Chen, S. S., Knaff, J. A., and Marks Jr, F. D. (2006). Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries deduced from TRMM. Monthly weather review, 134 (11), 3190-3208.
Christensen, J. H., Kanikicharla, K. K., Aldrian, E., An, S.-I., Cavalcanti, I. F. A., Castro, M. d., Dong, W., Goswami, P., Hall, A., Kanyanga, J. K., Kitoh, A., Kossin, J., Lau, N.-C., Renwick, J., Stephenson, D. B., Xie, S.-P., and Zhou, T. (2013). Climate phenomena and their relevance for future regional climate change. In T. F. Stocker, D. Qin, G.-K. Plattner, M. M. B. Tignor, S. K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex & P. M. Midgley (Eds.), Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 1217-1308). Cambridge, United Kingdom and New York, NY, USA.
Emanuel, K. (2005). Increasing destructiveness of tropical cyclones over the past 30 years.Nature, 436 (7051), 686-688.
Gallina, G. M., and Velden C. S. (2002). Environmental vertical wind shear and tropical cyclone intensity change utilizing enhanced satellite derived wind information, paper presented at 25th Conference on Hurricanes and Tropical Meteorology, Am. Meteorol. Soc., San Diego, Calif.
Huang, F., and Xu, S. (2010). Super typhoon activity over the western North Pacific and its relationship with ENSO. Journal of Ocean University of China, 9 (2), 123-128.
Lin, I. I., Pun, I. F., and Wu, C. C. (2009). Upper-Ocean Thermal Structure and the Western North Pacific Category 5 Typhoons. Part II: Dependence on Translation Speed. Monthly Weather Review, 137 (11), 37744-3757.
Moon, I. J., and Kwon, S. J. (2012). Impact of upper-ocean thermal structure on the intensity of Korean peninsular landfall typhoons. Progress in Oceanography, 105, 61-66.
Palmen, E. (1948). On the formation and structure of tropical hurricanes. Geophysica, 3 (1), 26-38.
Peduzzi, P., Chatenoux, B., Dao, H., De Bono, A., Herold, C., Kossin, J., Mouton, F., and Nordbeck, O. (2012). Global trends in tropical cyclone risk. Nature Climate Change, 2 (4), 289-294.
Pun, I. F., Lin, I. I., Wu, C. R., Ko, D. S., and Liu, W. T. (2007). Validation and application of altimetry-derived upper ocean thermal structure in the western North Pacific Ocean for typhoon-intensity forecast. Geoscience and Remote Sensing, IEEE Transactions on, 45 (6), 1616-1630.
Pun, I. F., Lin, I. I., and Lo, M. H. (2013). Recent increase in high tropical cyclone heat potential area in the Western North Pacific Ocean. Geophysical Research Letters, 40 (17), 4680-4684.
Webster, P. J., Holland, G. J., Curry, J. A., and Chang, H. R. (2005). Changes in tropical cyclone number, duration, and intensity in a warming environment. Science, 309 (5742), 1844-1846.