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The interannual variability of near-coastal eastern North Pacific tropical cyclones is described using a data set of cyclone tracks constructed from U.S. and Mexican oceanic and atmospheric reports for the period 1951-2006. Near-coastal cyclone counts are enumerated monthly, allowing us to distinguish interannual variability during different phases of the May-November tropical cyclone season. In these data more tropical cyclones affect the Pacific coast in May-July, the early months of the tropical cyclone season, during La Niña years, when equatorial Pacific sea surface temperatures are anomalously cool, than during El Niño years. The difference in early season cyclone counts between La Niña and El Niño years was particularly pronounced during the mid-twentieth century epoch when cool equatorial temperatures were enhanced as described by an index of the Pacific Decadal Oscillation. Composite maps from years with high and low near-coastal cyclone counts show that the atmospheric circulation anomalies associated with cool sea surface temperatures in the eastern equatorial Pacific are consistent with preferential steering of tropical cyclones northeastward toward the west coast of Mexico. 相似文献
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This study evaluates impacts from tropical cyclone (TC) landfalls on populated areas located along the Pacific Ocean coast of Mexico. The period of interest is from 1970 through 2010 and an international disaster database is used to identify the impact from the landfalling TCs. More than 30 landfall events occurred during the period; we examined the top 25 TCs based on rainfall accumulation, as well as the top 10 TC-related disasters based on the affected population. Each event resulted in affected population from 20 000 to more than 800 000. Strong winds and heavy rainfall, during periods of one to three days, are associated with property damage and loss of lives. Our results indicate that excessive rainfall accumulations and daily rates, over highly populated areas, are important elements associated with the occurrence of disasters. Six of the top 10 TC-related disasters occurred during El Niño and three during neutral conditions; however, looking at the top 25 events, 10 occurred during El Niño and 10 during neutral conditions. Three case studies that occurred during El Niño events (Liza in 1976, Pauline in 1997, and Lane in 2006) are documented in more detail as they affected areas with different population densities in the southern and northwestern coasts of Mexico. 相似文献
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1999年我国天气气候特点 总被引:6,自引:1,他引:5
1999年我国主要天气气候特点可概括为:大部地区冬春连旱,夏季南涝北旱,秋季旱渍并存。全国持续偏暖,但幅度已较1998年有所下降,而且阶段性变化也更趋明显,部分地区遭受了高温或低温霜冻危害。热带风暴生成和登陆我国的个偏省;沙尘暴异常偏早;风雹偏省,损失轻;雾日较多。 相似文献
87.
青藏高原东部积雪与影响福建的热带气旋频数 总被引:1,自引:1,他引:0
应用青藏高原东部17个测站1957~1988年秋冬季(11~2月)平均积雪深度及积雪日数资料,分析了积雪深度及积雪日数异常年夏季500hPa高度场的不同分布形态,同时对照登陆及影响福建的热带气旋偏多年及偏少年500hPa高度场的分布特征,得出青藏高原秋冬季积雪深度偏小(大)年夏季热气旋频数偏多(少),而积雪日数偏多年,夏季热带气旋频数偏少。 相似文献
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中国登陆热带气旋与太平洋海表温度的关系 总被引:16,自引:0,他引:16
根据1951~2000年中国登陆热带气旋与厄尔尼诺年、拉尼娜年的关系分析,得到了一些重要认识:(1) 在厄尔尼诺年,中国登陆热带气旋数偏少;(2) 厄尔尼诺事件强度越大,中国登陆热带气旋数越少;(3) 厄尔尼诺事件的结束时间若超过5月1日,那么次年中国登陆热带气旋数偏少;(4) 中国登陆热带气旋数的特多年主要集中在拉尼娜年;(5) 在拉尼娜次年,中国登陆热带气旋数偏少;(6) 中国登陆热带气旋强度越大,在厄尔尼诺年出现机会越少;(7) 在厄尔尼诺年,中国初旋偏迟,终旋偏早。同时对其机理进行了探讨。 相似文献
90.
刘春霞 《热带气象学报(英文版)》2004,10(1):79-86
1 INTRODUCTION It is doubtless that TCs making landfalls on Guangdong are one of the important aspects of the research on and prediction of short-term climate changes for the province. With regard to the climate patterns of TCs motion and factors governin… 相似文献