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| 1 | Seasonal and inter-annual variations of Arctic cyclones and their linkage with Arctic sea ice and atmospheric teleconnections显示文摘The seasonal and inter-annual variations of Arctic cyclone are investigated. An automatic cyclone tracking algorithm developed by University of Reading was applied on the basis of European Center for Medium-range Weather Forecasts(ECMWF) ERA-interim mean sea level pressure field with 6 h interval for 34 a period. The maximum number of the Arctic cyclones is counted in winter, and the minimum is in spring not in summer.About 50% of Arctic cyclones in summer generated from south of 70°N, moving into the Arctic. The number of Arctic cyclones has large inter-annual and seasonal variabilities, but no significant linear trend is detected for the period 1979–2012. The spatial distribution and linear trends of the Arctic cyclones track density show that the cyclone activity extent is the widest in summer with significant increasing trend in CRU(central Russia)subregion, and the largest track density is in winter with decreasing trend in the same subregion. The linear regressions between the cyclone track density and large-scale indices for the same period and pre-period sea ice area indices show that Arctic cyclone activities are closely linked to large-scale atmospheric circulations, such as Arctic Oscillation(AO), North Atlantic Oscillation(NAO) and Pacific-North American Pattern(PNA). Moreover,the pre-period sea ice area is significantly associated with the cyclone activities in some regions. | WEI Lixin QIN Ting LI Cheng | 2017 | Acta Oceanologica Sinica2017，36，10： | 4 |
| 2 | 气温增暖与趋冷变化阶段江淮汛期气旋气候特征对比研究显示文摘对1948—2014年67年的江淮地区5~7月气温序列,利用EOF、功率谱和非线性映射法进行气候阶段客观划分,可分为3个时长近似的气候阶段:气温趋势下降阶段(1948—1970年)、气温趋势上升阶段(1971—1994年)和气温趋势缓升阶段(1995—2014年),它们的气候特征可用特定气温指数定量表达。其次,对各阶段江淮气旋统计特征与各阶段气温变化趋势进行对比,结果显示,气旋年平均发生频数,生命期大于48 h的气旋,各类气旋数量(深厚型,浅薄型和底层型),以及气旋路径(纬向型,经向型和打转型)的特征演变,均有明显响应阶段性气温变化的表现,阶段气温的趋冷抑制江淮气旋的活动,而阶段气温的增暖促进了气旋的发展、维持与活跃,并引导气旋位置的北进。对气旋结构特征的合成分析显示,在气旋结构中的气旋中心强度、温度梯度、气旋急流最大风速,气旋水汽通量通道的强度、长度、位置以及表征气旋斜压性的气旋冷暖气团的强度、厚度和北进南退位置等特征的演变,均与阶段内环境气温的趋冷、增暖、缓升相对应。这些结果清晰显示在环境气温下降趋冷阶段,气温变化减弱了气旋的结构强度,抑制了气旋的活跃性,在环境气温增温和缓升阶段,气温变化加强了气旋结构的稳定成长与增强,并维持了气旋的活跃性。 | 王坚红 丁晓敏 薛峰 苗春生 | 2017 | 地球科学进展2017，32，2： | 1 |
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