排序方式： 共有9条查询结果，搜索用时 31 毫秒
1
1.
利用1958—2000年NCEP/NCAR再分析资料和华南测站降水资料,分析了大气热源30～60 d振荡对华南6月旱涝的影响。结果表明,在涝(旱)年对流层低层,南海至日本东南面的西北太平洋(WNP)是一个异常的低频反气旋(气旋),伴随有异常的低频热汇(热源)区,华南至日本南部存在一个异常气旋(反气旋),对应于异常的低频热源(热汇)区,华南地区低层异常辐合(辐散);平均而言,旱年华南5—6月30～60 d振荡的位相演变要比涝年的偏晚约7～11天;涝年,低频热源和气旋从南海南部北传和从西太平洋暖池区西北传,以及从140°E附近WNP的西传都十分明显,它们对华南6月降水偏多有非常重要的影响。而旱年南海及邻近区域的低频热源和气旋北传较涝年偏晚,WNP上低频热源的西伸不明显。前期南海低频热源推进的迟早以及热带WNP上的低频热源是否西传对华南6月的降水有显著影响。 相似文献
2.
本文对门源区域1970年以来的地震目录及2016年1月21日门源6.4级地震的地震序列、余震分布、不同时段完整震级、b值、地震周期特征等方面进行分析探讨.分析认为该区域的5级以上中强震多发生于b值的下降时段,中等地震存在3～5年的周期特征,6级以上地震的周期约为20年;本次6.4级的地震序列表明,余震密集发生于震后的10余天内,这个时段余震频次达到了5个月以来地震总数的85%以上.主震发生后,随着余震的增多,a值、b值都有上升的迹象,这表明区域应力状态得到了一定缓解,当b值趋于稳定时,可能预示着地震序列将进入结束状态.运用该区域主震前的地震目录分析计算发现,本次6.4级地震就发生在a值高值区及b值低值区,显示空间b值对本次强震的发生地点具有一定的指示意义. 相似文献
3.
RELATIONSHIP BETWEEN THE 30 TO 60 DAY OSCILLATION OF ATMOSPHERIC HEAT SOURCE AND THE DROUGHT AND FLOOD EVENTS IN JUNE IN THE SOUTH OF CHINA 总被引：2，自引：1，他引：1
Based on the NCEP/NCAR reanalysis data and the observed precipitation data in the south of China from 1958 to 2000,the impact of 30 to 60 day oscillation of atmospheric heat sources on the drought and flood events in June in the south of China is discussed.During the flood(drought) events,there exists an anomalous low-frequency anticyclone(cyclone) at the low level of the troposphere over the South China Sea and the northwestern Pacific,accompanied with anomalous low-frequency heat sinks(heat sources),while there exists an anomalous low-frequency cyclone(anticyclone) with anomalous heat sources(sinks) over the area from the south of China to the south of Japan.On average,the phase evolution of the low-frequency in drought events is 7 to 11 days ahead of that in flood events in May to June in the south of China.In flood events,low-frequency heat sources and cyclones are propagated northward from the southern South China Sea,northwestward from the warm pool of the western Pacific and westward from the northwestern Pacific around 140°E,which have very important impact on the abundant rainfall in June in the south of China.However,in drought events,the northward propagations of the low-frequency heat sources and cyclones from the South China Sea and its vicinity are rather late compared with those in flood events,and there is no obvious westward propagation of the heat sources from the northwestern Pacific.The timing of the low-frequency heat source propagation has remarkable impact on the June rainfall in the south of China. 相似文献
4.
北京正处于快速老龄化阶段,随着城市化进程的加深,迁移老年人的生活环境发生着剧烈的变化。分析北京市城市功能拓展区中老年人的迁移意愿及其影响因素,具有重要的实践意义。选择北京城市功能拓展区中4个新建小区为案例区,收集有效调查问卷353份,采用描述性统计和Logistic回归研究北京市老年人口的迁移意愿及其影响因素。研究发现：已迁移老年人中,71.4%的老年人愿意迁移。与子女居住距离的变化、孙辈的出生以及居住条件的改善是自主迁移老年人迁移的主要原因。老年人生命历程的变化对迁移行为有重要影响。老年人的身体健康、经济条件、与子女居住距离和居住环境对其迁移意愿影响显著。本文的研究意义在于结合老年人迁移的影响因素与宜居社区建设政策,为构建老年宜居社区提供科学依据。 相似文献
5.
Multi-scale contributions are involved in the South China Sea (SCS) summer monsoon (SCSSM) onset process. The relative roles of intraseasonal oscillation and above-seasonal component in the year-to-year variation of the SCSSM onset are evaluated in this study. The 30-90-day and above-90-day components are major contributors to the year-to-year variation of the SCSSM onset, and the former contributes greater portion, while the 8-30-day component has little contribution to the onset. In the early onset cases, the 30-90-day westerly winds move and extend eastward from the tropical Indian Ocean (TIO) to the SCS monsoon region relatively earlier, and replace the easterly winds over the SCS with the cooperation of the 30-90-day cyclone moving southward from northern East Asia. The westerly anomalies of the above-90-day component in spring jointly contribute to the early SCSSM onset. In the late onset cases, the late eastward expansion of 30-90-day westerly wind over the TIO, accompanied by the late occurrence and weakening of the 30-90-day anticyclone over the SCS, and its late withdraw from the SCS, as well as the persistent easterly anomalies of above-90-day component, suppress the SCSSM onset. However, the SCSSM outbreaks in the obvious weakening stage of 30-90-day easterly anomalies. The easterlies-to-westerlies transition of the 30-90-day 850- hPa zonal wind over the SCS in spring is closely associated with sea surface temperature in the tropical western Pacific in preceding winter and spring, while the interannual variation of the above-90-day zonal wind in April-May is closely related to the decaying stage of the El Ni?o-Southern Oscillation events. 相似文献
6.
The interdecadal change in the interannual variability of the South China Sea summer monsoon(SCSSM) intensity and its mechanism are investigated in this study. The interannual variability of the low-level circulation of the SCSSM has experienced a significant interdecadal enhancement around the end of the 1980s, which may be attributed to the interdecadal changes in the evolution of the tropical Indo-Pacific sea surface temperature(SST) anomalies and their impacts on the SCSSM. From 1961 to 1989... 相似文献
7.
利用云分辨天气研究和预报模式（CR-WRF）模拟在清洁大气和污染大气下,气溶胶的云凝结核作用对不同强度南海热带气旋（TC）的强度变化影响,对比分析了动力结构和微物理结构的变化。(1)在污染大气环境中,更多气溶胶能进入到弱TC内部云带区,并充当凝结核作用,TC内部各相态水凝物含量都有明显增多, 释放潜热有利于TC内部的对流发展,弱TC中心海平面气压下降,强度加强。（2）在污染大气环境中,气溶胶主要影响强TC的外部螺旋云带区;外部云带区各相态水凝物增多,释放潜热有利于该处对流的发展;外部云带区对流与云墙区内对流形成竞争,导致入流减弱,云墙区内上升运动减弱,强TC中心海平面气压上升,强度减弱。 相似文献
8.
利用近震深度震相sPL的基本特征和门源地震台、铧尖地震台的波形资料,对2016年1月21日青海门源Ms6. 4级地震序列中的15个ML≥3. 0级地震进行了sPL震相分析,得到了该地震序列较为可靠的震源深度结果,并与Hyposat定位结果和CAP波形反演的结果进行对比,发现sPL震相测定的震源深度结果与Hyposat定位结果和CAP波形反演得到的结果有很好的一致性,表明sPL震相测定的震源深度是可信的。 相似文献
9.
华南夏季大气水汽汇时空变化特征 总被引：3，自引：19，他引：3
用1958~2004年NCEP/NCAR再分析资料,分析华南夏季大尺度大气水汽汇的时空变化特征。结果表明:西南地区东部至华南北部地区、华南沿海地区是我国南方夏季水汽汇的2个主要的变异中心区。西南地区东部至华南北部地区夏季水汽汇具有明显的年代际变化特征。华南南部沿岸地区夏季水汽汇则以年际变化为主。西南地区东部至华南北部附近地区以及华南南部沿岸地区水汽汇的强弱异常变化,与东亚上空水汽输送异常而导致上述地区的垂直积分的水汽通量辐合的异常是密切相关:如果向华北或者长江流域的水汽输送增强(减弱),则华南地区得到的水汽减少(增加),导致上述地区上空的水汽汇偏弱(偏强)。 相似文献
1