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东海及邻近地区百年来的温度变化 总被引:9,自引:6,他引:9
东海是紧邻我国大陆的西北太平洋边缘海之一,由于处在大陆和大洋的交绥地带,陆-海-气相互作用相当强烈.揭示有关东海气候长期变化规律,不仅是东海海洋生态环境及渔业资源研究的主要课题,而且对于陆上气候变化研究和预测有着重要意义. 相似文献
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Tropical cyclones which rapidly intensify (ΔV≥ 20 m/s in 24 h)in the Northwest Pacific Ocean west of 135°E could have adverse influence on oceanic and coastal economic activities in China, 71% of which land in China. Rapid intensification is mostly seen east and northeast of the Luzon Island. It is much correlated with sea surface temperature(≥28℃)and upper air conditions, such as enhanced subtropical high, onset of Southwest monsoon surge, invasion of modest cold air, and Tropical Upper Tropospheric Trough(TUTT) etc. Abovementioned processes enhance inflows in the low level and deep convection in the area of inner core. Statistics of satellite pixels have confirmed that rapidly intensifying tropical cyclones are marked by a sharp increase in the inner core convection and stable or slowly-increasing deep convection in outer region. Non-rapidly intensifying tropical cyclones have only constant or decreased deep convection in inner core and outer region. The sharp increasing of deep convection in the inner core and the rapid warming in its upper level is a forewarning of rapid intensification of tropical cyclones. 相似文献
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为了科学评价城市地震灾害状况,降低城市易损性,基于压力-状态-响应模型框架,构建城市地震综合易损性评价指标体系,其中压力类、状态类、响应类指标分别为7、13、8项。应用熵权法确定了各评价指标的权重,提出基于云模型的城市综合易损性评价模型,并运用雷达图分析法实现城市内各个区综合易损性的相对高低。应用上述方法,对兰州市中心城区进行了震害综合易损性评价,结果表明:兰州市综合易损性等级偏向Ⅲ级,易损性中等,其中红古、安宁区的易损性程度较高,城关、七里河易损性程度较低;经济因素对各区域的易损性影响较大,通过对易损区域加强管理建设,提高城市的防震减灾能力。 相似文献
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