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西太平洋暖池热含量年际变化及其对东亚气候异常的影响 总被引：2，自引：0，他引：2
利用1980—2010年共31个冬季的GODAS海洋同化资料,以5～366 m次表层海温构造西太平洋暖池区域的热含量,分析了冬季西太平洋暖池次表层热含量的时空特征、持续性以及对其邻近区域的气候异常影响,结果表明:(1) 整体一致性分布是冬季西太暖池区次表层热含量年际变化的主导模态,其时间系数的年际振荡较好地代表了暖池区次表层热状况的年际异常。暖池区热含量的变化与ENSO事件联系密切,它能保持超前两季以上的显著自相关,持续性较赤道中东太平洋海温异常更为稳定。(2) 冬季暖池区热含量异常对后期春、夏季暖池热状况产生持续影响,相应的暖水体积变化导致暖水的经向输送及垂直交换,对后期春夏两季暖池及邻近区域尤其是菲律宾海的表层海温、海表热通量变化有较大影响。(3) 冬季暖池区热含量上升对应春季菲律宾海以东洋面OLR数值下降以及降水偏多,所引起的对流活动加热异常导致热带及副热带西北太平洋位势等压面抬升,进而对西太副高产生影响。之后,此区域相应的海表热通量交换加强,对流层低层形成强大的异常气旋,海气相互作用加强,加上对流加热异常,使得冬季暖池热含量异常与夏季副热带高压变化联系更加紧密。因此冬季暖池区热含量可作为春、夏季西太副高变化和西北太平洋夏季风强度的有效预测因子。 相似文献
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Using the 1980-2010 winter GODAS oceanic assimilations, study is conducted of the winter heat content (HC) established in the subsurface layer (5 to 366 m in depth) over the western Pacific warm pool (WP), followed by investigating the HC spatiotemporal characteristics, persistence and the impacts on the climate anomalies of neighboring regions. Results are as follows: 1) the pattern of integral consistency is uncovered by the leading EOF1 (PC1) mode of HC interannual variability, the year-to-year fluctuation of the time coefficients being well indicative of the interannual anomaly of the WP winter subsurface-layer thermal regime. The HC variation is bound up with ENSO, keeping pronounced autocorrelation during the following two seasons and more, with the persistence being more stable in comparison to SSTA in the equatorial middle eastern Pacific; 2) the winter HC anomalies produce lasting effect on the WP thermal state in the following spring and summer and corresponding changes in the warm water volume lead to the meridional transport and vertical exchange of warm water, which exerts greater impacts upon the sea surface temperature/heat flux over the warm pool per se and neighboring regions, especially in the Philippine Sea during the posterior spring and summer; 3) the increase in the winter HC corresponds to the spring OLR decrease and richer precipitation over the waters east to the Philippine Sea and the resultant convective heating anomalies are responsible for the rise of geopotential isobaric surfaces over tropical and subtropical western North Pacific, thereby producing effect on the western Pacific subtropical high (anomaly). Subsequently, the sea-surface heat flux exchange is intensified in the warm pool, a robust anomalous cyclone shows up at lower levels, air-sea interactions are enhanced and abnormal convective heating occurs, together making the winter HC anomalies even more closely associated with the variation in the summer subtropical high. As a result, the WP winter HC can be used as an effective predictor of the variation in spring/summer western Pacific subtropical high and the strength of summer monsoon over the northwestern Pacific. 相似文献
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测绘业务信息化管理是信息化测绘体系建设的一个重要方面。以湖北省信息化测绘建设项目为例,结合湖北省信息化测绘体系建设经验,面向测绘生产业务管理,分析了当前测绘生产业务管理中存在的问题,探讨了省级测绘生产业务管理信息系统的总体目标与架构、数据库设计、功能设计以及关键技术,并论述了系统运行与实现过程。该成果对于其他省份开展信息化测绘体系建设具有一定的借鉴意义。 相似文献
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近年来,降雨诱发的滑坡灾害日益频繁,给人民生命财产安全造成了严重的威胁。因此,深入开展滑坡灾害气象预警研究具有重要的理论意义和实用价值。为了解决传统滑坡灾害气象预警方法在计算性能和预警精度等方面的不足,本文立足于滑坡灾害气象预警工作,选取汶川M s 8.0级强烈地震重灾区的62县市为研究区,深入分析研究区滑坡灾害与地质环境、降雨之间的关联关系,构建适用于研究区的滑坡因子指标体系,运用机器学习理论和方法,建立了基于机器学习的滑坡灾害气象预警模型,并利用研究区历史监测数据进行试验,验证了该方法的准确性和可靠性。 相似文献
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