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An overview of dry-wet climate variability among monsoon-westerly regions and the monsoon northernmost marginal active zone in China 总被引：7，自引：2，他引：5
Climate in mainland China can be divided into the monsoon region in the southeast and
the westerly region in the northwest as well as the intercross zone, i.e., the monsoon northernmost
marginal active zone that is oriented from Southwest China to the upper Yellow River, North China,
and Northeast China. In the three regions, dry-wet climate changes are directly linked to the
interaction of the southerly monsoon flow on the east side of the Tibetan Plateau and the westerly
flow on the north side of the Plateau from the inter-annual to inter-decadal timescales. Some basic
features of climate variability in the three regions for the last half century and the historical
hundreds of years are reviewed in this paper.
In the last half century, an increasing trend of summer precipitation associated with the enhancing
westerly flow is found in the westerly region from Xinjiang to northern parts of North China and
Northeast China. On the other hand, an increasing trend of summer precipitation along the Yangtze
River and a decreasing trend of summer precipitation along the monsoon northernmost marginal active
zone are associated with the weakening monsoon flow in East Asia.
Historical documents are widely distributed in the monsoon region for hundreds of years and natural
climate proxies are constructed in the non-monsoon region, while two types of climate proxies can be
commonly found over the monsoon northernmost marginal active zone. In the monsoon region, dry-wet
variation centers are altered among North China, the lower Yangtze River, and South China from one
century to another. Dry or wet anomalies are firstly observed along the monsoon northernmost marginal
active zone and shifted southward or southeastward to the Yangtze River valley and South China in
about a 70-year timescale. Severe drought events are experienced along the monsoon northernmost
marginal active zone during the last 5 centuries. Inter-decadal dry-wet variations are depicted by
natural proxies for the last 4--5 centuries in several areas over the non-monsoon region.
Some questions, such as the impact of global warming on dry-wet regime changes in China, complex
interactions between the monsoon and westerly flows in Northeast China, and the integrated multi-proxy
analysis throughout all of China, are proposed. 相似文献
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利用中国486个测站1960-2000年逐日气温观测资料，采用分层聚类和相似分析方法，对中国月、季、半年、年平均气温进行了区划，通过动态分析分层聚类过程中组内和组间平均相关系数的差异指标，为不同季节气温分析、预测研究找到适宜的分区方案。得到中国年平均气温分区为23个区；冬、夏半年均为22个区；春、夏、秋、冬季分别为24、28、26、28个区；1～12月分别为24、23、18、18、18、25、19、20、29、31、18、24个区。在全球变暖的气候背景下，各区域年、季气温在变化趋势、阶段异常、极端变化上均有明显的区域差异。 相似文献
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通过对线性和非线性，判别一回归和门限一回归、插值、距离和相似等预报方法的对比，分析了各种方法的特点及各自的局限性，并就如何改进统计预报方法提出相关建议。 相似文献
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短期降水预报的动力学与热力学 总被引：1，自引：0，他引：1
提出了当前短时和短期降水预报中需待解决的3个问题。由这些问题引发了如何把动力学与热力学相结合，如何把大量的观测和模式资料应用于短期无间隙预报的思考。最后给出了一个短期大暴雨预报的应用实例。 相似文献
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应用人工神经元网络建立临汾地区分级降水预报系统秦爱民，张临平，薛双青（临汾地区气象局０４１０００）１引言人工神经元网络就是试图以模拟人脑神经系统的组织方式构成新型的信息处理系统，其工作模式即类似于大脑的用并行分布模式取代符号定义的计算机模式。十几年来... 相似文献
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经验公式在最低气温预报中的应用戴有学，秦爱民（临汾地区气象局０４１０００）最低气温预报是日常气象要素预报中的重要项目之一。我们使用经验公式￣［１］制作了１９９１年～１９９３年最低气温预报方法，并用平均绝对误差对该方法进行评价，结果表明该方法预报最低气... 相似文献
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解决省地远程工作站改用ＮＯＶＥＬＬ网后的衍生问题薛双青，秦爱民（临汾地区气象局０１１０００）山西省建立的省地远程工作站（以下简称为ＲＷＳ）是一个很好的工作平台，大大提高了预报员的工作效率和各种预报工具的使用水平。目前，省台的网络系统由３＋网改为了ＮＯ... 相似文献