基于散射计风场数据的台风强度诊断方法——以海洋二号卫星数据为例   总被引：2，自引：2，他引：0  

杨典  宋清涛  蒋兴伟  刘宇昕  刘圆 《海洋学报》2019,41(1):151-159

本文提出了一种基于散射计风场数据的台风定强方法。该方法定义了台风所在海区的一个圆形区域上的风速平均值来对台风进行定强，并使用海洋二号卫星散射计历史数据对该方法进行了验证。验证结果表明，该台风定强方法可以克服散射计反演台风风速过低的问题。与台风强度监测的历史记录比较的结果显示，在台风强度低于"强台风"这一强度等级时，该方法能够有效估算台风强度。  相似文献   

The Warming and Wetting Ecological Environment Changes over the Qinghai-Tibetan Plateau and the Driving Effect of the Asian Summer Monsoon     

孙婵  徐祥德  王培娟  杨典  张胜军  王春竹  蔡雯悦 《热带气象学报(英文版)》2022,28(1):95-108

The impact of warming and wetting on the ecological environment of the Qinghai-Tibet Plateau (TP) under the background of climate change has been a concern of the global scientific community. In this paper, the optimized interpolation variational correction approach is adopted for the analysis of monthly high-resolution satellite precipitation products and observations from meteorological stations during the past 20 years. As a result, the corrected precipitation products can not only supplement the “blank area” of precipitation observation stations on the TP, but also improve the accuracy of the original satellite precipitation products. The precipitation over the TP shows different spatial changes in the vegetation growing season, known as the time from May to September. The precipitation in the vegetation growing season and leaf area index (LAI) in the following month show a similar change pattern, indicating a “one-month lag” response of LAI to precipitation on the TP. Further analysis illustrates the influence of water vapor transport driven by the Asian summer monsoon. Water vapor derived from trans-equatorial air flows across the Indian Ocean and Arabian Sea is strengthened, leading to the increase of precipitation in the central and northern TP, where the trend of warming and wetting and the increase of vegetation tend to be more obvious. By contrast, as a result of the weakening trend of water vapor transport in the middle and low levels in southern TP, the precipitation decreases, and the LAI shows a downtrend, which inhibits the warming and wetting ecological environment in this area.  相似文献   

利用贝叶斯时空模型分析山东省手足口病时空变化及影响因素   总被引：1，自引：0，他引：1  

吴北平  杨典  王劲峰  徐成东  李俊明  任周鹏 《地球信息科学学报》2016,18(12):1645-1652

手足口病是一种常见的传染病,多见于5岁以下儿童。近年来,中国手足口病发病人数逐年上升,疾病疫情也越来越受到公共卫生部门与社会大众的关注。虽然已有不少手足口病相关的研究,但对其时空变化及影响因素驱动效应的研究仍然较少。本文采用贝叶斯时空模型,对2008年山东省手足口病高发时间段（5-8月）的发病时空演变特征进行系统分析,并探究影响手足口病发病风险的气象因素。结果表明：① 空间上不同区县的手足口病发病风险存在一定差异,且区县间的发病风险随时间变化趋势也各不相同;② 5月和6月手足口病发病风险明显高于整个研究阶段（5-8月）平均发病风险;③ 对手足口病发病风险影响较大的气象因素依次是：周平均温度、平均风速和平均气压。本文针对山东省手足口病时空演化特征及气象影响因素的研究,能为高发时间段内手足口病的区域化防控提供科学依据。  相似文献