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利用6 h一次、水平分辨率为0.25°×0.25°的ERA-Interim再分析资料,对1979—2016年生成于四川盆地的西南涡的发生和发展进行统计分析。结果表明:四川盆地低涡集中生成于盆地内;在6月生成最多,7月发展最强;按移动情况不同可将其分为5类:东移型、东北移型、东南移型、西移型和少动型;东移型、东南移型、少动型低涡生成个数的峰值在6月,东北移型和西移型低涡生成个数的峰值在7月。
海洋和冰冻圈变化有关的极端事件、突变及其影响与风险
海洋 冰冻圈 极端事件 风险管理
2020/7/17
《气候变化中的海洋和冰冻圈特别报告》(SROCC)于2019年9月在IPCC第一工作组和第二工作组第二次联合大会上得到审议通过,并得到了IPCC第51届全会接受和批准。
利用重建的华南区域黑碳气溶胶(BlackCarbon,BC)浓度资料,分析其与南海夏季风在年际尺度上的关系。结果表明,华南区域BC浓度与南海夏季风的关系在2000年前后有明显的突变,由显著负相关变为显著正相关,即由高BC浓度弱季风变为高BC浓度强季风。通过合成对比分析,发现1988—1999年(第一时间段)的华南BC主要气候效应是间接辐射强迫作用:华南BC使云粒子半径减小,抑制华南区域春季降水,增...
SYNOPTIC OBSERVATIONS OF CALVING EVENTS IN ANTARCTICA USING SPACEBORNE IMAGES
Antarctica Calving Optical Images Rifts Icebergs
2019/2/28
Iceberg calving is the detachment of ice from ice shelves or glaciers. Although calving is a natural phenomenon, an abnormal rate of calving can be a threat to ice shelves. Some of the events were so ...
WIND SHEAR IDENTIFICATION WITH THE RETRIEVAL WIND OF DOPPLER WEARTH RADAR
Wind shear Doppler weather radar Conventions Wind field retrieval Guangzhou
2018/5/17
A new method, which based on the wind field retrieval algorithm of Volume Velocity Process (VVP), has been used to identified the intensity of wind shear occurred in a severe convection process in Gua...
气象条件对2013—2015年冬季关中地区空气质量的影响
天气形势 空气质量 细颗粒物 关中地区
2019/1/16
大气污染是由过度的人为源排放和不利于大气污染扩散的气象条件共同作用的结果,通过探讨天气形势及气象要素与细颗粒物(PM2.5)的关系,分析气象条件对空气质量的影响,从而为关中地区的环境治理提供有利的参考依据。本文利用NCEP-FNL再分析资料、环境监测资料及有关的降水数据,对2013 — 2015年冬季关中地区空气质量的演变趋势及其与气象条件的关系进行了研究。结果表明:201...
为了探讨暴雪天气的成因和机理,为暴雪预报提练技术指标,本文利用常规气象观测资料和micaps资料,对 2015 年 11月 5-7日出现在山西北中部的暴雪天气过程进行了诊断分析,结果表明:(1) 暴雪产生在高低纬冷暖气流相互作用下的有利背景下,地面倒槽与回流共同作用的形势中,冷空气从高压中分裂南下在东北平原堆积是回流形成的机制。(2)低空、超低空急流的维持和叠置,为暴雪的出现提供了充沛的水汽。水汽...
开发高性能的磁流体力学数值模拟方法是提高空间天气数值预报研究的一个重要方面.有限体积法的逆风分裂格式具有良好的间断捕获能力,Steger-Warming和AUSM(Advection Upstream Splitting Method)是逆风分裂格式FVS(Flux Vector Splitting)方法中具有代表性的两种格式.采用这两种格式求解具有伽利略不变性的扩展型广义拉格朗日乘子磁流体力学(...
在利用常规观测资料统计分析2000—2011年和沙尘天气多发年河西走廊入口区代表站点春季风速分布特征的基础上,采用区域气候模式(Regcm4.3.5.6)和欧洲中心更新的4DVar同化的ERA-interim资料,分析了河西走廊入口区下垫面类型改变对2007年4月13日一次沙尘天气过程的影响。结果表明:沙尘暴爆发时,河西走廊为风速大值区,风速8~10 m·s-1;区域气候模式模拟的沙尘特征量与站点...
EXPLORING THE MEAN ANNUAL PRECIPITATION AND TEMPERATURE VALUES OVER TURKEY BY USING ENVIRONMENTAL VARIABLES
Precipitation Temperature Spatial Analysis Exploration
2015/9/28
Global warming and climate change that threat seriously population living as well as agriculture, environment, economy, and industry are
very important topics for all over the world. Therefore effic...
The role of the high resolution weather forecast in estimating the run-offusing a simple hydrological model
high resolution forecast heavy precipitation
2015/9/16
Recent and repeated episodes of severe weather in Italy have stressed the need to have a suffi ciently accurate forecast
to give adequate warning to the involved areas. The impact of the precipitatio...
The impact of periodization methods on the kinetic energy spectra for limited-area numerical weather prediction models
kinetic energy spectra impact of periodization methods
2015/3/5
The paper deals with the comparison of the most
common periodization methods used to obtain spectral fields
of limited-area models for numerical weather prediction.
Weather derivatives and hedging the weather risks
eather-related risks hedging weather derivatives
2014/7/24
The article focuses on weather derivatives with the aim to present the substance of weather derivatives as relatively new financial products and to discuss their advantages and disadvantages when bein...