2017年春季海洋天气评述          下载免费PDF全文

王慧  杨正龙  许映龙  钱传海  曹越男  吕爱民 《山东气象》2017,37(3):73-84

2017年春季（3—5月）大气环流特征为：北半球极涡呈单极型分布,主体位于北冰洋上空,中高纬西风带呈5波型分布。3月,地面冷高压偏强,冷空气活动频繁。4月,环流由纬向型向经向型逐渐调整,冷空气势力减弱。5月,东北气旋明显加强,冷暖势力相当,入海气旋增多。春季,我国近海海域主要有16次8级以上大风过程,其中冷空气大风过程有7次,冷空气和温带气旋共同影响的大风过程有1次,入海温带气旋过程有4次,东北冷涡影响大风过程有3次,强对流导致雷暴大风过程1次;且有8次明显的浪高在2 m以上的大浪过程。春季共有6次比较明显的海雾过程,分别为3月1次、4月2次、5月3次。西北太平洋和南海共生成1个台风“梅花”和1个热带低压,其他各大洋共有热带气旋15个,分别为大西洋1个、东太平洋1个、南太平洋5个、南印度洋6个、北印度洋2个。  相似文献   

新疆夏季变湿的大气环流异常特征   总被引：14，自引：3，他引：11  

赵兵科  蔡承侠  杨莲梅  王慧 《冰川冻土》2006,28(3):434-442

利用1961-2003年NCEP/NCAR再分析资料和中国气象局整编的新疆夏季(6~8月)月降水量资料,分析了新疆夏季1971-1986年干旱期和1987-2003年湿润期的大气环流变化异常特征.结果表明:在平均环流场上,中亚-巴尔喀什湖槽及上下游地区脊的增强是新疆地区夏季变湿的环流场特征之一,且中亚-巴尔喀什湖槽随高度增加强度明显增强,200 hPa达到最强;源于低纬阿拉伯海向北直至中亚对流层低层偏南的强气流是湿润期环流异常、降水增多的又一特征,也是水汽重要来源之一;中亚上空高空急流轴南压是新疆夏季湿润期与干旱期高空急流最重要的差异特征.  相似文献   

Effect of the Initial Vortex Structure on Intensity Change During Eyewall Replacement Cycle of Tropical Cyclones: A Numerical Study     

杨昕玮  王玉清  王慧  徐晶  占瑞芬 《热带气象学报(英文版)》2024,30(2):106-117

This study investigates the effect of the initial tropical cyclone (TC) vortex structure on the intensity change during the eyewall replacement cycle (ERC) of TCs based on two idealized simulations using the Weather Research and Forecasting (WRF) model. Results show that an initially smaller TC with weaker outer winds experienced a much more drastic intensity change during the ERC than an initially larger TC with stronger outer winds. It is found that an initially larger TC vortex with stronger outer winds favored the development of more active spiral rainbands outside the outer eyewall, which slowed down the contraction and intensification of the outer eyewall and thus prolonged the duration of the concentric eyewall and slow intensity evolution. In contrast, the initially smaller TC with weaker outer winds corresponded to higher inertial stability in the inner core and weaker inertial stability but stronger filamentation outside the outer eyewall. These led to stronger boundary layer inflow, stronger updraft and convection in the outer eyewall, and suppressed convective activity outside the outer eyewall. These resulted in the rapid weakening during the formation of the outer eyewall, followed by a rapid re-intensification of the TC during the ERC. Our study demonstrates that accurate in- itialization of the TC structure in numerical models is crucial for predicting changes in TC intensity during the ERC. Additionally, monitoring the activity of spiral rainbands outside the outer eyewall can help to improve short-term intensity forecasts for TCs experiencing ERCs.  相似文献   

气候变化背景下红火蚁在中国的潜在分布区变化（英文）     

王焕炯  王慧  陶泽兴  葛全胜 《地理学报(英文版)》2018,(12)

The red imported fire ant(RIFA, Solenopsis invicta), a notorious invasive insect, has received considerable attention owing to its impacts on native biodiversity, agriculture, and human health. Under global warming, the inhabitable area of the RIFA may be enlarged. However, few studies have focused on the potential range expansion of the RIFA in East Asia. Using a process-based physiological model, we simulated the potential range of the RIFA in China based on gridded temperature datasets for the current(2004–2012) and future(2090–2100) climates under Representative Concentration Pathway(RCP) 4.5 and RCP 8.5. It was found that the southeastern part of China(below 32°N) is suitable for RIFA proliferation. The present distribution area of the RIFA corresponds well with the potential range simulated by the model. In the RCP 4.5 and RCP 8.5 warming scenarios, the inhabitable area of the RIFA along the northern boundary would on average extend 101.3±85.7(mean±SD) and 701.2±156.9 km, respectively, by the end of the 21 st century. Therefore, future climate change would significantly affect the inhabitable area of the RIFA. Our results provide the basis for local quarantine officials to curtail accidental introductions of this insect, especially in the certain and possible infestation zones.  相似文献   

基于街景工厂构建城市三维模型的方法探讨     

王慧 《测绘与空间地理信息》2017,(4)

利用倾斜摄影测量数据对街景工厂中空三加密、控制点布设、三维建模构建和成果精度分析等进行研究,可为类似工作提供经验和方法。  相似文献   

3月高温少雨开春早4月低温多雨风灾重     

王慧  王铁 《沙漠与绿洲气象(新疆气象)》2001,24(3):38-39

2001年 3月全疆出现了异常高温少雨，大部地区开春期、终霜期明显提早；进入 4月份，我区天气过程频繁发生，且强度强，造成 4月全疆气温偏低降水多，同时受其影响全疆大部地区遭受了多次较严重的大风、风沙和低温霜冻危害，部分地区出现了近 30年来最强的大风、沙尘暴，给农牧业生产，尤其是棉花生产造成了重大损失。 1平均环流形势特征 3月北半球 500hPa高度场上，中高纬环流呈 3波型分布，东亚大槽和欧洲大槽较常年加深。反映在距平场上，东亚至西北太平洋、北大西洋至欧洲北部、阿拉斯加地区为负高度距平控制，其中日本海附近上空距平…  相似文献   

山东省20世纪90年代产业结构变动研究     

刘兆德  王慧 《地理与地理信息科学》2001,17(1):25-30

分析山东 90年代产业结构变动趋向的时空差异 ,探讨产业结构变动的原因及地区产业结构变动能力 ,并对山东产业结构走向及产业结构在地区间的协调发展提出建议。  相似文献   

广东三水盆地古俯冲带地幔源岩石的年代学与Nd-Sr-Pb同位素证据     

朱炳泉  王慧芬  毛存孝  朱乃娟  黄荣生  彭建华  蒲志平 《地球化学》1991,(1)

广东三水盆地火山岩岩石化学资料表明为具岛弧特征的拉斑-钙碱性岩系。K-Ar年龄为43-64Ma,属早第三纪。Nd-S-Pb同位素相关构成两个二元混合趋向,表明其源区为雷琼亏损地幔源与海水和蚀变俯冲沉积物相混合。这一结果表明华南大陆内存在着古俯冲带。它是由中国南部不同地体在缝合过程中产生的。  相似文献   

ONSET AND RETREAT DATES OF THE SOUTH CHINA SEA SUMMER MONSOON AND THEIR RELATIONSHIPS WITH THE MONSOON INTENSITY IN THE CONTEXT OF CLIMATE WARMING     

李栋梁  蒋元春  张莉萍  王慧  李潇 《热带气象学报(英文版)》2016,22(3):362-373

Global gridded daily mean data from the NCEP/NCAR Reanalysis(1948-2012) are used to obtain the onset date,retreat date and duration time series of the South China Sea summer monsoon(SCSSM) for the past 65 years.The summer monsoon onset(retreat) date is defined as the time when the mean zonal wind at 850 hPa shifts steadily from easterly(westerly) to westerly(easterly) and the pseudo-equivalent potential temperature at the same level remains steady at greater than 335 K(less than 335 K) in the South China Sea area[110-120°E(10-20°N)].The clockwise vortex of the equatorial Indian Ocean region,together with the cross-equatorial flow and the subtropical high,plays a decisive role in the burst of the SCSSM.The onset date of the SCSSM is closely related to its intensity.With late(early) onset of the summer monsoon,its intensity is relatively strong(weak),and the zonal wind undergoes an early(late) abrupt change in the upper troposphere.Climate warming significantly affects the onset and retreat dates of the SCSSM and its intensity.With climate warming,the number of early-onset(-retreat) years of the SCSSM is clearly greater(less),and the SCSSM is clearly weakened.  相似文献   

西沙周边海域海平面异常变化特征及成因分析     

王慧  韩树宗  范文静  王国松  刘克修  张增健 《海洋学报(英文版)》2016,35(9):34-41

Based on the analysis of wind,ocean currents,sea surface temperature(SST) and remote sensing satellite altimeter data,the characteristics and possible causes of sea level anomalies in the Xisha sea area are investigated.The main results are shown as follows:(1) Since 1993,the sea level in the Xisha sea area was obviously higher than normal in 1998,2001,2008,2010 and 2013.Especially,the sea level in 1998 and 2010 was abnormally high,and the sea level in 2010 was 13.2 cm higher than the muti-year mean,which was the highest in the history.In 2010,the sea level in the Xisha sea area had risen 43 cm from June to August,with the strength twice the annual variation range.(2) The sea level in the Xisha sea area was not only affected by the tidal force of the celestial bodies,but also closely related to the quasi 2 a periodic oscillation of tropical western Pacific monsoon and ENSO events.(3)There was a significant negative correlation between sea level in the Xisha sea area and ENSO events.The high sea level anomaly all happened during the developing phase of La Ni?a.They also show significant negative correlations with Ni?o 4 and Ni?o 3.4 indices,and the lag correlation coefficients for 2 months and 3 months are–0.46 and –0.45,respectively.(4) During the early La Ni?a event form June to November in 2010,the anomalous wind field was cyclonic.A strong clockwise vortex was formed for the current in 25 m layer in the Xisha sea area,and the velocity of the current is close to the speed of the Kuroshio near the Luzon Strait.In normal years,there is a "cool eddy".While in 2010,from July to August,the SST in the area was 2–3°C higher than that of the same period in the history.  相似文献