检索结果-南通市图书馆

Features of the Extremely Severe Drought in the East of Southwest China and Anomalies of Atmospheric Circulation in Summer 2006

引用

Acta meteorologica Sinica 2011年第2期25卷 176-187页

作者：李永华徐海明刘德 Key Laboratory of meteorological disaster of Ministry of Education Nanjing University of Information Science & Technology Chongqing Institute of meteorological Sciences Chongqing Municipal meteorological Bureau

The spatial-temporal features of the extremely severe drought and the anomalous atmospheric circulation in summer 2006 are analyzed based on the NCEP/NCAR reanalysis data,the characteristic circulation indices given by the National Climate center of China,and the daily precipitation data of 20 stations in the east of Southwest China（ESC） from 1959 to *** results show that the rainless period started from early June and ended in early September 2006 with a total of more than 80 days,and the rainfall was especially scarce from around 25 July to 5 September *** for each month was less than normal,and analysis of the precipitation indices shows that the summer precipitation in 2006 was the least since *** extremely severe drought in the ESC in summer 2006 was closely related to the persistent anomalies of the atmospheric circulation in the same period,i.e.,anomalies of mid-high latitude atmospheric circulation,western Pacific subtropical high（WPSH）,westerlies,South Asian high,lower-level flow,water vapor transport,vertical motion,and so *** usually occur when the WPSH lies anomalously northward and westward,or anomalously weak and *** extreme drought in summer 2006 was caused by the *** the WPSH turned stronger and shifted to the north and west of its normal position,and the South Asian high was also strong and lay eastward,downdrafts prevailed over the ESC and suppressed the water vapor transfer toward this *** the same time,the disposition of the westerlies and the mid-high latitude circulation disfavored the southward invasion of cold air,which jointly resulted in the extremely severe drought in the ESC in summer *** weak heating over the Tibetan Plateau and vigorous convective activities over the Philippine area were likely responsible for the strong WPSH and its northwestward shift in summer 2006.

关键词： the east of Southwest China extremely severe drought anomalous atmospheric circulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A STUDY ON THE EFFECT OF SPRING INDIAN OCEAN SSTA ON SUMMER EXTREME PRECIPITATION EVENTS OVER THE EASTERN NW CHINA

引用

Journal of Tropical Meteorology 2011年第1期17卷 27-35页

作者：江志红杨金虎张强 Key Laboratory of Chinese Ministry of Education for meteorological disaster Nanjing University of Information Science & Technology Chendu Institute of Plateau Meteorology of China meteorological Administration National Climate center

Based on monthly mean wind,geopotential height,specific humidity,and surface pressure of NCAR/NCEP reanalysis,NOAA-reconstructed sea surface temperature (SST) of the Indian Ocean,and daily precipitation data at 97 meteorological stations over the eastern NW China in the past 47 years,the threshold values for extreme precipitation events (EPE) are defined using the percentile *** Value Decomposition and synthetic analysis methods are used to analyze the relationship between summer EPE in the eastern NW China and SSTA in the preceding fall,winter,spring,and the concurrent *** result shows that preceding spring SST anomalies (SSTA) in the Indian Ocean are clear indicators for the forecast of summer EPE in the eastern NW China,and a key area of impact is located in the equatorial Indian *** spring SST is anomalously high in the equatorial Indian Ocean,the meridional circulation averaged over 100°E-110°E will be anomalously ascending near the equator but anomalously descending near 30°N in the middle and upper troposphere from the concurrent to the subsequent *** the meantime,the Southwest Monsoon from the Indian Ocean will be anomalously weak and there will be no anomalous water vapor transport to the eastern NW China,resulting in a lack of EPE in the subsequent summer,and vice *** addition,in response to anomalously high SST in the equatorial Indian Ocean in spring,the South Asia high pressure tends to be strong in the subsequent summer and more to the *** the anomalously low SST year,however,the South Asia high tends to be weak in the subsequent summer and more to the *** is another possible cause of the variation of summer EPE in the eastern NW China.

关键词： extreme precipitation events SVD SSTA eastern NW China Indian Ocean

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluating the Algorithm for Correction of the Bright Band Effects in QPEs with S-, C-and X-Band Dual-Polarized Radars

引用

Advances in Atmospheric Sciences 2019年第1期36卷 41-54页

作者： Yang CAO Debin SU Xingang FAN Hongbin CHEN Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of Sciences College of Electronic Engineering Chengdu University of Information Technology sichuan meteorological disasters prevention technology center China meteorological Administration Key Laboratory of Atmospheric Sounding Department of Geography and Geology Western Kentucky University

The bright band, a layer of enhanced radar reflectivity associated with melting ice particles, is a major source of signifi- cant overestimation in quantitative precipitation estimation （QPE） based on the Z-R （reflectivity factor-rain rate） relationship. The effects of the bright band on radar-based QPE can be eliminated by vertical profile of reflectivity （VPR） correction. In this study, we applied bright-band correction algorithms to evaluate three different bands （S-, C- and X-band） of dual-polarized radars and to reduce overestimation errors in Z-R relationship-based QPEs. After the reflectivity was corrected by the algo- rithms using average VPR （AVPR） alone and a combination of average VPR and the vertical profile of the copolar correlation coefficient （AVPR＋CC）, the QPEs were derived. The bright-band correction and resulting QPEs were evaluated in eight precipitation events by comparing to the uncorrected reflectivity and rain-gange observations, separately. The overestimation of Z-R relationship-based QPEs associated with the bright band was reduced after correction by the two schemes for which hourly rainfall was less than 5 mm. For the verification metrics of RMSE （root-mean-square error）, RMAE （relative mean absolute error） and RMB （relative mean bias） of QPEs, averaged over all eight cases, the AVPR method improved from 2.28, 0.94 and 0.78 to 1.55, 0.60 and 0.40, respectively, while the AVPR＋CC method improved to 1.44, 0.55 and 0.30, respectively. The QPEs after AVPR＋CC correction had less overestimation than those after AVPR correction, and similar conclusions were drawn for all three different bands of dual-polarized radars.

关键词： dual-polarized radar bright band QPE vertical profile of reflectivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Possible Combined Influences of Absorbing Aerosols and Anomalous Atmospheric Circulation on Summertime Diurnal Temperature Range Variation over the Middle and Lower Reaches of the Yangtze River

引用

Journal of meteorological Research 2016年第6期30卷 927-943页

作者： CAI Jiaxi GUAN Zhaoyong MA Fenhua Key Laboratory of meteorological disaster Ministry of Education Joint International Research Laboratory of Climate and Environment Change Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology

Based on the temperature data from the China meteorological Administration, NCEP-NCAR reanalysis data, and the TOMS Aerosol Index （AI）, we analyze the variations in the summertime diurnal temperature range （DTR） and temperature maxima in the middle and lower reaches of the Yangtze River （MLRYR） in China. The possible relationships between the direct warming effect of the absorbing aerosol and temperature variations are further investigated, although with some uncertainties. It is found that the summertime DTR exhibits a decreasing trend over the most recent 50 years, along with a slight increasing tendency since the 1980s. The trend of the maximum temperature is in agreement with those of the DTR and the absorbing aerosols. To investigate the causes of the large anomalies in the temperature maxima, composite analyses of the circulation anomalies are performed. When anomalous AI and anomalous maximum temperature over the MLRYR have the same sign, an anomalous circulation with a quasi-barotropic structure occurs there. This anomalous circulation is modulated by the Rossby wave energy propagations from the regions northwest of the MLRYR and influences the northwestern Pacific subtropical high over the MLRYR. In combination with aerosols, the anomalous circulation may increase the maximum temperature in this region. Conversely, when the anomalous AI and anomalous maximum temperature in the MLRYR have opposite signs, the anomalous circulation is not equivalently barotropic, which possibly offsets the warming effect of aerosols on the maximum temperature changes in this region. These results are helpful for a better understanding of the DTR changes and the occurrences of temperature extremes in the MLRYR region during boreal summer.

关键词： diurnal temperature range absorbing aerosol circulation anomaly middle and lower reaches of the Yangtze River boreal summer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

LOW-FREQUENCY CIRCULATION AND EXTENDED-RANGE FORECAST IN CONNECTION WITH AUTUMN EXTREME HEAVY RAINFALL PROCESS IN HAINAN

引用

Journal of Tropical Meteorology 2019年第4期25卷 542-552页

作者： WEI Xiao-wen LIANG Ping WU Hui Hainan meteorological Services center Haikou 570203 China Key Laboratory of Southern China Sea meteorological disaster prevention and Mitigation of Hainan Province Haikou 570203 China Shanghai Climate center Shanghai 200030 China Hainan Climate center Haikou 570203 China

Observed daily precipitation data from the National meteorological Observatory in Hainan province and daily data from the National centers for Environmental Prediction/National center for Atmospheric Research(NCEP/NCAR)reanalysis-2 dataset from 1981 to 2014 are used to analyze the relationship between Hainan extreme heavy rainfall processes in autumn(referred to as EHRPs) and 10-30 d low-frequency circulation. Based on the key low-frequency signals and the NCEP Climate Forecast System Version 2(CFSv2) model forecasting products, a dynamical-statistical method is established for the extended-range forecast of EHRPs. The results suggest that EHRPs have a close relationship with the 10-30 d low-frequency oscillation of 850 hPa zonal wind over Hainan Island and to its north, and that they basically occur during the trough phase of the low-frequency oscillation of zonal wind. The latitudinal propagation of the low-frequency wave train in the middle-high latitudes and the meridional propagation of the low-frequency wave train along the coast of East Asia contribute to the"north high(cold), south low(warm)"pattern near Hainan Island, which results in the zonal wind over Hainan Island and to its north reaching its trough,consequently leading to EHRPs. With the link between low-frequency circulation and EHRPs being considered, a low-frequency wave train index(LWTI) is defined and adopted to forecast EHRPs by using NCEP CFSv2 forecasting products. EHRPs are predicted to occur during peak phases of LWTI with value larger than 1 for three or more consecutive forecast days. Hindcast experiments for EHRPs in 2015-2016 indicate that EHRPs can be predicted 8-24 d in advance, with an average period of validity of 16.7 d.

关键词： heavy rainfall process extended-range forecast method low-frequency oscillation 10-30d CFSv2

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessment of the Capability of ENSEMBLES Hindcasts in Predicting Spring Climate in China

引用

Journal of meteorological Research 2019年第2期33卷 307-322页

作者： Yitong LIN Haiming XU Jing MA Haijun LI Collaborative Innovation center on Forecast and Evaluation of meteorological disasters/Key Laboratory of meteorological disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment ChangeNanjing University of Information Science &Technology

Using the hindcasts provided by the Ensemble-Based Predictions of Climate Changes and Their Impacts(ENSEMBLES) project for the period of 1980–2005, the forecast capability of spring climate in China is assessed mainly from the aspects of precipitation, 2-m air temperature, and atmospheric circulations. The ENSEMBELS can reproduce the climatology and dominant empirical orthogonal function(EOF) modes of precipitation and 2-m air temperature, with some differences arising from different initialization months. The multi-model ensemble(MME) forecast of interannual variability is of good performance in some regions such as eastern China with February *** spatial patterns of the MME interannual and inter-member spreads for precipitation and 2-m air temperature are consistent with those of the observed interannual spread, indicating that internal dynamic processes have major impacts on the interannual anomaly of spring climate in China. We have identified two coupled modes between intermember anomalies of the 850-hPa vorticity in spring and sea surface temperature(SST) both in spring and at a lead of 2 months, of which the first mode shows a significant impact on the spring climate in China, with an anomalous anticyclone located over Northwest Pacific and positive precipitation and southwesterly anomalies in eastern *** results also suggest that the SST at a lead of two months may be a predictor for the spring climate in eastern China. A better representation of the ocean–atmosphere interaction over the tropical Pacific, Northwest Pacific, and Indian Ocean can improve the forecast skill of the spring climate in eastern China.

关键词： ENSEMBLES seasonal forecast spring climate coupled atmosphere-ocean mode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impacts of the Boreal Summer Intraseasonal Oscillation on the Warm-Season Rainfall over Hainan Island

引用

Journal of Tropical Meteorology 2022年第4期28卷 457-472页

作者： MA Wen-lan ZHU Lei FENG Xiao ZHANG Ke-ying Key Laboratory of meteorological disaster(KLME) Ministry of Education and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjing 210044 China Key Laboratory of South China Sea meteorological disaster prevention and Mitigation of Hainan Province Haikou 570203 China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdaoShandong 266100 China

This study investigates the roles of the boreal summer intraseasonal oscillation(BSISO)in the diurnal rainfall cycle over Hainan Island during the warm season(April-September)using 20-year satellite-based precipitation,ERA5 and the outgoing longwave radiation data with the phase composite analysis *** show that the spatial distributions of the hourly rainfall anomaly significantly change under the BSISO phases 1-8 while no clear variations are found on the daily and anomaly daily area-averaged rainfall over the *** the BSISO phase 1,the rainfall anomaly distinctly increases in the morning over the southwest and late afternoon over the northeast of the island,while suppressed convection occurs in the early afternoon over the southwest *** this circumstance,strong low-level westerly winds bring abundant moisture into the island,which helps initiate the nocturnal-morning convection over the south coastal area,and drives the convergence region of sea breeze fronts to concentrate into the *** to Phase 1,an almost completely reversed diurnal cycle of rainfall anomaly is found in Phase 5,whereas a positive anomalous rainfall peak is observed in the early afternoon over the center while negative peaks are found in the morning and late afternoon over the southwest and northeast,owing to a strong low-level northeasterly anomaly flow,which causes relatively low moisture and enlarges a sea-breeze convergence area over the *** Phase 8,strongest moisture is found over the island all through the day,which tends to produce highest rainfall in the afternoon with enhanced anomalous *** results further indicate that multiscale interactions between the large-scale circulations and local land-sea breeze circulations play important roles in modulating diurnal precipitation cycles over the tropical island.

关键词： BSISO diurnal rainfall cycle Hainan Island sea breeze large-scale circulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unprecedented Hot Extremes Observed in City Clusters in China during Summer 2022

引用

Journal of meteorological Research 2023年第2期37卷 141-148页

作者： Yufeng YUAN Zhen LIAO Baiquan ZHOU Panmao ZHAI Key Laboratory of meteorological disaster of Ministry of Education Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science&TechnologyNanjing210044 State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing100081

We report here extreme daytime and nighttime temperatures,severe heatwaves,and compound hot events recorded in China's five most densely populated city clusters in summer *** records were set,with daytime maximum temperatures>42℃in cities along the Yangtze River valley and extreme nighttime temperatures>30℃.Widespread prolonged heatwaves lasting for>40 days and compound hot days occurring for>32 consecutive days were experienced in these city *** explore the possible causes of these extreme events,we analyzed the linkages between the changes in the mean temperatures and hot extremes for different-sized cities in the city *** found that megacities(e.g.,Beijing,Shanghai,Guangzhou,etc.)and large cities(e.g.,Baoding,Wuxi,Foshan,etc.),especially those located in central and eastern China,experienced unprecedented extreme high temperatures,not only in the daytime but also at *** observed large increases in the mean temperatures and more frequent and more intense hot extremes in cities affected by both the background global warming and intensified *** and large cities experienced higher and more frequent extreme temperatures and greater warming trends than medium-and small-sized cities(e.g.,Zhangjiakou,Zhenjiang,Yaan,etc.).The evidence of the dependence of temperature trends on a city's size shows that intensified heat island effects may increase the threat of hot extremes in cities undergoing rapid urbanization.

关键词： China city clusters hot extremes summer 2022

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of Urban Land-Use Change in Eastern China on the East Asian Subtropical Monsoon:A Numerical Study

引用

Journal of meteorological Research 2016年第2期30卷 203-216页

作者：余荣江志红翟盘茂 Collaborative Innovation center on Forecast and Evaluation of meteorological disasters and Key Laboratory of meteorological disaster of Ministry of Education Nanjing University of Information Science & Technology College of Atmospheric Science Nanjing University of Information Science & Technology State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences

The effect of urban land-use change in eastern China on the East Asian subtropical monsoon（EASTM） is investigated by using the Community Atmosphere Model version *** of the results between the urban expansion and reference experiments shows that with the urban expansion,the land surface energy balance alters：surface net radiation and sensible heat fluxes enhance while the latent heat fluxes *** a result,a significant increase in surface air temperature over eastern China is *** urban land-use change contributes to a change in the zonal land-sea temperature difference（LSTD）,leading to a delay in the time when LSTD changes from positive to negative,and vice ***,the onset and retreat dates of the EASTM are also ***,the rise in surface air temperature leads to formation of abnormal northerly air flows,which may be the reason for the slower northward movement of the EASTM and a more southward location of its northern boundary.

关键词： urban land-use change the East Asian subtropical monsoon northern boundary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Disastrous Persistent Extreme Rainfall Events of the 2022 Pre-Flood Season in South China:Causes and Subseasonal Predictions

引用

Journal of meteorological Research 2023年第4期37卷 469-485页

作者： Jiehong XIE Pang-Chi HSU Yamin HU Qiaomei LIN Mengxi YE Key Laboratory of meteorological disaster of Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation center on Forecast and Evaluation of meteorological disasters Nanjing University of Information Science&TechnologyNanjing 210000 Jieyang meteorological Bureau China Meteorological AdministrationJieyang 522000 Guangdong Climate center China Meteorological AdministrationGuangzhou 510000

Two persistent extreme rainfall events(PEREs) with record-breaking amounts of rainfall and long duration caused disastrous impact during the 2022 pre-flood season in South China. Atmospheric intraseasonal variability played a key role in triggering and maintaining both PEREs, but its major impact on each event was associated with different modes. For the first PERE(10-15 May;PERE1), the tropical and extratropical quasi-biweekly oscillations jointly contributed to the extreme rainfall intensity. In contrast, the long duration(6-21 June) of the heavy rainfall during the second PERE(PERE2) was closely related to prolonged convection and moisture transport anomalies induced mainly by the tropical 30-90-day variability. Subseasonal-to-seasonal predictions by the model of the ECMWF showed limited skill in relation to the rainfall intensity of PERE1 and PERE2 beyond 1–2 weeks. Further assessment suggested that the fidelity of the PERE predictions was linked to model skill in predicting the phase evolution and intensity of tropical and extratropical intraseasonal variabilities. Thus, efficient monitoring and accurate prediction of the various modes of atmospheric intraseasonal variability are fundamental to reducing the hazard associated with PEREs in South China.

关键词： persistent extreme rainfall event intraseasonal oscillation South China subseasonal-to-seasonal prediction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：