检索结果-南通市图书馆

Atmospheric and Oceanic Science Letters 2025年第1期18卷 24-31页

作者： Tiantian Tang Jiaying He Huihang Sun Jingjia Luo Institute for Climate and Application Research(ICAR)/key laboratory of meteorological disaster Nanjing University of Information Science and TechnologyNanjingChina

A remarkable marine heatwave,known as the“Blob”,occurred in the Northeast Pacific Ocean from late 2013 to early 2016,which displayed strong warm anomalies extending from the surface to a depth of 300 *** study employed two assimilation schemes based on the global Climate Forecast System of Nanjing University of Information Science(NUIST-CFS 1.0)to investigate the impact of ocean data assimilation on the seasonal prediction of this extreme marine *** sea surface temperature(SST)nudging scheme assimilates SST only,while the deterministic ensemble Kalman filter(EnKF)scheme assimilates observations from the surface to the deep *** latter notably improves the forecasting skill for subsurface temperature anomalies,especially at the depth of 100-300 m(the lower layer),outperforming the SST nudging *** excels in predicting both horizontal and vertical heat transport in the lower layer,contributing to improved forecasts of the lower-layer warming during the *** improvements stem from the assimilation of subsurface observational data,which are important in predicting the upper-ocean *** results suggest that assimilating ocean data with the EnKF scheme significantly enhances the accuracy in predicting subsurface temperature anomalies during the Blob and offers better understanding of its underlying mechanisms.

关键词： Seasonal forecast Ocean data assimilation Marine heatwave Subsurface temperature

Interannual variability of boreal summer intraseasonal oscillation over the northwestern Pacific influenced by the Pacific Meridional Mode

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 6-11页

作者： Haoyu Zhou Pang-Chi Hsu Lin Chen Yitian Qian key laboratory of meteorological disaster Ministry of Education/Joint International Research Laboratory of Climate and Environmental Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjingChina

During the boreal summer,intraseasonal oscillations exhibit significant interannual variations in intensity over two key regions:the central-western equatorial Pacific(5°S-5°N,150°E-150°W)and the subtropical Northwestern Pacific(10°-20°N,130°E-175°W).The former is well-documented and considered to be influenced by the ENSO,while the latter has received comparatively less attention and is likely influenced by the Pacific Meridional Mode(PMM),as suggested by partial correlation analysis *** elucidate the physical processes responsible for the enhanced(weakened)intraseasonal convection over the subtropical northwestern Pacific during warm(cold)PMM years,the authors employed a moisture budget *** findings reveal that during warm PMM years,there is an increase in summer-mean moisture over the subtropical northwestern *** increase interacts with intensified vertical motion perturbations in the region,leading to greater vertical moisture advection in the lower troposphere and consequently resulting in convective *** a process is pivotal in amplifying intraseasonal convection *** observational findings were further verified by model experiments forced by PMM-like sea surface temperature patterns.

关键词： Boreal summer intraseasonal oscillation Interannual variability Pacific Meridional Mode Moisture budget analysis

Application of the improved dung beetle optimizer,muti-head attention and hybrid deep learning algorithms to groundwater depth prediction in the ningxia area,China

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 18-23页

作者： Jiarui Cai Bo Sun Huijun Wang Yi Zheng Siyu Zhou Huixin Li Yanyan Huang Peishu Zong 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 and TechnologyNanjingChina Southern Marine Science and Engineering Guangdong laboratory(Zhuhai) ZhuhaiChina China meteorological Administration Key Laboratory of Transportation MeteorologyNanjingChina Jiangsu meteorological Observatory NanjingChina

Due to the lack of accurate data and complex parameterization,the prediction of groundwater depth is a chal-lenge for numerical *** learning can effectively solve this issue and has been proven useful in the prediction of groundwater depth in many *** this study,two new models are applied to the prediction of groundwater depth in the ningxia area,*** two models combine the improved dung beetle optimizer(DBO)algorithm with two deep learning models:The Multi-head Attention-Convolution Neural Network-Long Short Term Memory networks(MH-CNN-LSTM)and the Multi-head Attention-Convolution Neural Network-Gated Recurrent Unit(MH-CNN-GRU).The models with DBO show better prediction performance,with larger R(correlation coefficient),RPD(residual prediction deviation),and lower RMSE(root-mean-square error).Com-pared with the models with the original DBO,the R and RPD of models with the improved DBO increase by over 1.5%,and the RMSE decreases by over 1.8%,indicating better prediction *** addition,compared with the multiple linear regression model,a traditional statistical model,deep learning models have better prediction performance.

关键词： Groundwater depth Multi-head attention Improved dung beetle optimizer CNN-LSTM CNN-GRU ningxia

OBSERVATIONAL STUDIES ON SAND-DUST STORM IN HELAN MOUNTAINOUS AREA

在线全文

学校读者我要写书评

暂无评论

Acta meteorologica Sinica 2001年第4期15卷 485-497页

作者：牛生杰章澄昌孙继明樊曙先 Nanjing Institute of Meteorology Beijing Institute of Meteorology ningxia key laboratory of meteorological disaster prevention and mitigation ningxia University

According to the observation of the number and mass concentration spectra of atmospheric aerosols,the total suspended particulates (TSP) and their size distribution,micrometeorology, and the solar spectroscopic radiation,even neutron activation treatment of sand dust samples in Helan Mountainous *** formation law of floating dust,blowing sand and sandstorm weather and the characteristics of climatic variation in this area and the influence of the Helan Mountain are counted and *** addition,the spectrum characteristics,optical depth and chemical composition of sand aerosol particles are also analyzed and discussed.

关键词： sand-dust storm particle size distribution optical depth chemical composition

Raindrop Size Distribution Measurements at High Altitudes in the Northeastern Tibetan Plateau during Summer

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第7期40卷 1244-1256页

作者： Huibang HAN Yuxin ZHANG Jianbing TIAN Xiaoyan KANG meteorological disaster prevention Technology Center in Qinghai Province Xining 810000China key laboratory for disaster prevention and mitigation in Qinghai Province Xining 810000China

Characteristics of raindrop size distribution during summer are studied by using the data from six Parsivel disdrometers located in the northeastern Tibetan *** analysis focuses on convective and stratiform precipitation at high altitudes from 2434 m to 4202 *** results show that the contribution of stratiform and convective precipitation with rain rate between 1≤R<5 mm h^(-1) to the total precipitation increases with altitude,and the raindrop scale and number concentration of convective precipitation is larger than that for stratiform *** droplet size spectra of both stratiform and convective precipitation shows a single peak with a peak particle size between 0.31–0.50 mm,and they have essentially the same peak particle size and number concentration at the same *** maximum spectral widths of stratiform clouds are between 4 mm and 5 mm,while those of convective clouds range from 4 mm to 8 *** Gamma distribution is more suitable than the Marshall-Palmer distribution in terms of the actual raindrop spectrum *** stratiform precipitation particles are smaller with higher number concentration,while the opposite is true for the convective precipitation *** convective precipitation particles drop faster than stratiform precipitation particles when the particle size exceeds 2 mm,and the falling velocity of raindrops after standard curve fitting is underestimated during the observation ***,conventional radar estimation methods would underestimate the precipitation in the Northeastern Tibetan Plateau.

关键词： raindrop size distribution precipitation microphysics Northeastern Tibetan Plateau fall velocity

Trends of the sunshine duration and diffuse radiation percentage on sunny days in urban agglomerations of China during 1960–2005

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第8期27卷 206-211页

作者： Chuanbo Fu Li Dan Youlong Chen Jiaxiang Tang Hainan meteorological Observatory key laboratory of Regional Climate-Environment Research for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences key laboratory of South China Sea meteorological disaster prevention and mitigation of Hainan Province

The long-term observational data of sunshine duration（SD） and diffuse radiation percentage（defined as diffuse solar radiation/total solar radiation, DRP） on sunny days during 1960–2005 were analyzed in 7 urban agglomerations and the whole of China. The results show that the sunny sunshine duration（SSD） has decreased significantly except at a few stations over northwestern China in the past 46 years. An obvious decrease of the SSD is found in eastern China, with the trend coefficients lower than-0.8. Accompanied by the SSD decline, the sunny diffuse radiation percentage（SDRP） in most stations shows obvious increasing trends during the 46 years. The averaged SDRP over China has increased 2.33%per decade, while the averaged SSD shows a decrease of-0.13 hr/day per decade. The correlation coefficient between SDRP and SSD is-0.88. SSD decreased over urban agglomerations（small to large city clusters） in the past 46 years, especially in large cities and medium cities, due to the strong anthropogenic activities and air pollution represented by aerosol option depth（AOD） and tropospheric column NO2（Tro NO2）. On the regional scale, SSD has an opposite trend from SDRP during 1960 to 2005, and the variation trends of regional mean values of SSD and SDRP in southeastern China are more pronounced than those in northwestern China.

关键词： Sunny sunshine duration Diffuse radiation percentage Annual change

Diagnostic Analysis of Wave Action Density During Heavy Rainfall Caused by Landfalling Typhoon

在线全文

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2022年第3期28卷 364-376页

作者： ZHOU Guan-bo JIAO Ya-yin XU Ying-long National meteorological Center Beijing 100081 China key laboratory of South China Sea meteorological disaster prevention and mitigation of Hainan Province Hainan 570203 China Hebei meteorological disaster prevention and Environmental Meteorology Center Hebei 050033 China

Based on prior investigation,this work defined a new thermodynamic shear advection parameter,which combines the vertical component of convective vorticity vector,horizontal divergence,and vertical gradient of generalized potential *** interaction between waves and fundamental states was computed for the heavyrainfall event generated by landfalling typhoon“Morakot”.The analysis data was produced by ADAS[ARPS(Advanced Regional Prediction System)Data Analysis System]combined with the NCEP/NCAR final analysis data(1°×1°,26 vertical pressure levels and 6-hour interval)with the routine observations of surface and *** it may describe the typical vertical structure of dynamical and thermodynamic fields,the result indicates that the parameter is intimately related to precipitation *** parameter’s positive high-value area closely matches the reported 6-hour accumulated surface *** the statistical analysis reveals a certain correspondence between the thermodynamic shear advection parameter and the observed 6-hour accumulated surface rainfall in the summer of *** implies that the parameter can predict and indicate the rainfall area,as well as the initiation and evolution of precipitation systems.

关键词： disturbance thermodynamic shear advection parameter wave action density generalized potential temperature wave-flow interaction

Zoning Evaluation of Hourly Precipitation in High-resolution Regional Numerical Models over Hainan Island

在线全文

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2023年第4期29卷 460-472页

作者：冯箫吴俞杨薇李勋 Hainan Provincial meteorological Observatory Haikou 570203 China key laboratory of South China Sea meteorological disaster prevention and mitigation of Hainan Province Haikou 570203 China

This study assesses the performance of three high-resolution regional numerical models in predicting hourly rainfall over Hainan Island from April to October for the years from 2020 to *** rainfall amount,frequency,intensity,duration,and diurnal cycle are examined through zoning *** results show that the China Meteor-ological Administration Guangdong Rapid Update Assimilation Numerical Forecast System(CMA-GD)tends to forecast a higher occurrence of light *** underestimates the late afternoon precipitation and the occurrence of short-duration *** China meteorological Administration Shanghai Numerical Forecast Model System(CMA-SH9)reproduces excessive precipitation at a higher frequency and intensity throughout the *** overestimates rainfall during the late afternoon and midnight *** simulated most frequent peak times of rainfall in CMA-SH9 are 0-1 hour deviations from the observed *** China meteorological Administration Mesoscale Weather Numerical Forecasting System(CMA-MESO)displays a similar pattern to rainfall observations but fails to replicate reasonable structure and diurnal variation of *** underestimates the occurrence of long-duration events and overestimates related rainfall amounts from midnight to early ***,significant discrepancies are observed in the predictions of the three models for areas with complex terrain,such as the central,southeastern,and southwestern regions of Hainan Island.

关键词： Hainan Island hourly precipitation regional numerical model zoning evaluation

Circulations and Thermodynamic Characteristics of Different Patterns of Rainstorm Processes in the Eastern Foot of Helan Mountain

在线全文

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2022年第3期28卷 343-363页

作者： CHEN Yu-ying LI Jian-ping ZHANG Su-zhao SU Yang YANG Yin ZHANG Yi-xing YAO Shan-shan key laboratory for meteorological disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions CMAYinchuan 750002 China ningxia key laboratory of meteorological disaster prevention and mitigation Yinchuan 750002 China ningxia meteorological Observatory Yinchuan 750002 China key laboratory of Physical Oceanography Institute for Advanced Ocean StudiesQingdao National Laboratory for Marine Science and TechnologyOcean University of ChinaQingdaoShandong 266100 China

Based on the observational hourly precipitation data and the European Centre for Medium-Range Weather Forecasts(ECMWF)Reanalysis 5(ERA5)products from 2006 to 2020,22 rainstorm processes in the eastern foot of Helan Mountain are objectively classified by using the hierarchical clustering method,and the circulation characteristics of different patterns are comparatively analyzed in this *** results show that the occurrences of rainstorm processes in the eastern foot of Helan Mountain are most closely related to three circulation ***ⅠandⅢmainly occur in July and August,with similar zonal circulations in synoptic ***,the South Asia high and the western Pacific subtropical high are stronger and more northward than those in normal *** frontal systems in westerlies are inactive,while the water vapor from the ocean surface in the south is mainly transported to the rainstorm area by the southerly jet stream at 700 h *** dynamic lifting anomalies are relatively weak,the instability of atmospheric stratification is anomalously strong,and thus the localized severe convective rainstorm is more ***,rainstorm processes of patternⅠare accompanied by stronger and deeper ascending motions,and the warm-sector rainstorm is more ***Ⅲshows a stronger and deeper convective instability,accompanied by larger low-level *** processes of patternⅡmainly occur in early summer and early autumn,presenting a meridional circulation pattern of high in the east and low in the west in terms of geopotential ***,the two low-level jets transporting the water vapor northward from the ocean on the east of China encounter with the frontal systems in westerlies,which makes the ascending motion in patternⅡanomalously strong and *** relatively weak instability of atmospheric stratification causes weak convection and long-lasting precipitation formed by the confluence of cold air and warm ***

关键词： eastern foot of Helan Mountain rainstorm hierarchical clustering objective classification circulation characteristics

Classification of Hailstone Trajectories in a Hail Cloud over a Semi-Arid Region in China

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第10期40卷 1877-1894页

作者： Xiaoli LIU Kerui MIN Jianren SANG Simin MA key laboratory for Aerosol-Cloud-Precipitation of China meteorological Administration Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjing 210044China key laboratory for meteorological disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions CMANingxia Hui Autonomous Region Meteorological BureauYinchuan 750002China ningxia key Lab of meteorological disaster prevention and Reduction Ningxia Hui Autonomous Region Meteorological BureauYinchuan 750002China

The growth trajectory of hailstones in clouds determines the ground intensity and spatial distribution of hailfall.A systematic study of hail trajectories can help improve the current scientific understanding of the mechanisms by which hail forms in semi-arid regions of China and,in doing so,improve the quality of hail forecasts and warnings and help to prevent and mitigate *** this study,the WRFv3.7.1 model was employed to provide the background field to drive the hailstone trajectory *** analysis was then used to classify hail trajectories to investigate the characteristics of different types of hail trajectories and the microphysical characteristics of hail *** differences in hail trajectories might be mainly due to differences in the background flow fields and microphysical fields of hail clouds in different *** analysis revealed that as the maximum particle size of ground hailfall increased,the maximum supercooled cloud water content and the maximum updraft velocity for the formation and growth of hailstone *** larger the size when the hailstone reaches its maximum height,the larger the ground hailstone ***,the formation and growth of hailstone are caused by the joint action of the dynamical flow field and cloud microphysical *** physical processes of hailstone growth and main growth regions differ for different types of hail ***,different catalytic schemes should be adopted in artificial hail prevention operations for different hail clouds and trajectories due to differences in hail formation processes and ground hailfall characteristics.

关键词： hail trajectory trajectory classification hail particle size numerical simulation