检索结果-南通市图书馆

Airborne Investigation of Riming:Cloud and Precipitation Microphysics within a Weak Convective System in North China

引用

Advances in atmospheric sciences 2025年第3期42卷 515-526页

作者： Xiangfeng HU Hao HUANG Shaoyu HOU Kun ZHAO Chuanfeng ZHAO Yinghui LU Jiefang YANG Rong ZHANG Delong ZHAO Weiguo LIU Dan ZHANG Haixia XIAO key laboratory of Radar Meteorology and State key laboratory of severe weather China Meteorology AdministrationBeijing 100044China China Meteorological Administration Xiong'an atmospheric Boundary Layer key laboratory Xiong'an New AreaHebei 071703China Hebei Provincial weather Modification Center ShijiazhuangHebei 051430China school of atmospheric sciences Key Laboratory of Mesoscale Severe Weather/MOEand Frontiers Science Center for Critical Earth Material CyclingNanjing UniversityJiangsu 210023China Department of atmospheric and Oceanic sciences School of PhysicsPeking UniversityBeijing 100871China laboratory of Cloud-Precipitation Physics and severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Cloud-Precipitation Physics and weather Modification key laboratory China Meteorology AdministrationBeijing 100044China Beijing weather Modification Center Beijing 100089China nanjing Joint Institute for atmospheric sciences NanjingJiangsu 210000China

The process of riming significantly impacts the microphysical characteristics of *** study uses aircraft and radar observation data in stratiform clouds with convection embedded that occurred in the central and southern regions of North China on 22 May *** microphysical structural characteristics and processes near the embedded convection core and in the stratiform cloud are analyzed *** attention is given to the effect of riming on the microphysical properties near the upper boundary of the melting layer and to the factors influencing riming *** collaborative observations reveal that the particle size distributions observed near the convection core and in the stratiform region are close,while the particle properties like habit and riming degree are quite *** the melting layer,larger plate-like ice particles and supercooled water droplets(D>50μm)are more abundant near the convective core,leading to higher collision efficiencies between ice particles and supercooled water *** fluctuation amplitudes of vertical airflow near the convective core also contribute to the increased riming activity and the formation of more heavily rimed particles,such as ***,in situ measurements from airborne probes also revealed that above the melting layer,the riming process involves two stages:the mass of snow crystals grows as supercooled droplets merge internally without changing size,followed by external freezing that significantly enlarges the crystals.

关键词： riming collision efficiency airflow fluctuation particle habit aircraft measurement

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Impact of Skin Temperature Control Variable on the Assimilation of Microwave Temperature-sounding Channels in Regional Numerical weather Prediction

引用

Advances in atmospheric sciences 2025年第3期42卷 564-578页

作者： Yaodeng CHEN Qihang YANG Luyao QIN Yuanbing WANG Deming MENG Xusheng YAN key laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China key laboratory of mesoscale severe weather Ministry of EducationSchool of Atmospheric SciencesNanjing UniversityNanjing 210023China

Accurate skin temperature is one of the critical factors in successfully assimilating satellite radiance data over ***,model-simulated skin temperature may not be accurate *** address this issue,an extended skin temperature control variable(TSCV) approach is proposed in a variational assimilation framework,which also considers the background error correlation between skin temperature and atmospheric variables.A series of single observation tests and a 10-day cycling assimilation experiment were conducted to evaluate the impact of the TSCV approach on the assimilation of AMSU-A and ATMS(Advanced Technology Microwave Sounder) microwave temperature-sounding channels over *** results of the single observation tests show that by applying the TSCV approach,not only the direct analysis of skin temperature is realized,but also the interaction between skin temperature and atmospheric variables can be achieved during the assimilation *** results of the cycling experiment demonstrate that the TSCV approach improves the skin temperature analysis,which in turn reduces the RMSE of the surface variables and low-level air temperature *** TSCV approach also reduces the difference between the observed and simulated brightness temperatures of both microwave and infrared window channels over land,suggesting that the approach can facilitate the radiance simulation of these channels,thus contributing to the assimilation of window channels.

关键词： radiance assimilation skin temperature control variable microwave temperature-sounding numerical weather prediction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An Objective Synoptic Analysis Technique for the Identification of Tropical Cyclone Remote Precipitation in China and Its Application

引用

Journal of Ocean university of China 2025年第1期24卷 13-30页

作者： JIA Li DING Chenchen CONG Chunhua REN Fumin LIU Yanan school of atmospheric Science Nanjing University of Information Science and TechnologyNanjing 210044China State key laboratory of severe weather Chinese Academy of Meteorological SciencesBeijing 100081China Public Meteorological Service Center of CMA Beijing 100081China Shandong Meteorological Bureau Jinan 250031China laboratory of Cloud-Precipitation Physics and severe Storms(LACS) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

At present,the identification of tropical cyclone remote precipitation(TRP)requires subjective participation,leading to inconsistent results among different researchers despite adopting the same identification ***,establishing an objective identification method is greatly *** this study,an objective synoptic analysis technique for TRP(OSAT_TRP)is proposed to identify TRP using daily precipitation datasets,historical tropical cyclone(TC)track data,and the ERA5 reanalysis *** method includes three steps:first,independent rain belts are separated,and those that might relate to TCs'remote effects are distinguished according to their distance from the ***,the strong water vapor transport belt from the TC is identified using integrated horizontal water vapor transport(IVT).Third,TRP is distinguished by connecting the first two *** TRP obtained through this method can satisfy three criteria,as follows:1)the precipitation occurs outside the circulation of TCs,2)the precipitation is affected by TCs,and 3)a gap exists between the TRP and TC rain *** diagnosis analysis,compared with subjective TRP results and backward trajectory analyses using HYSPLIT,indicates that OSAT_TRP can distinguish TRP even when multiple TCs in the Northwest Pacific are ***,we applied the OSAT_TRP to select typical TRPs and obtained the synoptic-scale environments of the TRP through composite analysis.

关键词： tropical cyclone remote precipitation objective identification method

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

Airborne Investigation of Riming: Cloud and Precipitation Microphysics within a Weak Convective System in North China

引用

Advances in atmospheric sciences 2025年第3期 515-526页

作者： Xiangfeng HU Hao HUANG Shaoyu HOU Kun ZHAO Chuanfeng ZHAO Yinghui LU Jiefang YANG Rong ZHANG Delong ZHAO Weiguo LIU Dan ZHANG Haixia XIAO key laboratory of Radar Meteorology and State key laboratory of severe weather China Meteorology Administration China Meteorological Administration Xiong'an atmospheric Boundary Layer key laboratory Hebei Provincial weather Modification Center school of atmospheric sciences Key Laboratory of Mesoscale Severe Weather/MOE and Frontiers Science Center for Critical Earth Material Cycling Nanjing University Department of atmospheric and Oceanic sciences School of Physics Peking University laboratory of Cloud-Precipitation Physics and severe Storms Institute of Atmospheric PhysicsChinese Academy of Sciences Cloud-Precipitation Physics and weather Modification key laboratory China Meteorology Administration Beijing weather Modification Center nanjing Joint Institute for atmospheric sciences

The process of riming significantly impacts the microphysical characteristics of clouds. This study uses aircraft and radar observation data in stratiform clouds with convection embedded that occurred in the central and southern regions of North China on 22 May 2017. The microphysical structural characteristics and processes near the embedded convection core and in the stratiform cloud are analyzed comparatively. Particular attention is given to the effect of riming on the microphysical properties near the upper boundary of the melting layer and to the factors influencing riming efficiency. The collaborative observations reveal that the particle size distributions observed near the convection core and in the stratiform region are close, while the particle properties like habit and riming degree are quite different. Above the melting layer,larger plate-like ice particles and supercooled water droplets(D > 50 μm) are more abundant near the convective core,leading to higher collision efficiencies between ice particles and supercooled water droplets. Larger fluctuation amplitudes of vertical airflow near the convective core also contribute to the increased riming activity and the formation of more heavily rimed particles, such as graupel. Furthermore, in situ measurements from airborne probes also revealed that above the melting layer, the riming process involves two stages: the mass of snow crystals grows as supercooled droplets merge internally without changing size, followed by external freezing that significantly enlarges the crystals.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ensemble Mean Forecast Skill and Applications with the T213 Ensemble Prediction System

引用

Advances in atmospheric sciences 2016年第11期33卷 1297-1305页

作者： Sijia LI Yuan WANG Huiling YUAN Jinjie SONG Xin XU key laboratory of mesoscale severe weather Ministry of EducationSchool of Atmospheric SciencesNanjing University

Ensemble forecasting has become the prevailing method in current operational weather forecasting. Although ensemble mean forecast skill has been studied for many ensemble prediction systems（EPSs） and different cases, theoretical analysis regarding ensemble mean forecast skill has rarely been investigated, especially quantitative analysis without any assumptions of ensemble members. This paper investigates fundamental questions about the ensemble mean, such as the advantage of the ensemble mean over individual members, the potential skill of the ensemble mean, and the skill gain of the ensemble mean with increasing ensemble size. The average error coefficient between each pair of ensemble members is the most important factor in ensemble mean forecast skill, which determines the mean-square error of ensemble mean forecasts and the skill gain with increasing ensemble size. More members are useful if the errors of the members have lower correlations with each other, and vice versa. The theoretical investigation in this study is verified by application with the T213 EPS. A typical EPS has an average error coefficient of between 0.5 and 0.8; the 15-member T213 EPS used here reaches a saturation degree of 95%（i.e., maximum 5% skill gain by adding new members with similar skill to the existing members） for 1–10-day lead time predictions, as far as the mean-square error is concerned.

关键词： skill ensemble Ensemble questions rarely verified forecast explain saturation discussion

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

Effects of Surface Drag on Upper-Level Frontogenesis within a Developing Baroclinic Wave

引用

Journal of Meteorological Research 2016年第5期30卷 706-718页

作者： ZHANG Yi TAN Zhemin CHU Kekuan key laboratory of mesoscale severe weather//MOE and School of Atmospheric Sciences Nanjing University Nanjing 210023

This paper investigates the effects of surface drag on upper-level front with a three-dimensional nonhy- drostatic mesoscale numerical model （MM5）. To this end, a new and simple potential vorticity intrusion （PVI） index is proposed to quantitatively describe the extent and path that surface drag affects upper-level front. From a PV perspective, the formation of the upper-level front is illustrated as the tropopause folding happens from the stratosphere. The PVI index shows a good correlation with the minimum surface pres- sure, and tends to increase with the deepening of the surface cyclone and upper-level front. The surface drag acts to damp and delay the development of upper-level front, which could reduce the growth rate of the PVI index. However, the damping presents different effects in different development stages. It is the most significant during the rapid development stage of the surface cyclone. Compared with no surface drag cases, the tropopause is less inclined to intrude into the troposphere due to the surface drag. Positive feedback between the surface cyclone and upper-level front could accelerate the development of the frontal system.

关键词： surface drag baroclinic wave upper-level front PV intrusion index

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

Adjoint Sensitivity Study on Idealized Explosive Cyclogenesis

引用

Journal of Meteorological Research 2016年第4期30卷 547-558页

作者：储可宽张熠 key laboratory of mesoscale severe weather/Ministry of Education and School of Atmospheric SciencesNanjing University

The adjoint sensitivity related to explosive cyclogenesis in a conditionally unstable atmosphere is investigated in this *** PSU/NCAR limited-area,nonhydrostatic primitive equation numerical model MM5 and its adjoint system are employed for numerical simulation and adjoint computation,*** ensure the explosive development of a baroclinic wave,the forecast model is initialized with an idealized condition including an idealized two-dimensional baroclinic jet with a balanced three-dimensional moderateamplitude disturbance,derived from a potential vorticity inversion ***,the validity period of the tangent linear model for this idealized baroclinic wave case is discussed,considering different initial moisture distributions and a dry ***,the 48-h forecast surface pressure center and the vertical component of the relative vorticity of the cyclone are selected as the response functions for adjoint computation in a dry and moist environment,*** preliminary results show that the validity of the tangent linear assumption for this idealized baroclinic wave case can extend to 48 h with intense moist convection,and the validity period can last even longer in the dry adjoint *** sensitivity analysis indicates that the rapid development of the idealized baroclinic wave is sensitive to the initial wind and temperature perturbations around the steering level in the ***,the moist adjoint sensitivity can capture a secondary high sensitivity center in the upper troposphere,which cannot be depicted in the dry adjoint run.

关键词： baroclinic wave explosive niidlatitude cyclone adjoint sensitivity potential vorticity inversion

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

Environmental Influences on the Intensity Change of Tropical Cyclones in the Western North Pacific

引用

Acta meteorologica Sinica 2013年第3期27卷 335-343页

作者：储惠芸伍荣生 key laboratory of mesoscale severe weather/Ministry of Education and School of Atmospheric Sciences Nanjing University key laboratory of mesoscale severe weather/Ministry of Education and School of Atmospheric SciencesNanjing University

The atmospheric and oceanic conditions are examined during different stages of the lifecycle of western North Pacific tropical cyclones （TCs）, with the intention to understand how the environment affects the intensity change of TCs in this area. It is found that the intensification usually occurs when the underlying sea surface temperature （SST） is higher than 26℃. TCs usually experience a rapid intensification when the SST is higher than 27.5℃ while lower than 29.5℃. However, TCs decay or only maintain its intensity when the SST is lower than 26℃. The intensifying TCs usually experience a low-to-moderate vertical wind shear （2-10 m s-l）. The larger the vertical wind shear, the slower the TCs strengthen. In addition, the convective available potential energy （CAPE） is much smaller in the developing stage than in the formation stage of TCs. For the rapidly intensifying TCs, the changes of SST, CAPE, and vertical wind shear are usually small, indicating that the rapid intensification of TCs occurs when the evolution of the environment is relatively slow.

关键词： tropical cyclone sea surface temperature convective available potential energy vertical windshear

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 New Mechanism of Convective Cell Regeneration and Development Within a Two-Dimensional Multicell Storm

引用

Acta meteorologica Sinica 2009年第4期23卷 413-427页

作者：鲍旭炜谈哲敏 key laboratory of mesoscale severe weather/MOE and School of Atmospheric Sciences Nanjing University

In this study, based on simulations of a two-dimensional multicell storm under a ground-layer upshear （Uz〈0） by a mesoscale numerical model, a new mechanism of cell regeneration and development within the multicell storm at the ＂less than optimal shear＂ *** proposed. In the presence of a ground-layer upshear, the circulation associated with the surface cold pool is not counteracted by that associated with the ambient wind sl^ear, and the density current extends out faster, making the multicell storm stay at the ＂less than optimal shear＂ state. As a result, a new cell is triggered by the strong vertical perturbation ahead of the mature convection, rather than by the split-up from the updraft at the leading edge of the surface cold pool as well as the gust front. The latter is the mechanism at the ＂optimal＂ state proposed by Lin et al. in 1998. In the new mechanism, the regenerated cell grows fast with the incident warm moist air from the upstream of the multicell storm, and tends to cut off the moist airflow into the mature convection at its western sector. Consequently, the mature convection would weaken, be replaced, and eventually decay. Actually, these two different mechanisms come into play in a way depending on the relationship between the circulation of the low-level shear and that of the cold pool. When the circulation of the cold pool is stronger than that of the wind shear, the multicell storm is at the ＂less than optimal shear＂ state, and the new convective cell is produced by the disturbance ahead of the mature cell. When the circulation of the cold pool is weaker, the cell regeneration is dominated by the mechanism at the ＂optimal＂ state, and the new cell is split from the gust front updraft. Therefore, these two mechanisms are not contradictive. With a moderate ground-layer upshear, they can alternately operate within a multicell storm.

关键词： multicell storm squall line low-level shear cold pool convective cell

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

Idealized Numerical Simulation Study of the Potential Vorticity Banners over a mesoscale Mountain: Dry Adiabatic Process

引用

Advances in atmospheric sciences 2009年第5期26卷 906-922页

作者：王其伟谈哲敏 key Lab of mesoscale severe weather/MOE School of Atmospheric Sciences Nanjing University

Topography-induced potential vorticity （PV） banners over a mesoscale topography （Dabie Mountain, hereafter DM） in eastern China, under an idealized dry adiabatic flow, are studied with a mesoscale numerical model, ARPS. PV banners generate over the leeside of the DM with a maximal intensity of ～1.5 PVU, and extend more than 100 km downstream, while the width varies from several to tens of kilometers, which contrasts with the half-width of the peaks along the ridge of the DM. Wave breaking occurs near the leeside surface of the DM, and leads to a strong PV generation. Combining with the PV generation, due to the friction and the flow splitting upstream, the PV is advected downstream, and then forms the PV banners over the DM. The PV banners are sensitive to the model resolution, Coriolis force, friction, subgrid turbulent mixing, stratification, the upstream wind speed and wind direction. The negative PV banners have a more compact connection with the low level turbulent kinetic energy. The PV banners are built up by the baroclinic and barotropic components. The barotropic-associated PV can identify the distribution of the PV banners, while the baroclinic one only has important contributions on the flanks and on the leeside near the topography. PV fluxes are diagnosed to investigate the influence of friction on the PV banners. Similar patterns are found between the total PV flux and the advective PV flux, except near the surface and inside the dipole of the PV banners, where the nonadvective PV flux associated with the friction has a net negative contribution.

关键词： potential vorticity banners surface friction turbulent kinetic energy Dabie Mountain

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：