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Performance of a Global Spectral Model with Dry Air-Mass and Total Air-Mass Conserving Dynamical Cores:A Case Study of the July 2021 Henan Extreme Rainfall Event

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Journal of Meteorological Research 2023年第1期37卷 20-44页

作者： xiangrong yang Weimin ZHANG Jun PENG Shaoying LI Jianping WU College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410600

This study investigates the effects of the assumption on the types of air-mass conservation prescribed in numerical models.First,predictions of the July 2021(“21.7”)Henan extreme rainfall event from the Integrated Forecast System(IFS)at ECMWF were compared with those from the Yin-He Global Spectral Model(YHGSM),which is a global spectral model with total air-mass conservation(TMC)and dry air-mass conservation(DMC)options.Then,a sensitivity test between simulations from the YHGSM adopting TMC and DMC was conducted.The results show that both the IFS and YHGSM predicted relatively well the 24-h rainfall amount less than 100 mm day−1 on 20 and 21 July 2021 at lead times of 84,60,and 36 h.For heavy precipitation exceeding 100 mm day−1,however,both models obviously underestimated the daily rainfall amount on 20 July 2021,but the YHGSM produced more precise and stable precipitation forecasts on these two days than the IFS,especially the maximum 24-h precipitation amount,with better consistency at lead times of 84,60,and 36 h.These differences are further examined in the sensitivity test.Predictions from the YHGSM with DMC show rainfall distributions and daily rainfall amounts closer to the observations at longer lead times.It is inferred that considering sources or sinks of total water in dynamical cores with DMC may have positive feedback for the precise prediction of condensates.For extreme rainfall events,the high local loss of total water may have caused a loss of the atmospheric mass,leading to an additional decrease in surface pressure.Subsequently,the unbalanced pressure gradient force enhances the cyclonic rotation of surface wind and strengthens convergence in the lower troposphere,which in turn further strengthens the vertical velocity,circularly contributing to the enhanced precipitation if the water vapor condition is favorable.

关键词： dry(total)air-mass conservation water source(sink) “21.7”Henan extreme rainfall global model

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Verification of a Modified Nonhydrostatic Global Spectral Dynamical Core Based on the Dry-Mass Vertical Coordinate: Three-Dimensional Idealized Test Cases

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Journal of Meteorological Research 2023年第3期37卷 286-306页

作者： Jun PENG Jianping WU xiangrong yang Jun ZHAO Weimin ZHANG Jinhui yang Fukang YIN College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073

The newly developed nonhydrostatic(NH)global spectral dynamical core is evaluated by using three-dimensional(3D)benchmark tests with/without moisture.This new dynamical core differs from the original Aladin-NH like one in the combined use of a dry-mass vertical coordinate and a new temperature variable,and thus,it inherently conserves the dry air mass and includes the mass sink effect associated with precipitation flux.Some 3D dry benchmark tests are first conducted,including steady state,dry baroclinic waves,mountain waves in non-sheared and sheared background flows,and a dry Held–Suarez test.The results from these test cases demonstrate that the present dynamical core is accurate and robust in applications on the sphere,especially for addressing the nonhydrostatic effects.Then,three additional moist test cases are conducted to further explore the improvement of the new dynamical core.Importantly,in contrast to the original Aladin-NH like one,the new dynamical core prefers to obtain simulated tropical cyclone with lower pressure,stronger wind speeds,and faster northward movement,which is much closer to the results from the Model for Prediction Across Scales(MPAS),and it also enhances the updrafts and provides enhanced precipitation rate in the tropics,which partially compensates the inefficient vertical transport due to the absence of the deep convection parameterization in the moist Held–Suarez test,thus demonstrating its potential value for full-physics global NH numerical weather prediction application.

关键词： nonhydrostatic global spectral dynamical core idealized tests mountain waves tropical cyclone

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Validation of the multi-satellite merged sea surface salinity in the South China Sea

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Journal of Oceanology and Limnology 2023年第6期41卷 2033-2044页

作者： Huipeng WANG Junqiang SONG Chengwu ZHAO xiangrong yang Hongze LENG Nan ZHOU College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Troop 61741 PLABeijing 100094China

Sea surface salinity(SSS)is an essential variable of ocean dynamics and climate research.The Soil Moisture and Ocean Salinity(SMOS),Aquarius,and Soil Moisture Active Passive(SMAP)satellite missions all provide SSS measurements.The European Space Agency(ESA)Climate Change Initiative Sea Surface Salinity(CCI-SSS)project merged these three satellite SSS data to produce CCI L4SSS products.We validated the accuracy of the four satellite products(CCI,SMOS,Aquarius,and SMAP)using in-situ gridded data and Argo floats in the South China Sea(SCS).Compared with in-situ gridded data,it shows that the CCI achieved the best performance(RMSD:0.365)on monthly time scales.The RMSD of SMOS,Aquarius,and SMAP(SMOS:0.389;Aquarius:0.409;SMAP:0.391)are close,and the SMOS takes a slight advantage in contrast with Aquarius and SMAP.Large discrepancies can be found near the coastline and in the shelf seas.Meanwhile,CCI with lower RMSD(0.295)perform better than single satellite data(SMOS:0.517;SMAP:0.297)on weekly time scales compared with Argo floats.Overall,the merged CCI have the smallest RMSD among the four satellite products in the SCS on both weekly time scales and monthly time scales,which illustrates the improved accuracy of merged CCI compared with the individual satellite data.

关键词： sea surface salinity(SSS) South China Sea(SCS) Argo multi-satellite merged data validation

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Effects of a Dry-Mass Conserving Dynamical Core on the Simulation of Tropical Cyclones

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大气科学进展：英文版 2023年第3期40卷 464-482页

作者： Shaoying LI Jun PENG Weimin ZHANG Jianping WU Qiang YAO xiangrong yang Tengling LUO College of Computer Science and Technology National University of Defense TechnologyChangsha 410073China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

The accurate forecasting of tropical cyclones(TCs)is a challenging task.The purpose of this study was to investigate the effects of a dry-mass conserving(DMC)hydrostatic global spectral dynamical core on TC simulation.Experiments were conducted with DMC and total(moist)mass conserving(TMC)dynamical cores.The TC forecast performance was first evaluated considering 20 TCs in the West Pacific region observed during the 2020 typhoon season.The impacts of the DMC dynamical core on forecasts of individual TCs were then estimated.The DMC dynamical core improved both the track and intensity forecasts,and the TC intensity forecast improvement was much greater than the TC track forecast improvement.Sensitivity simulations indicated that the DMC dynamical core-simulated TC intensity was stronger regardless of the forecast lead time.In the DMC dynamical core experiments,three-dimensional winds and warm and moist cores were consistently enhanced with the TC intensity.Drier air in the boundary inflow layer was found in the DMC dynamical core experiments at the early simulation times.Water vapor mixing ratio budget analysis indicated that this mainly depended on the simulated vertical velocity.Higher updraft above the boundary layer yielded a drier boundary layer,resulting in surface latent heat flux(SLHF)enhancement,the major energy source of TC intensification.The higher DMC dynamical core-simulated updraft in the inner core caused a higher net surface rain rate,producing higher net internal atmospheric diabatic heating and increasing the TC intensity.These results indicate that the stronger DMC dynamical coresimulated TCs are mainly related to the higher DMC vertical velocity.

关键词： dry mass conservation tropical cyclone intensity forecast track forecast

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新媒介时代的文学批评话语转型及其精神品格建构

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东岳论丛 2024年第5期45卷 41-47,191页

作者：杨向荣杭州师范大学人文学院浙江杭州311121 杭州师范大学文艺批评研究院杭州311121 杭州师范大学美学与艺术批评研究中心杭州311121

数字化的新媒介时代开启了一个迥异于传统的新文学场域,带来了文学内涵的嬗变和文学边界的位移,也带来了文学审美现实的变迁,以及文学批评话语的转型。新媒介时代的到来要求我们以一种开放的眼光来审视文艺现象,要在研究中融汇中西、融... 详细信息

数字化的新媒介时代开启了一个迥异于传统的新文学场域,带来了文学内涵的嬗变和文学边界的位移,也带来了文学审美现实的变迁,以及文学批评话语的转型。新媒介时代的到来要求我们以一种开放的眼光来审视文艺现象,要在研究中融汇中西、融合古今,吸收不同的理论资源来建构当下文学批评话语的精神品格。合理利用新媒介的技术向度,坚守本土经验立场,坚持批评的审美性、复调性和批判性品格,是建构当下文学批评理论话语精神品格的关键所在。

关键词：新媒介时代文学批评话语转型精神品格

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重读瓦尔堡:被忽略的图像叙事建构

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浙江社会科学 2024年第5期 126-135,160页

作者：杨向荣孙元杭州师范大学文艺批评研究院、人文学院杭州师范大学美学与艺术批评研究中心杭州师范大学人文学院杭州311121

在瓦尔堡的图像学思想中,图像的叙事建构是他一直关注的主题,也是一个被学界所忽略的话题。瓦尔堡提出“运动附属物”概念,在图像细节边缘处寻找符号的叙事隐义。瓦尔堡认为图像叙事隐藏着古代世界的文化遗存,这种文化遗存通过“情念程... 详细信息

在瓦尔堡的图像学思想中,图像的叙事建构是他一直关注的主题,也是一个被学界所忽略的话题。瓦尔堡提出“运动附属物”概念,在图像细节边缘处寻找符号的叙事隐义。瓦尔堡认为图像叙事隐藏着古代世界的文化遗存,这种文化遗存通过“情念程式”和“极性”的形式表现出来。瓦尔堡的图像叙事呈现出互图叙事的特点,他通过图像间的对话,以蒙太奇的方式展示图像群的互动意义建构。瓦尔堡的研究呈现出跨学科的视域,他试图运用一切可以获得的理论资源,建立一种他称之为“文化科学”的研究范式。瓦尔堡的图像叙事思想提供了图像学研究的新的参照系,它从一个新的角度展现了不同学科面对同一主题的互证与互释关系。

关键词：瓦尔堡细节叙事互图叙事跨学科范式

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Asymmetric Distribution of Convection in Tropical Cyclones over the Western North Pacific Ocean

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Advances in Atmospheric Sciences 2016年第11期33卷 1306-1321页

作者： Lu yang Jianfang FEI Xiaogang HUANG Xiaoping CHENG xiangrong yang Juli DING Wenli SHI Institute of Meteorology and Oceanography PLA University of Science and Technology

Forecasts of the intensity and quantitative precipitation of tropical cyclones（TCs） are generally inaccurate, because the strength and structure of a TC show a complicated spatiotemporal pattern and are affected by various factors. Among these, asymmetric convection plays an important role. This study investigates the asymmetric distribution of convection in TCs over the western North Pacific during the period 2005–2012, based on data obtained from the Feng Yun 2（FY2）geostationary satellite. The asymmetric distributions of the incidence, intensity and morphology of convections are analyzed.Results show that the PDFs of the convection occurrence curve to the azimuth are sinusoidal. The rear-left quadrant relative to TC motion shows the highest occurrence rate of convection, while the front-right quadrant has the lowest. In terms of intensity, weak convections are favored in the front-left of a TC at large distances, whereas strong convections are more likely to appear to the rear-right of a TC within a 300 km range. More than 70% of all MCSs examined here are elongated systems, and meso-β enlongated convective systems（MβECSs） are the most dominant type observed in the outer region of a TC. Smaller MCSs tend to be more concentrated near the center of a TC. While semi-circular MCSs [MβCCSs, MCCs（mesoscale convective complexes）] show a high incidence rate to the rear of a TC, elongated MCSs [MβECSs, PECSs（persistent elongated convective systems）] are more likely to appear in the rear-right quadrant of a TC within a range of 400 km.

关键词： convection Tropical convective asymmetric tropical mesoscale elongated typhoon likely storm

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侧卷流和复合卷流燃烧系统混合燃烧特性

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内燃机学报 2024年第1期42卷 1-10页

作者：常江李向荣刘洋谢亮陈彦林刘栋北京理工大学机械与车辆学院北京100081 特种车辆研究所北京100072 河北华北柴油机有限责任公司河北石家庄050081

为研究侧卷流燃烧系统(LSCS)和复合卷流燃烧系统(MSCS)对直喷式柴油机性能的影响,通过单缸柴油机台架开展了LSCS和MSCS的燃烧性能试验,结合仿真分析,揭示了LSCS和MSCS的缸内油、气混合特性.结果表明:在小负荷和高过量空气系数φ_(a)下,M... 详细信息

为研究侧卷流燃烧系统(LSCS)和复合卷流燃烧系统(MSCS)对直喷式柴油机性能的影响,通过单缸柴油机台架开展了LSCS和MSCS的燃烧性能试验,结合仿真分析,揭示了LSCS和MSCS的缸内油、气混合特性.结果表明:在小负荷和高过量空气系数φ_(a)下,MSCS体现出较好的燃烧性能,相比于LSCS,其燃油消耗率最大降幅为3.6 g/(kW·h),碳烟排放最大降幅为0.13 g/(kW·h),燃烧持续期最大降幅为2.6°CA;但在大负荷和低φ_(a)下,LSCS体现出更好的燃烧性能,相比于MSCS,其燃油消耗率最大降幅为2.6 g/(kW·h),碳烟排放最大降幅为0.56 g/(kW·h),燃烧持续期最大降幅为2.8°CA.仿真结果表明:随负荷减小或φ_(a)增大,燃油射流贯穿能力减弱,复合卷流燃烧室的弧脊能更有效地提升油、气混合质量;随负荷增大或φ_(a)减小,燃油射流贯穿能力增强,复合卷流燃烧室的弧脊阻碍了燃油射流扩散,侧卷流燃烧室的分流造型能更显著地改善油、气混合过程.

关键词：直喷式柴油机侧卷流燃烧系统复合卷流燃烧系统

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Formation Mechanism and Numerical Model of Quartz in Fine-Grained Organic-Rich Shales: A Case Study of Wufeng and Longmaxi Formations in Western Hubei Province, South China

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Journal of Earth Science 2020年第2期31卷 354-367页

作者： Bao Zhang Detian Yan Hassan Jasmine Drawarh xiangrong yang Jin He Liwei Zhang Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China

The difference in quartz types in shales not only affects the porosity and permeability of the rocks,but also reflects the difference in the sedimentary environments.We established the formation mechanism and numerical model of quartz in shales of Wufeng and Longmaxi formations in the Wangjiawan Section,South China,based on thin-section studies using SEM(scanning electron microscope),SEM-CL(cathodoluminescence),XRD(X-ray diffraction)and geochemical analyses.There are two types of quartz in the shales:detrital quartz and authigenic quartz.Detrital quartz is mostly silt-size,typically ranging from 10 to 60μm in size and subangular to angular monocrystal in shape,and brighter than authigenic quartz by CL intensity;authigenic quartz is present in two phases in shape:grain overgrowths and crystallite grains.Overgrowth surfaces are subhedral.Crystallite grains are typically less than 10μm in size,euhedral or subhedral monocrystal in shape.Authigenic quartz can be subdivided into biogenic quartz and clay mineral transformed quartz according to the source of silicon.In the numerical model,the content of detrital quartz is relatively consistent(20%);the content of biogenic quartz ranges from 40%to 70%,with a sharp fall(0–30%)in the Guanyinqiao mudstone.During the Katian,a lower anoxic and dense water column make the dissolution of biogenic silica well preserved.Biogenic quartz is the major contributor to the sediment.During the early Hirnantian interval,due to the drop of sea level and the oxygenation of seafloor,the sediment is mainly composed of clay transformed quartz and detrital quartz.During the latest Hirnatian and Rhuddanian,rapid sea level rise and anoxic ocean enhance the preservation of the biogenic silica,thereby biogenic quartz re-emerges as the major contributors to the sediment.Authigenic crystallite grains and grain overgrowths have filled in primary pore space and have decreased the interparticle porosity,however,as a rigid framework,they can suppress compaction and maintain the internal pore structure.Th

关键词： brittle mineral quartz Wufeng and Longmaxi formations formation mechanism numerical simulation

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基于物种敏感度分布的微塑料生态毒性评估:挑战与思考

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海洋环境科学 2024年第2期43卷 214-216页

作者：羊童林朗裘文慧徐向荣麦吉尔大学土木工程系魁北克蒙特利尔H3A0C3 中国科学院南海海洋研究所热带海洋生物资源与生态重点实验室广东广州510301 南方科技大学环境科学与工程学院广东省土壤与地下水污染防控及修复重点实验室广东深圳518055 三亚海洋生态环境工程研究院海南三亚572000

物种敏感度分析(species sensitivity distributions,SSD)作为被广泛接受的生态毒性评价方法,近年来被用于理解和推导微塑料的环境安全阈值。由于缺乏统一的毒理测试标准,加上微塑料本身性质的多样性以及微塑料污染的积累性,微塑料的生... 详细信息

物种敏感度分析(species sensitivity distributions,SSD)作为被广泛接受的生态毒性评价方法,近年来被用于理解和推导微塑料的环境安全阈值。由于缺乏统一的毒理测试标准,加上微塑料本身性质的多样性以及微塑料污染的积累性,微塑料的生态毒性难以被准确评估。基于上述挑战,本文提出引入半定量体系评价毒理学数据以及构建分类数据子集的方法,来提高SSD技术在预测微塑料环境安全阈值中的准确性,可为未来评估微塑料的生态毒性提供重要依据。

关键词：风险表征塑料碎片生态风险

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