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Numerical simulations of Atlantic meridional overturning circulation(AMOC)from OMIP experiments and its sensitivity to surface forcing

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Journal of Oceanology and Limnology 2024年第2期42卷 454-467页

作者： Xiaowei WANG yongqiang yu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Atlantic meridional overturning circulation(AMOC)plays an important role in transporting heat meridionally in the Earth’s climate system and is also a key metrical tool to verify oceanic general circulation *** OMIP(Ocean Model Intercomparison Project phase 1 and 2)simulations with LICOM3(version 3 of the LASG/IAP Climate System Ocean Model)developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics(IAP),are compared in this *** simulations well reproduce the fundamental characteristics of the AMOC,but the OMIP1 simulation shows a significantly stronger AMOC than the OMIP2 *** the LICOM3 configurations are identical between these two experiments,any differences between them must be attributed to the surface forcing *** analysis suggests that sea surface salinity(SSS)differences should be mainly responsible for the enhanced AMOC in the OMIP1 simulation,but sea surface temperature(SST)also play an unignorable role in modulating *** the North Atlantic,where deep convection occurs,the SSS in OMIP1 is more saline than that in *** find that in the major region of deep convection,the change of SSS has more significant effect on density than the change of *** a result,the SSS was more saline than that in OMIP2,leading to stronger deep convection and subsequently intensify the *** conduct a series of numerical experiments with LICOM3,and the results confirmed that the changes in SSS have more significant effect on the strength of AMOC than the changes in SST.

关键词： oceanic general circulation model(OGCM) Atlantic meridional overturning(AMOC) surface forcing deep convection

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非均相钌催化高铁酸盐氧化降解苯酚

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环境化学 2024年第3期43卷 783-789页

作者：于永强何佳豪张静重庆大学环境与生态学院重庆400045 哈尔滨工业大学环境学院哈尔滨150090

本研究开发了以ZSM-5、TiO_(2)和CeO_(2)为载体的非均相钌(Ru)催化剂,并检验了其催化高铁酸盐(Fe(Ⅵ))氧化苯酚的性能.随着Ru/ZSM-5、Ru/TiO_(2)或Ru/CeO_(2)催化剂投加量的增加,Fe(Ⅵ)氧化苯酚的伪一级反应速率常数(kobs,min-1)呈线性... 详细信息

本研究开发了以ZSM-5、TiO_(2)和CeO_(2)为载体的非均相钌(Ru)催化剂,并检验了其催化高铁酸盐(Fe(Ⅵ))氧化苯酚的性能.随着Ru/ZSM-5、Ru/TiO_(2)或Ru/CeO_(2)催化剂投加量的增加,Fe(Ⅵ)氧化苯酚的伪一级反应速率常数(kobs,min-1)呈线性增长趋势.催化剂的效能主要取决于载体上钌纳米颗粒的分散情况,受钌负载量的影响不明显.虽然Ru/ZSM-5的Ru载量最低,但ZSM-5的比表面积较高,且Ru在ZSM-5表面的分散性好,使其催化效能与另外两种催化剂相当.非均相钌催化性能受pH影响很大,在pH 5.0—9.0时显著提高了苯酚的去除率.Ru的催化机理为Ru III被Fe(Ⅵ)氧化为Ru^(Ⅶ)中间体,Ru^(Ⅶ)具有较高活性和氧化能力,可以快速氧化苯酚,从而促进Fe(Ⅵ)氧化苯酚的速率.研究通过连续10次重复使用实验考察了3种催化剂的稳定性,证明Ru/CeO_(2)和Ru/TiO_(2)的稳定性优于Ru/ZSM-5,Ru/ZSM-5稳定性下降的主要原因是ZSM-5比表面积较大,更容易吸附Fe(Ⅵ)的还原产物——氢氧化铁,从而使得Ru活性位点被氢氧化铁掩盖.

关键词：钌高铁酸盐动力学机理苯酚

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进口导叶对S-CO_(2)离心压缩机内部流动及性能的影响研究

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中国电机工程学报 2024年第19期44卷 7717-7725,I0019页

作者：裴瑾泽王绍成赵钊于泳强赵远扬青岛科技大学机电工程学院山东省青岛市266061 北京航天动力研究所北京市丰台区100076

超临界二氧化碳(supercritical carbon dioxide,S-CO_(2))布雷顿循环被认为是具有前景的动力循环之一,S-CO_(2)压缩机性能对循环热效率有很大影响。该文以带进口导叶的S-CO_(2)离心压缩机为研究对象,采用数值模拟方法探究预旋角度对S-CO... 详细信息

超临界二氧化碳(supercritical carbon dioxide,S-CO_(2))布雷顿循环被认为是具有前景的动力循环之一,S-CO_(2)压缩机性能对循环热效率有很大影响。该文以带进口导叶的S-CO_(2)离心压缩机为研究对象,采用数值模拟方法探究预旋角度对S-CO_(2)离心压缩机内部流动和性能的影响。结果表明:预旋角绝对值的增大会加剧导叶吸力面侧的流动分离,导叶段总压损失与叶轮进口处流动不均匀程度也随之增大;随着正预旋角度增大,叶轮进口处相对气流角和相对速度减小,叶片吸力面侧膨胀加速和流动分离减弱;较大的正预旋角度会导致大流量工况下进口导叶段出现两相区流体。该文研究结果可为S-CO_(2)离心压缩机进口导叶调节提供一定参考。

关键词：离心压缩机导叶超临界二氧化碳布雷顿循环流动分析

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黑水虻利用有机固废开发新型饲料蛋白与碳减排研发现状和展望

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饲料工业 2024年第8期45卷 1-8页

作者：张吉斌余永强禹铭洋张珈华中农业大学农业微生物资源发掘与利用全国重点实验室湖北洪山实验室生命科学技术学院微生物农药国家工程研究中心湖北武汉430070

黑水虻作为一种重要的资源昆虫,可以处理多种有机固废,收获虫体生物质。黑水虻虫体富含蛋白质、脂肪等营养物质,在畜禽与水产的饲料中可有效替代鱼粉和豆粕而作为新型饲料蛋白资源。黑水虻幼虫处理有机固废还可以有效减少处理过程中的... 详细信息

黑水虻作为一种重要的资源昆虫,可以处理多种有机固废,收获虫体生物质。黑水虻虫体富含蛋白质、脂肪等营养物质,在畜禽与水产的饲料中可有效替代鱼粉和豆粕而作为新型饲料蛋白资源。黑水虻幼虫处理有机固废还可以有效减少处理过程中的碳排放,将更多的碳元素以有机物的形式固定在虫体生物质上。文章从以下几个方面进行了综述:黑水虻转化不同有机固废,及其不同废弃物搭配对黑水虻转化及黑水虻营养的影响;微生物对黑水虻转化有机固废获得黑水虻生物质、蛋白的影响;黑水虻转化有机固废的无害化;黑水虻替代鱼粉和豆粕,是极具潜力的新型“开源”饲料蛋白;黑水虻中功能性蛋白(肽)的开发利用-用于饲料蛋白“节流”;黑水虻在固碳减排方面的作用;同时对黑水虻未来研究与开发方向进行了展望,以期为黑水虻资源的开发利用提供参考。

关键词：黑水虻有机固废新型饲料蛋白功能蛋白(肽) 碳减排

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基于改进Mask R-CNN的青菜杂质检测研究

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中国农机化学报 2024年第9期45卷 77-82,140页

作者：赵爽俞永强苗玉彬刘可心上海电机学院机械学院上海市201100 上海交通大学机械与动力工程学院上海市201100

绿叶蔬菜的智能包装加工是实现绿叶蔬菜智能化生产、降低生产成本的重要部分,对绿叶蔬菜在包装加工时的杂质检测是其重要前提。以青菜为研究对象,提出一种基于Mask R-CNN的青菜杂质检测模型。首先采集标注掺杂枯树叶、枯菜叶和碎纸片3... 详细信息

绿叶蔬菜的智能包装加工是实现绿叶蔬菜智能化生产、降低生产成本的重要部分,对绿叶蔬菜在包装加工时的杂质检测是其重要前提。以青菜为研究对象,提出一种基于Mask R-CNN的青菜杂质检测模型。首先采集标注掺杂枯树叶、枯菜叶和碎纸片3种常见杂质的青菜图像1370多张,并通过数据增强的方法扩充建立含有2740张青菜杂质图像的数据集。为减少背景对杂质检测的影响,通过在Mask R-CNN模型中加入协调注意力机制,同时添加全连接层和Dropout层,增强模型特征提取能力,减少过拟合现象,并使用迁移学习方法对模型进行微调。结果表明改进后的Mask R-CNN算法对青菜杂质识别的平均精度均值为99.19%,检测速度为8.45 FPS,检测效果良好,可以满足青菜杂质的检测需求。

关键词：青菜杂质检测 Mask R-CNN 迁移学习协调注意力

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考虑铸造约束的空间结构节点拓扑优化设计研究

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建筑结构学报 2024年第10期45卷 170-180页

作者：韩文哲王超杜文风余永强徐斌河南理工大学土木工程学院河南焦作454003 河南大学土木建筑学院河南开封475004 西北工业大学力学与土木建筑学院陕西西安710072

针对工业化批量生产的高性能可铸造性空间结构节点设计问题,引入集成铸造约束的连续体结构拓扑优化方法,对典型空间结构节点进行了拓扑优化设计研究。建立了多荷载工况下协同考虑铸造约束和材料体积约束的节点域应变能最小化(等价于节... 详细信息

针对工业化批量生产的高性能可铸造性空间结构节点设计问题,引入集成铸造约束的连续体结构拓扑优化方法,对典型空间结构节点进行了拓扑优化设计研究。建立了多荷载工况下协同考虑铸造约束和材料体积约束的节点域应变能最小化(等价于节点刚度最大化)优化模型,利用阈值投影技术抑制密度过滤导致的大量中间密度单元以改善设计性能,通过MATLAB实现优化程序。以经典3D四耳板空间结构节点为设计对象,进行了有无铸造约束的空间结构节点拓扑优化对比研究,并分析了不同过滤半径、荷载工况、材料体积以及网格密度对节点优化设计的影响规律。研究结果表明:传统优化设计方法不能确保空间结构节点设计满足铸造工艺要求,引入铸造约束是解决这一难题的必要且可行方法;降低过滤半径和提高材料用量将有助于增强节点设计刚度,细化有限元网格能够改善节点设计质量,但将大幅增加计算成本。

关键词：空间结构节点拓扑优化铸造约束可制造性设计

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The Hiatus and Accelerated Warming Decades in CMIP5 Simulations

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Advances in Atmospheric Sciences 2014年第6期31卷 1316-1330页

作者： SONG Yi yu yongqiang LIN Pengfei State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth Science University of the Chinese Academy of Sciences

Observed hiatus or accelerated warming phenomena are compared with numerical simulations from the Coupled Model Intercomparison Project Phase 5 （CMIP5） archives,and the associated physical mechanisms are explored based on the CMIP5 *** trends in total ocean heat content （OHC） are strongly constrained by net top-of-atmosphere （TOA） *** hiatus decades,most CMIP5 models exhibit a significant decrease in the SST and upper OHC and a significant increase of heat penetrating into the subsurface or deep ocean,opposite to the accelerated warming *** shallow meridional overturning of the Pacific subtropical cell experiences a significant strengthening （slowdown） for the hiatus （accelerated warming） decades associated with the strengthened （weakened） trade winds over the tropical *** surface heating and ocean dynamics contribute to the decadal changes in SST over the Indian Ocean,and the Indonesian Throughflow has a close relationship with the changes of subsurface temperature in the Indian *** Atlantic Meridional Overturing Circulation （Antarctic Bottom Water） tends to weaken （strengthen） during hiatus decades,opposite to the accelerated warming *** short,the results highlight the important roles of air-sea interactions and ocean circulations for modulation of surface and subsurface temperature.

关键词： global warming decadal variability CMIP5 hiatus

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Sensitivity of Atlantic Meridional Overturning Circulation to the Dynamical Framework in an Ocean General Circulation Model

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Journal of Meteorological Research 2017年第3期31卷 490-501页

作者： Xiaolan LI yongqiang yu Hailong LIU Pengfei LIN State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

The horizontal coordinate systems commonly used in most global ocean models are the spherical latitude-longit- ude grid and displaced poles, such as a tripolar grid. The effect of the horizontal coordinate system on Atlantic meri- dional overturning circulation （AMOC） is evaluated by using an OGCM （ocean general circulation model）. Two ex- periments are conducted with the model---one using a latitude-longitude grid （referred to as Latl） and the other us- ing a tripolar grid （referred to as Tri）. The results show that Tri simulates a stronger North Atlantic deep water （NADW） than Lat_l, as more saline water masses enter the Greenland-Iceland-Norwegian （GIN） seas in Tri. The stronger NADW can be attributed to two factors. One is the removal of the zonal filter in Tri, which leads to an in- creasing of the zonal gradient of temperature and salinity, thus strengthening the north geostrophic flow. In turn, it decreases the positive subsurface temperature and salinity biases in the subtropical regions. The other may be associ- ated with topography at the North Pole, because realistic topography is applied in the tripolar grid while the latitude-longitude grid employs an artificial island around the North Pole. In order to evaluate the effect of the filter on AMOC, three enhanced filter experiments are carried out. Compared to Lat_l, an enhanced filter can also aug- ment NADW formation, since more saline water is suppressed in the GIN seas, but accumulated in the Labrador Sea, especially in experiment Lat_2 S, which is the experiment with an enhanced filter on salinity.

关键词： AMOC OGCM tripolar grid latitude-longitude grid zonal filter

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大气CO_(2)和古地理共同控制新生代印太暖池的演化

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Science Bulletin 2024年第9期69卷 1323-1331页

作者：张冉柳中晖姜大膀俞永强张仲石杨一博谭宁司东张强周鑫 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China Department of Earth Sciences The University of Hong KongHong Kong 999077China Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan 430074China State Key Laboratory of Tibetan Plateau Earth System Science Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China

The Indo-Pacific warm pool(IPWP) is crucial for regional and global climates. However, the development of the IPWP and its effect on the regional climate during the Cenozoic remain unclear. Here, using a compilation of sea surface temperature(SST) records(mainly since the middle Miocene) and multimodel paleoclimate simulations, our results indicated that the extent, intensity and warmest temperature position of the IPWP changed markedly during the Cenozoic. Specifically, its extent decreased, its intensity weakened, and its warmest temperature position shifted from the Indian to western Pacific Ocean over time. The atmospheric CO_(2) dominated its extent and intensity, while paleogeography, by restricting the distribution of the Indian Ocean and the width of the tropical seaways, controlled the shift in its warmest temperature position. In particular, the eastward shift to the western Pacific Ocean from the middle to late Miocene inferred from compiled SST records likely resulted from the constriction of tropical seaways. Furthermore, by changing the atmospheric thermal structure and atmospheric circulation,the reduced extent and intensity of the IPWP decreased the annual precipitation in the western Indian Ocean, eastern Asia and Australia, while the shift in the warmest temperature position from the Indian to western Pacific Ocean promoted aridification in Australia. Qualitative model-data agreements are obtained for both the IPWP SST and regional climate. From the perspective of past warm climates with high concentrations of atmospheric CO_(2), the expansion and strengthening of the IPWP will occur in a warmer future and favor excessive precipitation in eastern Asia and Australia.

关键词： Indo-Pacific warm pool Cenozoic Atmospheric CO_(2) Paleogeography

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Distinct Evolution of the SST Anomalies in the Far Eastern Pacific between the 1997/98 and 2015/16 Extreme El Niños

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Advances in Atmospheric Sciences 2022年第6期39卷 927-942页

作者： Shaolei TANG Jing-Jia LUO Lin CHEN yongqiang yu Institute for Climate and Application Research(ICAR) Nanjing University of Information Science and TechnologyNanjing 210044China Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/ILCEC/CIC-FEMDNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

The 2015/16 El Niño displayed a distinct feature in the SST anomalies over the far eastern Pacific(FEP)compared to the 1997/98 extreme *** contrast to the strong warm SST anomalies in the FEP in the 1997/98 event,the FEP warm SST anomalies in the 2015/16 El Niño were modest and accompanied by strong southeasterly wind anomalies in the southeastern *** possible underlying causes of this distinct difference in the FEP may improve understanding of the diversity of extreme El Niñ***,we employ observational analyses and numerical model experiments to tackle this ***-layer heat budget analysis suggests that compared to the 1997/98 event,the modest FEP SST warming in the 2015/16 event was closely related to strong vertical upwelling,strong westward current,and enhanced surface evaporation,which were caused by the strong southeasterly wind anomalies in the southeastern *** strong southeasterly wind anomalies were initially triggered by the combined effects of warm SST anomalies in the equatorial central and eastern Pacific(CEP)and cold SST anomalies in the southeastern subtropical Pacific in the antecedent winter,and then sustained by the warm SST anomalies over the northeastern subtropical Pacific and *** contrast,southeasterly wind anomalies in the 1997/98 El Niño were partly restrained by strong anomalously negative sea level pressure and northwesterlies in the northeast flank of the related anomalous cyclone in the subtropical South *** addition,the strong southeasterly wind and modest SST anomalies in the 2015/16 El Niño may also have been partly related to decadal climate variability.

关键词： El Nño-Southern Oscillation extreme El Niño El Niño diversity far eastern Pacific decadal climate variability

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