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Changes in Spring Snow Cover over the Eastern and Western Tibetan Plateau and Their Associated Mechanism

Advances in Atmospheric Sciences 2024年第5期41卷 959-973页

作者： Fangchi LIU xiaojing jia Wei DONG Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouZhejiang 310058China

The spring snow cover(SC)over the western Tibetan Plateau(TP)(TPSC)(W_TPSC)and eastern TPSC(E_TPSC)have displayed remarkable decreasing and increasing trends,respectively,during 1985–*** current work investigates the possible mechanisms accounting for these distinct TPSC *** results indicate that the decrease in W_TPSC is primarily attributed to rising temperatures,while the increase in E_TPSC is closely linked to enhanced *** circulation analysis shows that the essential system responsible for the TPSC changes is a significant anticyclonic system centered over the northwestern *** anomalous descending motion and adiabatic heating linked to this anticyclone leads to warmer temperatures and consequent snowmelt over the western ***,anomalous easterly winds along the southern flank of this anticyclone serve to transport additional moisture from the North Pacific,leading to an increase in snowfall over the eastern *** analysis reveals that the anomalous anticyclone is associated with an atmospheric wave pattern that originates from upstream *** warming of the subtropical North Atlantic(NA)sea surface temperature(SST)induces an atmospheric pattern resembling a wave train that travels eastward across the Eurasian continent before reaching the ***,the decline in winter sea ice(SIC)over the Barents Sea exerts a persistent warming influence on the atmosphere,inducing an anomalous atmospheric circulation that propagates southeastward and strengthens the northwest TP anticyclone in ***,an enhancement of subtropical stationary waves has resulted in significant increases in easterly moisture fluxes over the coastal areas of East Asia,which further promotes more snowfall over eastern TP.

关键词： snow cover Tibetan Plateau long-term changes spring

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Molecular Cloning and Tissue-specific Expression of Cu/Zn and Mn-superoxide Dismutase in the Three-keeled Pond Turtle, Chinemys reevesii

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Asian Herpetological Research 2013年第2期4卷 79-89页

作者： xiaojing jia Cuijuan NIU Ministry of Education Key Laboratory of Biodiversity Science and Ecological Engineering College of Life SciencesBeijing Normal University

Both copper/zinc superoxide dismutase （SOD; Cu/Zn-SOD, SOD1） cDNA and manganese SOD （Mn-SOD, SOD2） cDNA were cloned for the first time from the three-keeled pond turtle, Chinemys reevesii, using RT-PCR and RACE methods in this work. The SOD1 cDNA was 749 bp long and consisted of a 32-bp 5＇-untranslated region （UTR）, a 249-bp 3＇-UTR, and a 468-bp open reading frame （ORF） encoding a 155-amino-acid protein with 16.0 kDa predicted molecular mass and 5.95 theoretical isoelectric point （p/）. The SOD2 cDNA was 1687 bp long and comprised 94-bp of 5＇-UTR, 912-bp 3＇-UTR and 681-bp ORF encoding a 226-amino-acid protein with 25.0 kDa predicted molecular mass and 8.83 pI. The deduced amino acid sequence of SOD1 showed relatively high similarity （77.4%-87.1%） and identity （65.4%-74.4%） with the published sequences of SOD1 from other vertebrate species, whereas SOD2 protein shared slightly higher similarity （83.6%-95.6%） and identity （76.1%-88.9%） with other reported vertebrates SOD2s. Phylogenetic analysis revealed that the C. reevesii SOD1 and SOD2 were separately clustered together, and were highly conserved during evolution. Both SOD mRNA expression was detected widely in the brain, liver, muscle, kidney, gut, spleen, lung and heart at variable levels. The highest expression of the two SODs was observed in muscle, and followed in brain, liver, kidney, gut and heart, whereas low transcriptional levels were found in spleen and lung. Meanwhile, high activity of SOD 1 was kept in brain, liver, muscle, kidney and heart, and followed in gut, spleen and lung. The activities of SOD2 in brain, liver, muscle, kidney, gut and heart were significantly higher than those in spleen and lung.

关键词： Chinemys reevesii SOD 1 SOD2 cDNA cloning mRNA expression

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The Impact of Tibetan Plateau Snow Cover on the Summer Temperature in Central Asia

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Advances in Atmospheric Sciences 2022年第7期39卷 1103-1114页

作者： Xuke LIU xiaojing jia Min WANG Qifeng QIAN Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouZhejiang 310027China

The current work examines the impact of the snow cover extent(SCE)of the Tibetan Plateau(TP)on the interannual variation in the summer(June−July−August)surface air temperature(SAT)over Central Asia(CA)(SAT_CA)during the 1979−2019 *** leading mode of the summer SAT_CA features a same-sign temperature anomalies in CA and explains 62%of the total variance in SAT_*** atmospheric circulation associated with a warming SAT_CA is characterized by a pronounced high-pressure system dominating *** high-pressure system is accompanied by warm advection as well as descending motion over CA,favoring the warming of the SAT_*** shows that the interannual variation in the summer SAT_CA is significantly positively correlated with the April SCE over the central-eastern *** April,higher than normal SCE over the central-eastern TP has a pronounced cooling effect on the column of the atmosphere above the TP and can persist until the following early *** and positive height anomalies appear above and to the west of the *** the following months,the perturbation forcing generated by the TP SCE anomalies lies near the western center of the Asian subtropical westerly jet(SWJ),which promotes atmospheric waves in the zonal direction guided by the Asian *** with this atmospheric wave,in the following summer,a significant high-pressure system dominates CA,which is a favorable condition for a warm summer SAT_CA.

关键词： snow cover extent the Tibetan Plateau Central Asia SAT summer

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Analysis of lower-boundary climate factors contributing to the summer heatwave frequency over eastern Europe using a machine-learning model

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Atmospheric and Oceanic Science Letters 2022年第5期15卷 49-54页

作者： Ruizhi Zhang xiaojing jia Qifeng Qian Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouChina Zhejiang Institute of Meteorological Science(Chinese Academy of Meteorological Sciences Zhejiang Branch)HangzhouChina

A machine-learning(ML)model,the light gradient boosting machine(LightGBM),was constructed to simulate the variation in the summer(June-July-August)heatwave frequency(HWF)over eastern Europe(HWFUR)and to analyze the contributions of various lower-boundary climate factors to the HWFUR *** examined lower-boundary climate factors were those that may contribute to the HWFUR variation—namely,the sea surface temperature,soil moisture,snow-cover extent,and sea-ice concentration from the simultaneous summer,preceding spring,and *** selected climate factors were significantly correlated to the summer HWFUR variation and were used to construct the ML *** the hindcast simulation of HWF EUR for the period 1981-2020 and its real-time simulation for the period 2011-2020,which used the constructed ML model,were *** evaluate the contributions of the climate factors,various model experiments using different combinations of the climate factors were examined and *** results indicated that the LightGBM model had comparatively good performance in simulating the HWFUR *** sea surface temperature made more contributions to the ML model simulation than the other climate *** examination showed that the best ML simulation was that which used the climate factors in the preceding winter,suggesting that the lower-boundary conditions in the preceding winter may be critical in forecasting the summer HWFUR variation.

关键词： Heatwave frequency Eastern Europe Summer Machine learning

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系统动力学运算过程图分析方法——以供应链模型参数调控延迟计算为例

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系统工程理论与实践 2020年第12期40卷 3270-3283页

作者：贾晓菁贾仁安祝琴中央财经大学商学院北京100081 南昌大学管理学院系统工程研究所南昌330031

针对系统动力学仿真方法存在的两个问题,一是仿真结果的数值输出,其数值大小动态变化过程直观性差,不利于理解与应用;二是因仿真程序内涵与计算过程被隐藏,使得流图模型的因果链、仿真方程、仿真程序、仿真数值结果间的内在关系不能较... 详细信息

针对系统动力学仿真方法存在的两个问题,一是仿真结果的数值输出,其数值大小动态变化过程直观性差,不利于理解与应用;二是因仿真程序内涵与计算过程被隐藏,使得流图模型的因果链、仿真方程、仿真程序、仿真数值结果间的内在关系不能较好地展示出来.论文以供应链模型的仿真数值输出为例,首先将流图的因果链与仿真方程相结合建立运算因果链,将运算因果链与仿真方程相结合建立数据过程顶点,进而将数据过程顶点集合与运算因果链组合成"运算过程图",展示变量顶点值计算过程,解决仿真数值输出难以理解的问题.接着,进行单参数调控延迟量的仿真规律研究,推导出单参数调控延迟量计算的2个定理,为相关参数调控的延迟计算及理论分析提供依据.文章提出的运算过程图具有3个功能:1)直观展示仿真数值计算过程;2)揭示系统动态变化规律,为模型仿真规律展示和研究提供一个新平台;3)验证系统动力学模型的可靠性.

关键词：运算过程图系统动力学供应链参数调控延迟数据过程顶点

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Interdecadal Change in the Northern Hemisphere Seasonal Climate Prediction:Predictability and Prediction Skill

Interdecadal Change in the Northern Hemisphere Seasonal Clim...

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第八次全国动力气象学术会议

作者： xiaojing jia June-Yi Lee Hai Lin Department of Earth Sciences ZheJiang University International Pacific Research Center and Department of Meteorology University of HawaiiHonoluluUSA Atmospheric Numerical Weather Prediction Research Environment CanadaDorvalQuebecCanada

＜正＞The interdecadal change in seasonal predictability and numerical models’ seasonal forecast skill in the Northern Hemisphere（NH） are examined using both observations and the seasonal hindcast from six coupled atmosphere-ocean climate models for the 21 years of 1960-1980（P1） and 1981-2001（P2）.It is shown that the seasonal forecast skill of the multimodel ensemble（MME） is significantly increased from P1 to P2 for all four seasons. Possible reasons accounting for the interdecadal change of the seasonal forecast skill include: （1）The numerical model’s seasonal forecast skill of the mean state,the time variability and the spatial structures of the sea surface temperature（SST） and precipitation over the tropical Pacific are much better in P2 compared to P1.（2）The examination of the potential predictability of the atmosphere,estimated by the ratio of the total variance to the variance of the model forecasts due to internal dynamics,reveals that the atmospheric potential predictability is significantly increased after 1980s which is mainly due to an increased influence of E1 Nino-Southern Oscillation（ENSO） signal over the North Pacific and North American（NPNA） regions.（3）The long-term climate trends in the atmosphere are found to contribute,to some extent,to the increased seasonal forecast skill especially over the Eurasian regions.（4）The improved ocean observations in P2 provide better initial conditions for the coupled numerical Models’ seasonal forecast.

关键词： seasonal forecast climate prediction and predictability interdecadal change potential predictability

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参数效应的仿真与反馈环及延迟三组合分析法——以场供给侧改革为例

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系统工程理论与实践 2018年第12期38卷 3140-3161页

作者：贾仁安祝琴贾晓菁卢钱红李凤刘畅南昌大学管理学院系统工程研究所南昌330031 中央财经大学北京100081 南昌大学体育与教育学院南昌330031 青岛大学商学院青岛266071

规划落实、政策执行、措施实施皆是通过参数调控系统相关发展速度实现,为此进行参数调控流率效应方法研究.调控流率效应研究必须建立参数调控的可靠性高的模型,必须进行仿真、反馈环、延迟3组合分析,才可能具体清楚回答运行中的问题,实... 详细信息

规划落实、政策执行、措施实施皆是通过参数调控系统相关发展速度实现,为此进行参数调控流率效应方法研究.调控流率效应研究必须建立参数调控的可靠性高的模型,必须进行仿真、反馈环、延迟3组合分析,才可能具体清楚回答运行中的问题,实际应用需要,查文献还未见此种三组合分析法,为此,进行“参数调控流率入树建模和仿真、反馈环、延迟三组合分析法”研究.顶天立地,通过南昌大学系统工程科研教学基地明鑫农场供给侧改革,生产雷竹笋、有机鱼、有机生猪特色农产品系统实例,阐述此“三组合分析法”.首先基于逐树设撤关联数结构行为检验法,建立场的8参数调控的8棵流率基本入树可靠性高的模型.接着,依据实际分析与场规划,分别确定8参数的调控区间,设参数的调控区间最小值组合为最不满意方案,区间最大值组合为最满意方案,对两方案进行参数调控效应仿真分析.随后,建立8阶参数枝向量行列式计算反馈环,获12条参数调控反馈环.接着,分别围绕雷竹笋产业、有机鱼产业和开发青饲料发展有机猪促进圈养猪转型3个子系统的6条反馈环分别进行反馈环结构图、反馈环正负极性、延迟阶数确定研究后,进行仿真、反馈环、延迟3结合具体分析结果,然后,依据3结合的具体分析和反馈环、延迟原理,提出了供给侧改革的操作性强的管理思路与技术.通过研究,建立了实际背景强的“参数调控入树流率建模和仿真、反馈环、延迟三组合分析”新方法.

关键词：参数调控树流率效应逐树结构行为检验建模法仿真和反馈环及延迟三组合分析农业供给侧改革系统动态学

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Season-dependent forecast skill of the dominant atmospheric circulation patterns over the North Pacific and North American region

Season-dependent forecast skill of the dominant atmospheric ...

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创新驱动发展提高气象灾害防御能力——第30届中国气象学会年会

作者： xiaojing jia Hai Lin June-Yi Lee Bin Wang Department of Earth Sciences ZheJiang University Recherche en Pr_evision Num_erique Environment Canada International Pacific Research Center and Department of Meteorology University of Hawaii

Multi-model ensemble (MME) seasonal forecasts are analyzed to evaluate numerical models' performance in predicting the leading forced atmospheric circulation pattern over the extratropical Northern Hemisphere. Results show that the time evolution of the leading tropical Pacific sea surface temperature (SST)-coupled atmospheric pattern (MCA1), which is obtained by applying a maximum covariance analysis (MCA) between 500-hPa geopotential height (Z500) in the extratropical Northern Hemisphere and SST in the tropical Pacific Ocean, can be predicted with a significant skill in MAM, JJA and DJF one-month ahead. However, most models perform poorly in capturing the time variation of MCA1 in SON with August 1 st initial condition. Two possible reasons for the models' low skill in SON are identified. Firstly, the models have the most pronounced errors in the mean state of SST and precipitation along the central equatorial Pacific. Due to the link between the divergent circulation forced by tropical heating and the midlatitude atmospheric circulation, errors in the mean state of tropical SST and precipitation may lead to a degradation of midlatitude forecast skill. Secondly, examination of the potential predictability of the atmosphere, estimated by the ratio of the total variance to the variance of the model forecasts due to internal dynamics, shows that the atmospheric potential predictability over the North Pacific-North American (NPNA) region is the lowest in SON comparing to the other three seasons. The low ratio in SON is due to a low variance associated with external forcing and a high variance related to atmospheric internal processes over this area.

关键词： seasonal forecast, numerical model, MME

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Early-life famine exposure,adulthood obesity patterns,and risk of low-energy fracture

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Frontiers of Medicine 2024年第1期18卷 192-203页

作者： Hongyan Qi Chunyan Hu Jie Zhang Lin Lin Shuangyuan Wang Hong Lin xiaojing jia Yuanyue Zhu Yi Zhang Xueyan Wu Mian Li Min Xu Yu Xu Tiange Wang Zhiyun Zhao Weiqing Wang Yufang Bi Meng Dai Yuhong Chen Jieli Lu Department of Endocrine and Metabolic Diseases Shanghai Institute of Endocrine and Metabolic DiseasesRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China Shanghai National Clinical Research Center for Endocrine and Metabolic Diseases Key Laboratory for Endocrine and Metabolic Diseases of the National Health Commission of the People’s Republic of ChinaShanghai National Center for Translational MedicineRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China

Malnutrition in early life increases the risk of osteoporosis,but the association of early-life undernutrition combined with adulthood obesity patterns with low-energy fracture remains *** study included 5323 community-dwelling subjects aged⩾40 years from ***-life famine exposure was identified based on the participants’birth *** obesity was assessed using the body mass index(BMI),and abdominal obesity was evaluated with the waist-to-hip ratio(WHR).Low-energy fracture was defined as fracture occurring after the age of⩾40 typically caused by falls from standing height or *** to the nonexposed group,the group with fetal,childhood,and adolescence famine exposure was associated with an increased risk of fracture in women with odds ratios(ORs)and 95%confidence intervals(CIs)of 3.55(1.57–8.05),3.90(1.57–9.71),and 3.53(1.05–11.88),respectively,but not in *** interactions were observed between fetal famine exposure and general obesity with fracture among women(P for interaction=0.0008).Furthermore,compared with the groups with normal BMI and WHR,the group of women who underwent fetal famine exposure and had both general and abdominal obesity had the highest risk of fracture(OR,95%CI:3.32,1.17–9.40).These results indicate that early-life famine exposure interacts with adulthood general obesity and significantly increases the risk of low-energy fracture later in life in women.

关键词： famine obesity body mass index waist-to-hip ratio low-energy fracture

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IAP AGCM模式对地面气温长期趋势的预报分析

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气候与环境研究 2011年第6期16卷 753-759页

作者：贾晓静韩启群浙江大学地球科学系杭州310027

分析了1979～2004年共26年中国台站地面气温的观测资料以及中国科学院大气物理研究所的大气环流模式IAP AGCM在夏季和冬季的季节集合预报结果对地面气温长期变化趋势的预报。分析结果表明,在所研究的26年中,中国大部分地区是一个增温的... 详细信息

分析了1979～2004年共26年中国台站地面气温的观测资料以及中国科学院大气物理研究所的大气环流模式IAP AGCM在夏季和冬季的季节集合预报结果对地面气温长期变化趋势的预报。分析结果表明,在所研究的26年中,中国大部分地区是一个增温的趋势,其中冬季增温比夏季增温显著。IAP AGCM集合预报不能很好地预报出观测资料中的地面气温长期变化趋势的幅度和空间分布。进一步的分析表明,改善数值模式对观测资料中地面气温的长期变化趋势的预报将能够提高数值模式对地面气温的预报技巧。而这种预报技巧的提高在冬季比夏季更为显著。

关键词：长期气候变化数值模式集合预报季节预报

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