检索结果-南通市图书馆

Co-influence of the start of thermal growing season and precipitation on vegetation spring green-up on the Tibetan Plateau

引用

Advances in Climate Change Research 2024年第2期15卷 327-337页

作者： Chen-Peng WANG Meng-Tian HUANG pan-mao zhai State Key Laboratory of Severe Weather and Institute of Global Change and Polar Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China

The climate in the Tibetan Plateau(TP)has undergone significant change in recent decades,mainly in thermal and water conditions,which plays a crucial role in phenological changes in vegetation spring phenology.However,how the start of the thermal growing season(SOS-T)and the start of the rainy season(SORS)as key climatic factors affect vegetation green-up remains unclear.Given that these factors characterize thermal and water conditions required for vegetation green-up,this study investigated changes in the SOS-T and SORS from 1961 to 2022,using observation-based datasets with long time series.We found that the SOS-T and SORS have advanced across the TP in 1961-2022 and have shown a spatial pattern of advancement in the east and delay in the west in 2000-2022.Further,the co-effect of temperature and precipitation change on the start of vegetation growing season(SOS-V)in 2000-2022 was observed.Averaged across TP,the SOS-V had an early onset of 1.3 d per decade during 2000-2022,corresponding to advanced SOS-T and SORS.Regionally,the SOS-V generally occurred nearly at the same time as the SOS-T in the high-altitude meadow region.A substantial delay in the SOS-V relative to the SOS-T was observed in the desert,shrub,grassland and forest regions and generally kept pace with the SORS.Furthermore,for 50%of the vegetated regions on the TP,inter-annual variation in the delay in the SOS-V relative to the SOS-T was dominated by precipitation change,which was profound in warm-climate regions.This study highlights the co-regulation of precipitation and temperature change in the SOS-V in different vegetation cover regions in the TP,offering a scientific foundation for comprehending the impact of climate change and prospects for vegetation phenology on the TP.

关键词： Tibetan Plateau Start of growing season Temperature Precipitation Climate change

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

Extraordinary hot extreme in summer 2022 over the Yangtze River basin modulated by the La Nina condition under global warming

引用

Advances in Climate Change Research 2024年第1期15卷 21-30页

作者： Zhen LIAO Yu-Feng YUAN Yang CHEN pan-mao zhai State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

A widespread and prolonged hot extreme hit the Yangtze River basin in summer 2022,with 300 sites established new temperature records and nearly 96%stations endured more than 40 hot days.From the perspective of the combination effect of the global warming and La Nina condition,potential mechanisms of the hot extreme were investigated.Such a record-breaking hot extreme was caused by an extremely strong and westward-shifted western Pacific subtropical high(WPSH).The global warming effect contributed primarily to the abnormal hot days in the Yangtze River basin,coupled with the modulation of the La Nina condition.The sea surface temperature anomaly pattern under La Nina condition favored more convection activities over the western Pacific,encouraging an enhanced and westward-extended WPSH.In addition,an observation-based attribution analysis indicates that anthropogenic warming may increase the probability of such extensively persistent hot extremeby1.8 times.

关键词： Hot extreme The Yangtze River basin Global warming Tropical Pacific forcing

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

Numerical simulation of the effects of global warming on vegetation in Asia

引用

Advances in Climate Change Research 2022年第5期13卷 688-699页

作者： Zheng-Qiu ZHANG pan-mao zhai Chinese Academy of Meteorological Sciences Beijing 100081China

The response of vegetation to global warming is closely related to human living environment,and uncertainty in understanding the response remains.This study aims to investigate the effects of CO_(2),temperature and precipitation changes under global warming on natural vegetation in Asia.The biophysical/dynamic vegetation model SSiB4/TRIFFID was employed to perform numerical experiments under different climate scenarios for Asia using the Princeton global forcing dataset(1948–2006).The results showed that precipitation and CO_(2) were the key factors for vegetation growth.The effect of temperature on natural vegetation varied among the study regions.Generally,an increase in temperature was conducive to vegetation growth in eastern Asia,but not in the arid and semi-arid areas of western Asia.In arid and semi-arid areas or in the vicinity of desert,the forcing effects of temperature,precipitation and CO_(2) were more remarkable,which led to a noticeable change in the area of bare land.In terms of the distribution of vegetation species,the above forcing had a greater impact on shrubs,C3 grasses and C4 plants,but less of an impact on broadleaf and coniferous forest.It was also found that,although there was a notable positive correlation between precipitation and vegetation leaf area index in northern high latitudes,the vegetation cover did not increase with precipitation,which was countered by the negative effect of surface cooling in summer.

关键词： Global warming Temperature Precipitation CO_(2) SSiB4/TRIFFID Model simulation Vegetation dynamics

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

Amplification of warming on the Tibetan Plateau

引用

气候变化研究进展:英文版 2023年第4期14卷 493-501页

作者： Cen ZHANG Da-He QIN pan-mao zhai State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China

The accelerated warming over the Tibetan Plateau relative to global means has attracted considerable attention from the scientific community.Nevertheless,the timescale,seasonality and dominant causes of the Tibetan warming amplification have not been discussed.The seasonality of the Tibetan amplification effect at different timescales was revealed in this study.Based on the optimal fingerprinting attribution method,an attribution study of the Tibetan warming amplification was also conducted after selecting the outperforming model simulations in the Coupled Model Intercomparison Project(CMIP6).Results showed that Tibetan warming amplification manifested in the mid-1970s.The annual amplification during 1961–2018 was 0.13°C per decade.The warming amplification in spring started later than all the other seasons,and the strongest warming amplification occurred in winter.The change in Tibetan warming amplification also displayed distinct decadal differences at time scales shorter than 30 years.The updated models perform better in simulating the surface air temperature change on the global land scale whilst underestimating the warming over the Tibetan Plateau region,which causes a weak amplification in the model simulation.Overall,the largest deviation comes from winter.The attribution result reveals that the stronger warming response to human influence on the Tibetan Plateau than the global land is the direct cause of the Tibetan warming amplification.This finding implies the important role of local climate feedback over the Tibetan Plateau.

关键词： Tibetan Plateau Warming amplification Climate change CMIP6 Detection and attribution

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

Constrained high-resolution projection of hot extremes in the BeijingeTianjineHebei region of China

引用

Advances in Climate Change Research 2023年第3期14卷 387-393页

作者： Jia-Xi YANG Bai-Quan ZHOU pan-mao zhai Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China Key Laboratory of Urban Meteorology China Meteorological AdministrationBeijing 100089China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences 100081BeijingChina

The BeijingeTianjineHebei(BTH)region is the political center and one of the largest and most dynamic economic centers in China.Relative to other regions of China,it faces greater challenges from increasing hot extremes.However,future projections of regional changes in hot extremes based on multi-model ensembles carry huge uncertainty.To improve the reliability of regional projections,we used the latest highresolution outputs from nine GCMs in CMIP6-HighResMIP and constrained the projection of hot extremes in this region.In the BTH,the historical scaling of the annual maximum temperature with the mean summer(JuneeAugust)temperatures(TXx scaling)showed a significant linear relationship with the future TXx scaling in the multi-model ensemble.By comparing the observed and simulated historical TXx scaling we identified an observational constraint that could reduce the uncertainty of TXx scaling.We believed that the simulations of EC-Earth3P,ECEarth3P-HR,MPI-ESM1-2-HR and MPI-ESM1-2-XR show advantages in simulating surface air temperature and related hot extremes in this region.Verification demonstrated that surface air temperature projection in the BTH region constrained by observational constraint is more reliable.In constrained projections,by the 2040s,the increase in summer surface air temperatures is projected to exceed 1C compared to 2010s.Also,the estimated number of days of compound(sequential hot day-night)hot extremes(HND),independent hot nights(HNi)and independent hot days(HDi)was found to increase by 0.3,0.3,and-0.03 d per year during 2015-2049,respectively.The growth in numbers of days of HND,HNi and HDi was slower after observational constraint.Furthermore,the estimated increase in surface air temperature variables after constraint also reduced.This study provides support for adaptation policy-making and as a reference for the use of observational constraint in other regions of China.

关键词： Observational constraint High-resolution projection Hot extremes BeijingeTianjineHebei region

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

Distinctive impacts of atmospheric intraseasonal oscillations on the net ecosystem exchange of the southeastern China forest between spring and summer

引用

Advances in Climate Change Research 2022年第5期13卷 700-709页

作者： Jian-Ying LI Jiang-Yu mao Jong-Seong KUG pan-mao zhai State Key Laboratory of Severe Weather(LASW)and Institute of Climate System Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Division of Environmental Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea

The southeastern China(SEC)forest is an important terrestrial biospheric carbon sink in the global carbon cycle,with its total net ecosystem exchange(NEE)accounting for about 3.2%of the global forest NEE.The prevailing atmospheric intraseasonal oscillations(ISOs)over East Asia strongly modulate climatic conditions over the SEC during spring and summer,thus leading to significant ISOs in the NEE of the SEC forest.As atmospheric ISOs show strong seasonality,this study examined the distinctive impacts of atmospheric ISOs on the NEE of the SEC forest between spring and summer.During spring,the vertical coupling of 10–30-d atmospheric ISOs in the lower and upper troposphere leads to strong 10‒30-d ISOs of solar radiation and temperature over the SEC.The 10‒30-d ISOs of solar radiation and temperature further result in the 10‒30-d ISOs of gross primary productivity(GPP)and terrestrial ecosystem respiration(TER).With the covariation in GPP and TER,the NEE of the SEC forest exhibits significant 10‒30-d ISOs.In contrast,the intraseasonal variations in climatic conditions over the SEC are associated with the 15‒60-d tropical atmospheric ISO during summer.While the induced 15‒60-d ISO of solar radiation leads to that of GPP,the induced 15‒60-d ISO of temperature is small and less effective;thus,the 15‒60-d ISO of NEE mainly originates from that of GPP.

关键词： Intraseasonal oscillation Southeastern China forest Carbon fluxes Global carbon cycle

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

Changes in thermal comfortable condition in the Qinghai‒Tibet Plateau from 1979 to 2020

引用

Advances in Climate Change Research 2022年第5期13卷 666-675页

作者： Lan-Yue ZHOU Jirgen SCHMUDE pan-mao zhai Qian WANG Department of Geography Ludwig-Maximilians-University(LMU)Munich 80331Germany State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

Qinghai‒Tibet Plateau(QTP)is one of the most sensitive regions to climate change in the world.As a result,people in the QTP are more likely to be sensitively affected by climate change than those in other regions,particularly in the poverty area.Using the Universal Thermal Climate Index(UTCI)derived from ERA5 and population data,changes in annual thermal comfort condition and population under such condition in the QTP are systematically analyzed.The results reveal that there is considerable regional heterogeneity in the distribution of UTCI and the number of comfortable days(CDs),mainly due to the complex geographic features.In most areas of the QTP,the increase in UTCI leads to an increased number of comfortable days.Spatial distribution and temporal change in the number of comfortable days are found to be principally related to altitude.In areas within altitudes of 3000–4500 m,the number of comfortable days increases by up to 6 d per decade,which is faster than that in higher elevation areas above 4500 m.Results also indicate that thermal comfortable condition has improved in areas of 2500–5000 m(medium to high altitude),particularly in spring and autumn.Further research indicates that population distribution also shows a regional clustering feature,with the majority of residents residing in cities and their vicinities,where a higher number of comfortable days were observed.Most areas with a greater number of comfortable days have experienced a more significant increase in population under thermal comfortable conditions.It implies that climate change more likely has a large influence on population in the QTP.These findings are expected to enhance tourism development and the assessment of the impact on the living environment.The findings can be helpful for optimizing of tourism development and better understanding how climate change affects population distribution.

关键词： Climate change Thermal comfortable condition Universal thermal climate index Population Qinghai‒Tibet Plateau

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

Desertification dynamics in China's drylands under climate changeAuthor links open overlay panel

引用

Advances in Climate Change Research 2023年第3期14卷 429-436页

作者： Meng-Tian HUANG pan-mao zhai State Key Laboratory of Severe Weather and Institute of Global Change and Polar Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China

Much of drylands has been hit by land degradation during the recent decades.But whether and how desertification is related to climate change is poorly understood.Here,using the Normalized Difference Vegetation Index(NDVI)time series and climatic variables,we assessed the desertification dynamics over China's drylands from 1982 to 2016 and explored the climate change impacts,with a particular focus on the influence of the 2015/2016 El Niño event.We found a fluctuant downward trend of barren land area from 1982 to the early 2010s,but followed by a sharp increase afterwards.Decrease in precipitation combined with high temperature are major contributors to the barren land expansion.During the 2015/2016 El Niño,the concurrence of severe drought and heat stress gave rise to the most serious land desertification in the record.Hyper-arid and arid drylands are the predominant contributors to the abrupt barren land area increase during 2015/2016.Our findings,therefore,highlight the climate change impacts on dryland desertification processes.Future dryland expansion and accompanying drought stress may exacerbate the risk of land degradation in these regions.

关键词： Desertification Dryland ecosystems Climate change El nino China

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

Shape optimisation of basin insulator for DC gas insulated switchgear/gas insulated transmission lines based on artificial bee colony algorithm

引用

High Voltage 2024年第2期9卷 275-286页

作者： Yi Luo Shiyi mao Ju Tang Zijun pan Cheng pan State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityWuhanChina

The surface charge accumulation on the basin insulator is a particular problem in high-voltage direct current(HVDC)gas insulated switchgears(GIS)and gas insulated trans-mission lines(GIL),which restricts the development and application of extra/ultra high-voltage(EHV/UHV)technology.The surface charge distribution and anti-flashover performance are closely related to the insulator shape.To obtain the optimal basin insulator,a shape optimisation model based on artificial bee colony algorithm was established,and the minimisation objective functions based on capacitive(initial)electric field distribution and resistive(steady-state)electric field distribution were respectively constructed.The optimisation results of the two objective functions were calculated,and the electric field and charge distribution on the surface of the insulator before and after optimisation were evaluated and compared using the simulation model.The results indicated that the optimisation based on the capacitive electric field can significantly inhibit the surface charge accumulation,and the optimised insulator can significantly reduce the surface normal electric field and make the distribution of the tangential electric field more uniform,and the maximum tangential electric field can be reduced by 10%;the optimisation based on resistive electric field can achieve similar results,but requires more computational resources.Based on the results,the‘anti-charge’basin insulator structure suitable for the DC field was given.

关键词： insulator artificial charge

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

Risk factors for recurrence of common bile duct stones after surgical treatment and effect of ursodeoxycholic acid intervention

引用

World Journal of Gastrointestinal Surgery 2024年第1期16卷 103-112页

作者： Wei-Hong Yuan Zheng Zhang Qi pan Bo-Neng mao Tao Yuan Department of Gastroenterology Yixing People’s HospitalYixing 214200Jiangsu ProvinceChina

BACKGROUND Endoscopic retrograde cholangiopancreatography(ERCP)is an accurate diagnostic method for choledocholithiasis and treatment option for stone removal.Additionally,ursodeoxycholic acid(UDCA)can dissolve cholesterol stones and prevent their development and reappearance by lowering the cholesterol concen-tration in bile.Despite these treatment options,there are still patients who experience stone recurrence.The clinical data of 100 patients with choledochal stones who were hospitalized at the Yixing People’s Hospital and underwent ERCP for successful stone extraction between June 2020 and December 2022 were retrospectively collected.According to the post-ERCP treatment plan,100 patients were classified into UDCA(n=47)and control(n=53)groups.We aimed to assess the clinical efficacy and rate of relapse in the two patient populations.We then collected information(basic demographic data,clinical characteristics,and serum biochemical indicators)and determined the factors contributing to relapse using logistic regression analysis.Our secondary goal was to determine the effects of UDCA on liver function after ERCP.Compared to the control group,the UDCA group demonstrated a higher clinical effectiveness rate of 92.45%vs 78.72%(P<0.05).No significant differences were observed in liver function indices,including total bilirubin,direct bilirubin,gamma-glutamyl transpeptidase,alanine aminotransferase,alkaline phosphatase,and aspartate aminotransferase,between the two groups before treatment.After treatment,all liver function indices were significantly reduced.Comparing the control vs UDCA groups,the UDCA group exhibited significantly lower levels of all indices(55.39±6.53 vs 77.31±8.52,32.10±4.62 vs 45.39±5.69,142.32±14.21 vs 189.63±16.87,112.52±14.25 vs 149.36±15.36,122.61±16.00 vs 171.33±22.09,96.98±10.44 vs 121.35±11.57,respectively,all P<0.05).The stone recurrence rate was lower in the UDCA group(13.21%)in contrast with the control group(44.68%).Periampullary diverticula(OR:6.00,95%CI:1.69-21.30),maximum stone diam

关键词： Endoscopic retrograde cholangiopancreatography Recurrence Ursodeoxycholic acid Common bile duct stones Clinical effective rate Risk factors

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

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：