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Progress in Natural Science:Materials International 2008年第2期18卷 161-165页

作者： Chan-Su Ryu center for asian monsoon and climate environment research chosun university Gwangju Republic of Korea

The zonal displacement of the western Pacific subtropical high remarkably influences the climate anomalies in China. In this paper,a new zonal index of the subtropical high is defined by modifying previous indices,and is used to investigate the relationship between the zonal displacement of the subtropical high and the dominant modes of 850-hPa circulations. It is found that the zonal displacement of the subtropical high is significantly correlated with the first two leading modes of circulations. In particular,the correlation coefficient between the index and the time series associated with the second mode is as high as 0.78 in 1958-2003 (46 years). Since the second mode is not associated with significant anomalies of sea surface temperatures,the above results imply the diffculty in seasonal forecasting of the zonal displacement of the subtropical high. In addition,the interannual variability in the zonal displacement of the subtropical high has been considerably enhanced since 1978,due to the effects of both dominant modes,especially the second mode. This is likely to account for the frequent occurrence of anomalous climate in China during the recent two decades.

关键词： Western Pacific subtropical high General circulation Dominant mode Interannual variability Interdecadal variation

Characteristics of super drought in Southwest China and the associated compounding effect of multiscalar anomalies

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Science China Earth Sciences 2024年第7期67卷 2084-2102页

作者： Lin WANG Wen CHEN Gang HAUNG Ting WANG Qiulin WANG Xiaoyun SU Zixuan REN Chakrit CHOTAMONSAK Atsamon LIMSAKUL Kritanai TORSRI CAS Key Laboratory of Regional climate-environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province Chengdu 610072China Department of Atmospheric Science Yunnan UniversityKunming 650500China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Carbon Neutrality research center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Hangzhou Meteorological Bureau Hangzhou 310051China center for monsoon System research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Geography Faculty of Social SciencesChiang Mai UniversityChiang Mai 50200Thailand environmental Science research center Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand climate Change and environmental research center TechnopolisKlong 5Klong LuangPathumthani 12120Thailand Hydro-Informatics Innovation Division Hydro-Informatics InstituteMinistry of Higher EducationScienceResearch and InnovationBangkok 10900Thailand

In recent decades,Southwest China(SWC)has suffered from frequent super droughts,leading to severe economic losses and ecological *** study investigates the characteristics of super droughts in SWC during 1961-2022,reveals the compounding effect of multiscalar anomalies,and explores the plausible atmospheric circulation mechanisms *** nature of super drought is a compound drought caused by the superposition of extreme drought events across multiple time *** contrasting the typical drought cases in 2006 and 2022,the decisive role of multiscalar drought compounding is *** on the Comprehensive Multiscalar Index(CMI),multiple super drought events in SWC were identified to be temporally clustered during *** them,the decadal background of enhanced evaporation and precipitation deficit at long time scales is a necessary condition for shaping the overall pattern of super droughts,while the precipitation and evaporation anomalies at short time scales trigger the outbreak of super droughts,determining the exact timing of *** events include August-September 2006,November 2009 to May 2010,July-October 2011,April-May 2012,January-April 2013,*** results suggest that the contribution of superposed precipitation anomalies to super drought is 2.4 times that of *** regards the circulation mechanisms affecting multiscalar precipitation,the anomalous spatial patterns at short-term and long-term scales are similar,featuring the cyclonic circulation over the South China Sea and the northeasterly wind anomalies together with the subsidence center over *** 2006-2014,the possible causes for the cross-seasonal persistent precipitation reduction in SWC are the extreme negative phase of the Pacific Decadal Oscillation(PDO)in the North Pacific as well as the pronounced warming of the warm pool in the western *** key dynamic processes are outlined as *** the one hand,the negative PDO p

关键词： Super drought Multiscalar Compounding effect Mechanism analysis Southwest China

Interdecadal Variations of ENSO Impacts over the Indo-Northwest Pacific Region and the Related Mechanisms

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Journal of Meteorological research 2024年第2期38卷 235-248页

作者： Hongxia LAN Jing MA Haiming XU Jingjia LUO Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(KLME/ILCEC)Nanjing University of Information Science&TechnologyNanjing 210044 School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing 210044

Owing to limited observations,it remains unknown whether the impact of El Niño-Southern Oscillation(ENSO)on the Indian Ocean-Northwest Pacific(IO-NWP)climate showed decadal changes in the early 20th *** multi-source reanalysis and hindcast datasets from the ECMWF and NOAA extending back to 1901,this study investigates interdecadal variations of the impact of ENSO on the IO-NWP climate from 1901 to *** is found that the influence of ENSO on the IO-NWP climate shows“strong-weak-strong”interdecadal change during *** is characterized by much weaker Indian Ocean sea surface temperature(SST)warming and a weaker NWP subtropical anticyclone(NWPSA)in the following summer of El Ni?o during 1946-1967,compared with those in the other two periods(1901-1945 and 1968-2009).Analyses of the datasets indicate that the interdecadal variation is mainly associated with the change in ENSO *** contrast to the period of 1946-1967,a greater SST variance occurred in the central-eastern equatorial Pacific during 1901-1945 and 1968-2009.A stronger El Ni?o tends to generate more significant anticyclonic anomalies over the southeast Indian Ocean through *** northwesterly anomalies to the south of the anticyclone weaken the southeast trade winds and warm the south Indian Ocean SST via wind-evaporation-SST feedback,and the positive south Indian Ocean SST anomalies trigger westward-propagating oceanic Rossby waves to induce stronger warming of the southwest Indian Ocean,leading to a significant asymmetric wind pattern across the equator in *** profound northeastward winds on the north side weaken the southwest monsoon,leading to a“second warming”over the north Indian Ocean in summer,which anchors the eastward-propagating warm Kelvin waves and results in a stronger NWPSA by inducing surface divergence and suppressing deep convection.

关键词： ENSO Indo-Northwest Pacific Northwest Pacific subtropical anticyclone decadal changes

Statistical models reveal the effects of atmospheric black carbon on glacial bacterial abundance on the Tibetan Plateau

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Journal of Earth Science 2024年

作者： Yongqin Liu Baiqing Xu Mukan Ji Zhongwei Huang Siyu Chen Jiming Li Guannan Mao Key Laboratory of Tibetan environment Changes and Land Surface Processes， Institute of Tibetan Plateau research， Chinese Academy of Sciences center for the Pan-third Pole environment， Lanzhou university university of Chinese Academy of Sciences Key Laboratory for Semi-Arid climate Change of the Ministry of Education， College of Atmospheric Sciences， Lanzhou university

Ice cores play an important role in the reconstruction of historical atmospheric information. The glacier of the Tibetan Plateau is influenced by the Indian monsoon and westerly winds， which divide the Tibetan Plateau into monsoon- and westly influenced regions. These atmospheric circulations bring distinct microbial communities to glaciers， with the microbial dispersal process being also influenced by atmospheric factors. However， the potential influence of between bacterial abundance and atmospheric factors is not well known. To reveal potential mechanisms controlling bacterial abundance between two regions， we obtained bacterial abundance and atmospheric records for the past 46 years from two ice cores located within these regions. Statistical regression models were constructed to fit the relationship between bacterial abundance and atmospheric factors. Generalized additive model (GAM) was superior in modeling bacterial abundance compared with linear models and showed that the key factors affecting bacterial abundance were different in the monsoon- and westerly-dominated regions. Specifically， atmospheric dust and black carbon were the key factors for the monsoon-dominated region， and westerly index was the key factor for the westerly-dominated region. The model outputs confirm that atmospheric black carbon plays an important role in affecting bacterial abundance for the glacier located within the monsoon-dominated region， particularly in recent decades. The model also predicted that bacterial abundance will increase by 27% with a doubled black carbon deposition. We quantify and model for the first time that relationship between bacterial abundance and atmospheric black carbon in Tibetan glaciers change over time based on GAM models.

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Variation in the surface heat flux on the north and south slopes of Mount Qomolangma

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Atmospheric and Oceanic Science Letters 2024年第5期17卷 28-33页

作者： Yonghao Jiang Maoshan Li Yuchen Liu Ting Wang Pei Xu Yaoming Ma Fanglin Sun School of Atmospheric Sciences/Plateau Atmosphere and environment Key Laboratory of Sichuan Province/Chengdu Plain Urban Meteorology and environment Observation and research Station of Sichuan Province Chengdu University of Information TechnologyChengduChina Key Laboratory of Tibetan environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesCAS Center for Excellence in Tibetan Plateau Earth SciencesBeijingChina Key Laboratory of Land Surface Process and climate Change in Cold and Arid Regions Chinese Academy of SciencesLanzhouChina

The distinctive conditions present on the north and south slopes of Mount Qomolangma,along with the intricate variations in the underlying surfaces,result in notable variations in the surface energy flux patterns of the two *** this paper,data from TESEBS(Topographical Enhanced Surface Energy Balance System),remote sensing data from eight cloud-free scenarios,and observational data from nine stations are utilized to examine the fluctuations in the surface heat flux on both *** inclusion of MCD43A3 satellite data enhances the surface albedo,contributing to more accurate simulation *** model results are validated using observational *** RMSEs of the net radiation,ground heat,sensible heat,and latent heat flux are 40.73,17.09,33.26,and 30.91 W m^(−2),*** net radiation flux is greater on the south slope and exhibits a rapid decline from summer to *** to the influence of the monsoon,on the north slope,the maximum sensible heat flux occurs in the pre-monsoon period in summer and the maximum latent heat flux occurs during the *** south slope experiences the highest latent heat flux in *** dominant flux on the north slope is sensible heat,while it is latent heat on the south *** seasonal variations in the ground heat flux are more pronounced on the south slope than on the north *** in summer,the ground heat flux on the north slope surpasses that on the south slope.

关键词： Mount Qomolangma TESEBS model Remote sensing retrieval Surface heat fluxes

Variation in the permafrost active layer over the Tibetan Plateau during 1980–2020

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Atmospheric and Oceanic Science Letters 2024年第5期17卷 34-39页

作者： Jinglong Huang Chaofan Li Binghao Jia Chujie Gao Ruichao Li College of Oceanography Hohai UniversityNanjingChina center for monsoon System research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina

The active layer,acting as an intermediary of water and heat exchange between permafrost and atmosphere,greatly influences biogeochemical cycles in permafrost areas and is notably sensitive to climate *** the Chinese Meteorological Forcing Dataset to drive the Community Land Model,version 5.0,this study simulates the spatial and temporal characteristics of active layer thickness(ALT)on the Tibetan Plateau(TP)from 1980 to *** show that the ALT,primarily observed in the central and western parts of the TP where there are insufficient station observations,exhibits significant interdecadal changes after *** average thickness on the TP decreases from 2.54 m during 1980–1999 to 2.28 m during 2000–*** change is mainly observed in the western permafrost region,displaying a sharp regional inconsistency compared to the eastern region.A persistent increasing trend of ALT is found in the eastern permafrost region,rather than an interdecadal *** aforementioned changes in ALT are closely tied to the variations in the surrounding atmospheric environment,particularly air ***,the area of the active layer on the TP displays a profound interdecadal change around 2000,arising from the permafrost thawing and *** consistently decreases before 2000 but barely changes after *** regional variation in the permafrost active layer over the TP revealed in this study indicates a complex response of the contemporary climate under global warming.

关键词： Active layer thickness Permafrost Tibetan plateau Climatological characteristics

Insights from the Second Tibetan Plateau Scientific Expedition: Unveiling the westerly–monsoon synergy and hydroclimate changes

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Atmospheric and Oceanic Science Letters 2024年第5期17卷 1-2页

作者： Chaofan Li Yaoming Ma Tianjun Zhou Riyu Lu center for monsoon System research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Land-Atmosphere Interaction and Its Climatic Effects Group State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingChina State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Hydraulic&environmental Engineering China Three Gorges UniversityYichangChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina College of Atmospheric Sciences Lanzhou UniversityLanzhouChina Qomolangma Atmospheric and environmental Observation and research Station TingriChina Kathmandu center for research and Education Chinese Academy of Sciences-Tribhuvan UniversityBeijingChina China-Pakistan Joint research center on Earth Sciences IslamabadPakistan

The Tibetan Plateau(TP),often referred to as the“asian Water Tower”,holds vast reserves of glaciers,snow,and permafrost,serving as the crucial source for major rivers that support billions of people across *** TP’s unique geographical positioning fosters significant interplay between the westerly and monsoon systems,the hydroclimate changes on the TP and its interactions with these two major atmospheric circulation systems through both the thermodynamic and dynamic processes,as well as the atmospheric water cycle of the *** interactions have far-reaching impacts on the weather and climate of China,Asia,and even the global atmospheric circulation.

关键词： Tibetan Plateau holds

Recent Enhanced Deep Troposphere-to-Stratosphere Air Mass Transport Accompanying the Weakening asian monsoon

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Journal of Meteorological research 2024年第4期38卷 708-719页

作者： Bin CHEN Jianzhong MA Wei ZHANG Jianchun BIAN Tianliang ZHAO Xiangde XU State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing100081China Department of Plants Soils and ClimateUtah State UniversityUT84322USA Key Laboratory of Middle Atmosphere and Global environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&TechnologyNanjing 210044China

The asian monsoon(AM) region is a well-known region with prevailing stratosphere–troposphere exchange(STE).However,how the STE across this region changes with the weakening AM remains ***,we particularly diagnose the air mass transport between the planetary boundary layer(PBL) and the stratosphere over the AM region during 1992–2017 using the Lagrangian particle dispersion model FLEXPART based on the ERA-Interim reanalysis *** results show that both the downward and upward deep STEs exhibit a detectable increasing trend,while the latter,namely,the deep troposphere-to-stratosphere transport(DTST),is relatively more *** analysis reveals that the long-term trend of DTST over the AM region could be partly attributed to changes in the Pacific Walker circulation and the air temperature(especially at upper levels).Additionally,it is found that DTST increases markedly over the tropical oceanic regions,while the increasing DTST into the stratosphere can be attributed to the enhanced air masses originated from the PBL over the terrestrial regions,where large amounts of pollutant emissions *** results imply that the influence of the DTST on the chemical composition and the climate of the stratosphere over the AM region is expected to become increasingly important,and is thereby of relevance to climate projection in an evolving climate.

关键词： stratosphere–troposphere exchange(STE) air mass transport deep troposphere-to-stratosphere transport(DTST) asian monsoon(AM) pollution

Variability and trends of near-surface wind speed over the Tibetan Plateau:The role played by the westerly and asian monsoon

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Advances in climate Change research 2024年第3期15卷 525-536页

作者： Gang-Feng ZHANG Cesar AZORIN-MOLINA Deliang CHEN Tim RMCVICAR Jose AGUIJARRO Kai-Qiang DENG Lorenzo MINOLA Jaeyeon LEE Seok-Woo SON Heng MA Pei-Jun SHI State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Engineering center of Desertification and Blown-Sand Control of Ministry of Education Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Key Laboratory of environmental Change and Natural Disaster of Ministry of Education Beijing Normal UniversityBeijing 100875China Centro de Investigaciones Sobre Desertificaci'on Consejo Superior de Investigaciones Cientı'ficas(CIDECSIC-UV-Generalitat alenciana)ClimateAtmosphere and Ocean Laboratory(Climatoc-Lab)Moncada 46113Spain Regional climate Group Department of Earth SciencesUniversity of GothenburgGothenburg 40530Sweden CSIRO environment CanberraACT 2600Australia Australian research Council Centre of Excellence for climate Extremes CanberraACT 2600Australia State Meteorological Agency Balearic Islands OfficePalma de Mallorca 07015Spain School of Atmospheric Sciences Sun Yat-sen UniversityZhuhai 519082China Interuniversity Department of Regional and Urban Studies and Planning(DIST) Politecnico and University of TurinTurin 10125Italy School of Earth and environmental Sciences Seoul National UniversitySeoul 08826South Korea Atmospheric and Oceanic Sciences Program Princeton UniversityPrinceton NJ 08544USA Geophysical Fluid Dynamics Laboratory NOAAPrinceton NJ 08544USA

Near-surface wind speed exerts profound impacts on many environmental issues,while the long-term(≥60 years)trend and multidecadal variability in the wind speed and its underlying causes in global high-elevation and mountainous areas(e.g.,Tibetan Plateau)remain largely ***,by examining homogenized wind speed data from 104 meteorological stations over the Tibetan Plateau for 1961-2020 and ERA5 reanalysis datasets,we investigated the variability and long-term trend in the near-surface wind speed and revealed the role played by the westerly and asian *** results show that the homogenized annual wind speed displays a decreasing trend(-0.091 m s^(−1)per decade,pasian winter monsoon in modulating near-surface wind changes over the Tibetan *** potential physical processes associated with westerly and asian monsoon changes are in concordance with wind speed change,in terms of overall weakened horizontal air flow(i.e.,geostrophic wind speed),declined vertical thermal and dynamic momentum transfer(i.e.,atmospheric stratification thermal instability and vertical wind shear),and varied Tibetan Plateau *** indicates that to varying degrees these processes may have contributed to the changes in near-surface wind speed over the Tibetan *** study has implications for wind power production and soil wind erosion prevention in the Tibetan Plateau.

关键词： Tibetan Plateau Wind speed Decadal change Atmospheric circulation Physical processes

Effects of Tropical Cyclone Activity on the Boundary Moisture Budget over the Eastern China monsoon Region

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Advances in Atmospheric Sciences 2017年第6期34卷 700-712页

作者： Xiaobin LIN Zhiping WEN Wen ZHOU Renguang WU Ruidan CHEN center for monsoon and environment research and Department of Atmospheric Sciences Sun Yat-Sen University Guy Carpenter Asia-Pacific climate Impact Centre School of Energy and EnvironmentCity University of Hong Kong center for monsoon System research Institute of Atmospheric PhysicsChinese Academy of Sciences

In summer, water vapor over the eastern China monsoon region （ECMR） comes mainly from low latitudes and is modu- lated by tropical cyclone （TC） activity in East Asia （EA）. This study examines the variability of water vapor transport over the ECMR, especially of the moisture inflow via the southern and eastern boundaries. The results of composite and correlation analyses, using data from 1979 to 2010, reveal significant differences in moisture budgets along the boundaries between TC days and non-TC days. Almost 80% of the water vapor transport via the eastern boundary occurs during TC days, while at the southern boundary most inflow occurs on non-TC days. The ratio of the total water vapor transport between TC and non-TC days is about 4：6. In addition, the E1 Nifio-Southem Oscillation （ENSO） exhibits a remarkable influence on moisture trans- port over EA and the contributions of moisture inflow on TC days increase （reduce） in E1 Nifio （La Nifia） years. Moreover, different types of TCs, based on their tracks, have different effects on the moisture budgets along the southern and eastern boundaries. When TCs enter EA （but not the ECMR）, they favor the moisture inflow via the eastern boundary and hinder the moisture inflow via the southern boundary. After TCs enter the ECMR, the inhibition of moisture inflow via the southern boundary will be weakened, and more water vapor can be brought into the ECMR. For some recurring TCs with an increase in TC activity in the midlatitudes, the influence is uncertain in different cases. The results herein suggest that TC activity is an important factor that influences the boundary moisture budgets in the ECMR.

关键词： tropical cyclone boundary moisture budget eastern China monsoon region