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Dynamical diagnosis of the breakup of the stratospheric polar vortex in the Northern Hemisphere

Science china Earth sciences 2007年第9期50卷 1369-1379页

作者： wei ke1,2, chen wen1 & huang ronghui1 1 center for monsoon system research, institute of atmospheric physics, chinese academy of sciences, beijing 100080, china 2 Graduate University of the chinese academy of sciences, beijing 100049, china center for monsoon system research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100080 China Graduate University of the chinese academy of sciences Beijing 100049 China center for monsoon system research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100080 China

The research on climate change in polar regions, especially on the role of polar in the global climate system, has gain unprecedented level of interest. It has been the key scientific issue of the International Polar Year program (IPY, 2007—2008). In this paper, we dealt with the debate upon the breakup time of the stratospheric polar vortex in boreal spring. An observational study of the relation between stratospheric polar vortex breakup and the extra-tropical circulation was performed. The mean breakup date—when the winter westerly at the core of polar jet turns to summer easterly—is about April 10. The breakup time has large interannual variation with a time span of about 2 months. It also has a long-term trend with the 1990s and 2000s witnessing more and more late breakups of polar vortex. Composite of wind speed at the core of polar jet for the extremely early and late breakup years shows that late years have two periods of westerly weakening while early breakup years have only one. The flrst weakening in the late years happens in middle January with wind speed dropping sharply from more than 40 m s^(-1) to about 15 m s^(-1). This is accompanied with anomalous activities of planetary waves in both stratosphere and troposphere; while the second weakening in the late breaking years is mainly the results of diabatic heating with very weak wave activities. In early breakup years, the transition from westerly to easterly is rapid with wind speed dropping from more than 30 m s^(-1) to less than -10 m s^(-1) within a month. This evolution is associated with a strong bidirectional dynamical coupling of the stratosphere and troposphere. The circulation anomalies at low troposphere are also analyzed in the extremely early and late breakup years. It shows that there are significant differences between the two kinds of extreme years in the geopotential height and temperature composite analysis, indicating the dynamical coupling of stratosphere and troposphere with the evo

关键词： stratospheric polar vortex, wave-flow interaction, diabatic heating, final breakup, stratosphere-troposphere coupling

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A primary study of the correlation between the net air-sea heat flux and the interannual variation of western North Pacific tropical cyclone track and intensity

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Acta Oceanologica Sinica 2011年第6期30卷 27-35页

作者： WU Liang wen Zhiping huang ronghui center for monsoon and Environment research/Department of atmospheric sciences Sun Yat-sen University Guangzhou 510275 China center for monsoon system research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

A singular value decomposition （SVD） analysis is carried out to reveal the relationship between the interannual variation of track and intensity of the western North Pacific tropical cyclones （WNPTCs） in the tropical cyclone （TC） active season （July–November） and the global net air-sea heat flux （Q net ） in the preceding season （April–June）. For this purpose, a tropical cyclone track and intensity function （TIF） is defined by a combination of accumulated cyclone energy （ACE） index and a cyclone track density function. The SVD analysis reveals that the first mode is responsible for the positive correlation between the upward heat flux in the tropical central Pacific and the increased activity of western North Pacific （WNP） TIF, the second mode for the positive correlation between the upward heat flux in the North Indian Ocean and the northeastward track shift of WNPTCs and the third mode for the negative correlation between the upward heat flux in mid-latitude central Pacific and the northwest displacement of the WNP TC-active center. This suggests that Q net anomalies in some key regions have a substantial remote impact on the WNP TC activity.

关键词： tropical cyclone western North Pacific the net air-sea heat flux (Q net ) interannual variation

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Water Budgets of Tropical Cyclones： Three Case Studies

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Advances in atmospheric sciences 2013年第2期30卷 468-484页

作者： WU wei chen Jilong huang ronghui center for monsoon system research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100190 University of chinese academy of sciences Beijing 100049

In this study, three tropical cyclones （TCs） that passed through the Taiwan Strait were analyzed; our results show that precipitation is not directly related to the intensity of TCs. From the perspective of water budget, moisture flux convergence was dominant and contributed -70% of the moisture for TC precipitation over the ocean and almost all over the land, especially inside the TC circulation. Their spatial distributions were also similar. Evaporation contributed -30% of the moisture for precipitation over the ocean but changed little with the time. Moisture flux convergence can be divided into two parts： wind convergence and moisture advection. Moisture flux convergence was mostly due to wind convergence, which was dominant in the southwestern quadrants of the TCs. Moisture advection was located in the northern area, and becomes relatively important when the TCs approached the land. The moisture flux convergence and its two parts varied during TC movement, with strengthening and contraction of moisture convergence present near landfall. The vertical structure of the three TC eases all indicated that the moisture convergence was mainly confined to the lower atmosphere under 800 hPa and a weak divergence region was present in the middle troposphere around 550 hPa.

关键词： tropical cyclones water budget moisture convergence precipitation evaporation

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Tropical cyclones in a warming climate

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Science china Earth sciences 2020年第3期63卷 456-458页

作者： Liang WU Zhiping wen ronghui huang center for monsoon system research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China Department ofatmospheric and Oceanic sciences/institute of atmospheric sciences Fudan UniversityShanghai 200438China Jiangsu Collaborative Innovation center for Climate Change Nanjing 210023China

Over the past few decades,extreme tropical cyclone(TC)events have become more *** the 2019 typhoon season in the western North Pacific(WNP),7 super typhoons hit East *** Typhoon Lekima(2019)caused economic loss of at ... 详细信息

关键词： china. typhoon warming

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Stratosphere amplifies the global climate effect of wildfires

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Science china Earth sciences 2020年第2期63卷 309-311页

作者： ke wei wen chen Luyang XU Chunjiang ZHOU center for monsoon system research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China beijing Meteorological Service Beijing100089China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China

The summer of 2019 witnessed a great number of wildfires around the *** example,wildfires scorched huge swaths of Alaska,British Columbia in Canada,and parts of *** forest fires in Siberia and the Far East of Russia were also very serious,affecting nearly 3 million hectares of land,and putting some parts of Russia into a state of *** particular,forest fires in the Amazon region had attracted global *** to Science,as of August 24,BraziPs National institute for Space research had counted more than 41000 fires this year,86%more than last year,compared with 22000 in the same period last *** in Brazil and elsewhere believe that the recent increase of wildfires is closely related to the increasing ac・tivities of deforestation(Arruda et al.,2019;Escobar,2019).

关键词： forest Canada Siberia

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Northern Hemisphere Stratospheric Polar Vortex Extremes in February under the Control of Downward Wave Flux in the Lower Stratosphere

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atmospheric and Oceanic Science Letters 2012年第3期5卷 183-188页

作者： wei ke chen wen center for monsoon system research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China

Using ECWMF ERA-40 and Interim reanalysis data, the planetary wave fluxes associated with the February extreme stratospheric polar vortex were studied. Using the three-dimensional Eliassen-Palm (EP) flux as a measure of the wave activity propagation, the authors show that the unusual warm years in the Arctic feature an anomalous weak stratosphere-troposphere coupling and weak downward wave flux at the lower stratosphere, especially over the North America and North Atlantic (NANA) region. The extremely cold years are characterized by strong stratosphere-troposphere coupling and strong downward wave flux in this region. The refractive index is used to examine the conception of planetary wave reflection, which shows a large refractive index (low reflection) for the extremely warm years and a small refractive index (high reflection) for the extremely cold years. This study reveals the importance of the downward planetary wave propagation from the stratosphere to the troposphere for explaining the unusual state of the stratospheric polar vortex in February.

关键词： stratospheric sudden warming atmospheric dynamics middle atmosphere planetary wave reflection

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Climatology and Trends of High Temperature Extremes across china in Summer

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atmospheric and Oceanic Science Letters 2009年第3期2卷 153-158页

作者： wei ke chen wen center for monsoon system research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100080 China

Based on the daily maximum air temperature data from 300 stations in china from 1958 to 2008, the climatological distribution of the number of days with high temperature extremes （HTEs, maximum temperatures higher than 35℃） are studied with a focus on the long-term trends. Although the number of HTE days display well-defined sandwich spatial structures with significant decreasing trends in central china and increasing trends in northern china and southern china, the authors show that the decrease of HTE days in central china occurs mainly in the early period before the 1980s, and a significant increase of HTE days dominates most of the stations after the 1980s. The authors also reveal that there is a jump-like acceleration in the number of HTE days at most stations across china since the mid 1990s, especially in South china, East china, North china, and northwest china.

关键词： high temperature extremes hot days long term trend climate regime

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Historical Change and Future Scenarios of Sea Level Rise in Macao and Adjacent Waters

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Advances in atmospheric sciences 2016年第4期33卷 462-475页

作者： Lin WANG Gang huang wen ZHON wen chen key Laboratory of Regional Climate-Environment for Temperature East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 State key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 Joint center for Global Change Studies Beijing 100875 Guy Carpenter Asia-Pacific Climate Impact Centre School of Energy and Environment City University of Hong Kong Hong Kong center for monsoon system research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100190

Against a background of climate change, Macao is very exposed to sea level rise （SLR） because of its low elevation, small size, and ongoing land reclamation. Therefore, we evaluate sea level changes in Macao, both historical and, especially, possible future scenarios, aiming to provide knowledge and a framework to help accommodate and protect against future SLR. Sea level in Macao is now rising at an accelerated rate： 1.35 mm yr-1 over 1925-2010 and jumping to 4.2 mm yr I over 1970-2010, which outpaces the rise in global mean sea level. In addition, vertical land movement in Macao contributes little to local sea level change. In the future, the rate of SLR in Macao will be about 20% higher than the global average, as a consequence of a greater local warming tendency and strengthened northward winds. Specifically, the sea level is projected to rise 8-12, 22-51 and 35-118 cm by 2020, 2060 and 2100, respectively, depending on the emissions scenario and climate sensitivity. Under the --8.5 W m 2 Representative Concentration Pathway （RCP8.5） scenario the increase in sea level by 2100 will reach 65 118 cm--double that under RCP2.6. Moreover, the SLR will accelerate under RCP6.0 and RCP8.5, while remaining at a moderate and steady rate under RCP4.5 and RCP2.6. The key source of uncertainty stems from the emissions scenario and climate sensitivity, among which the discrepancies in SLR are small during the first half of the 21st century but begin to diverge thereafter.

关键词： Macao sea level rise emissions scenario climate sensitivity vertical land movement uncertainty

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Towards seamless environmental prediction-development of Pan-Eurasian EXperiment(PEEX)modelling platform

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Big Earth Data 2024年第2期8卷 189-230页

作者： Alexander Mahura Alexander Baklanov Risto Makkonen Michael Boy Tuukka Petäjä Hanna KLappalainen Roman Nuterman Veli-Matti kerminen Stephen R.Arnold Markus Jochum Anatoly Shvidenko Igor Esau Mikhail Sofiev Andreas Stohl Tuula Aalto Jianhui Bai Chuchu chen Yafang cheng Oxana Drofa Mei huang Leena Järvi Harri Kokkola Rostislav Kouznetsov Tingting Li Piero Malguzzi Sarah Monks Mads Bruun Poulsen Steffen M.Noe Yuliia Palamarchuk Benjamin Foreback Petri Clusiu Till Andreas Soya Rasmussen Jun She Jens Havskov Sørensen Dominick Spracklen Hang Su Juha Tonttila Siwen Wang Jiandong Wang Tobias Wolf-Grosse Yongqiang Yu Qing Zhang wei Zhang wen Zhang Xunhua Zheng Siqi Li Yong Li Putian Zhou Markku Kulmala Faculty of Science Institute for Atmospheric and Earth System Research(INAR)/PhysicsUniversity of Helsinki(UHEL)HelsinkiFinland Science and Innovation Department World Meteorological Organization(WMO)GenevaSwitzerland Niels Bohr institute University of CopenhagenCopenhagenDenmark Climate system research Finnish Meteorological Institute(CSR-FMI)HelsinkiFinland School of Engineering sciences Lappeenranta University of TechnologyLappeenrantaFinland institute for Climate and atmospheric Science School of Earth and EnvironmentUniversity of LeedsLeedsUK Biodiversity and Natural Resources Program International Institute for Applied Systems Analysis(IIASA)LaxenburgAustria Department of physics and Technology UiT-The Arctic University of NorwayTromsoNorway Nansen Environmental and Remote Sensing center(NERSC) BergenNorway atmospheric Composition Finnish Meteorological Institute(AC-FMI)HelsinkiFinland Norwegian institute for Air research(NILU) KjellerNorway LAGEO Institute of Atmospheric PhysicsChinese Academy of Sciences(IAP-CAS)BeijingChina Max Planck institute for Chemistry(MPI-Chem) MainzGermany institute of atmospheric sciences and Climate National Research Council of Italy(CNR-15SAC)BolognaItaly institute of Geographic sciences and Natural Resources research(IGSNRR) Chinese Academy of Sciences(CAS)BeijingChina Faculty of Science Helsinki Institute of Sustainability Science(HELSUS)University of Helsinki(UHEL)HelsinkiFinland atmospheric research Centre of Eastern Finland Finnish Meteorological Institute(ARCEF-FMI)KuopioFinland institute of atmospheric physics Chinese Academy of Sciences(IAP-CAS)BeijingChina Department of Plant Physiology Estonian University of Life Sciences(EULS)Institute of Agricultural and Environmental Sciences(IAES)TartuEstonia Danish Meteorological institute(DMI) CopenhagenDenmark State key Laboratory of atmospheric Boundary Layer physics and atmospheric Chemistry LAPC) Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences(CAS)BeijingChina Uni

The Pan-Eurasian Experiment Modelling Platform(PEEX-MP)is one of the key blocks of the PEEX research *** PEEX MP has more than 30 models and is directed towards seamless envir-onmental *** main focus area is the Arctic-boreal regions and *** models used in PEEX-MP cover several main components of the Earth’s system,such as the atmosphere,hydrosphere,pedosphere and biosphere,and resolve the physicalchemicalbiological processes at different spatial and temporal scales and *** paper introduces and discusses PEEX MP multi-scale modelling concept for the Earth system,online integrated,forward/inverse,and socioeconomical modelling,and other approaches with a particular focus on applications in the PEEX geographical *** employed high-performance com-puting facilities,capabilities,and PEEX dataflow for modelling results are *** virtual research platforms(PEEXView,Virtual research Environment,Web-based Atlas)for handling PEEX modelling and observational results are *** over-all approach allows us to understand better physical-chemicalbiological processes,Earth’s system interactions and feedbacks and to provide valuable information for assessment studies on evaluating risks,impact,consequences,*** population,envir-onment and climate in the PEEX *** work was also one of the last projects of *** Zilitinkevich,who passed away on 15 February *** the finalization took time,the paper was actually submitted in 2023 and we could not argue that the final paper text was agreed with him.

关键词： Multi-scale and-processes modelling concept seamless coupling high-performance computing data infrastructure virtual research platforms

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An Abrupt Rainfall Decrease over the Asian Inland Plateau Region around 1999 and the Possible Underlying Mechanism

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Advances in atmospheric sciences 2017年第4期34卷 456-468页

作者： Jinling PIAO wen chen ke wei Yong LIU Hans-F.GRAF Joong-Bae AHN Alexander POGORELTSEV center for monsoon system research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China School of Earth Science University of the Chinese Academy of SciencesBeijing 100049China Department of atmospheric sciences Pusan National UniversityPusan 609-735Korea Russian State Hydrometeorological University St.Petersburg 195196Russia

A decadal change in summer rainfall in the Asian inland plateau（AIP） region is identified around 1999. This decadal change is characterized by an abrupt decrease in summer rainfall of about 15.7% of the climatological average amount,leading to prolonged drought in the Asian inland plateau region. Both the surface air temperature and potential evapotranspiration in the AIP show a significant increase, while the soil moisture exhibits a decrease, after the late 1990s. Furthermore,the normalized difference vegetation index shows an apparent decreasing trend during 1999–2007. Three different drought indices—the standardized precipitation index, the standardized precipitation evapotranspiration index, and the self-calibrating Palmer drought severity index—present pronounced climate anomalies during 1999–2007, indicating dramatic drought exacerbation in the region after the late 1990s. This decadal change in the summer rainfall may be attributable to a wave-like teleconnection pattern from Western Europe to Asia. A set of model sensitivity experiments suggests that the summer warming sea surface temperature in the North Atlantic could induce this teleconnection pattern over Eurasia, resulting in recent drought in the AIP region.

关键词： Asian inland plateau summer rainfall drought teleconnection pattern North Atlantic

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