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Tropical Cyclones over the Western North Pacific Strengthen the East Asia–Pacific Pattern during Summer

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Advances in atmospheric sciences 2022年第2期39卷 249-259页

作者： Sining LING riyu lu State Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical F{2.id Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China

The contribution of tropical cyclones(TCs)to the East Asia–Pacific(EAP)teleconnection pattern during summer was investigated using the best track data of the Joint Typhoon Warning Center and NCEP-2.reanalysis datasets from 1979 *** results showed that the TCs over the western North Pacific(WNP)correspond to a strengthened EAP pattern:During the summers of strong convection over the tropical WNP,TC days correspond to a stronger cyclonic circulation anomaly over the WNP in the lower troposphere,an enhanced seesaw pattern of negative and positive geopotential height anomalies over the subtropical WNP and midlatitude East Asia in the middle troposphere,and a more northward shift of the East Asian westerly jet in the upper *** analyses indicated that two types of TCs with distinctly different tracks,i.e.,westward-moving TCs and northward-moving TCs,both favor the EAP *** present results imply that TCs over the WNP,as extreme weather,can contribute significantly to summer-mean climate anomalies over the WNP and East Asia.

关键词： tropical cyclone East Asia–Pacific pattern teleconnection western North Pacific summer

A Decadal Shift of Summer Surface Air Temperature over Northeast Asia around the Mid-1990s

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Advances in atmospheric sciences 2014年第4期31卷 735-742页

作者： CHEN Wei lu riyu State Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical F{2.id Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Division of Earth Environmental System Pusan National University

This study identifies a decadal shift of summer surface air temperature （SAT） over Northeast Asia,including southeastern parts of Russia,Mongolia and northern china,around the *** results suggest that the SAT over the Northeast Asia experienced a significant warming after 1994 relative to that before *** decadal shift also extends to northern china,and leads to a warmer summer over Northeast china and North china after the *** decadal warming over Northeast Asia is found to concur with the enhancement of South china rainfall around the *** the one hand,both the Northeast Asian SAT and South china rainfall exhibit this mid-1990s decadal shift only in summer,but not in other *** the other hand,both the Northeast Asian SAT and South china rainfall exhibit this mid-1990s decadal shift not only in the summer seasonal mean,but also in each month of summer （June,July and August）.Furthermore,the decadal warming is found to result from an anticyclonic anomaly over Northeast Asia,which can be interpreted as the response to the increased precipitation over South china,according to previous numerical ***,we conclude that the warming shift of summer Northeast Asian SAT around the mid-1990s was a remote response to the increased precipitation over South china.

关键词： surface air temperature Northeast Asia decadal shift mid-1990s South china rainfall

Interannual variation of North china rainfall in rainy season and SSTs in the equatorial eastern Pacific

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chinese Science Bulletin 2005年第18期50卷 2069-2073页

作者： lu riyu LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The rainfall in North china during rainy sea-son (July and August (JA)) exhibits a strong interannual variability. In this study, the atmospheric circulation and SST anomalies associated with the interannual variation of JA North china rainfall are examined. It is found that on the interannual timescale, the JA North china rainfall is associ-ated with significant SST anomalies in the equatorial eastern Pacific, and the North china rainfall and SST anomaly in the equatorial eastern Pacific correspond to the similar variation of the upper-level westerly jet stream over East Asia. A pos-sible mechanism is proposed for the influence of the SST anomalies in the equatorial eastern Pacific on the North china rainfall.

关键词：中国北方地区雨水季节降雨量大气循环

Prediction of the Western North Pacific Subtropical High in Summer without Strong ENSO Forcing

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Journal of Meteorological Research 2021年第1期35卷 101-112页

作者： Chaofan LI riyu lu Nick DUNSTONE Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical F{2.id Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China Met Office Hadley Centre Exeter EX13PBUK

The western North Pacific subtropical high(WNPSH) is one of the deterministic predictors of the East Asian summer climate, and a better prediction of the WNPSH favors more reasonable forecast of the East Asian summer climate. This study focuses on seasonal prediction of the WNPSH during neutral summers without strong El Ni?o–Southern Oscillation(ENSO) forcing, and explores the associated predictable sources, using the one-month lead time retrospective forecasts from the Ensembles-Based Predictions of Climate Changes and Their Impacts(ENSEMBLES) project during 1960–2.05. The results indicate that the ENSEMBLES atmosphere–ocean–land coupled models exhibit considerable prediction skill for the WNPSH during neutral summers, with successful reproduction of the WNPSH in the majority of neutral summers. The anomalous WNPSH in neutral summers, which corresponds to cyclonic/anticyclonic anomalies in the lower troposphere, is highly correlated with an east–west dipole local sea surface temperature(SST) distribution over the tropical WNP, suggesting an intimate local air–sea coupling. Further diagnosis of the local SST–rainfall relationship and surface heat flux indicates that the anomalous local SST plays an active role in modulating the variation of the WNPSH during neutral summers, rather than passively responding to the atmospheric change. The local SST anomalies and relevant air–sea coupling over the tropical WNP are reasonably well reproduced in the model predictions, and could act as primary predictable sources of the WNPSH in neutral summers. This could aid in forecasting of the East Asian rainband and associated disaster mitigation planning.

关键词： western North Pacific subtropical high seasonal forecast neutral year air–sea interaction

Contrasts between the Interannual Variations of Extreme Rainfall over Western and Eastern Sichuan in Mid-summer

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Advances in atmospheric sciences 2022年第6期39卷 999-1011页

作者： Mengyu DENG riyu lu Chaofan LI State Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical F{2.id Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary sciences University of the Chinese Academy of SciencesBeijing 100049China institute of Plateau Meteorology China Meteorological Administration(CMA)Chengdu 610072China Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province Chengdu 610072China

Rainfall amount in mid-summer(July and August)is much greater over eastern than western Sichuan,which are characterized by basin and plateau,*** is shown that the interannual variations of extreme rainfall over these two regions are roughly independent,and they correspond to distinct anomalies of both large-scale circulation and sea surface temperature(SST).The enhanced extreme rainfall over western Sichuan is associated with a southward shift of the Asian westerly jet,while the enhanced extreme rainfall over eastern Sichuan is associated with an anticyclonic anomaly in the upper troposphere over *** low levels,on the other hand,the enhanced extreme rainfall over western Sichuan is related to two components of wind anomalies,namely southwesterly over southwestern Sichuan and northeasterly over northeastern Sichuan,which favor more rainfall under the effects of the *** speaking,the enhanced extreme rainfall over eastern Sichuan corresponds to the low-level southerly anomalies to the east of Sichuan,which curve into northeasterly anomalies over the basin when they encounter the mountains to the north of the ***,it can be concluded that the topography in and around Sichuan plays a crucial role in inducing extreme rainfall both over western and eastern ***,the enhanced extreme rainfall in western and eastern Sichuan is related to warmer SSTs in the Maritime Continent and cooler SSTs in the equatorial central Pacific,respectively.

关键词： extreme rainfall Sichuan interannual variation topography large-scale circulation

Subseasonal Change in the Seesaw Pattern of Precipitation between the Yangtze River Basin and the TropicalWestern North Pacific during Summer

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Advances in atmospheric sciences 2018年第10期35卷 1231-1242页

作者： Xinyu LI riyu lu State Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical F{2.id Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of the chinese academy of sciences Beijing 100049China

There is a well-known seesaw pattern of precipitation between the tropical western North Pacific(WNP) and the Yangtze River basin(YRB) during summer. This study identified that this out-of-phase relationship experiences a subseasonal change;that is, the relationship is strong during early summer but much weaker during mid-summer. We investigated the large-scale circulation anomalies responsible for the YRB rainfall anomalies on the subseasonal timescale. It was found that the YRB rainfall is mainly affected by the tropical circulation anomalies during early summer, i.e., the anticyclonic or cyclonic anomaly over the subtropical WNP associated with the precipitation anomalies over the tropical WNP. During mid-summer, the YRB rainfall is mainly affected by the extratropical circulation anomalies in both the lower and upper troposphere. In the lower troposphere, the northeasterly anomaly north of the YRB favors heavier rainfall over the YRB by intensifying the meridional gradient of the equivalent potential temperature over the YRB. In the upper troposphere, the meridional displacement of the Asian westerly jet and the zonally oriented teleconnection pattern along the jet also affect the YRB rainfall. The subseasonal change in the WNP–YRB precipitation relationship illustrated by this study has important implications for the subseasonalto-seasonal forecasting of the YRB rainfall.

关键词： Yangtze River basin tropical western North Pacific precipitation subseasonal change

The corrosion characteristic and mechanism of Mg-5Y-1.5Nd-xZn-0.5Zr(x=0,2.4,6 wt.%)alloys in marine atmospheric environment

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Journal of Magnesium and Alloys 2024年第1期12卷 139-158页

作者： Quantong Jiang Dongzhu lu Liren Cheng Nazhen Liu Baorong Hou CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesNo.7 Nanhai RoadQingdao 266071PR China State Key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625 Renmin StreetChangchun 130022PR China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)No.1 Wenhai RoadQingdao 266071PR China Sanya institute of Oceanology South China Sea Institute of OceanologyChinese Academy of SciencesZhenzhou RoadSanya 572000PR China

The microstructure and precipitated phases of as-cast Mg-5Y-1.5Nd-x Zn-0.5Zr(x=0,2.4,6 wt.%)alloys were investigated by optical microscopy,scanning electron microscopy,energy-dispersive spectrometry and X-ray *** exposure corrosion experiment of these magnesium alloys was tested in South china Sea and KEXUE vessel atmospheric *** corrosion characteristic and mechanism of magnesium alloys of Mg-5Y-1.5Nd-x Zn-0.5Zr(x=0,2.4,6 wt.%)alloys were analyzed by weight loss rate,corrosion depth,corrosion products and corrosion *** electrochemical corrosion tests were also measured in the natural *** comprehensive results showed that Mg-5Y-1.5Nd-4Zn-0.5Zr magnesium alloy existed the best corrosion resistance whether in the marine atmospheric environment and natural seawater *** depended on the microstructure,type and distribution of precipitated phases in Mg-5Y-1.5Nd-4Zn-0.5Zr magnesium *** quantity anodic precipitated phases in the microstructure of Mg-5Y-1.5Nd-4Zn-0.5Zr alloy played the key role in the corrosion resistance.

关键词： Marine atmospheric environment Exposure corrosion Magnesium alloy Corrosion rate Corrosion mechanism

Upper-and Lower-tropospheric Circulation Anomalies Associated with Interannual Variation of Pakistan Rainfall during Summer

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Advances in atmospheric sciences 2020年第11期37卷 1179-1190页

作者： riyu lu Saadia HINA Xiaowei HONG LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Meteorological Disaster(KLME) Ministry of Education&Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjing 210044China Department of Environmental sciences and Engineering Government College UniversityFaisalabad 38000Pakistan Climate Change Research Center(CCRC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary sciences University of the Chinese Academy of SciencesBeijing 100049China

This study investigated the large-scale circulation anomalies,in both the upper and lower troposphere,associated with the interannual variation of rainfall in Pakistan during summer,using the station observation data in this country and circulation data of the NCEP−NCAR reanalysis from 1981 to *** showed that the upper-and lower-tropospheric circulation anomalies associated with monthly rainfall variability exhibit similar features from June to August,so analyses were performed on June−August circulation and Pakistan rainfall *** analyzed results indicated that summer rainfall in Pakistan is enhanced when there is an anticyclonic anomaly to the northwest of Pakistan in the upper troposphere and easterly anomalies along the southern foothills of the Himalayas in the lower troposphere,and vice *** upper-and lower-tropospheric circulation anomalies were found to be related,but show unique *** upper-tropospheric anticyclonic anomaly is closely related to the Silk Road Pattern along the Asian westerly jet,while the lower-tropospheric easterly anomalies are related to the cyclonic anomaly to the south of Pakistan,i.e.,intensified South Asian monsoon *** results presented here suggest that the interannual variability of summer rainfall in Pakistan is a combined result of upper-and lower-tropospheric circulation anomalies,and of extratropical and tropical circulation anomalies.

关键词： rainfall Pakistan interannual variability Silk Road Pattern monsoon trough

Predictability of the East Asian Winter Monsoon Indices by the Coupled Models of ENSEMBLES

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Advances in atmospheric sciences 2014年第6期31卷 1279-1292页

作者： Se-Hwan YANG lu riyu State Key Laboratory of Numerical Modelling for atmospheric sciences and Geophysical F{2.id Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences University of chinese academy of sciences

The seasonal predictability of various East Asian winter monsoon （EAWM） indices was investigated in this study based on the retrospective forecasts of the five state-of-the-art coupled models from ENSEMBLES for a 46-year period of *** was found that the ENSEMBLES models predict five out of the 2. EAWM indices well,with temporal correlation coefficients ranging from 0.54 to *** five indices are defined by the averaged lower-tropospheric winds over the low latitudes （south of 30°N）.Further analyses indicated that the predictability of these five indices originates from their intimate relationship with ENSO.A cross-validated prediction,which took the preceding （November） observed Nifo3.4 index as a predictor,gives a prediction skill almost identical to that shown by the *** the other hand,the models present rather low predictability for the other indices and for surface air temperature in East *** addition,the models fail to reproduce the relationship between the indices of different categories,implying that they cannot capture the tropicalextratropical interaction related to EAWM ***,these results suggest that reliable prediction of the EAWM indices and East Asian air temperature remains a challenge.

关键词： East Asian winter monsoon dynamical index predictability ENSO ENSEMBLES