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The 2022 Extreme Heatwave in Shanghai,Lower Reaches of the Yangtze River Valley:Combined Influences of Multiscale Variabilities

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Advances in Atmospheric Sciences 2024年第4期41卷 593-607页

作者： Ping LIANG Zhiqi ZHANG yihui ding Zeng-Zhen HU Qi CHEN Key Laboratory of Cities’Mitigation and Adaptation to Climate Change in Shanghai Shanghai Regional Climate CenterChina Meteorological AdministrationShanghai 200030China National Climate Center China Meteorological AdministrationBeijing 100081China Climate Prediction Center NCEP/NWS/NOAACollege ParkMD 20740USA

In the summer of 2022,China(especially the Yangtze River Valley,YRV)suffered its strongest heatwave(HW)event since *** this study,we examined the influences of multiscale variabilities on the 2022 extreme HW in the lower reaches of the YRV,focusing on the city of *** found that about 1/3 of the 2022 HW days in Shanghai can be attributed to the long-term warming trend of global *** mid-summer of 2022,an enhanced western Pacific subtropical high(WPSH)and anomalous double blockings over the Ural Mountains and Sea of Okhotsk,respectively,were associated with the persistently anomalous high pressure over the YRV,leading to the extreme *** Pacific Decadal Oscillation played a major role in the anomalous blocking pattern associated with the HW at the decadal time ***,the positive phase of the Atlantic Multidecadal Oscillation may have contributed to regulating the formation of the double-blocking *** warming of both the warm pool of the western Pacific and tropical North Atlantic at the interannual time scale may also have favored the persistency of the double blocking and the anomalously strong *** the subseasonal time scale,the anomalously frequent phases 2-5 of the canonical northward propagating variability of boreal summer intraseasonal oscillation associated with the anomalous propagation of a weak Madden-Julian Oscillation suppressed the convection over the YRV and also contributed to the ***,the 2022 extreme HW originated from multiscale forcing including both the climate warming trend and air-sea interaction at multiple time scales.

关键词： extreme heatwave multiscale variability air-sea interaction warming trend Yangtze River Valley Shanghai

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Analysis of long-term variations of fog and haze in China in recent 50 years and their relations with atmospheric humidity

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Science China Earth Sciences 2014年第1期57卷 36-46页

作者： ding yihui LIU YanJu National Climate Center China Meteorological Administration

Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years （from 196l to 2011） shows that the number of fog days has experienced two-stage variations, with an increasing trend before 1980 and a decreasing trend after 1990. Especially, an obvious decreasing trend after 1990 can be clearly seen, which is consistent with the decreas- ing trend of the surface relative humidity. However, the number of haze days has demonstrated an increasing trend. As such, the role of reduction of atmospheric relative humidity in the transition process from fog into haze has been further investigated. It is estimated that the mean relative humidity of haze days is about 69%, lower than previously estimated, which implies that it is more difficult for the haze particles to transform into fog drops. This is possibly one of the major environmental factors leading to the reduction of number of fog days. The threshold of the relative humidity for transition from fog into haze is about 82%, also lower than previously estimated. Thus, the reduction of the surface relative humidity in China mainly due to the in- crease of the surface temperature and the saturation specific humidity may exert an obvious impact on the environmental con- ditions for the formations of fog and haze. In addition, our investigation of the relationship between haze and visibility reveals that with the increase of haze days, the visibility has declined markedly. Since 1961, the mean visibility has dropped from 4-10 to 2-4 kin, about a half of the previous horizontal distance of visibility.

关键词： fog and haze visibility relative humidity transition from fog into haze

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高电压电力系统的规划设计方案分析

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集成电路应用 2024年第7期41卷 284-285页

作者：丁逸辉苏州三新供电服务有限公司常熟分公司梅李供电所江苏215500

阐述高压电力系统规划设计的特点,探讨高压电力系统规划设计方案,包括加强用电负荷评估、电源规划、输电系统空间布局以及线路规划设计、电力负荷预测和分析、并网规划设计、应急规划。

关键词：高压电力系统规划设计负荷评估

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Observational responses of stratospheric sudden warming to blocking highs and its feedbacks on the troposphere

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Chinese Science Bulletin 2013年第8期58卷 1374-1384页

作者： LU ChunHui ding yihui National Climate Center China Meteorological Administration

The influences of tropospheric blocking high on the stratospheric sudden warming (SSW) and the SSW-induced feedback on the lower atmosphere are analyzed with NCEP (National Center for Environmental Prediction) 2 reanalysis data. Daily mean data from 1979 to 2010 are used to perform statistical and dynamical analyses. According to different distribution features of polar vortex, which can be ascribed to different activities of blocking highs, we have obtained two warming patterns in vortex splitting and displacement patterns. For vortex splitting events, in the Eurasian-North American (ENA) paratype, with disturbances of Atlantic and Aleutian blocking highs, polar vortex is split into two parts that locate at Eurasian and North American continents respectively, while in the Atlantic-East Asian (AEA) paratype, two low-pressure centers derived from the split vortex are situated in the Atlantic and East Asian regions, and two blocking systems occurring in the Urals and North American areas precede these splitting processes. For vortex displacement events, in the Aleutian-Intrusion (AI) paratype, the polar vortex is displaced to the west European and Atlantic areas by the intrusive Aleutian high and this pattern always corresponds to the blocking events occurring in the Pacific basin only. Similarly, the vortex is pushed to the west Eurasian continent by the intrusive North American high-pressure system in the North American-Intrusion (NAI) paratype, which is closely related to the blocking over these areas. The second subject of the research is that whether the anomalous stratospheric signals can be propagated to the lower atmosphere, which is depended on the intensity, duration and position of the disturbed vortex. According to our case studies, geopotential height anomalies can be propagated to the troposphere in strong SSW years, taking about 10-15 d for the decrease from 10 to 500 hPa, leading to apparent variations in the geopotential height and temperature fields.

关键词：大气对流层阻塞高压平流层变暖反馈北美大陆分裂过程观测

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The decline of global atmospheric oxygen over 1990–2005 calls for attention

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Science Bulletin 2018年第18期63卷 1175-1176页

作者： yihui ding National Climate Center China Meteorological Administration Beijing 100081 China

The rapid increase of the atmospheric carbon dioxide (CO_2) and its great impact on global climate since the industrial revolution has drawn much attention of the science community [1], while the change of oxygen (O_2) has been concerned only in the recent decades and mainly in oceanic regions [2]. It has been observed that oxygen concentration has decreased in the open ocean thermocline in many ocean regions since 1960s.

关键词：二氧化碳全球大气衰落工业革命全球气候 CO2 海洋

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Changes in Atmospheric Circulation during the Winter Regional Extreme Cold Events over China since 1960

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Journal of Meteorological Research 2023年第5期37卷 589-603页

作者： Dongxue FU yihui ding School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing 210044 Chinese Academy of Meteorological Sciences China Meteorological AdministrationBeijing 100081 Jilin Climate Center Changchun 130062 National Climate Centre China Meteorological AdministrationBeijing 100081

The number of days with occurrence of winter regional extreme cold events(RECEs) in China was found more during 1960/1961–1985/1986(period 1), less during 1986/1987–2005/2006(period 2), but more again during2006/2007–2017/2018(period 3). So far, the differences in the atmospheric circulation favoring RECEs among these three periods are unclear. In this paper, changes in atmospheric circulation during the RECEs over China are examined by using composite analysis based on the station observed temperature data and NCEP–NCAR reanalysis data in winters of 1960/1961–2017/2018. The results show:(1) the stratospheric polar vortex was more active and tended to split before the outbreak of RECEs in period 3 than that in other two periods. The shift of the stratospheric polar vortex to Eurasia helped the upper Arctic cold air to affect the lower latitudes.(2) The troposphere was characterized by a typical or significant three-wave pattern before the outbreak of RECEs in period 2, in contrast to a weakened three-wave pattern in period 1. Compared to periods 1 and 2, the Okhotsk blocking high was stronger in period 3, contributing to the inverted omega-shaped circulation pattern in East Asia–North Pacific section and a shift of global pattern from three-wave to two-wave. The weakened three-wave or two-wave circulation pattern was manifested by the stronger Ural/Okhotsk blocking high, conducive to the strengthening of the meridional circulation and the occurrence of RECEs in East Asia.(3) The Siberian high was the strongest in period 3, followed by period 1, and it was the weakest in period 2. Before the outbreak of RECEs, the Siberian high in period 3 began to intensify one week earlier than that in periods 1 and 2. Thus, the accumulation time of cold air mass in period 3 was the longest. In summary, the synergism of atmospheric circulation at high and low levels in periods 1 and 3 was more conducive to more and strong RECEs than that in period 2. Moreover, the split of the stra

关键词： regional extreme cold events interdecadal variation polar vortex blocking high East Asian trough

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The Long-term Variation of Extreme Heavy Precipitation and Its Link to Urbanization Effects in Shanghai during 1916–2014

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Advances in Atmospheric Sciences 2017年第3期34卷 321-334页

作者： Ping LIANG yihui ding Shanghai Climate Center Shanghai 200030China National Climate Center Beijing 100081China

Using the hourly precipitation records of meteorological stations in Shanghai, covering a period of almost a century （1916-2014）, the long-term variation of extreme heavy precipitation in Shanghai on multiple spatial and temporal scales is analyzed, and the effects of urbanization on hourly rainstorms studied. Results show that：（1） Over the last century, extreme hourly precipitation events enhanced significantly. During the recent urbanization period from 1981 to 2014, the frequency of heavy precipitation increased significantly, with a distinct localized and abrupt characteristic. （2） The spatial distribution of long-term trends for the occurrence frequency and total precipitation intensity of hourly heavy precipitation in Shanghai shows a distinct urban rain-island feature; namely, heavy precipitation was increasingly focused in urban and suburban areas. Attribution analysis shows that urbanization in Shanghai contributed greatly to the increase in both frequency and intensity of heavy rainfall events in the city, thus leading to an increasing total precipitation amount of heavy rainfall events. In addition, the diurnal variation of rainfall intensity also shows distinctive urban-rural differences, especially during late afternoon and early nighttime in the city area. （3） Regional warming, with subsequent enhancement of water vapor content, convergence of moisture flux and atmospheric instability, provided favorable physical backgrounds for the formation of extreme precipitation. This accounts for the consistent increase in hourly heavy precipitation over the whole Shanghai area during recent times.

关键词： hourly precipitation long-term trend urbanization extreme events

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Sustainable Management and Action in China under the Increasing Risks of Global Climate Change

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Engineering 2018年第3期4卷 301-305页

作者： yihui ding National Climate Center China Meteorological Administration Beijing 100081 China

1. Introduction In the past 100 years, earth＇s changing climate has resulted in widespread and significant impacts, with the strongest and most comprehensive evidence of climate change being seen in natural systems. Some impacts on human systems have also been observed, including impacts on water resources and hydrological systems, species shifting and migration, and negative impacts on crop yields. The most noticeable impacts are believed to result from extreme climate-related events such as those that have recently occurred, including heat waves, droughts, floods, tropical cyclones, and wildfires.

关键词： Sustainable Management Global Climate

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Impact of the Return Flow on Heavy Pollution in Winter over the Beijing–Tianjin–Hebei Region

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Journal of Meteorological Research 2023年第3期37卷 370-386页

作者： Mei MEI yihui ding Zunya WANG Chinese Academy of Meteorological Sciences China Meteorological Administration(CMA)Beijing 100081 University of Chinese Academy of Sciences Beijing 100049 Laboratory for Climate Studies/CMA–NJU Joint Laboratory for Climate Prediction Studies National Climate CentreChina Meteorological AdministrationBeijing 100081 National Climate Centre China Meteorological AdministrationBeijing 100081

In North China,the return flow(RF)refers to the airflow at the rear of an inshore high pressure,bringing southerly wind to the Beijing–Tianjin–Hebei(BTH)region when the high pressure pushes deeper from coast into the *** studies have pointed out the significant contribution of southerly anomalies to the transport and accumulation of pollutants in the BTH ***,the relationship between RF and heavy pollution episodes(HPEs)in the BTH region requires more in-depth analysis,and this study will focus on this *** objectively identifying RFs and HPEs based on the ERA5 reanalysis data and observed hourly PM_(2.5)concentration data during 9 winters of 2012–2020,it is found that almost two-thirds of the HPEs in the BTH region coincide with the occurrence of *** northward transport of warm and humid air is stronger in the HPEs under RF conditions,whereas the sinking motion and the decrease in boundary layer height dominate the HPEs without any *** then classify the RFs into north and south types by a demarcation line of 32°*** types of RFs are featured with a zonal circulation pattern,stable atmosphere,and southerly airflow favoring the development of HPEs,but the south type RFs bring warmer and wetter air masses to the BTH region,forming a more stable and thicker inversion layer and causing more severe *** occurrences of the RF,low-level winds are observed to accelerate,and the ageostrophic wind components contribute mainly to this *** the presence of RFs,the kinetic energy generation at the high level decreases,and the weakened downward transport results in weak low-level northerly winds,weak turbulence,and a shallow boundary layer,thus hindering the diffusion of atmospheric pollutants in the BTH region.

关键词： the Beijing-Tianjin-Hebei region return flow heavy pollution episode PM2.5

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An Overview of China's Mainland Temperature Change Research

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Journal of Meteorological Research 2017年第1期31卷 3-16页

作者： Guoyu REN yihui ding Guoli TANG Laboratory for Climate Studies National Climate Center China Meteorological Administration Department of Atmospheric Science School of Environmental Studies China University of Geosciences National Meteorological Information Center China Meteorological Administration

There has been significant effort devoted to investigating long-term trends in land surface air temperature over China's Mainland by Chinese scientists over the past 50 years, and much progress has been made in understanding dy- namics of the changes. This review highlights research conducted by early Chinese climatologists, and particularly Professor Shaowu Wang from Peking University, with special focus on systematic work that has been conducted since the mid to late 1970s. We also discuss major issues that remain unresolved in past and current studies. The most recent analyses indicate that the country-average annual mean surface air temperature rose by 1.12℃ over the past 115 years （1901-2015）, with a rate of increase of about 0.10℃ decade1. Temperatures have risen more rapidly since the 1950s, with the rate of increase of more than 0.25℃ decade-1. However, the recent increase in temperatures is in large part due to contamination by systematically biased data. These data are influenced by unprecedented urbaniza- tion in China, with a contribution of urbanization to the overall increase of annual mean temperatures in China's Mainland of about one third over the past half a century. If the bias is corrected, the rate of increase for the country-ave- rage annual mean surface air temperature is 0.17℃ decade-1 over the last 50-60 years, which is approximately the same as global and Northern Hemispheric averages in recent decades. Future efforts should be focused towards the recovery and digitization of early-year observational records, the homogenization of observational data, the evalu- ation and adjustment of urbanization bias in temperature data series from urban stations, the analysis of extreme tem- peratures over longer periods including the first half of the 20th century, and the investigation of the observed sur- face air temperature change mechanisms in China's Mainland.

关键词： observational data surface air temperature China's Mainland modem time climate change urbanizationeffect climate warming

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