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Causes of the Extreme Hot Midsummer in Central and South China during 2017:Role of the Western Tropical Pacific Warming

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Advances in Atmospheric Sciences 2019年第5期36卷 465-478页

作者： Ruidan CHEN Zhiping WEN Riyu LU Chunzai WANG Center for Monsoon and Environment Research/Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies/School of Atmospheric Sciences Sun Yat-sen University Jiangsu Collaborative Innovation Center for Climate Change Department of Atmospheric and Oceanic Sciences/Institute of Atmospheric Sciences Fudan University State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences University of the Chinese Academy of Sciences State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences

This study investigates why an extreme hot midsummer occurred in Central and South China(CSC) during 2017. It is shown that the western North Pacific subtropical high(WNPSH) was abnormally intensified and westward-extending,resulting in anomalous high pressure and consequent extreme heat over CSC. The abnormal WNPSH was favored by the warming of the western tropical Pacific(WTP), which was unrelated to ENSO and manifested its own individual effect.The WTP warming enhanced the convection in-situ and led to anomalous high pressure over CSC via a local meridional circulation. The influence of the WTP was confirmed by CAM4 model experiments. A comparison between the 2017 midsummer and 2010 midsummer(with a stronger WNPSH but weaker extreme heat) indicated that the influence of the WNPSH on extreme heat can be modulated by the associated precipitation in the northwestern flank.The role of the WTP was verified by regression analyses on the interannual variation of the WTP sea surface temperature anomaly(SSTA). On the other hand, the WTP has undergone prominent warming during the past few decades, resulting from decadal to long-term changes and favoring extreme warm conditions. Through a mechanism similar to the interannual variation, the decadal to long-term changes have reinforced the influence of WTP warming on the temperature over CSC,contributing to the more frequent hot midsummers recently. It is estimated that more than 50% of the temperature anomaly over CSC in the 2017 midsummer was due to the WTP warming, and 40% was related to the decadal to long-term changes of the WTP SSTA.

关键词： hot midsummer Central and South China western tropical Pacific decadal to long-term changes

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

Relationship between cross-equatorial flows over the Bay of Bengal and Australia in boreal summer:Role of tropical diabatic heating

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Atmospheric and Oceanic Science Letters 2022年第2期15卷 1-6页

作者： Xuelei Jiang Yuanyuan Guo Zhiping WEN Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghaiChina Innovation Center of Ocean and Atmosphere System Zhuhai Fudan Innovation Research InstituteZhuhaiChina Jiangsu Collaborative Innovation Center for Climate Change NanjingChina

本文通过对1979–2017年夏季925 h Pa经向风异常进行经验正交函数(EOF)分解,研究了亚澳季风区内越赤道气流的年际变化特征.结果表明,越赤道气流的第一模态表现为亚澳季风区内不同通道间的同相变化,即一致加强或减弱;第二模态表现为孟加... 详细信息

本文通过对1979–2017年夏季925 h Pa经向风异常进行经验正交函数(EOF)分解,研究了亚澳季风区内越赤道气流的年际变化特征.结果表明,越赤道气流的第一模态表现为亚澳季风区内不同通道间的同相变化,即一致加强或减弱;第二模态表现为孟加拉湾和澳大利亚越赤道气流的反相变化,其中新几内亚和孟加拉湾越赤道气流的反相变化最显著.该反相模态分别对应着赤道以南地区海洋性大陆东西两侧的海温异常,其纬向偶极型的空间分布直接导致海洋性大陆西部(东部)出现沿赤道非对称的异常热汇(热源),它可以激发跨越赤道的南风(北风)异常,从而有利于该反相模态的出现.

关键词：越赤道气流赤道非对称热源线性斜压模式

Review of Chinese atmospheric science research over the past 70 years: Climate and climate change

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Science China Earth Sciences 2019年第10期62卷 1514-1550页

作者： Jianping HUANG wen CHEN Zhiping WEN Guangjun ZHANG Zhaoxin LI Zhiyan ZUO Qingyun ZHAO College of Atmospheric Sciences Lanzhou UniversityLanzhou730000China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100190China Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai200438China Scripps Institution of Oceanography University of CaliforniaSan Diego92093USA Laboratoire de Météorologie Dynamique CNRSSorbonne UniversitéParis75005France Chinese Academy of Meteorological Sciences Beijing100081China

Climate and climate change have always been a research focus of atmospheric sciences. This paper summaries research efforts, achievements and international contributions of the Chinese scientific community on climate and climate change over the past 70 years. The review is based on papers published officially in national or international scientific journals,and is organized to cover six aspects:(1) general climate studies;(2) impact of the Qinghai-Tibetan Plateau;(3) impact of the East Asian monsoon;(4) influences of teleconnection oscillation and westerlies;(5) climate dynamics and development of climate models;and(6) climate change. It is, however, to be noted that the present review can not be considered as an exhaustive one, since there is a huge body of literature in the field.

关键词： Climate of China Qinghai-Tibetan Plateau East Asian Monsoon Climate change

Impacts of Two Types of El Ni o on the MJO during Boreal Winter

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Advances in Atmospheric Sciences 2016年第8期33卷 979-986页

作者： Bo PANG Zesheng CHEN Zhiping WEN Riyu LU Center for Monsoon and Environment Research/School of Atmospheric Sciences Sun Yat-Sen UniversityGuangzhou 510275 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301

The features of the MJO during two types of El Ni no events are investigated in this paper using the daily NCEP-2reanalysis data, OLR data from NOAA, and Real-time Multivariate MJO index for the period 1979–2012. The results indicate that the MJO exhibits distinct features during eastern Pacific（EP） El Ni no events, as compared to central Pacific（CP） El Ni no events. First, the intensity of the MJO is weakened during EP El Ni no winters from the tropical eastern Indian Ocean to the western Pacific, but enhanced during CP El Ni no winters. Second, the range of the MJO eastward propagation is different during the two types of El Ni no events. During EP El Ni no winters, the MJO propagates eastwards to 120？W, but only to 180？during CP El Ni no winters. Finally, the frequency in eight phases of the MJO may be affected by the two types of El Ni no. Phases 2 and 3 display a stronger MJO frequency during EP El Ni no winters, but phases 4 and 5 during CP El Ni no winters.

关键词： MJO eastern Pacific El Nio central Pacific El Nio

Recent Progress in Studies of the Variabilities and Mechanisms of the East Asian Monsoon in a Changing Climate

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Advances in Atmospheric Sciences 2019年第9期36卷 887-901页

作者： wen CHEN Lin WANG Juan FENG Zhiping WEN Tiaojiao MA Xiuqun YANG Chenghai WANG Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai 200438China School of Atmospheric Sciences Nanjing UniversityNanjing 210023China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China

Located in a monsoon domain,East Asia suffers devastating natural hazards induced by anomalous monsoon behaviors.East Asian monsoon(EAM)research has traditionally been a high priority for the Chinese climate community and is particularly challenging in a changing climate where the global mean temperature has been rising.Recent advances in studies of the variabilities and mechanisms of the EAM are reviewed in this paper,focusing on the interannual to interdecadal time scales.Some new results have been achieved in understanding the behaviors of the EAM,such as the evolution of the East Asian summer monsoon(EASM),including both its onset and withdrawal over the South China Sea,the changes in the northern boundary activity of the EASM,or the transitional climate zone in East Asia,and the cycle of the EASM and the East Asian winter monsoon and their linkages.In addition,understanding of the mechanism of the EAM variability has improved in several aspects,including the impacts of different types of ENSO on the EAM,the impacts from the Indian Ocean and Atlantic Ocean,and the roles of mid-to high-latitude processes.Finally,some scientific issues regarding our understanding of the EAM are proposed for future investigation.

关键词： East Asian summer monsoon East Asian winter monsoon changing climate monsoon onset and withdrawal transitional climate zone different types of ENSO

Leachate treatment using a demonstration aged refuse biofilter

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Journal of Environmental Sciences 2010年第7期22卷 1116-1122页

作者： Hongjiang Li Yingying Gu Youcai Zhao Zhiping WEN State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Shenzhen Environment Engineering Technology Center Shenzhen 518001 China Department of Civil Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Approximately 7000 m^3 of aged refuse （AR） with a placement of over eight years was excavated from Shanghai Refuse Landfill, the largest landfill in China, and used for the construction of a two-stage bioreactor （AR biofilter） media for the biological treatment of 100 m3 of refuse landfill leachate. It was found that over 64% of COD, 96.9%-99.8% of NH4^＋-N, and 95.8%-99.8% of BOD5 could be removed by the AR biofilter, when the leachate with initial COD, BOD5, and NH4^＋-N concentrations were 986-4128 mg/L, 264--959 mg/L,m and 538-1583 mg/L, respectively. The corresponding concentrations in the effluent were reduced to below 30（000 mg/L, 2-12 mg/L, and 10-20 mg/L, respectively. The effluent was clear and pale yellow with suspended solid below 150 mg/L and color below 150 Pt/Co degree. Meanwhile, the total nitrogen removal was only 49%-63%, indicating a relative poor denitrification capacity of AR biofilter. The effluent pH was neutral and the population of Escherichia coli was less than 10^-1 CFU/mL. Hence, it was considered that the demonstration project can work well for the effective treatment of leachate.

关键词： aged refuse landfill leachate treatment COD ammonia

Influences of tropical circulation and sea surface temperature anomalies on extreme heat over Northeast Asia in the midsummer of 2018

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Atmospheric and Oceanic Science Letters 2019年第4期12卷 238-245页

作者： CHEN Ruidan wen zhiping LU Riyu Center for Monsoon and Environment Research/Guangdong Province Key Labor atory for Climate Change and Natural Disaster Studies/School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhouChina Department of Atmospheric and Oceanic Sciences/Institute of Atmospheric Sciences Fudan UniversityChina 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 the Chinese Academy of SciencesBeijingChinaeJiangsu Collaborative Innovation Center for Climate ChangeNanjingChina

2018年盛夏东北亚地区遭受了严重的高温热浪袭击。同时,西北太平洋地区出现了研究时段内最强的气旋环流异常,热带海温的异常信号在热带太平洋和北印度洋均很弱,而热带东南印度洋呈现明显的冷异常。针对2018年盛夏的独特现象,本文研究了... 详细信息

2018年盛夏东北亚地区遭受了严重的高温热浪袭击。同时,西北太平洋地区出现了研究时段内最强的气旋环流异常,热带海温的异常信号在热带太平洋和北印度洋均很弱,而热带东南印度洋呈现明显的冷异常。针对2018年盛夏的独特现象,本文研究了热带东南印度洋和热带大气环流对东北亚高温的影响。结果表明,热带东南印度洋冷海温激发异常的越赤道气流和局地经圈环流,有利于西北太平洋出现气旋异常。进一步,西北太平洋气旋异常通过局地经圈环流在东北亚地区造成异常下沉和反气旋,从而有利于东北亚高温发生。

关键词：高温东北亚热带大气环流热带东南印度洋

Vertical structure of variabilities in the tropical easterly jet and associated factors

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大气和海洋科学快报:英文版 2023年第5期16卷 81-87页

作者： Ye Yao Yuanyuan Guo Zhiping WEN Sihua Huang Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghaiChina CMA-FDU Joint Laboratory of Marine Meteorology ShanghaiChina Shanghai Key Laboratory of Ocean-land-atmosphere Boundary Dynamics and Climate Change Fudan UniversityShanghaiChina Jiangsu Collaborative Innovation Center for Climate Change NanjingChina

热带东风急流为热带上对流层-下平流层内夏季出现的一支强东风带,其垂直范围为300-70hPa,目前其垂直结构的变化特征有待研究.本文利用经验正交函数分解研究了热带东风急流纬向垂直剖面的主要模态。第一模态表现为垂直方向上急流强度的... 详细信息

热带东风急流为热带上对流层-下平流层内夏季出现的一支强东风带,其垂直范围为300-70hPa,目前其垂直结构的变化特征有待研究.本文利用经验正交函数分解研究了热带东风急流纬向垂直剖面的主要模态。第一模态表现为垂直方向上急流强度的一致变化.ENSO对第一模态的年际分量具有主导贡献,而大西洋年代际振荡和太平洋年代际振荡可能调制其年代际分量第二模态表现为热带东风急流垂直位移的年际变化.热带平流层准两年振荡不同位相的相继下传既可以直接影响对流层顶的纬向风异常,也可以通过改变海洋性大陆附近的对流异常影响热带东风急流的垂直位置.

关键词：热带东风急流垂直结构年际变化年代际变化厄尔尼诺-南方涛动平流层准两年振荡