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Attribution of Persistent Precipitation in the Yangtze–Huaihe River Basin during February 2019

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Advances in Atmospheric Sciences 2020年第12期37卷 1389-1404页

作者： Zhixuan WANG jilin sun Jiancheng WU Fangyue NING Weiqi CHEN College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Key laboratory of Physical Oceanography Ocean University of ChinaQingdao 266100China Zhangzhou Meteorological Observatory Zhangzhou Meteorological BureauZhangzhou 363000China Huaan Meteorological Observatory Huaan Meteorological BureauZhangzhou 363800China

In February 2019,a month-long persistent precipitation event occurred in the Yangtze–Huaihe River basin.The geopotential height field that affected the duration of this frontal rainfall was divided into a high-latitude part and a lowlatitude part for analysis.In the high-latitude part,a two-wave structure led to quasi-stationary circulation,and the change of both the blocking high pressure and Arctic Oscillation phase caused cold air to invade South China continuously and changed the frontal position.In mid-to-low latitudes,the persistent precipitation showed quasi-biweekly oscillation characteristics.The so-called“subtropical high–precipitation–anticyclone”(SHPA)feedback mechanism blocked the circulation systems in the mid-to-low latitudes and provided a continuous supply of water vapor for precipitation.As for the effect of sea surface temperature,the western North Pacific anomalous anticyclone stimulated by El Niño strengthened the intensity of the southerly wind and provided support for the redevelopment of the anticyclone system in the SHPA feedback mechanism.The sea surface temperature anomaly in the South China Sea provided sensible heating for precipitation,and convergent rising airflow was conducive to the occurrence of precipitation.Additionally,the SHPA mechanism provides a reliable basis for the prediction of persistent precipitation in winter in the mid-to-low latitudes.

关键词： persistent precipitation feedback mechanism latent heat

Changes of auditory evoked magnetic fields in patients after acute cerebral infarction using magnetoencephalography

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Neural Regeneration Research 2012年第24期7卷 1906-1913页

作者： Zhanyong sun Chunfeng Song jilin sun Ling Li Yanhong Dong Jianhua Wang Jie Wu Wenzhu Cui Yujin Wu Peiyuan Lv Department of Neurology Hebei Medical UniversityShijiazhuang 050017Hebei ProvinceChina Institute of Basic Medicine Hebei Medical UniversityShijiazhuang 050017Hebei ProvinceChina Department of Magnetoencephalography Hebei General HospitalShijiazhuang 050051Hebei ProvinceChina Department of Neurology Hebei General HospitalShijiazhuang 050051Hebei ProvinceChina

Auditory evoked magnetic fields were recorded from 15 patients with acute cerebral infarction and 11 healthy volunteers using magnetoencephalography.The auditory stimuli of 2 kHz pure tone were binaurally presented with an interstimulus interval of 1 second.The intensity of stimuli was 90 dB and the stimulus duration was 8 ms.The results showed that the M100 was the prominent response, peaking approximately 100 ms after stimulus onset in all subjects.It originated from the area close to Heschl’s gyrus.In the patient group,the peak latency of M100 responses was significantly prolonged,and the mean strength of equivalent current dipole was significantly smaller in the affected hemisphere.The three-dimensional inter-hemispheric difference of the M100 positions was increased in the patient group.Our experimental findings suggested that impairment of cerebral function in patients with acute ischemic stroke can be detected using magnetoencephalography with the higher spatial resolution and temporal resolution.Magnetoencephalography could provide objective and sensitive indices to estimate auditory cortex function in patients with acute cerebral infarction.

关键词： acute cerebral infarction cerebral ischemia magnetoencephalography auditory evoked magnetic fields equivalent current dipole Heschl’s gyrus brain functional impairment nerve injury regeneration neural regeneration

The Effect of Boreal Summer Intraseasonal Oscillation on Mixed Layer and Upper Ocean Temperature over the South China Sea

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Journal of Ocean University of China 2023年第2期22卷 285-296页

作者： JIA Wentao sun jilin ZHANG Weimin WANG Huizan College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

Intraseasonal oscillation of the mixed layer and upper ocean temperature has been found to occur over the South China Sea(SCS)in the summer monsoon season based on the multiple reanalysis and observational data in this study.The method of composite analysis and an upper ocean temperature equation assisted the analysis of physical mechanisms.The results show that the mixed layer depth(MLD)in the SCS has a significant oscillation with a 30-60 d period over the SCS region,which is closely related to boreal summer intraseasonal oscillation(BSISO)activities.The MLD can increase(decrease)during the positive(negative)phase of the BSISO and usually lags behind by approximately one-eighth of the lifecycle(5 days)of the BSISO-related convection.The BSISO may cause periodic anomalies at the air-sea boundary,such as wind stress and heat flux,so it can play a dominant role in modulating the variation in MLD.There also are significant intraseasonal seawater temperature anomalies in both the surface and subsurface layers of the SCS.In addition,during the initial phase of the BSISO,the temperature anomaly signals of the thermocline are obviously opposite to the sea surface temperature(SST),especially in the southern SCS.According to the results from the analysis of the temperature equation,the vertical entrainment term caused by BSISO-related wind stress is stronger than the thermal forcing during the initial stage of convection,and it is more significant in the southern SCS.

关键词： boreal summer intraseasonal oscillation South China Sea mixed layer depth upper ocean temperature

Possible Influence of Arctic Oscillation on Winter Visibility over Eastern China

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Journal of Geoscience and Environment Protection 2017年第8期5卷 56-62页

作者： Yu Gu Xiaomeng Shi jilin sun Physical Oceanography Laboratory Ocean-Atmosphere Interaction and Climate Laboratory Ocean University of China Qingdao China Qingdao Engineering Technology Research Center for Meteorological Disaster Prevention Qingdao Meteorological Bureau Qingdao China

NCEP/NCAR reanalysis data, the Arctic Oscillation (AO) index and the atmospheric visibility (Vis) data at 134 sites in eastern China (ECN) are used to investigate the possible influence of AO on the wintertime weather and Vis over ECN. A higher relative humidity (RH, compared with the normal year) is identified over ECN in the winters with a positive phase of AO, and the wind anomaly is generally inshore in the coast areas of China. All these processes are consistent with Vis degradation over ECN. On the contrary, in the winters with a negative phase of AO, a lower RH can be identified over ECN, and the wind anomaly is generally offshore, which is favorable for Vis improvement.

关键词： The Arctic Oscillation Eastern China Winter Atmospheric Visibility

Impact of the Barents Sea SST in Autumn on the Winter Climate in Northeast China

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Journal of Geoscience and Environment Protection 2017年第7期5卷 89-95页

作者： Xiaomeng Shi Yu Gu jilin sun Jingshu Dong Min Geng Qingdao Engineering Technology Research Center for Meteorological Disaster Prevention Qingdao Meteorological Bureau Qingdao China Physical Oceanography Laboratory Ocean-Atmosphere Interaction and Climate Laboratory Ocean University of China Qingdao China CMA Public Meteorological Service Center Beijing China

We studied effects of sea surface temperature anomaly (SSTA) in the Barents Sea in autumn on the atmospheric circulation in northeast China in winter, using the NCEP reanalysis data and sea surface temperature (SST) data of the Hadley Center. The results show that the ocean thermal conditions in the Barents Sea in autumn can be used as an important reference factor for predicting the cold air activity in China. When the sea surface temperature anomaly of the Barents Sea elevated in the autumn, the sea-level pressure anomaly elevated in eastern China on December, northeast China and southeastern Russia on January and February. In the years when the SSTA of the Barents Sea elevated in the autumn, the abnormal high-pressure ridge developed over Europe, and the geopotential height in western China appeared negative anomaly at 500 hPa. At 1000 hPa, the Mongolia high-pressure increased and the northerly airflow strengthened the cold high-latitude air broke out to the south, which was easy to affect northeast and north of China. In negative SSTA years, the high-pressure ridge was west to the north Atlantic, and the geopotential height in central and northern Siberia appeared negative anomaly at 500 hPa;the Mongolia high-pressure was weakened at 1000 hPa.

关键词： Autumn the Barents Sea SSTA Atmospheric Circulation

Role of the Subtropical Westerly Jet Waveguide in a Southern China Heavy Rainstorm in December 2013

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Advances in Atmospheric Sciences 2015年第5期32卷 601-612页

作者： LI Chun sun jilin Physical Oceanography Laboratory Qingdao Collaborative Innovation Center of Marine Science and TechnologyKey Laboratory of Ocean–Atmosphere Interaction and Climate in Universities of ShangdongOcean University of China Key Laboratory of Meteorological Disaster Nanjing University of Information Science and TechnologyMinistry of Education

An extreme rainstorm hit southern China during 13–17 December 2013, with a record-breaking daily rainfall rate, large spatial extent, and unusually long persistence. We examined what induced this heavy rainfall process, based on observed rainfall data and NCEP–NCAR reanalysis data through composite and diagnostic methods. The results showed that a Rossby waveguide within the subtropical westerly jet caused the event. The Rossby wave originated from strong cold air intrusion into the subtropical westerly jet over the eastern Mediterranean. With the enhancement and northward shift of the Middle East westerly jet, the Rossby wave propagated slowly eastward and deepened the India–Burma trough, which transported a large amount of moisture from the Bay of Bengal and South China Sea to southern China. Strong divergence in the upper troposphere, caused by the enhancement of the East Asian westerly jet, also favored the heavy rainfall process over Southeast China. In addition, the Rossby wave was associated with a negative-to-positive phase shift and enhancement of the North Atlantic Oscillation, but convergence in the eastern Mediterranean played the key role in the eastward propagation of the Rossby wave within the subtropical westerly jet.

关键词： subtropical westerly jet waveguide,southern China rainstorm,Rossby wave,India–Burma trough,North At-lantic Oscillation

Spatial Distribution and Seasonal Variation of Explosive Cyclones over the North Atlantic

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Journal of Ocean University of China 2018年第5期17卷 1000-1010页

作者： sun Yawen FU Gang sun jilin ZHANG Shuqin College of Oceanic and Atmospheric Sciences Ocean University of China Key Laboratory of Physical Oceanography Ocean University of China

Spatial distribution and seasonal variation of explosive cyclones(ECs) over the North Atlantic from October 2000 to September 2016 are investigated using the reanalysis data of Final Analysis(FNL),Mean Sea Level Pressure(MSLP) and Optimum Interpolation(OI) Sea Surface Temperature(SST) provided by the National Centers for Environmental Prediction(NCEP),the European Centre for Medium-Range Weather Forecasts(ECMWF) and the National Oceanic and Atmospheric Administration(NOAA),respectively.Considering the meridional distribution of ECs and 10-m height wind field associated with the ECs,the definition of EC given by Yoshida and Asuma(2004) is modified.It is found that the ECs occurred mainly in four regions during winter season,namely,North America continent(NAC),the Northwest Atlantic(NWA),the North-central Atlantic(NCA),and the Northeast Atlantic(NEA),depending on the spatial distribution of EC's maximum deepening rate of central sea level pressure(SLP).According to the magnitude of maximum deepening rate,the trend of EC numbers basically decrease with the increase of EC's maximum deepening rate over the North Atlantic during the whole time period.Over the North Atlantic basin,for monthly statistics,the NEA,NCA,and NWA cyclones occur mainly in December,from December to March,and from January to February,respectively.NWA,NCA and NEA cyclones in winter are associated with low-level baroclinicity,both low-level baroclinicity and upper-level forcing and upper-level forcing,respectively.According to monthly variation,the averaged maximum deepening rate of central SLP firstly increases and then decreases from July to June.Overall,the distribution of ECs' tracks is basically in the southwest-northeast direction.During winter circulation stage(from October to May),the averaged maximum deepening rate of central SLP and the averaged minimum central SLP of ECs decrease,and the averaged explosive-deepening duration of ECs shortens from west to east over the North Atlantic basin.During summer circulation stage(from June to Septe

关键词：北大西洋气旋北方分发爆炸季节空间 ECMWF

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“白话”“口语”与现代诗的叙述学

思想战线 2022年第3期48卷 162-172页

作者：孙基林山东大学诗学高等研究中心山东青岛266237

中国新诗发端于新文化运动中的“白话诗”,而“白话”作为新诗赖以存在的语体,它是在当时人们日常口语的基础上,经过传统白话语言和欧化语体等多重作用而形成的一种语言形式。尽管白话诗中的“白话”不等于口语,但它与口语的关系最为密... 详细信息

中国新诗发端于新文化运动中的“白话诗”,而“白话”作为新诗赖以存在的语体,它是在当时人们日常口语的基础上,经过传统白话语言和欧化语体等多重作用而形成的一种语言形式。尽管白话诗中的“白话”不等于口语,但它与口语的关系最为密切。“白话”本质上就是一种叙述语言,所以,白话诗具有赖以存在的叙述基因和要素。虽然白话、口语一直是百年新诗史上最为重要的焦点话题之一,并且以不同面目反复出现,但真正能与新文化运动中的白话诗相提并论的,也只有20世纪80年代出现的口语写作思潮。无论“前口语”还是“后口语”,实质上都是一种叙述语体,并且以此前后呼应、影响,从而形成了大面积的诗歌叙述风气和思潮。如从历史过程看,无论是新文化运动中的白话叙述诗,还是新时期启蒙年代的口语叙述性写作,均为中国现代诗的叙述学提供了典型文本和叙述思想。

关键词：白话口语现代诗叙述学

异常对流经度差异对El Niño影响区域气候的分析

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大气科学 2023年第2期47卷 453-469页

作者：陈君杰孙即霖中国海洋大学海洋与大气学院青岛266100

利用1979~2019年NOAA(美国国家海洋和大气局)月平均OLR资料,1960~2019年NCEP/NCAR(美国气象环境预报中心和美国国家大气研究中心)和ECMWF(欧洲中期天气预报中心)ERA5月平均再分析资料,以及英国东安格利亚(East Anglia)大学CRU地表气温... 详细信息

利用1979~2019年NOAA(美国国家海洋和大气局)月平均OLR资料,1960~2019年NCEP/NCAR(美国气象环境预报中心和美国国家大气研究中心)和ECMWF(欧洲中期天气预报中心)ERA5月平均再分析资料,以及英国东安格利亚(East Anglia)大学CRU地表气温观测资料,采用合成分析方法,探讨了热带太平洋异常对流纬向位置不同的El Niño事件对区域气候的影响。结果表明:基于热带太平洋异常对流活动纬向位置,研究El Niño事件对大气环流和区域气候异常的影响,可避免SST异常反映大气对流活动异常存在局限性的缺陷。超强El Niño事件中,热带太平洋异常对流位置偏东,位于140°W附近。热带东西太平洋异常下沉区偏东,导致澳大利亚东北部和巴西东北部从9月到次年2月严重高温干旱,而秘鲁和厄瓜多尔沿岸降水偏多。9~11月PNA(太平洋—北美)遥相关波列位置偏东,北美大槽显著减弱,使冬季北美大陆气温明显偏高。格陵兰岛到欧洲西北部位势高度偏低,亚欧北部显著偏暖。一般东部型El Niño事件中,异常对流位于赤道160°W附近。热带东西太平洋异常下沉区较超强事件偏西,导致澳大利亚西北部和南美西北部从9月到次年5月持续干旱,澳大利亚东部降水正常偏多。PNA波列较超强事件偏西,北美大槽加深,秋冬季北美东部出现严寒。而El Niño Modoki事件中,异常对流位于180°附近,秘鲁和厄瓜多尔沿岸处于对流抑制区,降水偏少,受异常反气旋持续控制,澳大利亚大部分地区从9月到次年5月持续干旱。PNA波列更加偏西,冬季北美东南部偏冷。一般东部型事件和El Niño Modoki事件冬季,大西洋表现为NAO(北大西洋涛动)负位相,亚欧中纬度地区气温偏低。

关键词：热带异常对流经度差异区域气候异常遥相关波列