The Unprecedented Extreme Anticyclonic Anomaly over Northeast Asia in July 2021 and Its Climatic Impacts

This study investigates the evolution of an extreme anomalous anticyclone(AA)event over Northeast Asia,which was one of the dominant circulation systems responsible for the catastrophic extreme precipitation event in July 2021 in Henan,and further explores the significant impact of this AA on surface temperatures beneath it.The results indicate that this AA event over Northeast Asia was unprecedented in terms of intensity and duration.The AA was very persistent and extremely strong for 10 consecutive days from 13 to 22 July 2021.This long-lived and unprecedented AA led to the persistence of warmer surface temperatures beyond the temporal span of the pronounced 500-hPa anticyclonic signature as the surface air temperatures over land in Northeast Asia remained extremely warm through 29 July 2021.Moreover,the sea surface temperatures in the Sea of Japan/East Sea were extremely high for 30 consecutive days from 13 July to 11 August 2021,persisting well after the weakening or departure of this AA.These results emphasize the extreme nature of this AA over Northeast Asia in July 2021 and its role in multiple extreme climate events,even over remote regions.Furthermore,possible reasons for this long-lasting AA are explored,and it is suggested to be a byproduct of a teleconnection pattern over extratropical Eurasia during the first half of its life cycle,and of the Pacific-Japan teleconnection pattern during the latter half.

Effective Nucleic Acid Contamination Disinfection in Laboratory Settings using Ozone Gas

The Nucleic Acid Laboratory,a division of the Clinical Laboratory Department,is responsible for performing real-time PCR(qPCR)assays to rapidly detect infectious diseases,genetic disorders,and more[1].As the gold standard,qPCR has played an indispensable role in diagnosing pandemic infections,such as the coronavirus disease 2019(COVID-19)[2].

Impact of Interannual Variation of Synoptic Disturbances on the Tracks and Landfalls of Tropical Cyclones over theWestern North Pacific

This study investigates the tropical cyclone(TC)activity associated with the two leading modes of interannual variability in synoptic disturbances.Both leading modes are found to be related to a dipole pattern of TC occurrence between the subtropical western North Pacific and the South China Sea.Therefore,in this study we performed composite analyses on TC tracks and landfalls,based on the cases of combined modes,to highlight the differences.The composite results indicate that these cases are characterized by distinct features of TC tracks and landfalls:more TCs tend to take recurving tracks and attack eastern China,Korea and Japan,or more TCs exhibit straight-moving tracks and hit the Philippines,Vietnam and southern China.Further analyses suggest that these distinctions in the TC prevailing tracks and landfalls can be attributed to the differences in large-scale steering flow and TC genesis location.

Interannual Variations in Synoptic-Scale Disturbances over the Western North Pacific

The present study investigates the interannual variation of June-November synoptic disturbance activity over the western North Pacific（WNP） and its relationship with large-scale circulation for the period 1958-2014. Two leading modes of eddy kinetic energy for the disturbance variability over the WNP are obtained by EOF analysis, characterized by anomalous eddy kinetic energy over the subtropical WNP and around the Philippines, respectively. These modes explain a large portion of the interannual variance of synoptic disturbance activity over the WNP. Both are associated with lower-level cyclonic anomalies, but with different locations： over the subtropical WNP for the first mode and over the South China Sea for the second mode. Considering the impact of ENSO on synoptic disturbance activity over the WNP, we repeat the analyses after removing the effect of ENSO, which is simply defined as the components linearly regressed onto the Ni o3.4 index, and find similar results, suggesting that the leading modes and their relationships with large-scale circulation exist without SST effects.Further analyses suggest that the meridional shear of zonal winds caused by cyclonic anomalies is crucial for maintaining the leading modes through barotropic conversion.

三焦点人工晶状体术后早期临床观察

目的:比较三焦点人工晶状体(IOL)与单焦点IOL植入术后早期的视力情况、视觉质量及患者满意度。方法:前瞻性临床研究。选取2016年4-7月就诊于中国医科大学附属第四医院眼科确诊为白内障欲行手术治疗的患者44例(50眼),植入三焦点IOL为实验组(22例,25眼),植入单焦点IOL为对照组(22例,25眼)。随访至术后3个月,测试单眼裸眼远中近视力(LogMAR)、离焦曲线、主观散射光、客观散射指数(OSI)、调制传递函数截止频率(MTFcutoff)、斯特列尔比(SR)、像差,并发放调查问卷统计患者满意度、脱镜率以及光晕发生率。采用配对t检验、Wilcoxon符号秩检验及χ2检验进行数据分析。结果:术后3个月,2组间远视力差异无统计学意义,中、近视力方面,实验组(0.12±0.11、0.17±0.11)优于对照组(0.28±0.08、0.47±0.16)(t=-5.912、-8.504,均P<0.001);实验组(2.02±0.93)的OSI高于对照组(1.13±0.31)(t=-3.311,P=0.001);2组间MTFcutoff、SR、主观散射光以及像差的差异均无统计学意义;实验组在满意度和脱镜率方面优于对照组(χ2=4.50,P=0.034;χ2=30.65,P<0.001),光晕发生率在2组间差异无统计学意义。结论:三焦点IOL植入术后,患者拥有良好的远、中、近全程视力及视觉质量。