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Increasing Surface UV Radiation in the Tropics and Northern Mid-Latitudes due to Ozone Depletion after 2010

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Advances in Atmospheric Sciences 2023年第10期40卷 1833-1843页

作者： Fei XIE Yan XIA Wuhu FENG yingli niu School of Systems Science and College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China National Centre for Atmospheric Science University of LeedsLeeds LS29PHUK Istitute for Climate and Atmospheric Science School of Earth and EnvironmentUniversity of LeedsLeeds LS29JTUK

Excessive exposure to ultraviolet(UV)radiation harms humans and *** level of surface UV radiation had increased due to declines in stratospheric ozone in the late 1970s in response to emissions of *** the implementation of the Montreal Protocol,the stratospheric loading of chlorine/bromine peaked in the late 1990s and then decreased;subsequently,stratospheric ozone and surface UV radiation would be expected to recover and decrease,***,we show,based on multiple data sources,that the May–September surface UV radiation in the tropics and Northern Hemisphere mid-latitudes has undergone a statistically significant increasing trend[about 60.0 J m^(–2)(10 yr)^(–1)]at the 2σlevel for the period 2010–20,due to the onset of total column ozone(TCO)depletion[about−3.5 DU(10 yr)^(–1)].Further analysis shows that the declines in stratospheric ozone after 2010 could be related to an increase in stratospheric nitrogen oxides due to increasing emissions of the source gas nitrous oxide(N_(2)O).

关键词： surface UV radiation stratospheric ozone stratospheric chemistry N_(2)O

Density matrix method and ultrafast processes

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Science China Chemistry 2012年第4期55卷 579-593页

作者： niu yingli LIN ChihKai ZHU ChaoYuan MINEO Hirobumi CHAO ShengDer FUJIMURA Yuichi HAYASHI Michitoshi LIN ShengHsien Key Laboratory of Organic Solids Beijing National Laboratory for Molecular Science(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China Institute of Modern Physics Northwest UniversityXi’an 710069China Department ofChemistry Faculty ofScienceTohoku UniversitySendai 980Japan

When femtosecond （fs） timeresolved experiments are used to study ultrafast processes, quantum beat phenomena are often observed. In this paper, to analyze the fs timeresolved spectra, we will present the density matrix method, a powerful theoretical technique, which describes the dynamics of population and coherence of the system. How to employ it to study the pumpprobe experiments and fs ultrafast processes is described. The transition of pyrazine is used as an example to demonstrate the application of the density matrix method. Recently, Suzuki＇s group have employed the 22 fs time resolution laser to study the dynamics of the state of pyrazine. In this case, conical intersection is commonly believed to play an important role in this nonadiabatic process. How to treat the effect of conical intersection on nonadiabatic processes and fs timeresolved spectra is presented. Another important ultrafast process, vibrational relaxation, which takes place in subps and ps range and has never been carefully studied, is treated in this paper. The vibrational relaxation in water dimer is chosen to demonstrate the calculation. It should be noted that the vibrational relaxation of （H20）2 has not been experimentally studied but it can be accomplished by the pump-probe experiments.

关键词： density matrix master equation conical intersection vibrational relaxation

Cherish the Memory of Chinese People’ s Old Friend K.S. Silin

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Voice of Friendship 2008年第1期 41-46页

作者： niu yingli

Silin and the Wuhan Yangtze River Bridge On October 15, 1957, in the three towns of Wuhan, millions of people rejoiced at the completion and opening to traffic of the Wuhan Yangtze River Bridge-the first bridge over the Yangtze River. Amid the deafening noise of firecrackers, sound of gongs and drums and people’s cheers, the first train sped across the railway deck

关键词： Yangtze Wuhan completion railway millions traffic

World's First Woman Astronaut V.V. Tereshkova and Her Party Visit China

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Voice of Friendship 2004年第5期 7-10页

作者： niu yingli

At the invitation of the CPAFFC, a delegation of the Russian Centre of International Scientific and Cultural Cooperation (RCISCC) led by its president V.V. Tereshkova paid a visit to Beijing and Shanghai from May 19 t... 详细信息

关键词： invitation delegation founding Russian Woman visit

NPC Standing Committee Vice Chairman Ismail Amat Heads CPAFFC Delegation to Russia and Poland

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Voice of Friendship 2005年第1期 5-6页

作者： niu yingli

A CPAFFC delegation led by Ismail Amat,vice chairman of the Standing Committee of the National People’s Con-gress paid a goodwill visit to Russia and Poland from October11to20at the invita-tion of the Russian Centre ... 详细信息

关键词： Russia Standing Chairman delegation chairman diplo

CPAFFC Delegation Visits Ukraine

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Voice of Friendship 2004年第6期 24-26页

作者： niu yingli

A3-member delegation led by Su Guang, vice president of the CPAFFC and the China-Ukraine Friendship Association (CUFA), paid a goodwill working visit to Kiev, capital of Ukraine, and Yalta from June 20 to 27.

关键词： delegation visit president minister welcome behalf

Delegation Sent by CPAFFC and CSTA Attends 2004 Chinese and Russian Young Scientists Forum

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Voice of Friendship 2004年第6期 36-38页

作者： niu yingli

At the invitation of the Russian Centre for International Scientific and Cultural Cooperation (RCISCC), the CPAFFC and the China Science and Technology Asso-

关键词： invitation Russian CSTA delegation visited Federal

Mayor of Vilnius and His Party Visit China

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Voice of Friendship 2004年第6期 11-13页

作者： niu yingli

Invited by the CPAFFC, Mayor Arturas Zuokas of Vilnius, capital of Lithuania, led a delegation and visited Beijing, Guangzhou, Shenzhen and Shanghai from July 30 to August *** was the first time for the mayor and

关键词： visited delegation Guangzhou founding figure feeli

Kirghiz Women's Goodwill Delegation Visits China

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Voice of Friendship 2004年第3期 39-40页

作者： niu yingli

Invited by the CPAFFC, the Kirghiz women’s goodwill delegation headed by K. Abdybalieva visited Beijing, Shanghai and *** President Chen Haosu and Vice President Su Guang met with the delegation and hosted a banquet ... 详细信息

关键词： delegation headed visited Ambassador invitation Su