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effect of vertical overturning circulation scale and moist static energy tendency on MJO phase speed

Atmospheric and Oceanic Science Letters 2022年第1期15卷 68-75页

作者： Feng Hu tim Li School of Geographic Information and Tourism Chuzhou UniversityChuzhouChina Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjingChina International Pacific Research Center and Department of Atmospheric Sciences School of Ocean and Earth Science and TechnologyUniversity of Hawaii at ManoaHonoluluHawaiiUSA

The combined effects of vertical overturning circulation(VOC) zonal length scale and moist static energy(MSe)tendency zonal asymmetry on MJO phase speed were investigated based on diagnosis of eRA-Interim data over a 40-year period(1979-2019).In a key region(80°-100°e),128 MJO events were *** was found that the larger the VOC zonal length scale,the faster the MJO eastward *** correlation coefficient between them was 0.52,exceeding the 99% confidence level.A significant positive correlation(0.59) was also identified between the phase speed and MSe tendency zonal asymmetry.A linear regression model based on the aforementioned two parameters was constructed,and the phase speed could be estimated based on the *** correlation coefficient between the reconstructed phase speed and its observed counterpart was 0.73,exceeding the 99% confidence level with an F-test.A composite analysis of the fast and slow groups indicated that the VOC zonal length scale was modulated by the background *** el Nino(La Ni?a)-like SST pattern and associated precipitation anomalies promoted a larger(smaller) VOC zonal length scale and thus a faster(slower)propagation speed.A sensitivity test with a reference point in a different longitudinal zone(120°-140°e) was ***,there were significant relationships between the MJO phase speed and the two *** correlation between the reconstructed and observed phase speed was 0.67,exceeding the 99% confidence level.

关键词： Vertical overturning circulation MJO phase speed Moist static energy tendency Linear regression model

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Implications from Subseasonal Prediction Skills of the Prolonged Heavy Snow event over Southern China in early 2008

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Advances in Atmospheric Sciences 2021年第11期38卷 1873-1888页

作者： Keyue ZHANG Juan LI Zhiwei ZHU tim LI Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China International Pacific Research Center and Department of Atmospheric Sciences University of Hawaii at ManoaHonolulu 96822Hawaii

An exceptionally prolonged heavy snow event(PHSe)occurred in southern China from 10 January to 3 February 2008,which caused considerable economic losses and many *** what extent any dynamical model can predict such an extreme event is crucial for disaster prevention and ***,we found the three S2S models(eCMWF,CMA1.0 and CMA2.0)can predict the distribution and intensity of precipitation and surface air temperature(SAT)associated with the PHSe at 10-day lead and 10−15-day lead,*** success is attributed to the models’capability in forecasting the evolution of two important low-frequency systems in the tropics and mid-latitudes[the persistent Siberian High and the suppressed phase of the Madden−Julian Oscillation(MJO)],especially in the eCMWF ***,beyond the 15-day lead,the three models show almost no skill in forecasting this *** bias in capturing the two critical circulation systems is responsible for the low skill in forecasting the 2008 PHSe beyond the 15-day *** one hand,the models cannot reproduce the persistence of the Siberian High,which results in the underestimation of negative SAT anomalies over southern *** the other hand,the models cannot accurately capture the suppressed convection of the MJO,leading to weak anomalous southerly and moisture transport,and therefore the underestimation of precipitation over southern *** Singular Value Decomposition(SVD)analyses between the critical circulation systems and SAT/precipitation over southern China shows a robust historical relation,indicating the fidelity of the predictability sources for both regular events and extreme events(e.g.,the 2008 PHSe).

关键词： prolonged heavy snow event S2S prediction models subseasonal prediction skill MJO Siberian High

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Impacts of the Diurnal Cycle of Radiation on Tropical Cyclone Intensification and Structure

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Advances in Atmospheric Sciences 2014年第6期31卷 1377-1385页

作者： Ge Xuyang MA Yue ZHOU Shunwu tim LI earth System Modeling Center Nanjing University of Information Science and Technology College of Atmospheric Science Nanjing University of Information Science and Technology Key laboratory of Meteorological Disaster Nanjing University of Information Science and Technology International Pacific Research Center University of Hawaii Honolulu HI 96822 USA

To investigate the impacts of the diurnal cycle on tropical cyclones （TCs）,a set of idealized simulations were conducted by specifying different radiation （i.e.,nighttime-only,daytime-only,full diurnal cycle）.It was found that,for an initially weak storm,it developed faster during nighttime than *** impacts of radiation were not only on TC intensification,but also on TC structure and *** nighttime storm tended to have a larger size than its daytime *** nighttime,the radiative cooling steepened the lapse rate and thus reduced the static stability in cloudy regions,enhancing *** heating associated with outer convection induced boundary layer inflows,which led to outward expansion of tangential winds and thus increased the storm size.

关键词： solar shortwave radiation tropical cyclone structure intensification diurnal cycle

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National Lists of Scholarly Publication Channels: An Overview and Recommendations for Their Construction and Maintenance

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Journal of Data and Information Science 2021年第1期6卷 50-86页

作者： Janne Pölönen Raf Guns emanuel Kulczycki Gunnar Sivertsen tim C.e.engels Federation of Finnish Learned Societies Snellmaninkatu 1300170 HelsinkiFinland University of Antwerp Faculty of Social SciencesCentre for R&D Monitoring(ECOOM)Middelheimlaan 12020 AntwerpBelgium Adam Mickiewicz University Scholarly Communication Research GroupSzamarzewskiego 89c60-568 PoznańPoland Nordic Institute for Studies in Innovation Research and Education(NIFU)P.O.Box 28150608 TøyenOsloNorway

Purpose: This paper presents an overview of different kinds of lists of scholarly publication channels and of experiences related to the construction and maintenance of national lists supporting performance-based research funding systems. It also contributes with a set of recommendations for the construction and maintenance of national lists of journals and book ***/methodology/approach: The study is based on analysis of previously published studies, policy papers, and reported experiences related to the construction and use of lists of scholarly publication channels. Findings: Several countries have systems for research funding and/or evaluation, that involve the use of national lists of scholarly publication channels(mainly journals and publishers). Typically, such lists are selective(do not include all scholarly or non-scholarly channels) and differentiated(distinguish between channels of different levels and quality). At the same time, most lists are embedded in a system that encompasses multiple or all disciplines. This raises the question how such lists can be organized and maintained to ensure that all relevant disciplines and all types of research are adequately represented. Research limitation: The conclusions and recommendations of the study are based on the authors' interpretation of a complex and sometimes controversial process with many different stakeholders *** implications: The recommendations and the related background information provided in this paper enable mutual learning that may feed into improvements in the construction and maintenance of national and other lists of scholarly publication channels in any geographical context. This may foster a development of responsible evaluation ***/value: This paper presents the first general overview and typology of different kinds of publication channel lists, provides insights on expert-based versus metrics-based evaluation, and formulates a set of recommend

关键词： Publication channel lists Research funding Scholarly communication Journal ranking

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Sensitivity of the Warm Core of Tropical Cyclones to Solar Radiation

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Advances in Atmospheric Sciences 2015年第8期32卷 1038-1048页

作者： Ge Xuyang MA Yue ZHOU Shunwu tim LI Key Laboratory of Meteorological Disaster Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology International Pacific Research Center University of Hawaii

To investigate the impacts of solar radiation on tropical cyclone （TC） warm-core structure （i.e., the magnitude and height）, a pair of idealized simulations are conducted by specifying different strengths of solar shortwave radiation. It is found that the TC warm core is highly sensitive to the shortwave radiative effect. For the nighttime storm, a tendency for a more intense warm core is found, with an elevated height compared to its daytime counterpart. As pointed out by previous studies, the radiative cooling during nighttime destabilizes the local and large-scale environment and thus promotes deep moist convec- tion, which enhances the TC＇s intensity. Due to the different inertial stabilities, the diabatic heating in the eyewall will force different secondary circulations. For a strong TC with a deeper vertical structure, this promotes a thin upper-level inflow layer. This inflow carries the lower stratospheric air with high potential temperature and descends adiabatically in the eye, resulting in significant upper-level warming. The Sawyer-eliassen diagnosis further confirms that the height of the maximum temperature anomaly is likely attributable to the balance among the forced secondary circulations.

关键词： tropical cyclone warm core structure solar radiation

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