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Role of Ocean Dynamics in the Seasonal Hadley Cell:A Response to Idealized Arctic Amplification

Advances in Atmospheric Sciences 2023年第12期40卷 2211-2223页

作者： Haijin DAI qiang yao College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

How atmospheric and oceanic circulations respond to Arctic warming at different timescales are revealed with idealized numerical *** by local forcing and feedback,Arctic warming appears and leads to sea-ice ***-water formation is inhibited,which weakens the Atlantic Meridional Overturning Circulation(AMOC).The flow and temperature in the upper layer does not respond to the AMOC decrease immediately,especially at mid-low ***,nearly uniform surface warming in mid-low latitudes enhances(decreases)the strength(width)of the Hadley cell(HC).With the smaller northward heat carried by the weaker AMOC,the Norwegian Sea cools *** strong warming in Northern Hemisphere high latitudes,the long-term response triggers the“temperature-wind-gyre-temperature”cycle,leading to colder midlatitudes,resulting in strong subsidence and Ferrel cell enhancement,which drives the HC *** weaker warming in the tropics and stronger warming at high latitudes,there is a stronger HC with decreased width.A much warmer Southern Hemisphere appears due to a weaker AMOC that also pushes the HC *** idealized model results suggest that the HC strengthens under both warming conditions,as tropical warming determines the strength of the HC ***,extreme Arctic warming led by artificially reduced surface albedo decreases the meridional temperature gradient between high and low latitudes,which contracts the ***,a warmer mid-high latitude in the Northern(Southern)Hemisphere due to surface albedo feedback(weakened AMOC)in our experiments pushes the HC northward(southward).In most seasons,the HC exhibits the same trend as that described above.

关键词： Hadley cell Arctic amplification Southern Hemisphere warming Atlantic Meridional Overturning Circulation

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LOCAL ANALYSIS OF THE FULLY DISCRETE LOCAL DISCONTINUOUS GALERKIN METHOD FOR THE TIME-DEPENDENT SINGULARLY PERTURBED PROBLEM

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Journal of Computational Mathematics 2017年第3期35卷 265-288页

作者： yao Cheng qiang Zhang Department of Mathematics Nanjing University Nanjing 210093 Jiangsu Province China

In this paper we consider the fully discrete local discontinuous Galerkin method, where the third order explicit Runge-Kutta time marching is coupled. For the one-dimensional time-dependent singularly perturbed problem with a boundary layer, we shall prove that the resulted scheme is not only of good behavior at the local stability, but also has the double-optimal local error estimate. It is to say, the convergence rate is optimal in both space and time, and the width of the cut-off subdomain is also nearly optimal, if the boundary condition at each intermediate stage is given in a proper way. Numerical experiments are also given.

关键词： Local analysis Runge-Kutta method Local discontinuous Galerkin method,Singularly perturbed problem Boundary layer

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Oxidation behavior of a kind of carbon black

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Science China(Technological Sciences) 2009年第6期52卷 1535-1542页

作者： JunShi Tang qiang Song BaiLei He qiang yao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering Tsinghua University Beijing 100084 China

The DTG curves of a kind of carbon black during TPO tests were found to have multiple peaks with an unusual sharp peak after the main *** tests with different sample loads,oxygen fractions and heating rates were carried out to study the influence of the experimental parameters on the sharp *** results show that the sharp peak is not caused by heat and mass transfer limitations,but by the intrinsic oxidation kinetics of the carbon *** evolution of the specific surface area during the intrinsic kinetic controlled oxidation process was then analyzed using isothermal oxidation at low temperatures which showed that the sharp peak is caused by the increase of the specific surface *** pore structure changes greatly influence the oxidation process when the reaction is controlled by the intrinsic *** there were no heat and mass transfer limitations,the different oxidation processes result in the same specific surface area evolution.

关键词： thermal analysis carbon black multiple peaks specific surface area

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Magnitude of the 23 January 2018 M7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska

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Journal of Earth Science 2019年第5期30卷 1005-1009页

作者： Chen Song qiang yao Dun Wang Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration Wuhan 430071 China State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Wuhan 430074 China

We apply a novel method to estimate the magnitude of the 23 January 2018 M7.9 Alaska earthquake using seismic stations recorded at local to regional distances in Alaska, US. We determine the source duration from back-projection results derived from the Alaska stations in a relatively compact azimuth range. Then we calculate the maximum P-wave displacements recorded on a wide azimuth range at distances of 8 to 15 degrees. Combining the source duration and the maximum P-wave displacements, we obtain magnitudes of 7.86–8.03 for the 23 January 2018 earthquake in 3–5 min, very close to the Mw 7.9 determined by the USGS and GCMT. This example validates the new approach for determining magnitude of large earthquakes using local to regional stations, and its time efficiency that magnitudes of large earthquakes can be accurately estimated within in 3–5 min after origin time. Therefore, further application of this new method would help accurate estimation of size of earthquakes that occur offshore and might cause tsunami hazards.

关键词： rapid magnitude estimation back-projection real-time seismology tsunami warning geophysics

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Morphology and phase composition of MAO ceramic coating containing Cu on Ti6Al4V alloy

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Rare Metals 2017年第8期36卷 671-675页

作者： Si-Rong Yu qiang yao Hong-Chao Chu College of Mechanical and Electrical Engineering ChinaUniversity of Petroleum(Huadong)Qingdao 266580China

A ceramic coating containing Cu element was prepared on Ti6Al4V alloy using micro-arc oxidation（MAO）*** copper ions were added to the electrolyte solution of aluminate salt,the anode voltage in MAO process reduces,and the micropore size on the surface of the ceramic coating is more *** crystalline phases of the ceramic coatings prepared in the electrolyte solutions with and without copper ions are mainly Ti element,rutile TiO_2,and anatase TiO_*** addition of copper ions to the electrolyte solution makes rutile TiO_2 content decrease but promotes the formation of Al_2TiO_5 *** spectrum test results confirm that by adding copper ions to the electrolyte solution,the ceramic coating formed in the process of MAO contains copper element.

关键词： Micro-arc oxidation Ti alloy Copper ion Ceramic coating

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Oxidation characteristics of boron particles

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Science China(Technological Sciences) 2015年第12期58卷 2016-2024页

作者： YU Dan KONG ChengDong ZHUO JianKun LI ShuiQing yao qiang Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal EngineeringTsinghua University

The oxidation characteristics of boron particles, boron-A with the diameter of 2.545 μm and boron-B with the diameter of 10.638 μm, at low temperature（1500 K） have been investigated by thermogravimetry（TG） coupled with simultaneous differential scanning calorimetry（DSC）, infrared and mass spectra. A rapid oxidation stage of boron particles, followed by a slow oxidation stage of sintered particles, is found from the TG and DSC curves. The onset temperatures of the oxidation process of boron-A particles are in the range of 806–889 K, which are at least 105 K lower than those of boron-B at the same condition. As the partial pressure of oxygen increases from 5% to 35%, the onset temperature of boron-A or boron-B particles decreases. However, when the partial pressure of oxygen is above 35%, the onset temperature becomes constant, implying a saturation effect of oxygen on the reaction rate. It indicates that the chemical adsorption of oxygen, i.e. chemical reaction, on the particle surface is the rate-limited step at the beginning of the rapid oxidation stage. Therefore, the first-order chemical reaction model is used to simulate the oxidation of boron particles, even that of the sinter. The average activation energies of the particles are 291.3 kJ/mol for boron-A and 338.4 k J/mol for boron-B. While the average activation energies of the sintered particles are 36.35 k J/mol for boron-A and 31.87 kJ/mol for boron-B. The pre-exponential factor of the particles is -10^4, while that of the sinter is 10^-1. The oxidation rate constant of boron is qualitatively mainly affected by the specific surface of the sample and the thickness of the oxide layer.

关键词： boron particles oxidation activation energy saturation effect

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High performance liquid chromatographic separation of clausenamide enantiomers with chiral-AGP stationary phase

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Chinese Chemical Letters 2010年第7期21卷 860-863页

作者： Yan Wang Qing qiang yao Mu Zou Wang Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical CollegeBeijing 100050China Institute of Materia Medica Shandong Academy of Medical ScienceJinan 250062China

A method of high performance liquid chromatographic separation of clausenamide enantiomers with chiral-AGP（α_1-acid glycoprotein） stationary phases has been *** absolute configurations of（-）clausenamide and（＋）clausenamide are 3S, 4R,5R,6S and 3R,4S,5S,6R,*** present method has been used to analyze the（-）clausenamide and（＋）clausenamide and its analogues such as the major metabolite and synthetic derivatives of clausenamide.

关键词： Enantiomers (-)Clausenamide (+)Clausenamide Chiral-AGP HPLC

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Effect of Climate Variability and Human Activities on Runoff in the Jinghe River Basin, Northwest China

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Journal of Mountain Science 2015年第2期12卷 358-367页

作者： yao Jun-qiang ZHAO Qiu-dong LIU Zhi-hui School of Resources and Environment Science Key Laboratory of Oasis Ecology of Ministry of Education Xinjiang University Xinjiang Climate Center Xinjiang Meteorological Administration Institute of Desert Meteorology China Meteorological Administration Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Institute of Arid Ecology and Environment Xinjiang University

Much attention has recently been focused on the effects of climate variability and human activities on the runoff. In this study, we analyzed 56-yr(1957–2012) runoff change and patterns in the Jinghe River Basin(JRB) in the arid region of northwest China. The nonparametric Mann–Kendall test and the precipitation-runoff double cumulative curve(PRDCC) were used to identify change trend and abrupt change points in the annual runoff. It was found that the runoff in the JRB has periodically fluctuated in the past 56 yr. Abrupt change point in annual runoff was identified in the JRB, which occurred in the years around 1964 and 1996 dividing the long-term hydrologic series into a natural period(1957 – 1964) and a climate and man-induced period(1965 – 1996 and 1997 – 2012). In the 1965 – 1996 period, human activities were the main factor that decreased runoff with contribution of 88.9%, while climate variability only accounted for 11.1%. However,the impact of climate variability has been increased from 11.1% to 47.5% during 1997 – 2012, showing that runoff in JRB is more sensitive to climate variability during global warming. This study distinguishes theeffect of climate variability from human activities on runoff, which can do duty for a reference for regional water resources assessment and management.

关键词： Water resource Runoff Climate variability Precipitation Jinghe River Basin

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Estimating Seismic Intensity Maps of the 2021 Mw 7.3 Madoi,Qinghai and Mw 6.1 Yangbi,Yunnan,China Earthquakes

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Journal of Earth Science 2022年第4期33卷 839-846页

作者： Wenkai Chen Dun Wang Can Zhang qiang yao Hongjun Si Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou 730000China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China Seismological Research Institute Inc. Tokyo 113-0032Japan

This study focuses on rapidly determining seismic intensity maps of earthquakes because it offers fundamental information for effective emergency rescue and subsequent scientific research,and remains challenging to accurately determine seismic intensity map in regions with sparse instrumental *** we applied a novel method that consisted of array technology(backprojection),ground-motion prediction equations,and site corrections,to estimate the seismic intensity maps of the 2021 Mw 7.3 Madoi,Qinghai and the Mw 6.1 Yangbi,Yunnan,China *** used seismic data recorded at European stations to back-project the source processes of the 2021 Mw7.3 Madoi,Qinghai and the Mw 6.1 Yangbi,Yunnan,China *** back-projected energy radiations were then used as subevents or used to define the fault *** the contributions of each subevent or estimating the shortest distances from each site to the rupture fault,we obtained the ground motion(PGA and PGV)for each site under rock site *** estimated ground motions were corrected at each site for local site amplification according to the Vs30 *** estimated seismic intensity maps and field reports showed high similarity,which further validated the effectiveness of the novel approach,and pushed the limit of earthquake size down to~M *** efforts would substantially help in the fast and accurate evaluation of earthquake damage,and precise rescue efforts.

关键词： earthquakes seismic intensity map back-projection ground-motion prediction equations

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Determination and Comparison of M_(L),M_(S_BB),m_(B),M_(Wp),M_(WW),M_(dt),and M(GNSS)for the 22 May 2021 M7.4 Madoi,qianghai,China Earthquake

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Journal of Earth Science 2022年第4期33卷 847-856页

作者： Xiaolin Huang Yuyang Peng Chuang Cheng Dun Wang qiang yao State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China

The 2021 Madoi M7.4 Earthquake in Qinghai is a major earthquake that occurred in the Bajankara Block of Qinghai-Tibet Plateau in the past 30 years,which spatially filled the seismogenic gap in the eastern section of the northern boundary of the *** we determined the values of M_(L),M_(S_BB),m_(B),M_(Wp),M_(WW),M_(dt),and M(GNSS)by abundant regional and global seismic and geodetic observations,which is 6.61,7.43,7.18,7.33,7.43,7.38,and 7.4,*** compare the time efficiency and stability of different magnitude scales,we generated a real-time environment,to iteratively determine the magnitudes over elapsed *** methods such as m_(B),M_(S_BB),M_(Wp) gave considerable variations of as large as 0.5 units for the determined magnitudes with elapsed time,as more data were *** such as M_(WW) and M_(dt) were very stable with increasing data over *** systematic calculations of various magnitude scales in this study quantitively evaluated the stability and accuracy of those methods,shading light on the adaptability and applicability of different magnitude scales.

关键词： the 2021 Madoi Earthquake earthquake magnitude magnitude scale earthquakes

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