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THE FORCING OF ANOMALOUS divergent wind AND TRANSIENT VORTICITY FLUXES TO THE ANOMALY OF STATIONARY WAVES

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Acta meteorologica Sinica 1997年第1期11卷 1-11页

作者：耿全震黄荣辉 National Climate Center Beijing 100081 Institute of Atmospheric Physics Chinese Academy of Sciences.Beijing 100080

The forcing of anomalous divergent wind and transient vorticity fluxes to the anomaly of stationary waves of DJF (December—January—February) 1982/1983 is *** results show that the anomaly of the transient vorticity flux convergence tends to cancel or dissipate the anomaly of the vorticity sources generated by divergent *** stationary wave anomalies are maintained by both of these *** is also found that,for the DJF 1982/1983 case,both of the vorticity source anomaly over the tropical and equatorial eastern Pacific and that over the midlatitude North Pacific are important to maintain the atmospheric circulation anomaly over the Pacific/North America region.

关键词： divergent wind transient vorticity flux stationary wave anomaly forcing

On the Variation of divergent Flow： An Eddy-flux Form Equation Based on the Quasi-geostrophic Balance and Its Application

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Advances in Atmospheric Sciences 2017年第5期34卷 599-612页

作者： Shenming FU Jie CAO Xingwen JIANG Jianhua SUN International Center for Climate and Environment Sciences Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Laboratory of Cloud Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China fnstitute of Plateau Meteorology China Meteorological Administration Chengdu 610072 China

Based on basic equations in isobaric coordinates and the quasi-geostrophic balance,an eddy-flux form budget equation of the divergent wind has been derived. This newly derived budget equation has evident physical significance. It can show the intensity of a weather system,the variation of its flow pattern,and the feedback effects from smaller-scale systems(eddy flows). The usefulness of this new budget equation is examined by calculating budgets for the strong divergent-wind centers associated with the South Asian high,and the strong divergence centers over the Tibetan Plateau,during summer(June–August) 2010. The results indicate that the South Asian high significantly interacts with eddy flows. Compared with effects from the mean flow(background circulation),the eddy flows’ feedback influences are of greater importance in determining the flow pattern of the South Asian high. Although the positive divergence centers over the Tibetan Plateau intensify through different mechanisms,certain similarities are also obvious. First,the effects from mean flow are dominant in the rapid intensification process of the positive divergence center. Second,an intense offsetting mechanism exists between the effects associated with the eddy flows’ horizontal component and the effects related to the eddy flows’ convection activities,which weakens the total effects of the eddy flows significantly. Finally,compared with the effects associated with the convection activities of the mean flow,the accumulated effects of the eddy flows’ convection activities may be more favorable for the enhancement of the positive-divergence centers.

关键词： divergent wind quasi-geostrophic balance scale interactions South Asia high

Modified Mackenzie Equation and CVOA Algorithm Reduces Delay in UASN

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Computer Systems Science & Engineering 2022年第5期41卷 829-847页

作者： R.Amirthavalli S.Thanga Ramya N.R.Shanker Department of Computer Science and Engineering Velammal Engineering CollegeChennai66India Department of Information Technology R.M.D Engineering CollegeTiruvallur1206India Department of Computer Science and Engineering Aalim Muhammed Salegh College of EngineeringChennai55India

In Underwater Acoustic Sensor Network(UASN),routing and propagation delay is affected in each node by various water column environmental factors such as temperature,salinity,depth,gases,divergent and rotational *** sound velocity increases the transmission rate of the packets and the high dissolved gases in the water increases the sound *** dissolved gases and sound velocity environment in the water column provides high transmission rates among UASN *** this paper,the Modified Mackenzie Sound equation calculates the sound velocity in each node for energy-efficient *** Ratio Optimization Method(GROM)and Gaussian Process Regression(GPR)predicts propagation delay of each node in UASN using temperature,salinity,depth,dissolved gases *** gases,rotational and divergent winds,and stress plays a major problem in UASN,which increases propagation delay and energy *** values from GPR and GROM leads to node selection and Corona Virus Optimization Algorithm(CVOA)routing is performed on the selected *** proposed GPR-CVOA and GROM-CVOA algorithm solves the problem of propagation delay and consumes less energy in nodes,based on appropriate tolerant delays in transmitting packets among nodes during high rotational and divergent *** simulation results,CVOA Algorithm performs better than traditional DF and LION algorithms.

关键词： Gaussian process regression(GPR) golden ratio optimization method(GROM) corona virus optimization algorithm(CVOA) water column variation dissolved gases acoustic speed divergent wind rotational wind

MAINTENANCE MECHANISMS OF THE STATIONARY WAVE ANOMALY TELECONNECTION PATTERNS IN THE UPPER TROPOSPHERE

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维普期刊数据库

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Acta meteorologica Sinica 1998年第3期12卷 288-299页

作者：耿全震黄荣辉 National Climate Center Beijing 100081 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100080

The spatial structure and temporal variations of the stationary wave anomalies in the upper troposphere during the Northern Hemisphere winter are studied with the ECMWF data of 1980— 1988 and PCA(principal component analysis)*** vorticity source anomalies of the main teleconnection patterns are analyzed,and their roles in the maintenance of the stationary wave anomaly teleconnection patterns are investigated with the harotropic *** results show that the anomalies of transient vorticity flux convergences tend to cancel the anomaly of vorticity sources generated by divergent *** stationary wave anomaly patterns caused by divergent wind anomalies only are very different from ***,if the anomalous transient vorticity flux convergences are also included in the vorticity sources,the simulated patterns will be greatly improved.

关键词： teleconnection pattern maintenance mechanism divergent wind transient vorticity flux anomaly

Energetics characteristics accounting for the low-level wind’s rapid enhancement associated with an extreme explosive extratropical cyclone over the western North Pacific Ocean

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Atmospheric and Oceanic Science Letters 2020年第5期13卷 426-435页

作者： JIN Shuanglong FENG Shuanglei SHEN Wei FU Shenming JIANG Lizhi SUN Jianhua State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research InstituteBeijingChina Power Equipment Status Evaluation Department Electric Power Research Institute of the State Grid Shaanxi Electric Power CompanyXi’anChina International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Laboratory of Cloud–Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

During mid-January 2011,a rarely seen twin-extratropical-cyclone event appeared over the western North Pacific *** of the twin cyclones developed into an extreme explosive extratropical cyclone(EEC),which was comparable to the intensity of a *** and divergent wind kinetic energy(KE)analyses were applied to understand the low-level wind’s rapid enhancement associated with the *** was found that:(i)the total wind KE associated with the EEC showed a remarkable enhancement in the lower troposphere during the cyclone’s maximum development stage,with the maximum/minimum wind acceleration appearing in the southeastern/northwestern quadrant of the EEC;(ii)the rotational wind KE experienced an obvious increase,which corresponded to the total wind KE enhancement,whereas the divergent wind KE,which was much smaller than the rotational wind,mainly featured a decreasing trend;(iii)the rotational wind KE enhancement showed variational features consistent with the horizontal enlargement and upward stretching of the EEC;(iv)the nonorthogonal wind KE enhanced the total wind KE in regions with strong rotational wind,which resulted in the maximum lower-tropospheric maximum wind,whereas in regions with strong divergent wind it mainly reduced the total wind KE;(v)the northward transport of total wind KE and the rotational wind KE production due to the work done by pressure gradient force were dominant factors for the enhancement of winds associated with the EEC,particularly in its southeastern *** contrast,an overall conversion from rotational wind KE to divergent wind KE decelerated the rotational wind enhancement.

关键词： Explosive extratropical cyclone rotational wind divergent wind kinetic energy twin cyclones