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The coupling instability of Rossby and topographic Rossby waves in the equatorial area

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Science china Earth Sciences 2005年第10期48卷 1792-1801页

作者： chao {1.1.2, liu Lin1.3 & YU Weidong1.1. Laboratory of marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061. china 2. National Research center for marine environmental Forecasts, State Oceanic Administration, beijing 1.0081. china 3. Ocean University of china, Qingdao 266003, china Laboratory of marine Science and Numerical Modeling State Oceanic Administration Qingdao {1. National Research center for {1. environmental Forecasts State Oceanic Administration beijing china Ocean University of china Qingdao china

In case of considering the fact that the tropical ocean thermocline or the lower at-mosphere height field has the meridional variation, the topographic Rossby wave will be excited. Also the background geostrophic current emerges. Under such conditions, the topographic Rossby wave can interact with the classical Rossby wave at some parameter band and thus brings a new kind of instability, which may be of potential application in understanding some phenomena of the ENSO cycle.

关键词： thermocline variation, equatorial jet, Rossby wave, topographic Rossby wave, coupling instability

Semi-analytical analysis of the response of the air temperature over the land surface to the global vegetation distribution

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Chinese Science Bulletin 2009年第14期54卷 2499-2505页

作者： liu fei1,2 & chao jiping3,4 1 Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 100029, china 2 Graduate University of Chinese Academy of Sciences, beijing 100049, china 3 National marine environmental forecasting center, beijing 1.0081. china 4 First Institute of Oceanography, State Oceanic Administration of china, Qingdao 266061, china Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China National marine {1. forecasting center Beijing 100081 China First Institute of Oceanography State Oceanic Administration of China Qingdao 266061 China

Response of the air temperature over the land surface to the global vegetation distribution is investigated, using a three-dimensional governing equation to simulate the steady, large-scale, limited amplitude perturbation of the free, inviscid and adiabatic atmosphere. The adoption of the static equation leads to a temperature governing equation in the terrain following coordinate. With the prescribed temperature as the upper boundary condition and the radiation balance as the lower boundary condition, the semi-analytical solution of the global circulation temperature can be calculated. In this article, only the air temperature (at 2 m height) over the land surface is analyzed, and the result suggests that this model can simulate the air temperature pattern over the land surface reasonably. A better simulation occurs when a simple feedback of the albedo on the temperature is included. Two sensitivity experiments are analyzed through this model. One suggests that the air temperature over the land surface descends obviously when the land surface is covered with ice all over, while another suggests that the air temperature rises a little when the land surface is covered with forest except the ice-covered area. This model appears to be a good tool to study the response of the air temperature to the vegetation distribution. Limitations of the model are also discussed.

关键词：空气温度植被分布陆地表面反应解析分析模拟模式控制方程边界条件

Evolution of desertification in a two-dimensional energy balance model coupled with thermodynamics and dynamics

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Science china Earth Sciences 2010年第11期53卷 1726-1733页

作者： chao {1.1.2 & LI YaoKun3,4 1.ational marine environmental forecasting center, beijing 1.0081. china 2First Institute of Oceanography, State Oceanic Administration, Qingdao 266061. china 3State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 1.0029, china 4Graduate University of Chinese Academy of Sciences, beijing 1.0049, china 1. National marine {1. forecasting center Beijing 100081 China2. First Institute of Oceanography State Oceanic Administration Qingdao 266061 China3. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China4. Graduate University of Chinese Academy of Sciences Beijing 100049 China

The relationship between desert evolution and change in albedo has been investigated quasi-analytically using a zonal mean two-dimensional energy balance model which considers the radiation transmission process due to thermodynamics and bound- ary layer movement caused by kinetics. A climate state including temperature, zonal wind, meridional wind and vertical wind can be simulated according to the current zonal distribution of albedo. Given desert distribution, characterized by the value and distribution of albedo, the response of climate on albedo has been studied to analyze the evolution of desert climate. One significant result is that the simple model can reproduce mean meridional circulation. Another result indicates that climate corresponds to two equilibria. This happens when the junction temperature between vegetation and desert is higher than a certain critical value. As for the first equilibrium, the desert belt is predicted to move southward in the northern hemisphere with the increasing values of albedo, which corresponds to the current trend of climate change. For the second equilibrium, vegetation will expand northward with increasing values of albedo, which would indicate a narrowing of the desert belt. In order to determine if the two equilibria exist, new physical models are needed.

关键词： two-dimensional energy balance model desertification two equilibria

Dominant climate factors influencing the Arctic runoff and association between the Arctic runoff and sea ice

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Acta Oceanologica Sinica 2010年第5期29卷 10-20页

作者： LI Pixue ZHANG Zhanhai liu {1. Ocean University of china Qingdao 266100 China Polar Research Institute of china Shanghai 200136 China State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Shanghai marine {1. Monitoring and forecasting center Shanghai 200232 China

By using the Arctic runoff data from R-ArcticNET V4.0 and ArcticRIMS,trends of four major rivers flowing into the Arctic Ocean,whose climate factor plays an important role in determining the variability of the Arctic runoff,are *** results show that for the past 30 years,the trend of the Arctic runoff is seasonally *** is a significant trend in spring and winter and a significant decreasing trend in summer,leading to the reduced seasonal *** spring,surface air temperature is the dominant factor influencing the four *** summer,precipitation is the most important factor for Lena and Mackenzie,while snow cover is the most important factor for Yenisei and *** Mackenzie,atmospheric circulation does play an important role for all the seasons,which is not the case for the Eurasian *** authors further discuss the relationships between the Arctic runoff and sea *** negative correlation is found at the mouth of the rivers into the Arctic Ocean in spring,while significant positive correlation is observed just at the north of the mouths of the rivers into the Arctic in *** addition,each river has different relationship with sea ice in the eastern Greenland Sea.

关键词： Arctic runoff multiple linear regressions sea ice

Multiple equilibria of cross-equatorial Inertial jets

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Science china Earth Sciences 2007年第1期50卷 153-160页

作者： chao jiping1,2 & liu fei3,4 1 National marine environmental forecasting center, beijing 1.0081. china 2 The First Institute of Oceanography ,SOA, Qingdao 266060, china 3 Key Laboratory Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 100029, china 4 Graduate University of Chinese Academy of Sciences, beijing 100039, china 1. National marine {1. forecasting center Beijing 100081 China 2. The First Institute of Oceanography SOA Qingdao 266060 China 3. Key Laboratory Regional Climate-Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 4. Graduate University of Chinese Academy of Sciences Beijing 100039 China

Based on the developed Anderson and Moore's theory about cross-equatorial inertial jets and a nonlinear equivalence shallow water model, new universal functions are determined by the characters of the vortical large-scale air flow (atmosphere) or ocean current (ocean) related to the jet, then the potential vorticity and energy conservation equations along the streamline in the cross-equatorial in-ertial jets can be obtained. Because the governing equations are nonlinear, some limited multiple equi-libria of cross-equatorial inertial jets may exist. According to the character of large-scale air flow or ocean current outside the jets, the existent criterion for multiple eqnilibria in cross-equatorial inertial jets is discussed, and two examples for multiple equilibia of nonlinear governing equations are given.

关键词： multiple equilibria cross-equatorial inertial jets the potential vorticity energy conservation.

A semi-analytical model for the propagation of Rossby waves in slowly varying flow

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Chinese Science Bulletin 2011年第25期56卷 2727-2731页

作者： liu {1. chao jiping HUANG Gang FENG LiCheng Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China International Pacific Research center University of Hawaii at Manoa Honolulu 96822 USA National marine {1. forecasting center Beijing 100081 China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100083 China

Instead of using complicated general circulation models (GCMs), a simple semi-analytical model based on ray theory has been used to study energy evolution and ray path of Rossby waves in slowly varying mean flows. Our model yields similar results to those calculated from barotropic models, and also provides a chance to study Rossby waves in the slowly varying flows with both vertical and meridional shears. The model results show that upward Rossby waves can only grow in westerlies, and decay when further ascend. The baroclinic Rossky waves are restrained by the β effect in lower latitude. In the westerly jet with meridional and vertical shears, the barotropic Rossby waves originated from south of the westerly jet, and these can grow while propagating upper-northward. The baroclinic Rossby waves originated from north of the westerly jet and can grow while propagating upward and southward. Such a semi-analytical model provides a simple forecasting tool to allow study of the local weather anomalies to the heating/topography forcing associated with the global warming.

关键词： Rossby波半解析模型传播模式大气环流模型变流西风急流 GCMS 射线路径

Estimation of Incidence of Herpes Zoster in Three Cities of china,201.-2020

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Biomedical and environmental Sciences 2024年第9期37卷 1091-1094页

作者： Qian Zhang Wei Qin Zhenshui Huang Lilin Liang Qianqian Hu Yao Wang Fan Pan Feng Cui Xinli liu Lin Tang Xiaoqi Wang {1. Ma Fuzhen Wang Zundong Yin National Key Laboratory of Intelligent Tracking and forecasting for Infectious Disease Beijing 102206China National Immunization Program Chinese Center for Disease Control and PreventionBeijing 100050China Lu’an center for Disease Control and Prevention Lu’an 23700Anhui China Zibo center for Disease Control and Prevention Zibo 255026ShandongChina Tongchuan center for Disease Control and Prevention Tongchuan 727031ShaanxiChina

Herpes zoster(HZ)is a painful condition resulting from reactivation of dormant varicella-zoster virus(VZV)in a previously VZV-infected person[1..Typical clinical manifestation of HZ are unilateral radicular pain and a vesicular rash limited to one side of the body in the distribution of a nerve[2].The most common complication of HZ postherpetic neuralgia(PHN).

关键词： zoster Herpes clinical

Assimilating the along-track sea level anomaly into the regional ocean modeling system using the ensemble optimal interpolation

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Acta Oceanologica Sinica 2014年第7期33卷 72-82页

作者： LYU Guokun WANG Hui ZHU Jiang WANG Dakui XIE jiping {1. Guimei Physical Oceanography Laboratory Ocean University of China Key Laboratory of Research on marine Hazards {1. National Marine Environmental Forecasting CenterState Oceanic Administration College of environmental Science and Engineering Ocean University of China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences International center for Climate and {1. Sciences Institute of Atmospheric Physics Chinese Academy of Sciences

The ensemble optimal interpolation （EnOI） is applied to the regional ocean modeling system （ROMS） with the ability to assimilate the along-track sea level anomaly （TSLA）. This system is tested with an eddy-resolving system of the South china Sea （SCS）. Background errors are derived from a running seasonal ensemble to account for the seasonal variability within the SCS. A fifth-order localization function with a 250 km localization radius is chosen to reduce the negative effects of sampling errors. The data assimilation system is tested from January 2004 to December 2006. The results show that the root mean square deviation （RMSD） of the sea level anomaly decreased from 1..57 to 6.70 cm, which represents a 36.6% reduction of error. The data assimilation reduces error for temperature within the upper 800 m and for salinity within the upper 200 m, although error degrades slightly at deeper depths. Surface currents are in better agreement with trajectories of surface drifters after data assimilation. The variance of sea level improves significantly in terms of both the amplitude and position of the strong and weak variance regions after assimilating TSLA. Results with AGE error （AGE） perform better than no AGE error （NoAGE） when considering the improvements of the temperature and the salinity. Furthermore, reasons for the extremely strong variability in the northern SCS in high resolution models are investigated. The results demonstrate that the strong variability of sea level in the high resolution model is caused by an extremely strong Kuroshio intrusion. Therefore, it is demonstrated that it is necessary to assimilate the TSLA in order to better simulate the SCS with high resolution models.

关键词： ensemble optimal interpolation regional ocean modeling system along-track sea level anomaly South china Sea variability

风廓线雷达在北京地区一次强沙尘天气分析中的应用

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中国环境科学 2018年第5期38卷 1663-1669页

作者：刘超张碧辉花丛张恒德吴东丽国家气象中心北京100081 中国气象局气象探测中心北京100081

基于北京地区逐小时风廓线雷达数据、大气成分观测数据以及地面常规观测资料对201.年5月3~7日一次沙尘天气过程进行了研究.结果表明:受蒙古气旋影响,全国多地出现空气质量严重污染,其中北京PM1.浓度达到严重污染级别时间超过30h.通过对... 详细信息

基于北京地区逐小时风廓线雷达数据、大气成分观测数据以及地面常规观测资料对201.年5月3~7日一次沙尘天气过程进行了研究.结果表明:受蒙古气旋影响,全国多地出现空气质量严重污染,其中北京PM1.浓度达到严重污染级别时间超过30h.通过对边界层内水平风场、垂直速度以及大气折射率结构常数等要素进行分析,研究发现沙尘爆发前,边界层内出现平均风速达到1..8m/s的西北急流核,该急流核的建立有利于将高层沙尘粒子向近地面传输,而沙尘爆发阶段边界层通风量较前期增加31.6%,中低层的通风量逐渐占据主导地位,使近地面PM_(1.)浓度出现爆发性增长.此外,整个沙尘天气过程中,以弱下沉运动为主,垂直速度在1./s以下,而沙尘天气爆发前,边界层内出现强烈垂直下沉运动,达到5.3m/s.同时,大气折射率结构常数出现1.0×1.^(-1.)的高值中心.二者均先于地面污染物浓度的变化,预报时间提前量为8~9h,可为今后沙尘预报提供一定参考.

关键词：沙尘风廓线边界层通风量垂直速度