“气象经济“概念辨析

从新时期气象对社会经济建设的影响、气象事业自身的发展等角度对"气象经济"的内涵进行了深入的探讨和分析,并进而提出了使我国部分可以面向市场的气象服务健康发展的对策和措施.     

九江市2003年夏季高温干旱成因分析

通过对2003年7月～8月上旬九江严重高温干旱的大尺度环流形势背景分析,并与历年同期500hPa环流特征对比,发现副热带高压强盛稳定、西风带纬向环流偏强、经向环流偏弱是九江地区夏季高温干旱的主要原因。     

江西省气象局徽标设计浅谈

从主题的确定、要素的挖掘及表现、形式美法的应用等方面,详细介绍了江西省气象局徽标的设计过程。设计制作的江西省气象局徽标,通过环绕的橄榄枝代表世界气象,通过中间的中国气象局徽标代表中国气象,通过杜鹃花代表江西,进一步体现了江西气象部门在弘扬“管天为民、追求卓越”的江西气象精神的基础上,将立足江西、面向全国、走向世界,努力实现江西气象事业的跨越式发展,从而为建设“四个一流”的江西气象事业和建设和谐平安江西,做出更大的贡献。     

赣南脐橙种植气候区划

分析了赣南气候与脐橙生长发育的关系,应用GIS技术对赣南脐橙种植进行气候区划,并根据区划结果提出了相关的建议和对策。     

江西省农业气象观测记录报表信息化管理系统

提出了江西省农业气象观测记录报表信息化管理系统建立的必要性及依据,重点介绍了该系统的结构、系统模块与功能及其新增技术特点。     

玉山信木柚栽培的气候可行性分析

根据信木柚所要求的气候条件,从气候学的角度分析了玉山种植信木柚的可行性,并提出了高产优质栽培措施。     

Micaps V2.0本地化经验浅谈

根据抚州市气象台Micaps V2．0的运行情况,从参数检索控制文件的本地化设置、主窗口显示的工具条及控件框本地化设置,以及制作必要的新底图文件、参数启动文件、批命令文件和定义综合图等方面,探讨了地市级气象台Micaps V2．0本地化过程中遇到的一些问题,以及解决办法和日常维护经验。这对县级台站的Micaps V2．0本地化设置也有一定的指导意义。     

南昌多普勒雷达计算机系统传输网络的构造及常见故障处理

介绍了南昌多普勒雷达计算机网络系统结构、网络配置及常见故障现象,并提出具体的故障处理方法。     

Rotation Of Trajectories In Lagrangian Stochastic Models Of Turbulent Dispersion

We present a new measure for the rotation of Lagrangian trajectories in turbulence that simplifies and generalises that suggested by Wilson and Flesch ( Boundary-Layer Meteorol. 84, 411–426). The new measure is the cross product of the velocity and acceleration and is directly related to the area, rather than the angle, swept out by the velocity vector. It makes it possible to derive a simple but exact kinematic expression for the mean rotation of the velocity vector and to partition this expression into terms that are closed in terms of Eulerian velocity moments up to second order and unclosed terms. The unclosed terms arise from the interaction of the fluctuating part of the velocity and the rate of change of the fluctuating velocity.We examine the mean rotation of a class of Lagrangian stochastic models that are quadratic in velocity for Gaussian inhomogeneous turbulence. For some of these models, including that of Thomson ( J. Fluid Mech. 180, 113–153), the unclosed part of the mean rotation vanishes identically, while for other models it is non-zero. Thus the mean rotation criterion clearly separates the class of models into two sets, but still does not provide a criterion for choosing a single model.We also show that models for which = 0 are independent of whether the model is derived on the assumption that total Lagrangian velocity is Markovian or whether the fluctuating part is Markovian.     

Measurements Of Fine-Scale Structure At The Top Of Marine Stratocumulus

During the Dynamics and Chemistry of the MarineStratocumulus (DYCOMS) experiment in July–August 1985, the NCAR Electra aircraft flew a series of flight legs just at the top of the marinestratocumulus cloud decks that cap the mixed layer off the coast of southernCalifornia. Because of the corrugated structure of the cloud-top, the aircraft, which was flown at a nearly constant level and adjusted only to maintain its altitude at the average cloud-top height, was alternately within and above the clouds – roughly half the time in each domain. These legs were used to examine the structure of the cloud-top by compositing the segments on either side of the cloud/clear-air interface, which was identified by the transitions of liquid water measured by the Forward Scattering Spectrometer Probe (either increasing or decreasing) through a threshold of 0.04 × 10^-3 kg m^-3.An equivalent vertical distance (EVD) from the cloud-top was obtained from the horizontal flight legs by estimating the average slope of the cloud-top from the cloud-top radiation temperature. The results show that a near discontinuity occurs in variables across cloud top over an EVD of 0.3 m, but that above this, the air has already been modified by boundary-layer air. Thus, cloud-top is not the limit of mixing of boundary-layer air. This mixing may extend to tens of metres or more. The bulk Richardson number in the vicinity of cloud-top increases from near zero within the cloud to about 1.2 at an EVD of 3–6 m above cloud. Fluctuations of the three velocity components within cloud are nearly equal; above cloud the vertical component structure function is about half the horizontal components. The scalar structure functions are about an order of magnitude higher above cloud than in cloud. The structure parameters of temperature and humidity measured just below cloud-top agree reasonably well with predicted values based on a previously-developed model for the clear convective boundary layer. Above cloud, the scalar structure parameters are much larger, but their interpretation is questionable, since this region does notcontain isotropic turbulence.