温度和密度扰动对大气动力学的计算研究

IF 1.1 Q3 PHYSICS, MULTIDISCIPLINARY
A. Abawari, Yitagesu Elfaged
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引用次数: 0

摘要

这项研究考察了潮湿空气的温度和密度对9°1'48〃N、38°44'24〃E和地表以上6.324公里处大气变量的扰动效应。大气是一种可压缩的中性潮湿空气,以旋转的地球为模型,其基本大气参数,如气体常数、传输系数、混合比和比热容,被认为与温度有关,地球的重力随纬度和海拔高度而变化。为了描述动力学,我们在未绘制的网格上使用有限差分法进行了数值计算。我们的结果表明,所有变量的响应都具有平面波模式,其中比热容(SHCs)、合成风速(RWS)和水蒸气混合比(MR)在每个纬度随时间增加,而垂直风速(VWS)、比焓(SE)和压力在每个纬度随着时间降低。MR随时间的增加是进入空气包的水蒸气通量的结果,SE随时间的减小和RWS随时间的增大是热能向机械能转换的结果。VWS随时间的减小是由于粘度的温度依赖性而引起的粘性力的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Computational study of temperature and density perturbations on atmospheric dynamics
This study examines the perturbation effect of temperature and density of moist air on atmospheric variables at 9°1’48″N, 38°44’24″E and 6.324 km above the Earth’s surface. The atmosphere is a compressible neutral moist air flowing on a rotating Earth as a model and it’s basic atmospheric parameters such as gas constant, transport coefficients, mixing ratio and specific heat capacities are considered to be temperature dependent and the Earth’s gravity changes with latitude and altitude. To describe the dynamics, we carried out a numerical computation using finite difference method on an unstaggered grid. Our results revealed that the response of all the variables have a plane wave pattern, in which specific heat capacities (SHCs), resultant wind speed (RWS) and water vapor mixing ratio (MR) increase with time at each latitude but vertical wind speed (VWS), specific enthalpy (SE) and pressure decrease with time at each latitude. The increase of MR with time is the result of water vapor flux into the air parcel and the decrease of SE and increase of RWS with time is the result of thermal energy to mechanical energy transformation. The decrease of VWS with time is the effect of the viscous force due to temperature dependence of viscosity.
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来源期刊
Journal of Physics Communications
Journal of Physics Communications PHYSICS, MULTIDISCIPLINARY-
CiteScore
2.60
自引率
0.00%
发文量
114
审稿时长
10 weeks
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