程胡华,王益柏. 2021. 不同阶曲线拟合扰动场对下平流层重力波气候特征影响研究[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.013
不同阶曲线拟合扰动场对下平流层重力波气候特征影响研究
Studing the climatic characteristics of gravity wave parameters constitutes
投稿时间:2019-09-09  修订日期:2020-10-19
DOI:10.11676/qxxb2021.013
中文关键词:  曲线拟合  扰动场  重力波参数  气候特征
英文关键词:Curve fitting  disturbance field  gravity wave parameters  climatic characteristics
基金项目:中国科学院战略性先导科技专项(A类)(XDA17010105)和国家自然科学基金项目(41305131)
作者单位E-mail
程胡华 63729部队 chenghuhua1983@163.com 
王益柏  397849854@qq.com 
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中文摘要:
      研究重力波参数气候特征是确定大气模式中重力波参数化方案的重要条件之一,高垂直分辨率探空资料扰动场是获取重力波参数气候特征的基础数据;目前,获取扰动场的方法较多,但基于不同方法计算的扰动场,对重力波参数气候特征影响的研究较少。基于2014—2017年山西太原气象台高垂直分辨率探空资料,利用2—4阶曲线拟合方法获取下平流层(17—24km)温度扰动场、纬向风扰动场和经向风扰动场,经统计发现2阶与3阶曲线拟合方法之间的扰动场相似程度更高;在此选取相似度更高的2阶、3阶曲线拟合方法扰动场分别计算大气重力波参数,并对大气重力波参数之间的气候差异特征进行研究,结果表明:(1)不同阶曲线拟合方法扰动场的变化振幅、及随高度变化趋势存在差异,且扰动场之间的相关性较弱;(2)2阶、3阶曲线拟合方法扰动场得到的重力波参数大小、年内变化趋势、及在不同区间范围内占有率均存在差异,且相关性较弱;(3)在1—12月,相对3阶曲线拟合方法扰动场,基于2阶曲线拟合方法扰动场得到的重力波群速、水平波长、垂直波长、周期、固有相速均偏大,而重力波能量上传百分比在某些月份偏大;]因此,不同阶曲线拟合方法扰动场之间存在的差异,会导致计算得到的大气重力波参数气候特征存在差异,最终对研制大气模式中的大气重力波参数化方案效果产生影响。
英文摘要:
      Studing the climatic characteristics of gravity wave parameters constitutes an important part of the parameterization of gravity waves in the development of a global atmospheric model,Using high vertical resolution sounding data disturbance field is the basic data to obtain the climate characteristics of gravity wave parameters. At present, there are many methods to obtain the disturbance field, but there are few studies on the influence of the disturbance field on the calculated climate characteristics of the gravity wave parameters. based on the high vertical resolution sounding data of the Taiyuan Meteorological Observatory in Shanxi from 2014 to 2017, The 2-4 order curve fitting method are used to obtain the vertical profile of temperature disturbance field, zonal wind disturbance field, and meridional wind disturbance field of the lower stratosphere (17-24km), Statistics show that the disturbance fields between second-order and third-order curve fitting methods are more similar, therefore, the second-order and third-order curve fitting methods are selected to calculate the atmospheric gravity wave parameters, and their difference characteristics between the atmospheric gravity wave parameters are statistically analyzed. The results are as follows: (1)disturbance fields from different-order curve fitting methods show different amplitudes, different trends with height, and weak correlation; (2)gravity wave parameters obtained by the second-order and third-order curves fitted disturbance fields are different in the size, the annual variation trend and occupancy rate within different intervals, the correlation is weak; (3)from January to December, compared with the third-order curve fitted disturbance field, the gravity wave group velocity, horizontal wavelength, vertical wavelength, period, and intrinsic phase velocity obtained by the disturbance field from the second-order curve fitting method are larger, and fraction of upgoing energy is also larger in some months. Therefore, it needs to pay attention that the disturbance fields from different- order curve fitting methods are different, which leaded to the climatic characteristics of the calculated atmospheric gravity parameters waves are also different, and will eventually influence the effect of the parameterization scheme in the atmospheric model.
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