不同途徑獲得的大氣重力波參數(shù)擾動(dòng)場特征對比分析
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中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項(xiàng)(A類)(XDA17010105)和國家自然科學(xué)基金項(xiàng)目(42075040)資助


Characteristic Comparison of Perturbation Fields with Different Methods for Obtaining Atmospheric Gravity Wave Parameters
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    摘要:

    重力波參數(shù)氣候特征是確定全球大氣模式中重力波參數(shù)化方案的一個(gè)重要環(huán)節(jié),利用高垂直分辨率探空資料擾動(dòng)場是獲取重力波參數(shù)氣候特征的基礎(chǔ)數(shù)據(jù)和重要手段。目前,通常采用2~4階曲線擬合、帶通濾波方法獲取高垂直分辨率探空資料擾動(dòng)場,但針對不同方法之間的擾動(dòng)場差異特征研究較少,本文利用2~4階曲線擬合、帶通濾波方法(0.5~5.0 km)獲取2014—2017年太原地區(qū)(112.55°E,37.78°N)高垂直分辨率探空資料擾動(dòng)場,采用相關(guān)系數(shù)、LombScargle、不同區(qū)間范圍占有率方法進(jìn)行研究,結(jié)果表明:①不同方法之間的緯向風(fēng)擾動(dòng)場、經(jīng)向風(fēng)擾動(dòng)場、溫度擾動(dòng)場均存在較明顯差異,且相關(guān)性均較弱;②LombScargle分析表明,不同方法得到的平均緯向風(fēng)擾動(dòng)場、平均經(jīng)向風(fēng)擾動(dòng)場、平均溫度擾動(dòng)場顯著含有(通過90%置信檢驗(yàn))的垂直波長均存在明顯差異;③不同方法得到的緯向風(fēng)擾動(dòng)場、經(jīng)向風(fēng)擾動(dòng)場、溫度擾動(dòng)場顯著含有的垂直波長,在不同區(qū)間范圍內(nèi)的占有率均存在明顯差異。

    Abstract:

    Studying 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. The disturbance fields obtained by using the highresolution radiosonde data are the basic data and important means to obtain the climate characteristics of gravity wave parameters. At present, the 2 to 4 order curve fitting and bandpass filtering methods are used to obtain the disturbance fields of high vertical resolution radiosonde data. However, there are few studies on the differences in the characteristics of disturbance fields resulted from different methods. In the paper, the disturbance fields of the high vertical resolution radiosonde data in Taiyuan (112.55°E, 37.78°N) from 2014 to 2017 are obtained by the 2 to 4 order curve fitting and bandpass filtering methods (0.5 to 5.0 km), subsequently, studied by correlation coefficient, LombScargle, and different interval range occupancy methods. The results show: (1) the disturbance fields from differentorder curve fitting methods show different amplitudes, different trends with height, and weak correlation; (2) the LombScargle analysis shows that the significant vertical wavelengths (passed the 90% confidence test) are contained in the average zonal wind disturbance fields, the average meridional wind disturbance fields and the average temperature disturbance fields from different methods, and there are significant differences; (3) the significant vertical wavelengths are contained in the zonal wind disturbance fields, meridional wind disturbance fields and temperature disturbance fields from different methods, and there are significant differences in their occupancy rate within different intervals.

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程胡華,鞠永茂,王益柏,趙亮.不同途徑獲得的大氣重力波參數(shù)擾動(dòng)場特征對比分析[J].氣象科技,2020,48(5):655~663

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  • 收稿日期:2019-09-04
  • 定稿日期:2020-06-08
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  • 在線發(fā)布日期: 2020-10-26
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