杭州飛機氣象觀測資料處理及質量分析
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浙江省氣象科技計劃項目(項目編號:2021YB14)資助


Data Processing and Quality Assessment of Aircraft Meteorological Observation around Hangzhou
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    摘要:

    為了更好地將全球共享的飛機氣象觀測資料(AMDAR資料)應用于本地氣象業務,解決由AMDAR資料時空分布不均勻帶來的應用不便的問題,利用2019年4月至2020年5月杭州地區獲取的AMDAR資料,在質量控制處理基礎上提出一種新的提取AMDAR廓線數據的處理方法,將機場周邊一定時間和空間范圍內的飛機探測資料視作探空氣球漂移至不同位置的觀測,垂直方向采用插值算法實現廓線數據均勻分布,并利用中值濾波算法對廓線做進一步質控。最終提取的AMDAR廓線數據與杭州探空數據進行了對比誤差分析。結果表明:溫度、風速和風向的總體平均偏差分別為-0.83 ℃、0.02 m/s、0.47°,均方根誤差分別為1.93 ℃、2.02 m/s、25.05°,AMDAR溫度廓線數據整體偏小,且相對暖濕的季節比相對干冷的季節偏小更加明顯,AMDAR風廓線數據無明顯系統誤差,數據質量較好;溫度和風速對比誤差在2000 m及以上高度范圍隨高度增加而增大,但風向的對比誤差相反;環境風速越大,風速的對比誤差越大,風向的對比誤差卻越??;AMDAR廓線數據與探空數據具有較好的一致性,但在02:00—06:00以及5000 m以上高度缺測較多??傮w來看,本文提出的AMDAR廓線提取方法具有一定的應用價值,能夠為AMDAR資料在不同地區的應用提供參考。

    Abstract:

    In order to more effectively apply the globally shared AMDAR (Aircraft Meteorological Data Relay) data in local meteorological operations and address the challenge stemming from the uneven spatio-temporal distribution of AMDAR data, this paper initially conducts quality control processing using AMDAR data from April 2019 to May 2020 around Hangzhou. This is carried out with reference to the aircraft meteorological observation quality control scheme of the NOAA in the United States and the National Meteorological Information Centre. Following this, a new method is proposed for extracting AMDAR profile data, taking into consideration the determination of the temporal, spatial representation, and vertical resolution of AMDAR data. This method views AMDAR data within a specific temporal and spatial range around the airport as analogous to the observations of a weather balloon drifting to different positions, thereby extracting temperature and wind vertical profiles based on specified temporal and spatial representativeness. In the vertical direction, the interpolation algorithm is utilised to achieve a uniform distribution of the profile, and median filtering algorithm is carried out on the obtained profile data for additional quality control. Our results from comparing the AMDAR profile data with Hangzhou radiosonde data demonstrate that the overall average differences in temperature, wind speed, and wind direction between the AMDAR data and radiosonde data in Hangzhou are -0.83 ℃, 0.02 m/s, and 0.47°respectively. The root mean square errors amount to 1.93 ℃ for temperature, 2.02 m/s for wind speed, and 25.05° for wind direction. There is a trend toward the AMDAR temperature profile data being smaller than the radiosonde temperature data, as a result of the systematic error of aircraft detection. It should be noted that this is more evident in relatively warm and wet seasons compared to relatively dry and cold seasons. Notably, the AMDAR wind profile data do not exhibit clear systematic error, which leaves the data quality in a satisfactory state. The comparison errors of temperature and wind speed are slightly realigned in the boundary layer height range of 0-1000 m compared to 1000-2000 m, which increase with the increase in height in the 2000 m and above range. However, the comparison error of wind direction drastically diminishes with the increase in height in the whole comparison height range. Furthermore, the higher the ambient wind speed, the greater the comparison error of wind speed, but the smaller the comparison error of wind direction. The AMDAR profile data and radiosonde data show a good level of agreement, although in terms of data integrity, there appear to be numerous missing measurements in 02:00-06:00 and above 5000 m. This is attributed to the limitations of aircraft detection influenced by specific flight times and routes. In conclusion, the AMDAR profile extraction method proposed in this paper elucidates the temporal and spatial representation of AMDAR profile data. Furthermore, by ensuring it is evenly distributed in time and height, this contributes to convenience in meteorological operations. This new AMDAR profile extraction method indeed holds certain application value and can offer a reference point for local application of AMDAR data in different regions.

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高祝宇,何妤斐,楊明.杭州飛機氣象觀測資料處理及質量分析[J].氣象科技,2023,51(6):794~804

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  • 收稿日期:2022-10-26
  • 定稿日期:2023-09-15
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  • 在線發布日期: 2023-12-28
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