杭州飞机气象观测资料处理及质量分析
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浙江省气象科技计划项目(项目编号:2021YB14)资助


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

    为了更好地将全球共享的飞机气象观测资料(AMDAR资料)应用于本地气象业务,解决由AMDAR资料时空分布不均匀带来的应用不便的问题,利用2019年4月至2020年5月杭州地区获取的AMDAR资料,在质量控制处理基础上提出一种新的提取AMDAR廓线数据的处理方法,将机场周边一定时间和空间范围内的飞机探测资料视作探空气球漂移至不同位置的观测,垂直方向采用插值算法实现廓线数据均匀分布,并利用中值滤波算法对廓线做进一步质控。最终提取的AMDAR廓线数据与杭州探空数据进行了对比误差分析。结果表明:温度、风速和风向的总体平均偏差分别为-0.83 ℃、0.02 m/s、0.47°,均方根误差分别为1.93 ℃、2.02 m/s、25.05°,AMDAR温度廓线数据整体偏小,且相对暖湿的季节比相对干冷的季节偏小更加明显,AMDAR风廓线数据无明显系统误差,数据质量较好;温度和风速对比误差在2000 m及以上高度范围随高度增加而增大,但风向的对比误差相反;环境风速越大,风速的对比误差越大,风向的对比误差却越小;AMDAR廓线数据与探空数据具有较好的一致性,但在02:00—06:00以及5000 m以上高度缺测较多。总体来看,本文提出的AMDAR廓线提取方法具有一定的应用价值,能够为AMDAR资料在不同地区的应用提供参考。

    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,杨明.杭州飞机气象观测资料处理及质量分析[J].气象科技,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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  • 在线发布日期: 2023-12-28
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