FY-4A/LMI閃電與浙江三維閃電對比分析
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浙江省氣象科技計劃項目(2020YB13)資助


Comparative Analysis between FY-4A/LMI Lightning Data and Three-Dimensional Lightning Data in Zhejiang Province
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    摘要:

    為進一步加強星地閃電觀測資料運用,本文基于2020年6—8月FY-4A/LMI閃電數據(LMIG)和浙江省ADTD-2C三維閃電定位數據,對比分析兩套閃電數據的時空分布特征,并結合雷達和云頂亮溫資料,分析了2020年7月15日浙江省雷暴過程兩套閃電觀測資料的演變規律。結果表明:2010年6—8月,浙江省LMIG與三維閃電比值為1∶44.43;兩套資料閃電月分布和空間分布總體一致;就日分布而言,LMIG呈現雙峰結構,三維閃電則為單峰結構。兩套數據時間匹配窗口大于1.8 s、經緯度匹配窗口大于0.5°時,匹配率趨于穩定;與LMIG匹配的三維閃電高度主要集中在16 km以下,閃電強度主要集中在50 kA以下。2020年7月15日浙江省午后雷暴天氣,LMIG與三維閃電比值為1∶25.44;LMIG首次閃電及峰值時間均滯后于三維閃電首次閃電及峰值時間;此外兩套閃電資料時間演變與雷暴發展有較好的對應,空間變化與云頂亮溫低值區也有較好的對應。

    Abstract:

    In order to further strengthen the application of satellite-to-ground lightning, the spatial-temporal distribution characteristics and spatial-temporal matching features are comparatively analysed in Zhejiang Province based on lightning data from FengYun (FY)-4A Lightning Mapping Imager (LMI) and Advanced Direction and Time-of-arrival Detecting (ADTD)-2C three-dimensional lightning location system from June to August in 2020. In addition, by combining reflectivity of Doppler radar mosaics and cloud top brightness temperature from FY-4A Advanced Geosynchronous Radiation Imager (AGRI), the spatial and temporal evolution patterns of lightning data from two observation systems are analysed during a thunderstorm process in Zhejiang Province on 15 July 2020. The results show that from June to August in 2020, the number of LMIG detected by LMI was 8483, while the number of lightning detected by the ADTD-2C three-dimensional lightning location system was 376932. The ratio of the two sets of data was approximately 1∶44.43. The monthly and spatial distributions of lightning detected by these two systems were generally consistent, while diurnal variation of which were different. Specifically, diurnal variation of LMIG presented two peaks, and diurnal variation of three-dimensional lightning showed only one peak. Besides, when the time matching window was larger than 1.8 seconds, and the latitude and longitude matching window was larger than 0.5°, the matching rate gradually tended to be stable. Furthermore, the height of three-dimensional lightning matched with LMIG was mainly concentrated below 16 km, and the lightning intensity of which was mainly concentrated below 50 kA. During the thunderstorm weather in Zhejiang Province in the afternoon on 15 July 2020, the ratio of LMIG to three-dimensional lightning was approximately 1∶25.44. The time of the first LMIG and its peak time were both later than the time of the first three-dimensional lightning and its peak time. What’s more, the lightning data observed by the two systems corresponded well with the development process of the thunderstorm. When the thunderstorm was at the developing stage, the number of lightning data detected by the two systems was both gradually increasing, and when the thunderstorm was at the mature stage, the number of lightning data detected by the two systems was both maintaining a relatively high value, and when the thunderstorms were at the dissipation stage, the number of lightning data detected by the two systems was both decreasing rapidly. When it came to the spatial distribution of the lightning, both of the two datasets corresponded well with the spatial distribution of low cloud top brightness temperature.

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張祎,邊學文,徐震宇,王康挺,王芳. FY-4A/LMI閃電與浙江三維閃電對比分析[J].氣象科技,2024,52(3):424~433

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  • 收稿日期:2023-05-11
  • 定稿日期:2024-01-16
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  • 在線發布日期: 2024-06-25
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