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題 名 | TAMEX期間P-3飛機溫度觀測之分析與校正 |
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作 者 | 何臺華; 張茂興; 周仲島; | 書刊名 | 大氣科學 |
卷 期 | 23:3/4 民84.09-12 |
頁 次 | 頁383-406 |
分類號 | 328.291 |
關鍵詞 | 中尺度對流系統; 濕化問題; 飛機溫度校正; MCSs; Wetting effect; Temperature correction; |
語 文 | 中文(Chinese) |
中文摘要 | 1987年TAMEX實驗期間,NOAA P-3氣象研究飛機總共進行了十次觀測任務,提供那年臺灣地區梅雨季各種中尺度對流系統(含鋒面系統)之內部熱、動力結構與液態水含量等重要的第一手資料。因為P-3氣象飛機觀測頗多時間在雲內進行,溫度、露點的感應器多少會遭遇濕化的問題,加上氣流造成的誤差與鹽分的污染使低層產生觀測值偏高的問題。首先需解決溫度、露點濕化的問題,經過調整後的熱力參數所求出的相當位溫,雖然在定性上可用來解釋所觀測天氣系統的熱力特性,但會出現氣象上無法解釋的高值,特別是在低層大氣。由於這些偏高的相當位溫可理解是因飛機觀測偏高的溫度、露點值造成的,所以定量上要如何去除飛機觀測偏高的溫度、露點值,提供使用者合理的熱力參數,乃是本文研究的重要課題。 在濕化部份,可配合液態水含量的多寡來校正之,但由研究的結果發現,並沒有一簡單關係式可尋,而需視個案天氣系統的特性而定。在溫度、露點偏高部份,利用探空測站資料、地面觀測資料與飛機下視輻射儀觀測的海面溫度做校驗,可找出不同高度上飛機溫度、露點量測的合理修正值。 |
英文摘要 | During the TAMEX period the NOAA P-3 aircraft experienced 10 flight missions and provided invaluable in-situ data and radar data on mesoscale convective systems over the Taiwan area. The collection of the measured data should improve the data set for observational case study analysis and numerical model initialization and verification. The temperature sensors mounted on the P-3 aircraft are usually affected by the flow distortion and salt contamination as well as the wetting. The flow distortion problem can be avoided in use of the CO₂ radiometer instead of the Rosemount sensor. The salt contamination is negligible for high altitude flights. Only the wetting effect is difficult to deal with due to that most of the flights during TAMEX were in cloud. In order to solve the problem, first of all, we check the magnitude of liquid water content because it's reliable sign to realize the effect serious or not. Generally, 0.3 gm⁻³ is a critical value. Furthermore, the surface-grounded sounding data, traditional surface data and the sea surface temperatures of the aircraft downward-looking radiometer are applied to correct the in-situ temperature data of the aircraft. The correction scheme is simple and the results are reasonable, but it highly depends upon the features of weather systems. |
本系統中英文摘要資訊取自各篇刊載內容。