利用福衛三號研究赤道波動現象; Equatorial waves observed using FORMOSAT-3 GPS Occultation

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Title:	利用福衛三號研究赤道波動現象;Equatorial waves observed using FORMOSAT-3 GPS Occultation
Authors:	蔡玉嫈;Yu-Ying Tsai
Contributors:	太空科學研究所
Keywords:	赤道波動;間熱帶輻合區;克耳文波;福衛三號;ITCZ;FORMOSAT-3/COSMIC;Kelvin wave;equatorial waves
Date:	2008-06-06
Issue Date:	2009-09-22 09:48:33 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	運用福衛三號（FORMOSAT-3/COSMIC）衛星在2006年8月至2008年2月的觀測資料，我們分析出赤道大氣克耳文波（Kelvin wave）於低層平流層之結構與傳播方向，以及印度地區間熱帶輻合區（intertropical convergence zone，簡稱ITCZ）南北移動的情形。在大氣克耳文波方面，由溫度變動值的變化我們可以看到，在水平方向上，赤道大氣克耳文波相位有隨時間向東傳播的現象，相速度約為2680 km/day，結果並顯示在高度19公里處，波數為一以及二的周期分別為12－17天及8－12天；在垂直方向上，赤道大氣克耳文波相位結構隨高度向東傾斜，相位隨時間向下傳播，相速度約為0.5-1 km/day，垂直波長在2006年及2007年分別為4-6公里及6-10公里。在ITCZ方面，由福衛三號衛星資料演算出的水汽含量資料發現，高水汽含量區域隨時間在緯度位置上呈現約一年的變化，分別在二月及八月時移動到最南端以及最北端。配合地面降水量及長波輻射資料對應，水汽含量資料表現了ITCZ隨時間在緯度位置變化的特性。 Structure and propagation of equatorial atmospheric Kelvin waves and the latitudinal migration of intertropical convergence zone （ITCZ） during August 2006 and February 2008 are observed using FORMOSAT-3/COSMIC data. Zonal Kelvin wave derived from temperature fluctuations at 19 km characterize eastward phase propagation with the phase speed 2680 km/day, the wave periods are 12-17 days for zonal wave number 1 and 8-12 days for wave number 2. The vertical structure of Kelvin wave tilts eastward with height between 18-30 km, the phase propagates downward with the phase speed 0.5-1 km/day, and vertical wavelengths are 4-6 km in 2006 and 6-10 km in 2007. Integrated water vapor derived from COSMIC data shows one year variation in time-latitude section, high value region moved to the most southern part and northern part on February and August. It shows the characteristics of the latitudinal migration of ITCZ.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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