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首页> 外文期刊>Earth, planets and space: EPS >Characteristics of gravity waves observed with intensive radiosonde campaign during November-December 2005 over western Sumatera
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Characteristics of gravity waves observed with intensive radiosonde campaign during November-December 2005 over western Sumatera

机译：2005年11月至12月在苏门答腊岛西部进行的密集无线电探空仪活动中观测到的重力波特征

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Characteristics of gravity waves are studied using radiosonde campaign conducted during November-December 2005 at Koto Tabang (KT, 0.2°S, 100.32°E). Intensive sounding with hourly launches was also conducted on seven days to study the characteristics of short period (2-6 hours) waves along with EAR data. Gravity waves with period (τ) of 3 hours and vertical wavelength (λz) of 10 km seemed to be generated due to localized convection around KT, which is inferred from X-band Doppler radar. The energy of the gravity wave with period of 2-3 days and vertical wavelength of 3-5 km is largest between 15 and 20 km and 25 and 30 km. We also report the comparison of the wave activity and its interaction with background wind between the three campaigns (CPEA-I, CPEA-II and Nov. 2002). Most of the time waves are propagating towards east and the source of gravity waves is strongly related to the slowly eastward-advecting tropospheric convection, implying that the wave activity was generated at far distant sources located west of KT. A key finding of this study is neither short period nor long-period gravity waves are generated during stationary type of convection. The change in the propagation direction of the short period waves within the event is observed which is not expected.
机译：利用2005年11月至12月在Koto Tabang（KT，0.2°S，100.32°E）进行的探空仪研究了重力波的特征。还进行了为期7天的每小时发射一次密集测深，以研究短时（2-6小时）电波的特征以及EAR数据。由X波段多普勒雷达推断，由于KT附近的局部对流，似乎产生了周期（τ）为3小时，垂直波长（λz）为10 km的重力波。重力波的能量为2-3天，垂直波长为3-5 km，在15至20 km和25至30 km之间最大。我们还报告了三个活动（CPEA-I，CPEA-II和2002年11月）之间海浪活动及其与背景风的相互作用的比较。大多数时间波是向东传播的，重力波的源与缓慢向东移动的对流层对流密切相关，这意味着波的活动是在KT以西的遥远源产生的。这项研究的关键发现是在固定式对流过程中不会产生短周期或长周期重力波。观察到事件中短周期波传播方向的变化是无法预料的。

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