• 検索結果がありません。

Fine Structure of Vertically Propagating Kelvin Waves and Tropopause Height Variability at Upper Troposphere and Lower Stratosphere Observed by Equatorial Atmospheric Radar (EAR)

N/A
N/A
Info
ダウンロード
Protected

Academic year: 2021

シェア "Fine Structure of Vertically Propagating Kelvin Waves and Tropopause Height Variability at Upper Troposphere and Lower Stratosphere Observed by Equatorial Atmospheric Radar (EAR)"

Copied!
1
0
0

読み込み中.... (全文を見る)

今ダウンロードする ( 1 ページ )

全文

(1)

[ここに入力]

Fine Structure of Vertically Propagating Kelvin Waves and Tropopause Height Variability at Upper Troposphere and Lower

Stratosphere Observed by Equatorial Atmospheric Radar (EAR)

Eddy Hermawan

(1)

and Hiroyuki Hashiguchi

(2)

(1) Center for Atmospheric Sciences and Technology, National Institute of Aeronautics and Space (LAPAN), Jalan Dr. Djundjunan No. 133, Bandung 40173, Indonesia

E-mail: [email protected]

(2) Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

E-mail: [email protected]

The relationship among local convection, vertically propagating Kelvin waves, and tropopause height variability is examined. This study utilizes the Equatorial Atmospheric Radar (EAR) observational datasets and NCEP-NCAR re-analysis data. Spectral analyses both Fast Fourier Transform (FFT) and Wavelet (WL) techniques are used to investigate the propagation of Kelvin waves over Kototabang, West Sumatera, Indonesia. In addition, the statistical analyses both Cross Correlation Function (CCF) and Cross Spectral (CS) are also done to investigate the correlation between Kelvin waves and Tropical Tropopause Layer (TTL).

Based on EAR data for the period of December 2001 to December 2008, the Kelvin waves are detected by propagation in the zonal wind anomaly eastward and vertically. The analysis of power spectrum during that time is showing a Kelvin wave which has the period of 18 days at 17.41 km altitude. Kelvin waves were found near the tropopause layer (~ 17 km). While, the analysis of power spectrum during wet and dry season is showing Kelvin wave energy in wet season (DJF=December-January-February) is stronger relatively than that in dry season (JJA=June-July-August). In the wet season (DJF) Kelvin wave height of 16.97 MSL (Mean Sea Level) km is more dominant relatively in the period of 15 days. While, in dry season (JJA) Kelvin wave is more dominant relatively at 16.52 km altitude with the period of 18 days.

From statistical analysis, the cross correlation between zonal wind and tropopause height was shown. This means that the zonal wind direction indicating easterlies affect the Kelvin wave height of the tropopause. Furthermore, we analyzed Kelvin wave activities during other wet season (January to March, 2013), transition season (April to June, 2013), and dry season (July to September, 2013), respectively. We found the strongest Kelvin wave acivities occurred during wet season comparing with other periods with the period of about 20 days. Detailed information of these preliminary results including the basic idea of this research will be discussed fully at our text paper.

Keywords: Kelvin Waves, Propagation, TTL, EAR, and Spectral Analysis

参照

今ダウンロードする ( PDF - 1 ページ - 199.51 KB )

関連したドキュメント

Ergonomic design of beverage can lift tabs based on numerical evaluations of fingertip discomfort

At first, experiments of indenting vertically the fingertip pulp by a probe and tabs of the aluminum beverage can ends have been done to observe force responses and feelings in

Inverse correlation between serum levels of selenoprotein p and adiponectin in patients with type 2 diabetes

We measured blood levels of adiponectin in SeP knockout mice fed a high sucrose, high fat diet to examine whether SeP was related to the development of hypoadiponectinemia induced

its and the of a

Standard domino tableaux have already been considered by many authors [33], [6], [34], [8], [1], but, to the best of our knowledge, the expression of the

Cross Site Scripting-Latest developments and solutions: A survey

Jayamsakthi Shanmugam, Dr.M.Ponnavaikko “A Solution to Block Cross Site Scripting Vulnerabilities Based on Service Oriented Architecture”, in Proceedings of 6th IEEE

Cross-wired lamplighter groups and linearity of automata groups

They showed for any finite nonabelian group that is not a direct product of an abelian group with a 2-group which is nilpotent of class 2, its associated automata group can not embed

545 GamzeÖzel CiertaspropiedadesdeunaclasededistribucionesPoissoncompuestabivariadasyunaaplicaciónadatosdeterremotos OnCertainPropertiesofAClassofBivariateCompoundPoissonDistributionsandanApplicationtoEarthquakeData

In this paper the joint probability function, moments, cumulants, covariance and coefficient of correlation of BCPD are obtained.. can be computed accurately from (15) and its

In particular, we discuss the connection between different approaches to the analysis of such equations and the associated indices, which are the differentiation index and the strangeness index

The approach based on the strangeness index includes un- determined solution components but requires a number of constant rank conditions, whereas the approach based on

Both the parabolic flow and the gradient flow are used

Conley index, elliptic equation, critical point theory, fixed point index, superlinear problem.. Both authors are partially supportedby the Australian