• 検索結果がありません。

Inertia-Gravity Waves at Upper Troposphere/ Lower Stratosphere Region: An Observational Study from 205 MHz Wind Profiler Radar.

N/A
N/A
Info
ダウンロード
Protected

Academic year: 2021

シェア "Inertia-Gravity Waves at Upper Troposphere/ Lower Stratosphere Region: An Observational Study from 205 MHz Wind Profiler Radar."

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)

Inertia-Gravity Waves at Upper Troposphere/ Lower Stratosphere Region: An Observational Study from 205 MHz Wind Profiler Radar.

Ajil Kottayil

(1)

, K . Satheesan

(1)

, K . Mohankumar

(1)

and Titu K. Samson

(1)

(1) Advanced centre for atmospheric radar research, Cochin University of Science and Technology, India, [email protected], +918547744679

A unique wind profiler operating at 205 MHz frequency has been set up at the Advanced Centre for Atmospheric Radar Research (10.04˚ N; 76.33˚E), Cochin University of science and Technology, India. This stratosphere-troposphere radar has been providing accurate three dimensional wind profiles for an altitude range of 315 m to 20 km. The wind profiler constitutes 619, three element Yagi-Uda antennae with a power aperture product of 1.6x10

8

W m

2

. In this paper, we present the characteristics of inertia gravity waves (IGW) observed at upper troposphere/lower stratosphere from all round observations of wind profiles taken during November 22 to 27, 2016. The waves were observed between the altitudes of 14-20 km and the presence of IGW was detected in zonal, meridional and vertical wind profiles.

Hodograph analysis performed on the horizontal wind for a monochromatic frequency

shows a clock wise rotation of the ellipse, which indicates an upward propagation of energy

from upper troposphere to lower stratosphere. Other wave characteristics like its intrinsic

frequency wavelength, vertical wavelength, horizontal wavelength etc. were also derived

from hodograph analysis. These waves were observed in conjunction with a persisting deep

depression over the Bay of Bengal. The satellite data analysis further suggests the presence

of over-shooting deep convective clouds over the Bay of Bengal during depression. It is

hence possible that the IGW were triggered due to the perturbation of upper level wind by

deep convection. This is the first time that IGW are being detected from 205 MHz wind

profiler radar. These kinds of waves over tropical region will have profound influence on

mass exchange from troposphere to stratosphere and thereby modulating the stratosphere

dynamics.

参照

今ダウンロードする ( PDF - 1 ページ - 41.51 KB )

関連したドキュメント

We show the existence of the traveling wave so- lutions for this system by this iteration scheme

A monotone iteration scheme for traveling waves based on ordered upper and lower solutions is derived for a class of nonlocal dispersal system with delay.. Such system can be used

2 Well–ordered lower and upper functions

The nonlinear impulsive boundary value problem (IBVP) of the second order with nonlinear boundary conditions has been studied by many authors by the lower and upper functions

#A1 INTEGERS 14 (2014) UPPER AND LOWER BOUNDS ON B

Erd˝ os, Some problems and results on combinatorial number theory, Graph theory and its applications, Ann.. New

Existence Theorems for First-Order Equations on Time Scales with Δ -Carath ´eodory Functions

In this paper, we introduce a new notion which generalizes to systems of first-order equations on time scales the notions of lower and upper solutions.. Our notion of solution tube

Islands at infinity on manifolds of asymptotically nonnegative curvature

In this paper, we will study the “islands” (geodesic balls with all sectional curvatures bounded from below by a positive constant) at infinity on complete Riemannian manifolds

This model can be derived from the f-plane governing equations for the geographical water waves with a constant underlying current in the equatorial water waves with effect of the Coriolis force

Zhang; Blow-up of solutions to the periodic modified Camassa-Holm equation with varying linear dispersion, Discrete Contin. Wang; Blow-up of solutions to the periodic

We present an approach to the problem of the blow up at the triple junction of three fluids in equilibrium

We use the monotonicity formula to show that blow up limits of the energy minimizing configurations must be cones, and thus that they are determined completely by their values on

An invariant of link cobordisms from Khovanov homology

Khovanov associated to each local move on a link diagram a homomorphism between the homology groups of its source and target diagrams.. In this section we describe how this