Rayleigh lidar observations of double stratopause structure over three different northern hemisphere stations

Abstract. Using four years of Rayleigh lidar data collected from three different northern hemisphere stations (Gadanki 13.5° N, 79.2° E ; Mt. Abu 24.5° N, 72.7° E and Observatoire de Haute Provence: OHP; 44° N, 6° E), the characteristics of double (separated) stratopause occurrence are presented here, for the first time. The characteristics are illustrated by a seasonal change during summer and winter and the variation in percentage of occurrence from place to place. It is found that the over-all mean normal stratopause (NS) positioned at the middle level of double stratopause (upper and lower level) with its location nearer to the lower level of double stratopause (LDS) than to the upper level of double stratopause (UDS). The frequency distribution of NS, LDS and UDS demonstrated variability with location, indicating role of dynamical activity. By making use of a quasi-continuous 40 days of lidar observations over Gadanki and OHP, the responsibility of Gravity Wave (GW) and Planetary Wave (PW) activity for the LDS and UDS occurrence are examined and presented.

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Rayleigh lidar observations of enhanced stratopause temperature over Gadanki (13.5° N, 79.2° E) during major stratospheric warming in 2006

Annales Geophysicae ◽

10.5194/angeo-27-373-2009 ◽

2009 ◽

Vol 27 (1) ◽

pp. 373-379 ◽

Cited By ~ 5

Author(s):

S. Sridharan ◽

S. Sathishkumar ◽

K. Raghunath

Keyword(s):

Gravity Wave ◽

High Latitude ◽

Planetary Wave ◽

Planetary Waves ◽

Stratospheric Warming ◽

Linear Interaction ◽

Zonal Wavenumber ◽

Low Latitudes ◽

Rayleigh Lidar ◽

Lidar Observations

Abstract. Rayleigh lidar observations of temperature structure and gravity wave activity were carried out at Gadanki (13.5° N, 79.2° E) during January–February 2006. A major stratospheric warming event occurred at high latitude during the end of January and early February. There was a sudden enhancement in the stratopause temperature over Gadanki coinciding with the date of onset of the major stratospheric warming event which occurred at high latitudes. The temperature enhancement persisted even after the end of the high latitude major warming event. During the same time, the UKMO (United Kingdom Meteorological Office) zonal mean temperature showed a similar warming episode at 10° N and cooling episode at 60° N around the region of stratopause. This could be due to ascending (descending) motions at high (low) latitudes above the critical level of planetary waves, where there was no planetary wave flux. The time variation of the gravity wave potential energy computed from the temperature perturbations over Gadanki shows variabilities at planetary wave periods, suggesting a non-linear interaction between gravity waves and planetary waves. The space-time analysis of UKMO temperature data at high and low latitudes shows the presence of similar periodicities of planetary wave of zonal wavenumber 1.

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11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America

Journal of Geophysical Research Atmospheres ◽

10.1029/2018jd028673 ◽

2019 ◽

Vol 124 (2) ◽

pp. 451-467 ◽

Cited By ~ 3

Author(s):

P. Llamedo ◽

J. Salvador ◽

A. Torre ◽

J. Quiroga ◽

P. Alexander ◽

...

Keyword(s):

South America ◽

Gravity Wave ◽

Wave Activity ◽

Rayleigh Lidar ◽

Lidar Observations

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Blend the Lab Course, Flip the Responsibility

STEM Education ◽

10.4018/978-1-4666-7363-2.ch079 ◽

2015 ◽

pp. 1483-1505

Author(s):

Mark A. Gallo

Keyword(s):

Technical Problems ◽

Student Responsibility ◽

Class Time ◽

Current State ◽

Real Value ◽

Upper Level ◽

Intensive Course ◽

First Time ◽

Blended Course

An upper-level special topics course in Applied, Environmental, and Medical Microbiology was offered for the first time. It was decided by the author to offer it as a blended course. There were some compelling reasons to do so: first and foremost, it allowed class time to be spent doing what one should in a lab-intensive course: remark on current state of knowledge and literature, describe experimental design, discuss potential outcomes, troubleshoot technical problems as they arise, and offer suggestions regarding students' research throughout the process. The ultimate goal and real value of the blended classroom in this instance was elevating the level of student responsibility and forcing them to view a science class as something more than a collection of facts: rather as a very active class, one that requires individual action. It was also designed to allow the students to participate in fundamental scientific research with the help of a mentor in a manner that was/is still practiced and in full view of peer review. The role of the faculty member changes to one of providing guidance instead of content in the classroom, and so it gives one more individual time with the students; this time can be used for diagnostic, formative, and summative assessment.

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Vertical distribution of gravity wave potential energy from long-term Rayleigh lidar data at a northern middle-latitude site

Journal of Geophysical Research Atmospheres ◽

10.1002/2014jd022035 ◽

2014 ◽

Vol 119 (21) ◽

pp. 12,069-12,083 ◽

Cited By ~ 17

Author(s):

N. Mzé ◽

A. Hauchecorne ◽

P. Keckhut ◽

M. Thétis

Keyword(s):

Potential Energy ◽

Vertical Distribution ◽

Gravity Wave ◽

Middle Latitude ◽

Lidar Data ◽

Wave Potential ◽

Rayleigh Lidar

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TRANSFER OF THE STRATOSPHERIC AEROSOL OF THE VOLCANIC ORIGIN OVER WESTERN SIBERIA IN 2008-2017 ACCORDING TO THE DATA OF TRAJECTORY ANALYSIS AND LIDAR OBSERVATIONS

Вестник КРАУНЦ. Физико-математические науки ◽

10.26117/2079-6641-2019-29-4-208-217 ◽

2019 ◽

pp. 208-217

Author(s):

А.А. Черемисин ◽

В.Н. Маричев ◽

П.В. Новиков ◽

Д.А. Бочковский

Keyword(s):

Northern Hemisphere ◽

Trajectory Analysis ◽

Western Siberia ◽

Mass Movement ◽

Stratospheric Aerosol ◽

Lidar Data ◽

Satellite Measurements ◽

Volcanic Origin ◽

Upper Troposphere ◽

Lidar Observations

В течение десятилетнего периода с 2008 по 2019 год проводились лидарные наблюдения стратосферного аэрозоля в Томске на станции высотного зондирования ИОА СО РАН. За этот период удалось зарегистрировать слои вулканического аэрозоля, возникшего в результате извержения целого ряда вулканов. Метод лагранжевых траекторий движения воздушных масс в атмосфере, построенных по данным спутниковых измерений скорости ветра в Северном полушарии, позволил связать между собой данные лидарных наземных наблюдений верхней тропосферы и стратосферы в Томске и Владивостоке, данные космического лидара CALIOP и спутниковую информация c прибора GOME-2 о распределении диоксида серы в атмосфере Северного полушария. В данной работе это показано на примере извержения вулканов Касаточи и Набро. During the ten-year period from 2008 to 2019 lidar observations of the stratospheric aerosol in Tomsk were carried out at the high-altitude sounding station of the IOA SB RAS. During this period, it was possible to register layers of volcanic aerosol resulting from the eruption of a number of volcanoes. The method of Lagrangian trajectories of air mass movement in the atmosphere based on satellite measurements of wind speed in the Northern Hemisphere made it possible to relate data from lidar ground-based observations of the upper troposphere and stratosphere in Tomsk and Vladivostok, CALIOP space lidar data and satellite information from the GOME-2 instrument distribution of sulfur dioxide in the atmosphere of the Northern Hemisphere. In this work, this is shown by the example of the eruption of the Kasatochi and Nabro volcanoes.

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