scholarly journals Effect of meteorology on the variability of ozone in the troposphere and lower stratosphere over a tropical station Thumba (8.5°N, 76.9°E)

2021 ◽  
Vol 215 ◽  
pp. 105567
Author(s):  
P.R. Satheesh Chandran ◽  
S.V. Sunilkumar ◽  
M. Muhsin ◽  
Maria Emmanuel ◽  
Geetha Ramkumar ◽  
...  
Keyword(s):  
Lower Stratosphere ◽  
Tropical Station

scholarly journals Comparison of aerosol extinction between lidar and SAGE II over Gadanki, a tropical station in India

2015 ◽  
Vol 33 (3) ◽  
pp. 351-362 ◽  
Author(s):  
P. Kulkarni ◽  
S. Ramachandran
Keyword(s):  
Meteorological Parameters ◽  
Lower Stratosphere ◽  
Stratospheric Aerosol ◽  
Lidar Measurement ◽  
Aerosol Extinction ◽  
Upper Troposphere ◽  
Measurement Site ◽  
Space And Time ◽  
The Tropics ◽  
Tropical Station

Abstract. An extensive comparison of aerosol extinction has been performed using lidar and Stratospheric Aerosol and Gas Experiment (SAGE) II data over Gadanki (13.5° N, 79.2° E), a tropical station in India, following coincident criteria during volcanically quiescent conditions from 1998 to 2005. The aerosol extinctions derived from lidar are higher than SAGE II during all seasons in the upper troposphere (UT), while in the lower-stratosphere (LS) values are closer. The seasonal mean percent differences between lidar and SAGE II aerosol extinctions are > 100% in the UT and < 50% above 25 km. Different techniques (point and limb observations) played the major role in producing the observed differences. SAGE II aerosol extinction in the UT increases as the longitudinal coverage is increased as the spatial aerosol extent increases, while similar extinction values in LS confirm the zonal homogeneity of LS aerosols. The study strongly emphasized that the best meteorological parameters close to the lidar measurement site in terms of space and time and Ba (sr−1), the ratio between aerosol backscattering and extinction, are needed for the tropics for a more accurate derivation of aerosol extinction.

scholarly journals Diurnal variation of tropospheric temperature at a tropical station

2001 ◽  
Vol 19 (8) ◽  
pp. 1001-1005 ◽  
Author(s):  
K. Revathy ◽  
S. R. Prabhakaran Nayar ◽  
B. V. Krishna Murthy
Keyword(s):  
Diurnal Variation ◽  
Vertical Velocity ◽  
Lower Stratosphere ◽  
Atmospheric Composition ◽  
Tropospheric Temperature ◽  
Composition And Structure ◽  
Mst Radar ◽  
Tropical Station ◽  
Tropopause Temperature ◽  
Radar Technique

Abstract. The vertical velocity in the troposphere-lower stratosphere region measured using MST radar has been utilized to evaluate the temperature profile in the region. The diurnal variation of the tropospheric temperature on one day in August 1998 at the tropical station Gadanki (13.5° N, 79.2° E) has been studied using the MST radar technique. The diurnal variation of the temperature revealed a prominent diurnal variation with the peak in the afternoon hours increasingly delayed in altitude. The tropopause temperature and altitude exhibited a clear diurnal cycle.Key words. Atmospheric composition and structure (pressure, density and temperature; troposphere - composition and chemistry; instruments and technique)

Vertical wave number spectra of wind fluctuations in the troposphere and lower stratosphere over Gadanki, a tropical station

2005 ◽  
Vol 67 (3) ◽  
pp. 251-258 ◽  
Author(s):  
Gopa Dutta ◽  
B. Bapiraju ◽  
T.S.P.L.N. Prasad ◽  
P. Balasubrahmanyam ◽  
H. Aleem Basha
Keyword(s):  
Lower Stratosphere ◽  
Wave Number ◽  
Tropical Station

scholarly journals Long Period Waves and Oscillations Over Costa Rica, a Tropical Station

2020 ◽  
Vol 9 (4) ◽  
pp. 64-67
Keyword(s):  
Costa Rica ◽  
Lower Stratosphere ◽  
Interannual Variations ◽  
Mixing Ratio ◽  
Long Period ◽  
Tropopause Region ◽  
Morlet Wavelet Transform ◽  
Tropical Station ◽  
Lower Period ◽  
Prominent Peak

Seasonal, annual and interannual variations of Ozone Mixing Ratio (OMR) have been studied for 12 years, from balloonsondes and Ozonesondes that were launched over Costa Rica (10oN, 83.4oW), a tropical station, as part of Southern Hemisphere Additional Ozonesondes (SHADOZ) network. It was found that near tropopause region there exists prominent peak of OMR during July month for most of the years. Lomb-Scargle Periodogram (LSP) analysis has been applied for the years 2005-2017 to identify the wave activities and found that Quasi Biennial Oscillations (QBO) with period of 2-2.5 years and even higher period oscillations of 3-4 years are prominent in middle troposphere and lower stratosphere regions which could cause large annual variabilities of OMR fluctuations. Fluctuations of OMR were subjected to Morlet wavelet transform over a year, 2008, to study seasonal variabilities. The wavelet analysis confirm that Madden Julian Oscillations (MJO) with periods 49-60 days are prominent during summer near tropopuase and in lower stratosphere regions, while lower period equatorial Kelvin waves of 14-20 days periods dominate during winter and spring in troposphere region, which could be responsible for maximum seasonal variability.

Identification of inertia gravity wave sources observed in the troposphere and the lower stratosphere over a tropical station Gadanki

2016 ◽  
Vol 176-177 ◽  
pp. 202-211 ◽  
Author(s):  
M. Pramitha ◽  
M. Venkat Ratnam ◽  
P.P. Leena ◽  
B.V. Krishna Murthy ◽  
S. Vijaya Bhaskar Rao
Keyword(s):  
Gravity Wave ◽  
Lower Stratosphere ◽  
Tropical Station

Lidar investigations on the optical and dynamical properties of cirrus clouds in the upper troposphere and lower stratosphere regions at a tropical station, Gadanki, India (13.5°N, 79.2°E)

2014 ◽  
Vol 8 (1) ◽  
pp. 083659 ◽  
Author(s):  
Vasudevannair Krishnakumar ◽  
Malladi Satyanarayana ◽  
Soman R. Radhakrishnan ◽  
Reji K. Dhaman ◽  
Glory Selvan Jayeshlal ◽  
...  
Keyword(s):  
Lower Stratosphere ◽  
Cirrus Clouds ◽  
Upper Troposphere ◽  
Dynamical Properties ◽  
Tropical Station

scholarly journals Interannual Variability and Trends in Sea Surface Temperature, Lower and Middle Atmosphere Temperature at Different Latitudes for 1980–2019

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 454
Author(s):  
Andrew R. Jakovlev ◽  
Sergei P. Smyshlyaev ◽  
Vener Y. Galin
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Lower Stratosphere ◽  
Middle Atmosphere ◽  
Southern Oscillation ◽  
Lower Troposphere ◽  
Reanalysis Data ◽  
Sea Surface ◽  
The Arctic ◽  
The Impact

The influence of sea-surface temperature (SST) on the lower troposphere and lower stratosphere temperature in the tropical, middle, and polar latitudes is studied for 1980–2019 based on the MERRA2, ERA5, and Met Office reanalysis data, and numerical modeling with a chemistry-climate model (CCM) of the lower and middle atmosphere. The variability of SST is analyzed according to Met Office and ERA5 data, while the variability of atmospheric temperature is investigated according to MERRA2 and ERA5 data. Analysis of sea surface temperature trends based on reanalysis data revealed that a significant positive SST trend of about 0.1 degrees per decade is observed over the globe. In the middle latitudes of the Northern Hemisphere, the trend (about 0.2 degrees per decade) is 2 times higher than the global average, and 5 times higher than in the Southern Hemisphere (about 0.04 degrees per decade). At polar latitudes, opposite SST trends are observed in the Arctic (positive) and Antarctic (negative). The impact of the El Niño Southern Oscillation phenomenon on the temperature of the lower and middle atmosphere in the middle and polar latitudes of the Northern and Southern Hemispheres is discussed. To assess the relative influence of SST, CO2, and other greenhouse gases’ variability on the temperature of the lower troposphere and lower stratosphere, numerical calculations with a CCM were performed for several scenarios of accounting for the SST and carbon dioxide variability. The results of numerical experiments with a CCM demonstrated that the influence of SST prevails in the troposphere, while for the stratosphere, an increase in the CO2 content plays the most important role.

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