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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Long-term trends observed in the middle atmosphere temperatures using ground based LIDARs and satellite borne measurements
Annales Geophysicae, Volume 32, No. 3, Year 2014
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Description
Long-term data available from Lidar systems located at three different locations namely São José dos Campos, Brazil (23.2° S, 45.8° W), Gadanki (13.5° N, 79.2° E) and Reunion (20.8° S, 55.5° E) have been used to investigate the long-term variations like Annual, Semi-annual, Quasi-biennial, El Nino Southern Oscillation and solar cycle. These oscillations are also extracted from simultaneous satellite borne measurements of HALogen Occultation Experiment (HALOE) instrument onboard UARS and SABER onboard TIMED over these stations making largest time series covering the entire middle atmosphere. A good agreement is found between the LIDAR and satellite-derived amplitudes and phases between 30 and 65 km altitude, which suggests that satellite measurements can be used to investigate the long-term trends globally. Latter measurements are extended to 80 km in order to further investigate these oscillations. Large difference in the amplitudes between the eastern pacific and western pacific is noticed in these oscillations. Changing from cooling trends in the stratosphere to warming trends in the mesosphere occurs more or less at altitude around 70 km altitude and this result agrees well with that observed by satellite measurements reported in the literature. The peak in the cooling trend does not occur at a fixed altitude in the stratosphere however maximum warming trend is observed around 75 km at all the stations. The observed long-term trends including various oscillations are compared with that reported with various techniques. © Author(s) 2014. CC Attribution 3.0 License.
Authors & Co-Authors
Kishore, Pangaluru
United States, Irvine
University of California, Irvine
Venkat Ratnam, M.
India, Tirupati
National Atmospheric Research Laboratory
Velicogna, Isabella
United States, Irvine
University of California, Irvine
Sivakumar, Venkataraman
South Africa, Durban
University of Kwazulu-natal
Benchérif, Hassan
France, Saint-denis
Université de la Réunion
Clemesha, Barclay Robert
Brazil, Sao Jose Dos Campos
Instituto Nacional de Pesquisas Espaciais
Simonich, Dale Martin
Brazil, Sao Jose Dos Campos
Instituto Nacional de Pesquisas Espaciais
Batista, Paulo Prado
Brazil, Sao Jose Dos Campos
Instituto Nacional de Pesquisas Espaciais
Beig, Gufran
India, Pune
Indian Institute of Tropical Meteorology
Statistics
Citations: 14
Authors: 9
Affiliations: 6
Identifiers
Doi:
10.5194/angeo-32-301-2014
ISSN:
09927689
e-ISSN:
14320576
Study Approach
Quantitative