During a total solar eclipse (TSE) on 22 July 2009, atmospheric perturbations were monitored from the surface to thermosphere to understand TSE’s impact on the meteorological (temperature, relative humidity, wind speed, and wind direction) and chemical (O3 and NOx) parameters around Kadapa (14.28°N, 78.42°E), a tropical semi-arid region of India. For this purpose, an experiment was conducted at Yogi Vemana University Campus, Kadapa, India, to measure the temperature, wind speed, wind direction, and concentrations of ozone (O3), NO, NO2, and NOx by using the automatic weather station (AWS) and O3 analyzer. On the eclipse day (22 July 2009), the surface observations at Kadapa showed a reduction in temperature (about 1.1°C) because of the solar insulation. Comparison of the thermal, dynamical (wind), and chemical parameters on the TSE day with control days [preceding (21 July 2009) and succeeding (23 July 2009) the TSE] illustrated the influence of solar eclipse. During the eclipse period, the O3 mixing ratio decreased, while NO2 and NOx increased; however, NO remained unchanged. In addition, radio occultation (RO) temperature profiles from Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC)/Formosat Satellite Mission (FORMOSAT-3) and Thermosphere, Ionosphere, and Mesosphere Energetics and Dynamics (TIMED) satellites were utilized to understand the impact of TSE on dynamics of the middle and upper atmosphere from tropopause to the thermosphere. High vertical resolution COSMIC observations revealed that during the solar eclipse, tropopause was cooler with twin peaks (double tropopause). The lower thermosphere between 110 and 130 km became warmer during the TSE, which might be caused by the dynamical response of the atmosphere in this region to the solar eclipse. The experimental data have provided very fine-scale variations of the atmospheric parameters both in time and height and also constituted a new set of results on TSE for further research.
total solar eclipse (TSE) atmospheric perturbations tropopause dynamics COSMIC/FORMOSAT-3 satellite radio occultation (RO) observations
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We sincerely acknowledge the Indian Space Research Organization (ISRO), Bangaluru for sponsoring the Semi-arid-zone Atmopsheric Research Centre (SARC) at Yogi Vemana University, Kadapa to carry out this study. COSMIC data are obtained from the website https://cdaac-www.cosmic.ucar.edu/cdaac/login/cosmic/level2/wetPrf/ and authors are very much thankful to all members of CDAAC team for providing the COSMIC data freely. The authors acknowledge efforts of the TIMED/SABER team for free access to the data. Mr. S. B. Surendra Prasad and Mr. M. Venkatarami Reddy greatly acknowledge ISRO, Govt. of India for providing the financial support through research fellowships to carry out this study.
Dhaka, S. K., V. Kumar, R. K. Choudhary, et al., 2015: Indications of a strong dynamical coupling between the polar and tropical regions during the sudden stratospheric warming event January 2009, based on COSMIC/FORMOSAT-3 satellite temperature data. Atmos. Res., 666, 60–69, doi: https://doi.org/10.1016/j.atmosres.2015.06.008.CrossRefGoogle Scholar
Dutta, G., M. N. Joshi, N. Pandarinath, et al., 1999: Wind and temperature over Hyderabad during the solar eclipse of 24 Oct. 1995. Indian J. Radio Space Phys., 28, 11–14.Google Scholar
Espenak, F., and J. Anderson, 2008: Total solar eclipse of 2009 July 22. NASA/TP—2008-214169, National Aeronautics and Space Administration, Goddard Space Flight Center, Maryland, USA, 1–4.Google Scholar
Ho, S.-P., G. Kirchengast, S. Leroy, et al., 2009: Estimating the uncertainty of using GPS radio occultation data for climate monitoring: Intercomparison of CHAMP refractivity climate records from 2002 to 2006 from different data centers. J. Geophys. Res. Atmos., 144, D23107, doi: https://doi.org/10.1029/2009JD011969.CrossRefGoogle Scholar
Ho, S.-P., Y.-H. Kuo, W. Schreiner, et al., 2010b: Using Si-traceable global positioning system radio occultation measurements for climate monitoring [in “State of the Climate in 2009]. Bull. Amer. Meteor. Soc., 91, S36–S37.Google Scholar
Krishnan, P., P. K. Kunhikrishnan, S. M. Nair, et al., 2004: Observations of the atmospheric surface layer parameters over a semi arid region during the solar eclipse of August 11th, 1999. J. Earth Syst. Sci., 113, 353–363, doi: https://doi.org/10.1007/BF02716730.CrossRefGoogle Scholar
Maurya, A. K., D. V. Phanikumar, R. Singh, et al., 2014: Low-mid latitude D region ionospheric perturbations associated with 22 July 2009 total solar eclipse: Wave-like signatures inferred from VLF observations. J. Geophys. Res. Space Phys., 119, 8512–8523, doi: https://doi.org/10.1002/2013JA019521.CrossRefGoogle Scholar
Ratnam, M. V., G. Basha, M. Roja Raman, et al., 2011: Unusual enhancement in temperature and ozone vertical distribution in the lower stratosphere observed over Gadanki, India, following the 15 January 2010 annular eclipse. Geophys. Res. Lett., 38, L02803, doi: https://doi.org/10.1029/2010GL045903.CrossRefGoogle Scholar
Remsberg, E. E., B. T. Marshall, M. Garcia-Comas, et al., 2008: Assessment of the quality of the version 1.07 temperature-versus-pressure profiles of the middle atmosphere from TIMED/SABER. J. Geophys. Res. Atmos., 113, D17101, doi: https://doi.org/10.1029/2008JD010013.CrossRefGoogle Scholar
Russell, J. M., M. G. Mlynczak, L. L. Gordley, et al., 1999: Overview of the SABER experiment and preliminary calibration results. Proceedings of SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, SPIE, Denver, CO, USA, 277–288, doi: https://doi.org/10.1117/12.366382.Google Scholar
Tzanis, C., C. Varotsos, and L. Viras, 2008: Impacts of the solar eclipse of 29 March 2006 on the surface ozone concentration, the solar ultraviolet radiation and the meteorological parameters at Athens, Greece. Atmos. Chem. Phys., 8, 425–430, doi: https://doi.org/10.5194/acp-8-425-2008.CrossRefGoogle Scholar