Indications of Atmospheric Ozone Decrease in Solar UV-B Flux Changes During the Total Solar Eclipse of 24 October 1995

Kandula, Niranjan; Thulasiraman, S.; Reddy, Y. S.

doi:10.3319/tao.1997.8.2.239(asee)

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Dolas et al (2002) reported changes in wind speed during the eclipse with minimum value during totality but without much change in wind direction. Niranjan et al (1997) observed sharp increases in the UV flux after the last two hours of contact of the eclipse on 24 October, 1995. These authors attributed the observed increases in groundbased UV flux to the reduction of stratospheric ozone.…”

Section: Introductionmentioning

confidence: 88%

Temperature perturbations in the troposphere-stratosphere over Thumba (8.5° N, 76.9° E) during the solar eclipse 2009/2010

et al. 2011

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Abstract. Measurements of atmospheric temperature profiles in the troposphere and lower stratosphere were made over Thumba Equatorial Rocket Launching Station (TERLS) (8.5 • N, 76.9 • E) during a partial solar eclipse (22 July 2009) and an annular solar eclipse (15 January 2010). It was observed that during the partial solar eclipse, the temperature decreased by 2-3 • C in the vicinity of the tropopause and in the lower stratosphere the temperature increased by ∼2.6 • C during the maximum phase of the partial solar eclipse. During the annular solar eclipse, a temperature reduction of ∼2 • C was observed around the tropopause. This study also revealed a feature of delayed effect in the form of a very intense warming of ∼8 • C at 18 km after about 4 h of the annular solar eclipse. The Cold-Point Tropopause (CPT) temperature increased slowly before the beginning of the eclipse (up to 10:00 IST) and during the maximum phase of the eclipse, the difference in CPT temperature and height was −3.5 • C and ∼110 m, respectively, as that of the control day. After the four hours of the eclipse, the CPT height had decreased by ∼1.7 km and the CPT temperature increased by ∼4.6 • C. This is for the first time that the diurnal variation of the tropopause has been reported during a solar eclipse day. The present study, thus, provided an opportunity to investigate the temperature perturbations in the troposphere and lower stratosphere during a partial and annular solar eclipse. The highlight of the present results are (1) cooling of the entire troposphere and lower stratosphere during the maximum phase of annular solar eclipse, (2) an intense heating of the lower stratosphere by 8 • C after nearly four hours from the maximum phase of the annular eclipse, and (3) drastic variations in the diurnal evolution of the tropical tropopause characteristics. The cooling effect is attributed to the radiative response of the atmosphere to the solar eclipse, where as heatCorrespondence to: K. V. Subrahmanyam (kvsm2k@gmail.com) ing is attributed to the dynamical response of the atmosphere to the solar eclipse. These results may have important implications in understanding the response of the atmosphere to the radiative, as well as dynamical, perturbations caused by any celestial or terrestrial disturbances.

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Section: Introductionmentioning

confidence: 88%

Temperature perturbations in the troposphere-stratosphere over Thumba (8.5° N, 76.9° E) during the solar eclipse 2009/2010

et al. 2011

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“…It may be observed from these figures that the aerosol optical depth decreased from 07:30 hours onwards followed by a gradual increase from 08:10 hours to 09:30 hours and from 09:30 hours onwards it decreased till the end of the eclipse. The post eclipse total optical depths for the remaining period of the day did not show any significant variation in their value (Niranjan et al, 1997a). The aerosol optical depths evaluated for the control day also show no significant variation with time.…”

Section: Resultsmentioning

confidence: 75%

Aerosol Optical Depth and Size Distribution Changes During the Total Solar Eclipse of 24 October 1995

Niranjan¹,

Thulasiraman²

1998

Terr. Atmos. Ocean. Sci.

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This paper reports the results obtained from a study of the changes in aerosol spectral optical depths and size distribution during the total solar eclipse of 24 October 1997. These results were obtained from the measure ments of ground reaching multispectral direct solar flux in the visible and near IR wavelengths using a Multi-Wavelength Solar Radiometer (MWR).During the maximum phase of the solar eclipse an increase in the aerosol optical depths has been observed at different wavelengths. The aerosol size distribution became modified into a monomodal distribution during the eclipse phase as compared to a regular bi-modal distribution. The observed changes are attributed •to the changes in the surface meteorology due to the reduction in temperature and increase in humidity during the eclipse pe riod.

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“…The turbidity increases during summer and decreases in monsoon and winter seasons. Niranjan et al (1997) reported that β is maximum in May and minimum in September for this station. This may account for the large variations in correlation coefficients during monsoon for this station.…”

Section: Variation Of Uv-b Irradiance As a Function Of Solar Zenith Amentioning

confidence: 99%

Solar UV-B Irradiance at a Tropical Indian Station,Visakhapatnam (17.70°North, 83.30°East) - a Relation with TOMS Ozone

Prasad¹,

Kandula²

2005

Terr. Atmos. Ocean. Sci.

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Indications of Atmospheric Ozone Decrease in Solar UV-B Flux Changes During the Total Solar Eclipse of 24 October 1995

Cited by 7 publications

References 6 publications

Temperature perturbations in the troposphere-stratosphere over Thumba (8.5° N, 76.9° E) during the solar eclipse 2009/2010

Temperature perturbations in the troposphere-stratosphere over Thumba (8.5° N, 76.9° E) during the solar eclipse 2009/2010

Aerosol Optical Depth and Size Distribution Changes During the Total Solar Eclipse of 24 October 1995

Solar UV-B Irradiance at a Tropical Indian Station,Visakhapatnam (17.70°North, 83.30°East) - a Relation with TOMS Ozone

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