Unusual enhancement in temperature and ozone vertical distribution in the lower stratosphere observed over Gadanki, India, following the 15 January 2010 annular eclipse

Ratnam, M. Venkat; Basha, Ghouse; Raman, M. Roja; Mehta, Sanjay Kumar; Murthy, B. V. Krishna; Jayaraman, A.

doi:10.1029/2010gl045903

Cited by 16 publications

(11 citation statements)

References 9 publications

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“…To date, there have been no comprehensive detailed observations or analysis of mesospheric O 3 during solar eclipses. Most previous studies have focused on the vertical O 3 distribution in the stratosphere [ Ratnam et al ., ; Kumar et al ., ; Manchanda et al ., ] or total column O 3 [ Chakrabarty et al ., ; Zerefos et al ., ; Chudzynski et al ., ; Tzanis , ]. Only a few observations of mesospheric O 3 during solar eclipses have been reported [e.g., Randhawa , ; Agashe and Rathi , ; Connor et al ., ; Kulikov et al ., ], but they were not robust, and little theoretical analysis of the data was performed.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the ratio of molecular photolysis rates during the eclipse to those before or after the eclipse is almost independent of the effective wavelength for photolysis. It is, therefore, expected that O 3 measurements during the eclipse may provide unique information on O 3 photochemistry in the mesosphere where clear diurnal O 3 variations have been recognized [Ricaud et al, 1996 [Ratnam et al, 2011;Kumar et al, 2011;Manchanda et al, 2012] or total column O 3 [Chakrabarty et al, 1997;Zerefos et al, 2000;Chudzynski et al, 2001;Tzanis, 2005]. Only a few observations of mesospheric O 3 during solar eclipses have been reported [e.g., Randhawa, 1968;Agashe and Rathi, 1982;Connor et al, 1994;Kulikov et al, 2008], but they were not robust, and little theoretical analysis of the data was performed.…”

Section: Introductionmentioning

confidence: 99%

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SMILES observations of mesospheric ozone during the solar eclipse

Imai

Igarashi

Takahashi

et al. 2015

Geophysical Research Letters

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The Superconducting Submillimeter‐Wave Limb‐Emission Sounder (SMILES) successfully observed vertical distributions of ozone (O3) concentration in the middle atmosphere during the annular solar eclipse that occurred on 15 January 2010. In the mesosphere, where the photochemical lifetime of O3 is relatively short (approximately 100 s), altitude‐dependent changes in O3 concentration under reduced solar radiation and their temporal variations were clearly observed as a function of the eclipse obscuration. This study reports the vertical distributions of mesospheric O3 during a solar eclipse event and analyzes theoretically the eclipse‐induced changes. We show that simple analytical expressions for O3 concentration, which assume that O3 and O are in a photochemically steady state, can be used to describe the O3 concentration under reduced solar radiation. The SMILES data obtained during the eclipse provide a unique opportunity to test our current understanding of mesospheric O3 photochemistry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SMILES observations of mesospheric ozone during the solar eclipse

Imai

Igarashi

Takahashi

et al. 2015

Geophysical Research Letters

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“…Regular launching of ozonesonde every fortnight from National atmospheric Research Laboratory (NARL), Gadanki (13.5 • N, 79.2 • E), has been conducted from 2011 onwards (Akhil Raj et al, 2015), and a special campaign (consisting of seven launchings) was conducted during the 2010 annular eclipse (Ratnam et al, 2011). A very good comparison between Gadanki ozonesonde and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), Microwave Limb Sounder (MLS), and ERA-Interim has been found above 20 km altitude (Akhil Raj et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Long-term trends in stratospheric ozone, temperature, and water vapor over the Indian region

et al. 2018

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Abstract. We have investigated the long-term trends in and variabilities of stratospheric ozone, water vapor and temperature over the Indian monsoon region using the long-term data constructed from multi-satellite (Upper Atmosphere Research Satellite (UARS MLS and HALOE, 1993-2005), Aura Microwave Limb Sounder (MLS, 2004(MLS, -2015, Sounding of the Atmosphere using Broadband Emission Radiometry (SABER, 2002(SABER, -2015 on board TIMED (Thermosphere Ionosphere Mesosphere Energetics Dynamics)) observations covering the period 1993-2015. We have selected two locations, namely, Trivandrum (8.4 • N, 76.9 • E) and New Delhi (28 • N, 77 • E), covering northern and southern parts of the Indian region. We also used observations from another station, Gadanki (13.5 • N, 79.2 • E), for comparison. A decreasing trend in ozone associated with NO x chemistry in the tropical middle stratosphere is found, and the trend turned to positive in the upper stratosphere. Temperature shows a cooling trend in the stratosphere, with a maximum around 37 km over Trivandrum (−1.71 ± 0.49 K decade −1 ) and New Delhi (−1.15 ± 0.55 K decade −1 ). The observed cooling trend in the stratosphere over Trivandrum and New Delhi is consistent with Gadanki lidar observations during 1998-2011. The water vapor shows a decreasing trend in the lower stratosphere and an increasing trend in the middle and upper stratosphere. A good correlation between N 2 O and O 3 is found in the middle stratosphere (∼ 10 hPa) and poor correlation in the lower stratosphere. There is not much regional difference in the water vapor and temperature trends. However, upper stratospheric ozone trends over Trivandrum and New Delhi are different. The trend analysis carried out by varying the initial year has shown significant changes in the estimated trend.

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“…The warming was attributed to thermal contraction of the atmosphere, which induces downward movement in the upper troposphere and lower stratosphere and subsequent adiabatic heating. Ratnam et al (2011) also showed warming around 21 km over Gadanki along with enhancement in ozone partial pressure. In the present study also, one should expect the eclipse induced downward motion.…”

Section: Resultsmentioning

confidence: 91%

“…Significant reduction in the total ozone as measured by Brewer spectro-radiometers during the course of solar eclipses has also been reported (Zerefos et al, 2000;Kazadzis et al, 2007). Very recently, Ratnam et al (2011) reported the changes observed in temperature and ozone concentration in the lower stratosphere over Gadanki (13.48 • N,79.18 • E) associated with the annular eclipse of 15 January 2010. These authors observed unusual enhancements in temperature and ozone around 21 km just after the eclipse and these enhancements were attributed to large subsidence and horizontal advection.…”

Section: Introductionmentioning

confidence: 79%

New insights into the stratospheric and mesosphere-lower thermospheric ozone response to the abrupt changes in solar forcing

Kumar¹,

Subrahmanyam

John³

2011

Ann. Geophys.

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Using a unique set of satellite based observations of the vertical distribution of ozone during the recent annular solar eclipse of 15 January 2010, we demonstrate for the first time, a complete picture of the response of stratospheric ozone to abrupt changes in solar forcing. The stratospheric ozone decreased after the maximum obscuration of the Sun and then gradually increased with time. A dramatic increase in stratospheric ozone of up to 4 ppmv is observed 3 h after the maximum obscuration of the Sun. The present study also reports for the first time the mesosphere-lower thermospheric ozone response to solar eclipse. Thus it is envisaged that the present results will have important implications in understanding the ozone response to abrupt changes in solar forcing and time-scales involved in such response

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Unusual enhancement in temperature and ozone vertical distribution in the lower stratosphere observed over Gadanki, India, following the 15 January 2010 annular eclipse

Cited by 16 publications

References 9 publications

SMILES observations of mesospheric ozone during the solar eclipse

SMILES observations of mesospheric ozone during the solar eclipse

Long-term trends in stratospheric ozone, temperature, and water vapor over the Indian region

New insights into the stratospheric and mesosphere-lower thermospheric ozone response to the abrupt changes in solar forcing

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