Ozone vertical distribution during the solar eclipse of 26 December 2019 over Gadanki: Role of background dynamics

Raj, S.T. Akhil; Ratnam, M. Venkat

doi:10.1016/j.apr.2021.101116

Cited by 5 publications

(4 citation statements)

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“…Post‐eclipse shows a significant downdraft of ∼−0.25 m s −1 between 12 and 16 km. Similar observations of updrafts and downdrafts were also reported over Gadanki (MST radar observations) for the same eclipse event by Raj and Ratnam (2021).…”

Section: Observational Resultssupporting

confidence: 86%

“…In addition, Cochin is closer to the eclipse shadow region as compared to Trivandrum and thus it is expected to have a different structure between the pre‐ and post‐eclipse scenario at these two locations. There is an ozone enhancement by 0.03–0.07 ppmv in the upper troposphere over Gadanki as reported by Raj and Ratnam (2021) for the same eclipse period. This enhancement is attributed to advection of ozone rich air from the western regions under the influence of subtropical jet.…”

Section: Observational Resultssupporting

confidence: 83%

“…Comparable thermal structures are also noticed over Trivandrum but the temperature inversion is weaker as compared to Cochin. Similar warmer tropopause of 3–5 K is also reported over Gadanki by Raj and Ratnam (2021) for the same eclipse. Earlier observations during the 15 January 2010 solar eclipse, which happened during the local noon hours, showed a similar feature but the temperature was much warmer by 4.6 K over Trivandrum (Subrahmanyam et al., 2011).…”

Section: Discussionsupporting

confidence: 86%

“…The downdrafts and updrafts in the vertical velocity measured by the CUSAT ST radar demonstrate this impact (Figure 10). Periodic updrafts and downdrafts were also observed over Gadanki using MST radar observations (Raj & Ratnam, 2021). Further, these downdrafts and updrafts adiabatically warm and cool the Earth's atmosphere, respectively, which is noticed in the thermal structure (Figure 7).…”

Section: Discussionmentioning

confidence: 93%

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Impact of Annular Solar Eclipse on the Trace Gases and Dynamics of the Lower and Middle Atmosphere: Results Inferred From an Integrated Campaign “Suryagrahan‐2019”

Das,

Kishore Kumar,

Subrahmanyam

et al. 2023

Earth and Space Science

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An integrated campaign “Suryagrahan‐2019” with multi‐institutional support was conducted by launching a series of radiosondes/ozonesondes over 6‐different locations in India along with the operation of ST/MST radars and launching of RH‐200 rockets during the annular solar eclipse of 26 December 2019. We present the eclipse‐induced changes in the thermal structure, dynamics and trace gases in the lower and middle atmosphere. One of the novel findings is the formation of three step‐like isothermal structures in the lower stratosphere with a layer height of 1.4, 2.5, and 4 km, which is attributed to the adiabatic compression and expansion of the air parcel. These structures have both warming and cooling effect of the order of ±6 K. A significant increase of ozone by 20% in post‐eclipse scenario between 29 and 32 km is observed over Cochin. Strong downdrafts of ∼−0.25 m s−1 are observed between 12 and 16 km during the eclipse event, which is attributed to the atmospheric compression due to the sudden cooling during the eclipse event. Due to the changes in thermal structure, the atmospheric circulation changes are observed in the meridional wind. During the maximum obscuration, there is a sudden decrease in near‐surface and boundary layer ozone by 12–15 ppbv. The present study reiterates that the eclipse‐induced perturbations depend on the local time of the eclipse event and place of observations. It is envisaged that the results discussed in the study will improve our understanding of the eclipse induced perturbations in the Earth's atmosphere.

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Section: Observational Resultssupporting

confidence: 86%

Section: Observational Resultssupporting

confidence: 83%