On the high percentage of occurrence of type-B 150-km echoes during the year 2019 and its relationship with mesospheric semi-diurnal tide and stratospheric ozone

Dutta, Reetambhara; Sridharan, S.; Meenakshi, S.; Ojha, Sayantani; Hozumi, Kornyanat; Yatini, Clara Y.

doi:10.1016/j.asr.2021.08.031

Cited by 2 publications

(1 citation statement)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, 2013 is considered as a major event, and 2019 as a minor one, as per the types of SSW defined by WMO. The dates of the SSW onset days are similar as mentioned in the previous studies (Coy & Pawson, 2015; Dutta et al., 2022; Liu et al., 2022). In the antipodal stratosphere, latitudinal temperature difference is observed to decrease gradually and the stratospheric cooling is greater in magnitude for the 2019 SSW, compared to the 2013 event.…”

Section: Discussionsupporting

confidence: 84%

Signature of Sudden Stratospheric Warming in the Pole and Its Antipode

Dutta,

Sridharan,

Sinha

2024

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

In this study, the boreal sudden stratospheric warming (SSW) event of 2013 and the austral SSW event of 2019 are considered to investigate the influence of the SSW events on the polar and antipodal upper mesosphere and lower thermosphere (UMLT) regions using ground‐based, space‐borne, reanalysis and model data sets. During the SSW events, the solar semi‐diurnal tidal (SDT) amplitudes are much larger than the lunar amplitudes in both UMLT regions. Besides, the solar SDT shows an increase in its amplitude in both the polar UMLT heights during the SSW events. However, the lunar tides show enhancement in its amplitude in the boreal polar UMLT region during both the SSW events. In the antipodal UMLT region, a peak enhancement in solar SDT amplitude is observed a few days after the onset of the boreal SSW and near to the onset time of the austral SSW. No concurrent stratospheric ozone volume mixing ratio (vmr) increase is observed which indicates that the SDT peak can be unlikely due to the underlying stratospheric ozone vmr changes. However, similar periodicity in the UMLT zonal winds of both poles indicates the possibility of cross equatorial propagation of planetary wave (PW). As the SDT amplitude also reveal similar planetary wave periodicity as observed in zonal wind, it is suggested that the PW modulation of the SDT could be the reason for the enhancement of SDT in the opposite polar UMLT region.

show abstract

Section: Discussionsupporting

confidence: 84%

Signature of Sudden Stratospheric Warming in the Pole and Its Antipode

Dutta,

Sridharan,

Sinha

2024

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

show abstract

Multi-instrumental analysis of ozone vertical profiles and total columns in South America: comparison between subtropical and equatorial latitudes

Bittencourt,

Bencherif,

Pinheiro

et al. 2024

Atmos. Meas. Tech.

View full text Add to dashboard Cite

Abstract. The behavior of ozone gas (O3) in the atmosphere varies according to the region of the globe. Its formation occurs mainly in the tropical stratosphere through the photodissociation of molecular oxygen with the aid of the incidence of ultraviolet solar radiation. Still, the highest concentrations of O3 content are found in high-latitude regions (poles) due to the Brewer–Dobson circulation, a large-scale circulation that takes place from the tropics to the pole in the winter hemisphere. This work presents a multi-instrumental analysis at two Brazilian sites, a subtropical one (Santa Maria – 29.72° S, 53.41° W) and an equatorial one (Natal – 5.4° S, 35.4° W), to investigate ozone distributions in terms of vertical profiles (2002–2020) and total abundance in terms of total columns of ozone (1979–2020). The study is based on the use of ground-based and satellite observations. Ozone profiles over Natal, from the ground up to the mesosphere, are obtained by radiosonde experiments (0–30 km) in the framework of the SHADOZ program and by satellite measurements from the SABER instrument (15–60 km). This enabled the construction of a continuous time series for ozone, including monthly values and climatological trends. There is a good agreement between the two measurements in the common observation layer, mainly for altitudes above 20 km. Below 20 km, SABER ozone profiles showed high variability and overestimated ozone mixing ratios by over 50 %. Dynamic and photochemical effects can interfere with O3 formation and distribution along higher latitudes through the Brewer–Dobson circulation. The measurements of the total ozone columns used are in good agreement with each other (TOMS/OMI × Dobson for Natal and TOMS/OMI × Brewer for Santa Maria) in time and space, in line with previous studies for these latitudes. Wavelet analysis was used over 42 years. The investigation revealed a significant annual cycle in both data series for both sites. The study highlighted that the quasi-biennial oscillation (QBO) plays a significant role in the variability of stratospheric ozone at the two study sites – Natal and Santa Maria. The QBO's contribution was found to be stronger at the Equator (Natal) than at the subtropics (Santa Maria). Additionally, the study showed that the 11-year solar cycle also has a significant impact on ozone variability at both locations. Given the study latitudes, the ozone variations observed at the two sites showed different patterns and amounts. Only a limited number of studies have been conducted on stratospheric ozone in South America, particularly in the region between the Equator and the subtropics. The primary aim of this work is to investigate the behavior of stratospheric ozone at various altitudes and latitudes using ground-based and satellite measurements in terms of vertical profiles and total columns of ozone.

show abstract

On the high percentage of occurrence of type-B 150-km echoes during the year 2019 and its relationship with mesospheric semi-diurnal tide and stratospheric ozone

Cited by 2 publications

References 55 publications

Signature of Sudden Stratospheric Warming in the Pole and Its Antipode

Signature of Sudden Stratospheric Warming in the Pole and Its Antipode

Multi-instrumental analysis of ozone vertical profiles and total columns in South America: comparison between subtropical and equatorial latitudes

Contact Info

Product

Resources

About