Effect of meteorology on the variability of ozone in the troposphere and lower stratosphere over a tropical station Thumba (8.5°N, 76.9°E)

Chandran, P.R. Satheesh; Sunilkumar, S. V.; Muhsin, M.; Ramkumar, Geetha; Nair, Prabha R.

doi:10.1016/j.jastp.2021.105567

Cited by 7 publications

(3 citation statements)

References 73 publications

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“…Balloon‐borne sensors such as radiosondes and ECC ozonesondes are flown with meteorological balloons on‐board the ORV Sagar Kanya (cruise number—SK345) over the Arabian Sea and equatorial Indian Ocean from 16 January to 14 February 2018 during the ICARB field campaigns as part of Tropical Tropopause Dynamics (TTD) experiment under GPS Aided Radiosonde Network Experiments for Troposphere‐stratosphere Studies (GARNETS) program (Emmanuel et al., 2021; Muhsin et al., 2020; Satheesh Chandran et al., 2021; Sunilkumar et al., 2017). The cruise started from Mormugao port, Goa (15.38°N, 73.8°E) on 16 January 2018 and sailed toward the equatorial Indian Ocean along ∼75°E longitude.…”

Section: The Cruise Track General Meteorology and Experimentsmentioning

confidence: 99%

“…Occurrence of lightning during the study period is inferred from World Wide Lightning Location Network (WWLLN) global gridded lightning climatology (Kaplan & Lau, 2021). In addition to these, long‐term (10 years) ECC ozonesonde observations over Thumba (Satheesh Chandran et al., 2021) are also used to compare the upper tropospheric ozone values observed during the cruise.…”

Section: The Cruise Track General Meteorology and Experimentsmentioning

confidence: 99%

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Effect of Synoptic‐Scale Dynamics on the Vertical Distribution of Tropospheric Ozone Over the Arabian Sea and the Indian Ocean During the Boreal Winter of 2018

et al. 2022

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Ozone (O3) and relative humidity profiles obtained from in situ electrochemical concentration cell ozonesonde‐radiosonde observations over the Arabian Sea and the Indian Ocean from 16 January to 14 February 2018 during the Integrated Campaign for Aerosols gases and Radiation Budget cruise were analyzed. On the basis of the prevailing synoptic conditions during the cruise period, the cruise track was divided into three legs which were studied separately. The main objective of this study was to investigate the influence of prevailing synoptic scale dynamics and transport on the vertical distribution of ozone in the troposphere, especially in the tropical tropopause layer (TTL) region. Tropospheric ozone exhibits pronounced latitude variations over the Arabian Sea and the Indian Ocean with very high values (∼60–70 ppbv) above the marine boundary layer near the Indian landmass. Distinct ozone‐rich plume‐like structures are observed in the free troposphere around 1–3 and 4–5 km. At around 1–3 km, the ozone plume was maintained by the continental outflows from the Indian sub‐continent. The mid‐tropospheric (4–5 km) high ozone‐low water vapor layer is hypothesized to be associated with the equatorward return flow of the Hadley circulation. Enhanced (declined) ozone is observed below 12 km altitude in the descending (ascending) branch of Hadley circulation. The ozone distribution in the TTL shows distinct structures associated with the prevailing synoptic dynamics and transport during respective legs. Evidences of stratospheric intrusion and air mass transport from biomass burning locations are seen regarding upper tropospheric ozone enhancements.

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Section: The Cruise Track General Meteorology and Experimentsmentioning

confidence: 99%

Section: The Cruise Track General Meteorology and Experimentsmentioning

confidence: 99%

Effect of Synoptic‐Scale Dynamics on the Vertical Distribution of Tropospheric Ozone Over the Arabian Sea and the Indian Ocean During the Boreal Winter of 2018

et al. 2022

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“…Its concentration depends on photochemistry, physical/chemical removal and transport over local, regional, and global scales (Lal et al 2000 ). The long-range transport can influence the ozone and other pollutant concentration both in rural and urban environments (Satheesh Chandran et al 2021 ; Jain et al 2022 ). It is greatly influenced by predominant meteorological conditions (temperature, solar flux, wind speed and relative humidity).…”

Section: Introductionmentioning

confidence: 99%

Changes in tropospheric ozone concentration over Indo-Gangetic Plains: the role of meteorological parameters

Payra

Gupta

Sarkar

et al. 2022

Meteorol Atmos Phys

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This study seeks to understand and quantify the changes in tropospheric ozone (O 3 ) in lower troposphere (LT), middle troposphere (MT) and upper middle troposphere (UMT) over the Indo-Gangetic Plains (IGPs), India during the COVID-19 lockdown 2020 with that of pre-lockdown 2019. The gridded datasets of ozone from the European Centre for Medium-range Weather Forecasts (ECMWF) reanalysis product, ERA5 in combination with statistical interpolated (IDWs) surface NO 2 observations, present a consistent picture and indicate a significant tropospheric ozone enhancement over IGP during COVID-19 lockdown restrictions in May 2020. The Paper also examines the influencing role of meteorological parameters on increasing ozone concentration. Over LT, an increase in O 3 concentration (23%) is observed and in MT to UMT an enhancement of about 9–18% in O 3 concentration have been seen during May 2020 with respect to May 2019. An investigation on causes of increasing ozone concentration (35–85 ppbv) from MT to UMT during May 2020 reveals that there was significant rise (by 1–6%) in low cloud cover (LCC). Notably, higher LCC increases the backscattering of upward solar radiation from the top of the atmosphere. A positive difference of 5–25 W/m 2 in upward solar radiation (USR) is observed across the entire study region. The result suggests that higher LCC significantly contributed to the enhanced USR. Thereby, resulting in higher photolysis rate that lead to an increase in mid tropospheric ozone concentration during May 2020. The results highlight the importance of LCC as an important pathway in ozone formation and aid in scientific understanding of it.

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Role of deep convection and dynamics on the tracer distribution in the upper troposphere and lower stratosphere region during active and break phases of the Asian summer monsoon

Satheesh Chandran,

Sunilkumar

2023

Clim Dyn

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Effect of meteorology on the variability of ozone in the troposphere and lower stratosphere over a tropical station Thumba (8.5°N, 76.9°E)

Cited by 7 publications

References 73 publications

Effect of Synoptic‐Scale Dynamics on the Vertical Distribution of Tropospheric Ozone Over the Arabian Sea and the Indian Ocean During the Boreal Winter of 2018

Effect of Synoptic‐Scale Dynamics on the Vertical Distribution of Tropospheric Ozone Over the Arabian Sea and the Indian Ocean During the Boreal Winter of 2018

Changes in tropospheric ozone concentration over Indo-Gangetic Plains: the role of meteorological parameters

Role of deep convection and dynamics on the tracer distribution in the upper troposphere and lower stratosphere region during active and break phases of the Asian summer monsoon

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