An Advanced Radiosonde System for Aerospace Applications

Divya, U. S.; Girija, J; Satyanarayana, S.; Zachariah, John

doi:10.1175/jtech-d-13-00050.1

Cited by 17 publications

(3 citation statements)

References 4 publications

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“…The root‐mean‐square (rms) error of radiosonde measurement by using ground‐based tracking radar is 1–2 m s −1 (Narayanan, ). The winds and temperature measured by the Dr.Pishroty GPS sonde compare well with other standard GPS sondes available globally (for details see Divya et al ()).…”

Section: Observational Techniques Over Thumbasupporting

confidence: 59%

Four‐decadal climatological intercomparison of rocketsonde and radiosonde with different reanalysis data: results from Thumba Equatorial Station

Das

Uma

Bineesha

et al. 2015

Quart J Royal Meteoro Soc

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Four decades of climatological data on winds from 0 to 65 km measured over the Thumba Equatorial Rocket Launching Station (TERLS) (8.53°N, 76.87°E), a low‐latitude equatorial station in India, are compared with four global reanalysis datasets. The observations are made using balloon‐borne experiments (0–35 km) and rocket soundings (20–65 km) from 1970 to 2013. Reanalysis data compared well with the real‐time observations below the tropopause and less well above it in both the wind components (zonal and meridional). The average correlation coefficient between observations and reanalysis is found to be 0.9 for zonal wind from the surface to 30 km and 0.6 for meridional wind from the surface to 15 km. The amplitude of the semi‐annual oscillation (SAO), annual oscillation (AO), and Quasi‐Biennial Oscillation (QBO) are reproduced well in the four reanalysis datasets. The QBO amplitude maximum around 20–30 km altitude is systematically underestimated by all the reanalyses compared to the observations.

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Section: Observational Techniques Over Thumbasupporting

confidence: 59%

Four‐decadal climatological intercomparison of rocketsonde and radiosonde with different reanalysis data: results from Thumba Equatorial Station

Das

Uma

Bineesha

et al. 2015

Quart J Royal Meteoro Soc

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“…These radiosonde launches were conducted in collaboration with Space Physics Laboratory (SPL), Vikram Sarabhai Space Centre, Indian Space Research Organization (ISRO). The accuracy of temperature, relative humidity and wind speed measured by this radiosonde is ±0.5°C, ±5% and better than 1 m/s, respectively (Divya et al, 2014). To minimize the random errors due to balloon oscillations, the raw data has undergone strict quality checks.…”

Section: Methodology and Data Analysismentioning

confidence: 98%

Validation of Wind Measurements From a 53 MHz ST Radar Pilot Array Located at University of Calcutta With Collocated Radiosonde Launches

et al. 2022

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A Stratosphere‐Troposphere (ST) Radar operating at 53 MHz is being installed at Ionosphere Field Station (22.94°N, 88.51°E, and 34°N geomagnetic latitude) of University of Calcutta in the eastern part of India adjoining northern Bay of Bengal. This radar is unique, being the only one operational at this frequency in the entire eastern and northeastern part of the country and also in the south‐east Asian longitude sector. Two components of horizontal winds (zonal and meridional) measured by the Pilot version of this radar have been validated with 90 collocated simultaneous balloon‐borne radiosonde observations during July and August 2019. A good correlation of the order of 90%–99% and 75%–95% up to 8 km has been observed between the radar and radiosonde measured zonal winds and meridional winds respectively. This correlation is much stronger between 2 and 6 km altitudes. The correspondence is better for the zonal winds than meridional. However, there have been some data outliers, which may primarily be attributed to different measurement techniques, large beam width of the Pilot array and less antenna aperture. The differences between radar and radiosonde measurements are marginally higher for precipitation events compared to non‐precipitation cases. The zonal and meridional wind patterns exhibit different variations in July and August 2019 while the standard errors in zonal and meridional winds mostly lie within 1 m/s. These results are the first validation of the Pilot version of this radar facility.

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“…All these radiosondes have an accuracy of better than 2 ms −1 in wind velocity and 5% in relative humidity measurements. Details validation of these radiosonde can be found elsewhere (S. K. Das et al., 2021; Dirksen et al., 2014; Divya et al., 2014; Hurst et al., 2011; Ratnam et al., 2014; Sunilkumar et al., 2015).…”

Section: Campaign Detailsmentioning

confidence: 99%

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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An Advanced Radiosonde System for Aerospace Applications

Cited by 17 publications

References 4 publications

Four‐decadal climatological intercomparison of rocketsonde and radiosonde with different reanalysis data: results from Thumba Equatorial Station

Four‐decadal climatological intercomparison of rocketsonde and radiosonde with different reanalysis data: results from Thumba Equatorial Station

Validation of Wind Measurements From a 53 MHz ST Radar Pilot Array Located at University of Calcutta With Collocated Radiosonde Launches

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”

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