Long-term changes in precipitable water vapour over India derived from satellite and reanalysis data for the past four decades (1980–2020)

Sarkar, Santu; Kuttippurath, J.; Patel, Vikas

doi:10.1039/d2ea00139j

Cited by 5 publications

(3 citation statements)

References 48 publications

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“…One of our future considerations will be the most comprehensive comparison of GPS moisture content data with the well-established ERA5 reanalysis data from ECMWF. The work [11] confirms that ERA5 PW complies with GPS measurements, with correlation coefficient range from 0.93 to 0.99, the BIAS between ERA5 PW and GPS PW ranged from 0.24 to 0.49 cm. This indicates that GPS observations can accurately capture the observed PW variability.…”

Section: Comparison Of Long-term Pw Trends Based On Rs Meteorology An...supporting

confidence: 81%

Changes in the total moisture content of the troposphere according to the data of GPS measurements and radiosondes

Dembelov,

Bashkuev

2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The levels of integrated water vapor (IWV) within the lower part of the atmosphere are obtained from the data of the global satellite navigation system (GPS) and radiosondes (RS). Long-term trends in the total moisture content of the troposphere were obtained at the observation points IRKM (Irkutsk) and YAKT (Yakutsk). Comparison of the trends with calculations by the Hopfield model, which takes into account surface weather data, showed a better agreement between GPS measurements than RS. There is an upward trend in IWV according to GPS observations over the entire period of the study, and, despite the large latitudinal differences in the observation points, there is a positive general trend of 0.31±0.02 mm per decade.

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Section: Comparison Of Long-term Pw Trends Based On Rs Meteorology An...supporting

confidence: 81%

Changes in the total moisture content of the troposphere according to the data of GPS measurements and radiosondes

Dembelov,

Bashkuev

2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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“…Taking into account the surface temperature and pressure, the PWV values can be estimated from these delays with a low uncertainty. Nowadays this method is widely used for this purpose, including evaluation of results obtained from the global atmospheric models mentioned above (e.g., [46][47][48][49][50][51][52][53][54][55][56][57]).…”

Section: Evaluation Of the Precipitable Water Vapor (Pwv) From The Gl...mentioning

confidence: 99%

Measurements and Evaluations of the Atmospheric Transparency at Short Millimeter Wavelengths at the Candidate Sites for Millimeter and Submillimeter Wave Telescopes

Zinchenko,

Lapinov,

Vdovin

et al. 2023

Preprint

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Radio astronomical observations at millimeter and submillimeter wavelengths are a very important tool of astrophysical research. However, there is a huge area in the northern Eurasia, including the whole Russian territory, which lacks sufficiently large radio telescopes effectively operating at these wavelengths. In this review we describe our long-term efforts to find suitable sites for such radio telescopes in this area, that is, sites with good atmospheric transparency at millimeter and submillimeter waves. We describe methods and instruments used for measurements and evaluations of the atmospheric opacity. They include special radiometric systems, which are used for estimations of the atmospheric opacity from the sky brightness measurements. Evaluation of the precipitable water vapor from such measurements by the artificial neural network is discussed. Alternative approaches use global atmospheric models and signals of the Global Navigation Satellite Systems. To date, a long-term radiometric monitoring has been performed at several candidate sites and atmospheric conditions for many sites have been evaluated using global atmospheric models. Several sites with the best atmospheric transparency at millimeter and submillimeter wavelengths have been selected. They can be effectively used for astronomical observations at least in the major atmospheric transparency windows at 1.3 mm and 0.85 mm. These results can be also used for space communications and radar systems.

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“…Most water vapor is present in the lower troposphere and plays a critical role during the precipitation process in the lower atmosphere as well as water circulation and climatic phenomena. Moreover, changes in the PW amount are also strongly associated with the global radiation balance, and they may affect the structure of atmospheric temperature and the characteristics of droughts and rainfall [4]. Furthermore, water vapor in the atmosphere provides the only major positive feedback for global warming [5][6][7], and it is predicted, based on both climate models and observations, that the amount of water vapor may tend to increase in response to the rise in the surface temperature [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Reproducing High Spatiotemporal Resolution Precipitable Water Distributions Using Numerical Prediction Data

Akatsuka

2023

Atmosphere

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Water vapor is an important greenhouse gas that affects regional climatic and weather processes. Atmospheric water vapor content is highly variable spatially and temporally, and continuous quantification over a wide area is problematic. However, existing methods for measuring precipitable water (PW) have advantages and disadvantages in terms of spatiotemporal resolution. This study uses high temporal resolution numerical prediction data and high spatial resolution elevation to reproduce PW distributions with high spatiotemporal resolution. This study also focuses on the threshold for elevation correction, improving temporal resolution, and reproducing PW distributions in near real time. Results show that using the water vapor content in intervals between the ground surface and 1000-hPa isobaric surface as the threshold value for elevation correction and generating hourly numerical prediction data using the Akima spline interpolation method enabled the reproduction of hourly PW distributions for 75% of the global navigation satellite system observation stations in the target region throughout the year with a root mean square error of 3 mm or less. These results suggest that using the mean value of monthly correction coefficients for the past years enables the reproduction of PW distributions in near real time following the acquisition of numerical prediction data.

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Long-term changes in precipitable water vapour over India derived from satellite and reanalysis data for the past four decades (1980–2020)

Abstract: India has tropical monsoon climate with significant regional variability in rainfall and temperature, where precipitation is closely connected to precipitable water vapour (PWV). Here, the satellite and reanalysis data are...

Cited by 5 publications

References 48 publications

Changes in the total moisture content of the troposphere according to the data of GPS measurements and radiosondes

Changes in the total moisture content of the troposphere according to the data of GPS measurements and radiosondes

Measurements and Evaluations of the Atmospheric Transparency at Short Millimeter Wavelengths at the Candidate Sites for Millimeter and Submillimeter Wave Telescopes

Reproducing High Spatiotemporal Resolution Precipitable Water Distributions Using Numerical Prediction Data

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