Middle-atmospheric water vapour profiles above the Zugspitze obtained with a new ground-based 22 GHz spectroradiometer

Golchert, S. H. W.; Hochschild, G.; Gros, Jochen

doi:10.1109/microrad.2010.5559570

Cited by 2 publications

(4 citation statements)

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“…The contribution to the line shape of the Doppler broadening depends linearly on the frequency of the observed transition, which determines how high the spectral altitude information reaches in the mesosphere. The highest range can be reached by the lowest frequencies Golchert (2009).…”

Section: Water Vapor Radiometry: Microwave Region and The Water Vapor...mentioning

confidence: 99%

“…Water vapor is also a valuable indicator of atmospheric motion due to its long chemical life Kämpfer et al (2003); Straub et al (2011); Tschanz et al (2013); Brasseur et al (1999) in the stratosphere and mesosphere Straub et al (2011); Tschanz et al (2013); Brasseur et al (1999). This allows studying stratosphere-troposphere exchange, as well as changes in global atmospheric circulation Golchert et al (2010). It is also involved in several chemical processes, one of which is ozone depletion Straub et al (2010);M üller et al (2008); Deuber et al (2005).…”

Section: Importance Of Water Vapormentioning

confidence: 99%

“…Doppler motion, which is the thermal motion of observed gases and results in frequency shifts that are imposed on the emission/absorption line. In thermodynamic equilibrium, the relative velocities of individual molecules with respect to the observer obey the Maxwell distribution Golchert (2009). On the other hand, pressure broadening which results from molecular collisions, and shorten the lifetime of excited states, and involve a detailed consideration of the internal degrees of freedom of the colliding molecules Hartmann et al (2021).…”

Section: Water Vapor Radiometry: Microwave Region and The Water Vapor...mentioning

confidence: 99%

“…The 22 GHz emission line exhibits a pronounced frequency shift that originates from collision-induced phase shifts in the radiation Golchert (2009). Near the center of a spectral line, the collisional width is governed by the mean time τ c between collisions affecting the phase of the radiating molecule and fits the Van Vleck-Weisskopf (VVW) line shape description Hill (1986), which is developed under the modified assumption that, post-collision, the probability distribution of the phase of the oscillating dipole is proportional to a Boltzmann factor in the interaction energy between the dipole and the instantaneous field.…”

Section: Water Vapor Radiometry: Microwave Region and The Water Vapor...mentioning

confidence: 99%

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A 22 GHz Pseudo-correlation Water Vapor Radiometer.

Reeves

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The radiation that comes from celestial objects is affected by different atmospheric components, mainly by water vapor, which is a highly variable component. This molecule can scatter, absorb and re-emit radiation and, therefore, attenuate it, affecting astronomical observations. Water vapor radiometry is an accurate method to measure the water vapor content in the atmosphere and, at altitudes 4000 masl, the 22 GHz emission line is chosen to estimate the amount of water vapor present in the at the time of the astronomical observation. This instrument, which is under development at CePIA UdeC laboratory, will provide a notable improvement in the measurement of the line profile of water vapor and will allow atmospheric characterizations that can be validated with other instruments in places where this quantity is relevant. The architecture designed for this project corresponds to a self-calibrated instrument, heterodine and is based on the pseudo-correlation principle. It consists of three parts: frontend, where incoming the RF signal is at a frequency range of 20 - 26 GHz; analog backend, where the RF signal is converted to a manageable frequency range of 0 - 6 GHz, called Intermediate Frequency (IF); and finally, the digital backend where the IF signal is processed in real-time through FFT, with a high spectral resolution of 62.5 kHz; the spectrum is divided intro three bands of 2 GHz each, in different Nyquist zones. Each output of the spectrometer is directly proportional to the brightness temperature of the load or the input, that provides a stable output measurement over time.

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Section: Water Vapor Radiometry: Microwave Region and The Water Vapor...mentioning

confidence: 99%

Section: Importance Of Water Vapormentioning

confidence: 99%

Section: Water Vapor Radiometry: Microwave Region and The Water Vapor...mentioning

confidence: 99%

Section: Water Vapor Radiometry: Microwave Region and The Water Vapor...mentioning

confidence: 99%

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A 22 GHz Pseudo-correlation Water Vapor Radiometer.

Reeves

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Influence of Solar Radiation on the Diurnal and Seasonal Variability of O3 and H2O in the Stratosphere and Lower Mesosphere, Based on Continuous Observations in the Tropics and the High Arctic

Palm

Golchert

Sinnhuber

et al. 2013

Climate and Weather of the Sun-Earth System (CAWSES)

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Middle-atmospheric water vapour profiles above the Zugspitze obtained with a new ground-based 22 GHz spectroradiometer

Cited by 2 publications

References 5 publications

A 22 GHz Pseudo-correlation Water Vapor Radiometer.

A 22 GHz Pseudo-correlation Water Vapor Radiometer.

Influence of Solar Radiation on the Diurnal and Seasonal Variability of O3 and H2O in the Stratosphere and Lower Mesosphere, Based on Continuous Observations in the Tropics and the High Arctic

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