Characterization of downwelling radiance measured from a ground-based  microwave radiometer using numerical weather prediction model data

Ahn, Myoung Hwan; Won, Hye Young; Han, D.; Kim, Y.-H.; Ha, Jong-Chul

doi:10.5194/amt-9-281-2016

Cited by 14 publications

(8 citation statements)

References 32 publications

(46 reference statements)

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“…Each wind profiler was collocated with a ground-based microwave radiometer that measures the downwelling radiance in the form of brightness temperature in the microwave region (Table 2), and it creates a vertical profile of humidity as well as air temperature. These radiometers operated by KMA were installed for nowcasting and for utilization by numerical weather prediction models to complement the wind profilers observations [26]. High temporal resolution data from radiometers can resolve the changing thermodynamic structure of transitioning boundaries, including fronts and gravity waves.…”

Section: Datamentioning

confidence: 99%

“…High temporal resolution data from radiometers can resolve the changing thermodynamic structure of transitioning boundaries, including fronts and gravity waves. A significant potential benefit of radiometers is that they can detect thermodynamic changes on very short time scales, on the order of approximately 10 min, which is far too short to be captured by radiosondes [26]. We used vertical thermodynamic information provided by radiometers and radiosondes to produce CAPE.…”

Section: Datamentioning

confidence: 99%

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Frontal Wind Field Retrieval Based on UHF Wind Profiler Radars and S-Band Radars Network

Kim

Campistron²,

Kwon

2019

Atmosphere

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The three-dimensional wind field (WPR3D) and the multiple WPR3D (M-WPR3D) associated with the passage of a stationary front was derived from observations made by a network of eight wind profiler radars (WPR) being operated by the Korea Meteorological Administration during the summer “Jangma” season. The effectiveness of the WPR3D was determined through numerical model analysis and wind profilers at three sites, and the accuracy of the M-WPR3D was validated by comparing the trajectory of the radiosonde. The discontinuity of the wind field near the frontal interface was clearly retrieved and the penetration of the air mass in the southern front was detected. Compared with either the wind vector of three single wind profiler or a local data assimilation and predication system, the WPR3D wind field showed a wind speed accuracy of approximately 70% at an altitude of 1.5 km and underestimated the wind speed by 0.5–1.5 m s−1. The M-WPR3D with three S-band Doppler radars successfully retrieved the backing wind field as well as the pre-Jangma-frontal jet. The results of this study showed that severe weather can be effectively analyzed using a three-dimensional wind field generated on the basis of a remote sensing network.

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Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Frontal Wind Field Retrieval Based on UHF Wind Profiler Radars and S-Band Radars Network

Kim

Campistron²,

Kwon

2019

Atmosphere

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“…Ground-based multichannel microwave radiometers (GMRs) can continuously observe atmospheric radiation brightness temperature (TB) in K-and V-bands, and provide valuable data on the temperature, water vapor, cloud liquid and humidity structures of the troposphere [1][2][3][4]. The microwave radiometer is a typical remote sensing device and provides very useful data for the detection of mesoscale phenomena that require high spatial and temporal capabilities (e.g., nowcasting convective activity and heavy rain events, boundary layer meteorology, clouds and assimilating GMR data into the WRF precipitation model) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Feasibility for Operationally Monitoring Ground-Based Multichannel Microwave Radiometer by Using Solar Observations

et al. 2021

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Ground-based multichannel microwave radiometers can observe the atmospheric microwave radiation brightness temperature and continuously provide temperature and humidity profiles of the troposphere. At present, microwave radiometers are operated in many countries for monitoring climate and meteorological phenomena, and there have been many microwave radiometers of this kind presently implemented in China, but they lack a unified monitor for their operational condition, which is necessary if they are taken as a network. For this reason, a real-time monitoring receiving system of radiometer is fundamental and important. In order to check the system stability and the antenna performances, this paper studied the feasibility of applying the solar signals to monitor the antenna alignment, antenna pattern and stability of a radiometer system in working for operational field applications. An experiment was performed and the results from the analysis of the annual variation features with long-term solar observation data at four frequencies, 22.235, 26.235, 30.000 and 51.250 GHz, show that an antenna pattern retrieved from solar observations agrees well with that retrieved from the traditional method. In addition, a daily analysis of the solar signals in online data of a radiometer can be used for monitoring the alignment of the antenna and the stability of the ground-based microwave radiometer system.

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“…10 km height through a neural network algorithm, it is based on the theory of atmospheric microwave thermal radiation and its transfer in the atmosphere, atmospheric radiation TB at some frequencies in Kand V-bands that derive from atmospheric water vapor, cloud liquid water and molecular oxygen emissions can be observed. At present, MWRs are mainly used to remotely sensing the atmospheric temperature and humidity profiles in the troposphere, many researchers have proved that an MWR can provide valuable data on the temperature and humidity structures of the troposphere (Cadeddu et al, 2013;Ahn et al, 2016;Laura et al, 2017). Furthermore, there are many other applications of MWRs, for example, nowcasting of heavy rain events using microwave radiometer has been carried out at Kolkata (Chakraborty et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Ground-based Multichannel Microwave Radiometer Antenna Pattern Measurement using Solar Observations

Lei

Wang

Jiang³

et al. 2020

Preprint

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Abstract. Ground-based multichannel microwave radiometers (MWRs) can provide continuous temperature and humidity profiles of the troposphere. MWR antenna pattern measurements are important for reliable and accurate antenna temperature measurement and are usually carried out in a microwave anechoic chamber. Measurement using an anechoic chamber is complex and expensive because the conventional measurement procedure requires a special situation and professional instruments. More importantly, the construction of the anechoic chamber and the installation method of the absorbing material can directly influence the performance of the anechoic chamber and the result of the antenna measurement. This paper proposes a new method of MWR antenna measurement by observing the sun, and this method can be used to measure other radar antenna patterns. During the measurement, the MWR observes the microwave radiation brightness temperature (TB) to measure the antenna pattern by high-resolution raster scanning of the azimuth and elevation of the sun under a clear sky in Xi'an, China. Analysis of the TB scanning data of the sun at four frequencies, 22.235, 26.235, 30.000 and 51.250 GHz, showed that the microwave radiation TB of the sun is strong enough to be observed by the MWR. Furthermore, the antenna pattern was illustrated and analyzed based on these data, which fully proves that the sun can be used to measure the antenna pattern. Finally, the antenna pattern derived from the solar observation was compared with the result of the far-field measurement with a point source in the microwave anechoic chamber at 30 GHz, the maximum error of the beamwidth is less than 0.1°, which showed that this pattern matched well to the pattern measurement using a point source in the microwave anechoic chamber. Therefore, the antenna pattern of the MWR can be measured by scanning the sun without a point source in the microwave anechoic chamber, and this method can be used for convenient MWR antenna measurements and can reduce the measurement complexity and cost.

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Characterization of downwelling radiance measured from a ground-based microwave radiometer using numerical weather prediction model data

Cited by 14 publications

References 32 publications

Frontal Wind Field Retrieval Based on UHF Wind Profiler Radars and S-Band Radars Network

Frontal Wind Field Retrieval Based on UHF Wind Profiler Radars and S-Band Radars Network

Feasibility for Operationally Monitoring Ground-Based Multichannel Microwave Radiometer by Using Solar Observations

Ground-based Multichannel Microwave Radiometer Antenna Pattern Measurement using Solar Observations

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