History of Radar Meteorology in Japan

Kodaira, N.; Aoyagi, Jiro

doi:10.1007/978-1-935704-15-7_9

Cited by 21 publications

(4 citation statements)

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“…This kind of behavior is manifested by the fairly systematic variation of the coefficient A and exponent b in the radar reflectivity‐rain rate relationship Z = AR b , as shown by AAL (their Figure 9) where A decreases and b increases from C to S to T rainfall. A similar variation is also suggested less dramatically in the early work of Fujiwara [1965] (shown better by Kodaira and Aoyagi [1990]).…”

Section: Observationssupporting

confidence: 61%

Drop size spectra and integral remote sensing parameters in the transition from convective to stratiform rain

Atlas

Ulbrich

2006

Geophysical Research Letters

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[1] Several authors have reported the correlation between the shape (m) and slope (L) of the gamma distribution of raindrops to reduce the number of parameters required to measure rainfall by remote sensing methods. However, we find that there are no well-defined m-L, or associated relations between reflectivity (Z) and rain rate (R) or differential reflectivity for all storms or portions thereof. Rather, there is a general behavior such that A and b (in the Z = AR b relation) and median volume drop diameter D o all decrease from convective (C) to stratiform (S) to transition (T) rains. The m-L correlation of the investigators in question appears to be limited to rainfall events which do not include convective rain; it is biased toward S and T rains. They miss the narrow (large m), large D o DSDs of convective rain that are often found to have equilibrium spectra. The dependence of D o on the strength of the updraft and the findings of others concerning the association with the physics, dynamics, and climate regime strongly suggests that it is necessary to characterize the physical and dynamic nature of the storms in order to select the appropriate remote sensing algorithms. Citation: Atlas, D., and C. Ulbrich (2006), Drop size spectra and integral remote sensing parameters in the transition from convective to stratiform rain, Geophys. Res. Lett., 33, L16803,

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Section: Observationssupporting

confidence: 61%

Drop size spectra and integral remote sensing parameters in the transition from convective to stratiform rain

Atlas

Ulbrich

2006

Geophysical Research Letters

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“…A weather radar committee was established in 1950 to promote that it could be compared with the standard C-band radar (Kodaira, and Aoyagi, 1990). Over the period 1950-1970, several studies measured rainfall amounts using different radar systems.…”

Section: The Challenge Of Radar-based Quantitative Precipitation Estimentioning

confidence: 99%

Quantitative Precipitation Estimation and Hydrological Modeling in Japan

Shakti

2017

J. Japan Soc. Hydrol. and Water Resour.

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“…Their capabilities are also crucial for weather prediction. Conventional weather radars have typically operated at S-or C-band frequencies with observation ranges of hundreds of kilometers [1], [2], but the use of X-band weather radars with coverages of tens or 100 km has been growing. The coverage area of an S-or C-band radar can be filled by deploying multiple X-band weather radars in a so-called X-band weather radar network [3].…”

Section: Introductionmentioning

confidence: 99%

A Study of Comb Beam Transmission on Phased Array Weather Radars

Yoshikawa¹,

Ushio²,

Kikuchi³

2021

IEEE Trans. Geosci. Remote Sensing

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The comb beam transmission (TX) approach, which forms a power antenna radiation pattern with multiple mainlobes, was studied for application to phased array weather radars. Combining the use of comb TX and a digital beamforming receiver enables a weather radar to observe multiple directions simultaneously. Numerical simulations show that the two-way antenna radiation patterns formed by comb TXs have properties comparable to conventional weather radar observation: almost the same mainlobe widths are achieved, and with reference to the mainlobe peak, the maximum sidelobe level is less than −37 dB, and the sidelobe level reaches −60 dB at an angle of 13.77 •. These properties are superior to the wide TXs that are normally utilized by phased array weather radars. A simulation that applied the comb TX approach to a current C-band weather radar showed that the volume scan time can be reduced from almost 500 s to 1 min.

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History of Radar Meteorology in Japan

Cited by 21 publications

References 0 publications

Drop size spectra and integral remote sensing parameters in the transition from convective to stratiform rain

Drop size spectra and integral remote sensing parameters in the transition from convective to stratiform rain

Quantitative Precipitation Estimation and Hydrological Modeling in Japan

A Study of Comb Beam Transmission on Phased Array Weather Radars

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