Integrated Design and Realization of 400-Gb/s Optical Transceivers

Wang, Ling-Chi; Wang, Hao-Lian; Kuo, Zi-Yu; Chiu, I-Wei; Luo, K.; Chung, Lung Wei; Lee, San‐Liang; Hung, Hung-Wen

doi:10.1109/foan.2019.8933806

Cited by 1 publication

(1 citation statement)

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“…The RadarVar v1.0 operator is integrated into the community WRFDA software and will be publicly available in a future release. The code of RadarVar v1.0 and the scripts for running experiments in this study can be obtained at https://github.com/children1985/WRFDA_gmdd (Wang, 2019). The GFS data are available at https: //www.ncdc.noaa.gov/data-access/model-data/model-datasets/ global-forcast-system-gfs (National centers for environmental information, 2019a) and the radar data can be downloaded at https://www.ncdc.noaa.gov/nexradinv/ (National centers for environmental information, 2019b).…”

Section: Discussionmentioning

confidence: 99%

A radar reflectivity operator with ice-phase hydrometeors for variational data assimilation (version 1.0) and its evaluation with real radar data

Wang

Liu

2019

Geosci. Model Dev.

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A reflectivity forward operator and its associated tangent linear and adjoint operators (together named Radar-Var) were developed for variational data assimilation (DA). RadarVar can analyze both rainwater and ice-phase species (snow and graupel) by directly assimilating radar reflectivity observations. The results of three-dimensional variational (3D-Var) DA experiments with a 3 km grid mesh setting of the Weather Research and Forecasting (WRF) model showed that RadarVar was effective at producing an analysis of reflectivity pattern and intensity similar to the observed data. Two to three outer loops with 50-100 iterations in each loop were needed to obtain a converged 3-D analysis of reflectivity, rainwater, snow, and graupel, including the melting layers with mixed-phase hydrometeors. It is shown that the deficiencies in the analysis using this operator, caused by the poor quality of the background fields and the use of the static background error covariance, can be partially resolved by using radar-retrieved hydrometeors in a preprocessing step and tuning the spatial correlation length scales of the background errors. The direct radar reflectivity assimilation using Radar-Var also improved the short-term (2-5 h) precipitation forecasts compared to those of the experiment without DA.

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Section: Discussionmentioning

confidence: 99%