| Title: | Development of the Real-Time 30-s-Update Big Data Assimilation System for Convective Rainfall Prediction With a Phased Array Weather Radar : Description and Preliminary Evaluation |
| Authors: | Honda, T. Browse this author |
| Amemiya, A. Browse this author |
| Otsuka, S. Browse this author |
| Lien, G. -Y. Browse this author |
| Taylor, J. Browse this author |
| Maejima, Y. Browse this author |
| Nishizawa, S. Browse this author |
| Yamaura, T. Browse this author |
| Sueki, K. Browse this author |
| Tomita, H. Browse this author |
| Satoh, S. Browse this author |
| Ishikawa, Y. Browse this author |
| Miyoshi, T. Browse this author |
| Keywords: | data assimilation |
| phased-array weather radar |
| numerical weather prediction |
| Issue Date: | Jun-2022 |
| Publisher: | American Geophysical Union |
| Journal Title: | Journal of Advances in Modeling Earth Systems |
| Volume: | 14 |
| Issue: | 6 |
| Start Page: | e2021MS002823 |
| Publisher DOI: | 10.1029/2021MS002823 |
| Abstract: | We present the first ever real-time numerical weather prediction system with 30-s update cycles at a 500-m grid spacing for the prediction of convective precipitation in the subsequent 30 min using a new-generation multi-parameter phased array weather radar. The system comprises a regional atmospheric model known as the SCALE and the local ensemble transform Kalman filter (LETKF). To accelerate the SCALE-LETKF system, data transfer between the two aforementioned components is performed using a memory copy instead of a file I/O. A complete real-time workflow including domain nesting and observational data transfer is constructed. A real-time test in July and August 2020 showed that the system is fast enough for a real-time application of 30-s forecast-analysis cycles and 30-min prediction. The development includes a new thinning method considering the spatially correlated observation errors in the dense radar data. This new thinning method is effective in two past case studies in the summer of 2019. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86478 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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