A deep learning method for real-time bias correction of wind field forecasts in the Western North Pacific

Zhang Wei; Jiang Yueyue; Dong JunyuSong XiaojiangPang RenboGuoan BoyuYu Hui

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A deep learning method for real-time bias correction of wind field forecasts in the Western North Pacific

机译：A deep learning method for real-time bias correction of wind field forecasts in the Western North Pacific

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摘要

Forecasts by the European Centre for Medium-Range Weather Forecasts (ECMWF; EC for short) can provide a basis for the establishment of maritime-disaster warning systems, but they contain some systematic biases. The fifth-generation EC atmospheric reanalysis (ERA5) data have high accuracy, but are delayed by about 5 days. To overcome this issue, a spatiotemporal deep-learning method could be used for nonlinear mapping between EC and ERA5 data, which would improve the quality of EC wind forecast data in real time. In this study, we developed the Multi-Task-Double Encoder Trajectory Gated Recurrent Unit (MT-DETrajGRU) model, which uses an improved "double-encoder forecaster" architecture to model the spatiotemporal sequence of the U and V components of the wind field; we designed a multi-task learning loss function to correct wind speed and wind direction simultaneously using only one model. The study area was the western North Pacific (WNP), and realtime rolling bias corrections were made for 10-day wind-field forecasts released by the EC between December 2020 and November 2021, divided into four seasons. Compared with the original EC forecasts, after correction using the MT-DETrajGRU model the wind speed and wind direction biases in the four seasons were reduced by 8-11 and 9-14, respectively. In addition, the proposed method modelled the data uniformly under different weather conditions. The correction performance under normal and typhoon conditions was comparable, indicating that the data-driven mode constructed here is robust and generalizable.

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来源
《Atmospheric research》 |2023年第3期|1.1-1.13|共13页
作者
Zhang Wei; Jiang Yueyue; Dong JunyuSong XiaojiangPang RenboGuoan BoyuYu Hui;
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作者单位

Ocean Univ China;

Natl Marine Environm Forecasting Ctr;

Univ Portsmouth;

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正文语种英语
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关键词
NWP wind field forecasts; Real-time bias correction; Wind components; Spatiotemporal learning; Multi-task learning;

A deep learning method for real-time bias correction of wind field forecasts in the Western North Pacific

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