Affiliation:
1. College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410000, China
2. College of Frontier Interdisciplinary, National University of Defense Technology, Changsha 410000, China
Abstract
The factors influencing precipitation in western China are quite complex, which increases the difficulty in determining accurate predictors. Hence, this paper models the monthly measured precipitation data from 240 meteorological stations in mainland China and the precipitation data from the European Centre for Medium-Range Weather Forecasts and the National Climate Centre and employs 88 atmospheric circulation indices to develop a precipitation prediction scheme. Specifically, a high-quality grid-point field is created by fusing and revising the precipitation data from multiple sources. This field is combined with the Empirical Orthogonal Function decomposition and the causal information flow. Next, the best predictors are screened through Empirical Orthogonal Function decomposition and causal information flow, and a data-driven precipitation prediction model is established using a Back Propagation Neural Network and a Random Forest algorithm to conduct the 1-month, 3-month, and 6-month precipitation predictions. The results show that: The machine learning-based precipitation prediction model has high accuracy and is generally able to predict the precipitation trend in the western region better. The Random Forest algorithm significantly outperforms the Back Propagation Neural Network algorithm in the prediction of the three starting times, and the prediction ability of both models gradually decreases as the starting time increases. Compared with the 2022 flood season prediction scores of the Institute of Atmospheric Sciences of the Chinese Academy of Sciences, the model improves the prediction of 1-month and 3-month precipitation in the western region and provides a new idea for the short-term climate prediction of precipitation in western China.
Funder
National Natural Science Foundation
Subject
Atmospheric Science,Environmental Science (miscellaneous)
Reference33 articles.
1. Temporal and spatial variation of precipitation over western China during 1954–2006;Guo;J. Glaciol. Geocryol.,2013
2. Climatic analysis of precipitation anomalies in northwest China;Chen;J. Desert Res.,2013
3. Permafrost changes in the northern limit of permafrost on the Qinghai–Tibet Plateau in the last 30 years;Nan;Acta Geogr. Sin.,2003
4. Seasonal precipitation variability in mainland China based on entropy theroy;Wu;Int. J. Climatol.,2021
5. Preliminary Study on Probability Forecasting of Flash-Heavy-Rain in Chengdu;Mai;Plateau Mt. Meteorol. Res.,2022