基于机器学习的海表温度对中国降水的预测研究-海洋预报

基于机器学习的海表温度对中国降水的预测研究

单位：1. 国家卫星海洋应用中心, 北京 100081;
2. 国家海洋环境预报中心, 北京 100081;
3. 自然资源部空间海洋遥感与应用重点实验室, 北京 100081;
4. 南方海洋科学与工程广东省实验室, 广东广州 511458

关键词：K-means 聚焦时延神经网络主成分分析降水海表温度

分类号：P731.11;P426.6

出版年·卷·期（页码）：2021·38·第三期（29-37）

摘要：

利用K-means聚类算法将36 a的中国周降水数据聚类为7个区域，其中非季风区的中国西北和青藏高原的大部分地区聚类为两个区域，其余区域聚类为5个区域。将各区域的降水量数据经过指数平滑之后，输入聚焦时延神经网络（FTDNN），求解其与经过主成分分析降维处理的SST之间的关系。结果表明：季风区的降水量最佳延迟时间比远离海洋的非季风区域的最佳延迟时间大，同时也得到了预测各区域降水的最佳延迟时间。在对各区域的降水量进行短期和中长期的预测中得出，FTDNN神经网络在利用降维后的SST预测降水量上显示出很好的预测效果，尤其是中长期趋势的预测，与传统的小波变换重建原序列以及均生函数方法的预测结果相比，相关系数和均方根误差都有了很大的提高，新疆地区测试结果的相关系数比小波变换结果提高了0.05。

In this paper, 36 years of weekly precipitation data in China are clustered into 7 regions by using K-means clustering algorithm. Most areas of the northwest China and Qinghai-Tibet Plateau, which belong to non-monsoon areas, are clustered into two regions, and the rest areas of China are clustered into five regions. The precipitation data of each region are input into Focused Time-Delay Neural Network (FTDNN) after exponential smoothing, and the relationship between FTDNN and SST reduced by Principal Component Analysis (PCA) is solved. At the same time, the optimal delay time for predicting precipitation in each region is also obtained. The results show that the FTDNN neural network has a good effect on the prediction of precipitation, especially for its medium and long term trend, compared with the traditional wavelet transform to reconstruct the original series and the mean generating function method. The correlation coefficient and root mean square error of the prediction results in this paper is greatly improved. The correlation coefficient of the test results in Xinjiang increases by 0.05 compared with the results of wavelet transform.

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