Long-lead forecasts of wintertime air stagnation index in southern China using oceanic memory effects
This work addresses air quality management by enabling prewinter forecasts for southern China, but it is incremental as it builds on existing methods with specific data improvements.
The study tackled long-lead forecasting of wintertime air stagnation index in southern China by developing an LSTM-based model using oceanic memory effects, achieving a correlation coefficient of 0.778 between actual and predicted ASI.
Stagnant weather condition is one of the major contributors to air pollution as it is favorable for the formation and accumulation of pollutants. To measure the atmosphere's ability to dilute air pollutants, Air Stagnation Index (ASI) has been introduced as an important meteorological index. Therefore, making long-lead ASI forecasts is vital to make plans in advance for air quality management. In this study, we found that autumn Niño indices derived from sea surface temperature (SST) anomalies show a negative correlation with wintertime ASI in southern China, offering prospects for a prewinter forecast. We developed an LSTM-based model to predict the future wintertime ASI. Results demonstrated that multivariate inputs (past ASI and Niño indices) achieve better forecast performance than univariate input (only past ASI). The model achieves a correlation coefficient of 0.778 between the actual and predicted ASI, exhibiting a high degree of consistency.