Seasonal prediction skills in the CAMS-CSM climate forecast system
| Autor: | Jian Li, Yanli Tang, Renguang Wu, Libin Ma, Haoming Chen, Bo Liu, Jingzhi Su, Lijuan Hua, Xinyao Rong, Boqi Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Atmospheric Science
Coupled model intercomparison project 010504 meteorology & atmospheric sciences Anomaly (natural sciences) Forecast skill 010502 geochemistry & geophysics 01 natural sciences Sea surface temperature Anticyclone Climatology Climate Forecast System Environmental science Indian Ocean Dipole Predictability 0105 earth and related environmental sciences |
| Zdroj: | Climate Dynamics. 57:2953-2970 |
| ISSN: | 1432-0894 0930-7575 |
| Popis: | The seasonal prediction skills in the CAMS-CSM (the acronym stands for the Chinese Academy of Meteorological Sciences Climate System Model) climate forecast system is evaluated with a set of retrospective forecast experiments during the period of 1981–2019. The CAMS-CSM, which has been registered for the sixth phase of the coupled model intercomparison project (CMIP6), is an atmosphere–ocean–land–sea ice fully coupled general circulation model. The assimilation scheme used in the forecast system is the 3-dimentional nudging, including both the atmospheric and oceanic components. The analyses mainly focus on the seasonal predictable skill of sea surface temperature, 2-m air temperature, and precipitation anomalies. The analyses revealed that the model shows a good prediction skill for the SST anomalies, especially in the tropical Pacific, in association with El Nino-Southern Oscillation (ENSO) events. The anomaly correlation coefficient (ACC) score for ENSO can reach 0.75 at 6-month lead time. Furthermore, the extreme warm/cold Indian Ocean dipole (IOD) events are successfully predicted at 3- and even 6-month lead times. The whole ACC of IOD events between the observation and the prediction can reach 0.51 at 2-month lead time. There are reliable seasonal prediction skills for 2-m air temperature anomalies over most of the Northern Hemisphere, where the correlation is mainly above 0.4 at 2-month lead time, especially over the East Asia, North America and South America. However, the seasonal prediction for precipitation still faces a big challenge. The source of precipitation predictability over the East Asia can be partly related to strong ENSO events. Additionally, the anomalous anticyclone over the western North Pacific (WPAC) which connects the ENSO events and the East Asian summer monsoon (EASM) can be well predicted at 6-month lead time. |
| Databáze: | OpenAIRE |
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