| 1. |
- Chen, Sheng, et al.
(author)
-
On the First Observed Wave-Induced Stress Over the Global Ocean
- 2020
-
In: Journal of Geophysical Research - Oceans. - : AMER GEOPHYSICAL UNION. - 2169-9275 .- 2169-9291. ; 125:12
-
Journal article (peer-reviewed)abstract
- Despite many investigations/studies on the surface wave-induced stress, the global feature of the wave-induced stress has not been obtained previously as that requires a simultaneous observation of wave spectra and wind on a global scale. The China France Oceanography Satellite (CFOSAT) provided an opportunity for the first time to evaluate the global wave-induced stress and its contribution to the total wind stress. In this study, the global spatial distributions of wave-induced stress and its correlated index for August to November in 2019 are presented using the simultaneous ocean surface winds and wave spectra from the CFOSAT. The main results show that the wave-induced stress is fundamentally dependent on the wind and wave fields on a global scale and shows significant temporal and spatial variations. Further analyses indicate that there is an upward momentum flux under strong swells and low wind speeds (below similar to 5 m/s), and an anticorrelation between the dimensionless wave-induced stress and the proportion of swell energy to the total. Finally, the variations of the surface wave induced wind stress are clear asymmetric between northern and southern hemispheres in late summer but symmetric in late fall, which are closely associated with the seasonal changes in large-scale atmospheric circulation.
|
|
| 2. |
- Li, Songlin, et al.
(author)
-
Effects of Sea Spray on Extreme Precipitation Forecasting: A Case Study in Beijing of China
- 2024
-
In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 51:15
-
Journal article (peer-reviewed)abstract
- This study investigates the effects of sea spray on extreme precipitation forecast in Beijing of China between 28 July and 2 August 2023 as a case test. In this case, fully coupled model increased upward moisture in the Bohai and Yellow Seas and increased accumulated rainfall by 21% in North China. For the extreme precipitation events with the 5-day accumulated precipitation exceeding 500 mm, the atmosphere-only model did not forecast the events; the coupled model without sea spray performed well with the 0.29 threat score (TS) and 88 mm root mean square error (RMSE); in the fully coupled model, the effects of sea spray increased atmospheric instability, which increased the precipitation around Beijing and yielded a more accurate forecast with the 0.37 TS and 65 mm RMSE. This paper suggests a scientific clue to improve numerical simulation for extreme rainfall events, however, more cases are still needed for statistical evaluation.
|
|
