Monitoring ocean currents during the passage of Typhoon Muifa using optical-fiber distributed acoustic sensing
Lin, J.; Fang, S.; He, R.; Tang, Q.; Qu, F.; Wang, B.; Xu, W. (2024). Monitoring ocean currents during the passage of Typhoon Muifa using optical-fiber distributed acoustic sensing. Nature Comm. 15(1): 1111. https://dx.doi.org/10.1038/s41467-024-45412-x
In: Nature Communications. Nature Publishing Group: London. ISSN 2041-1723; e-ISSN 2041-1723, more
|   |
| Authors | | Top |
- Lin, J.
- Fang, S.
- He, R.
- Tang, Q.
|
|
|
| Abstract |
In situ observations under typhoon conditions are sparse and limited. Distributed acoustic sensing (DAS) is an emerging technology that uses submarine optical-fiber (OF) cables to monitor the sea state. Here, we present DAS-based ocean current observations when a super typhoon passed overhead. The microseismic noise induced by ocean surface gravity waves (OSGWs) during Typhoon Muifa (2022) is observed in the ~0.08–0.38 Hz frequency band, with high-frequency (>0.3 Hz) component being tidally modulated. The OSGW propagation along the entire cable is successfully revealed via frequency–wavenumber analysis. Further, a method based on the current-induced Doppler shifts of DAS-recorded OSGW dispersions is proposed to calculate both speeds and directions of horizontal ocean currents. The measured current is consistent with the tidally induced sea-level fluctuations and sea-surface winds observed at a nearby ocean buoy. These observations demonstrate the feasibility of monitoring the ocean current under typhoon conditions using DAS-instrumented cables. |
|
