Abstract
During the period from 25 August 2012 to 11 December 2013, five typhoons were tracked passing by an observation station near the Xisha Islands in the northern South China Sea (NSCS). An analysis of the temperature observations revealed that the lower ocean layer (below the thermocline) experiences warming prior to the typhoon’s arrival. A three-dimensional model was used to analyze the dynamic processes of lower layer ocean warming. The simulations indicate that the upper layer (above the thermocline) is controlled by Ekman dynamics, with intense vertical mixing leading to upper-ocean cooling, consistent with previous understanding. Below the thermocline, the barotropic quasigeostrophic constraint emerges as the pivotal dynamic control of the waters preceding the typhoon, where the vertical velocity induced by Ekman suction drives the circulation in the lower layer. The geostrophic imbalance contributed by the pressure gradient force supplies anticlockwise acceleration and enhances divergence. Due to the negative Ekman suction and the lower layer ocean divergence, there is strong downwelling prior to the typhoon, which induces vertical warm advection leading to the warming of the intermediate ocean. Finally, a simplified estimate is formulated for the lower layer ocean warming preceding the typhoon's arrival.
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Data availability
The JTWC data were obtained at https://metoc.ndbc.noaa.gov/, the FNLs data at http://rda.ucar.edu, the ASCAT data at http://apdrc.soest.hawaii.edu:80/dods/public_data/satellite_product/ASCAT/daily, the OSTIA data at http://ghrsst-pp.metoffice.com/pages/latest_analysis/ostia.html.
Change history
02 April 2024
A Correction to this paper has been published: https://doi.org/10.1007/s00382-024-07204-3
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Acknowledgements
The JTWC data were obtained at https://metoc.ndbc.noaa.gov/, the FNLs data at http://rda.ucar.edu, the ASCAT data at http://apdrc.soest.hawaii.edu:80/dods/public_data/satellite_product/ASCAT/daily, the OSTIA data at http://ghrsst-pp.metoffice.com/pages/latest_analysis/ostia.html. This study is supported by National Natural Science Foundation of China (Grants 92158204), the National Key Research and Development Program of China (Grants 2022YFE0136600), National Natural Science Foundation of China (Grants 42076209, 41876017, 42176027, 42006022), the Science and Technology Program of Guangzhou (202102020841), Rising Star Foundation of the South China Sea Institute of Oceanology (Grants NHXX2019WL0101). The mooring datas are supplied by the Xisha Deep Sea Observatory, a member of the Network of Field Observation and Research Stations of the Chinese Academy of Science. The numerical calculation is supported by the high performance computing division and Ms. Dandan Sui and Dr. Wei Zhou of the South China Sea Institute of Oceanology.
Funding
This study is supported by National Natural Science Foundation of China (Grants 92158204), the National Key Research and Development Program of China (Grants 2022YFE0136600), National Natural Science Foundation of China (Grants 42076209, 41876017, 42176027, 42006022), the Science and Technology Program of Guangzhou (202102020841), Rising Star Foundation of the South China Sea Institute of Oceanology (Grants NHXX2019WL0101).
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QW is the first author who analyzed and wrote the manuscript. JC and YH collected the data and analyzed the variability. DW participated in the discussion and writing of the main manuscript text. PX analyzed the model results. All authors reviewed the manuscript.
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Wang, Q., Chen, J., He, Y. et al. Warming of the lower ocean layer modulated by vertical advection prior to typhoon arrival. Clim Dyn (2024). https://doi.org/10.1007/s00382-024-07157-7
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DOI: https://doi.org/10.1007/s00382-024-07157-7