Upper ocean response to tropical cyclone wind forcing: A case study of typhoon Rammasun (2008)
- 98 Downloads
The characteristics of the upper ocean response to tropical cyclone wind (TCW) forcing in the northwestern Pacific were investigated using satellite and Argo data, as well as an ocean general circulation model. In particular, a case study was carried out on typhoon Rammasun, which passed through our study area during May 6–13, 2008. It is found that the local response right under the TCW forcing is characterized by a quick deepening of the surface mixed layer, a strong latent heat loss to the atmosphere, and an intense upwelling near the center of typhoon, leading to a cooling of the oceanic surface layer that persists as a cold wake along the typhoon track. More interestingly, the upper ocean response exhibits a four-layer thermal structure, including a cooling layer near the surface and a warming layer right below, accompanied by another pair of cooling/warming layers in the thermocline. The formation of the surface cooling/warming layers can be readily explained by the strong vertical mixing induced by TCW forcing, while the thermal response in the thermocline is probably a result of the cyclone-driven upwelling and the associated advective processes.
Keywordstropical cyclone wind forcing upper ocean response satellite and Argo data ocean modeling
Unable to display preview. Download preview PDF.
- Chen G, Tam C Y. 2010. Different impacts of two kinds of Pacific Ocean warming on tropical cyclone frequency over the western North Pacific. Geophys Res Lett, 37: L01803, doi: 10.1029/2009GL041708Google Scholar
- Chu J H, Sampson C R, Levine A S, et al. 2002. The Joint Typhoon Warning Center tropical cyclone best tracks, 1945-2000. Naval Research Laboratory Technical Report. NRL/MR/7540-02-16, 112Google Scholar
- Ginis I. 2002. Tropical cyclone-ocean interactions. In: Perrie W, ed. Atmosphere–Ocean Interactions. Boston: WIT Press. 83–114Google Scholar
- Levitus S, Antonov J, Boyer T. 2005. Warming of the world ocean, 1955-2003. Geophys Res Lett, 32: L02604, doi: 10.1029/ 2004GL021592Google Scholar
- Price J F, Morzel J, Niiler P P. 2008. Warming of SST in the cool wake of a moving hurricane. J Geophys Res, 113: C07010, doi: 10.1029/ 2007JC004393Google Scholar
- Vincent E M, Lengaigne M, Madec G, Vialard J, Samson G, Jourdain N C, Menkes C E, Jullien S. 2012. Processes setting the characteristics of sea surface cooling induced by tropical cyclones. J Geophys Res, 117: C02020, doi: 10.1029/2011JC007396Google Scholar
- Wu Q, Chen D. 2012. Typhoon-induced variability of the oceanic surface mixed layer observed by Argo floats in the western north Pacific ocean. Atmos Ocean, 50 (supl): 4–14Google Scholar