Observations of a freshwater pulse induced by Typhoon Morakot off the northern coast of Taiwan in August 2009

dc.contributor.author Jan, Sen
dc.contributor.author Wang, Joe
dc.contributor.author Yang, Yiing-Jang
dc.contributor.author Hung, Chin-Chang
dc.contributor.author Chern, Ching-Sheng
dc.contributor.author Gawarkiewicz, Glen G.
dc.contributor.author Lien, Ren-Chieh
dc.contributor.author Centurioni, Luca R.
dc.contributor.author Kuo, Jia-Yu
dc.contributor.author Wang, Bee
dc.date.accessioned 2014-10-08T19:55:01Z
dc.date.available 2014-10-08T19:55:01Z
dc.date.issued 2013-01-01
dc.description Author Posting. © Sears Foundation for Marine Research, 2013. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 71 (2013): 19-46, doi:10.1357/002224013807343452. en_US
dc.description.abstract In this paper we describe large-scale impacts from a typhoon on the circulation over the continental shelf and slope north of Taiwan. Typhoon Morakot was a category 2 tropical storm that landed in central Taiwan, but caused destruction primarily in southern Taiwan from Aug. 8–10, 2009. The typhoon brought record-breaking rainfall; approximately 3 m accumulated over four days in southern Taiwan. River discharge on the west coast of Taiwan increased rapidly from Aug. 6–7 and peaked on Aug. 8, yielding a total volume 27.2 km3 of freshwater discharged off the west coast of Taiwan over five days (Aug. 6–10). The freshwater mixed with ambient seawater, and was carried primarily by the northeastward-flowing Taiwan Strait current to the sea off the northern coast of Taiwan. Two joint surveys each measured the hydrography and current velocity in the Taiwan Strait and off the northeastern coast of Taiwan roughly one week and two and a half weeks after Morakot. The first survey observed an Ω-shaped freshwater pulse off the northern tip of Taiwan, in which the salinity was ∼1 lower than the climatological mean salinity. The freshwater pulse met the Kuroshio and formed a density front off the northeastern coast of Taiwan. The hydrographic data obtained in the second survey suggested that the major freshwater pulse left the sea off the northern and northeastern coasts of Taiwan, which may have been carried by the Kuroshio to the northeast. Biogeochemical sampling conducted after Morakot suggested that the concentrations of nutrients in the upper ocean off the northern coast of Taiwan increased remarkably compared with their normal values. A typhoon-induced biological bloom is attributed to the inputs both from the nutrient-rich river runoff and upwelling of the subsurface Kuroshio water. en_US
dc.description.sponsorship This study is supported by the National Science Council (NSC) of Taiwan under grant NSC98-2611-M-002-019-MY3. C.-C. Hung is supported by NSC under grant NSC100-2119-M- 110-003. LC was supported by ONR grant N00014-08-1-0557 and NOAA grant NA10OAR4320156. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Marine Research 71 (2013): 19-46 en_US
dc.identifier.doi 10.1357/002224013807343452
dc.identifier.uri https://hdl.handle.net/1912/6891
dc.language.iso en_US en_US
dc.publisher Sears Foundation for Marine Research en_US
dc.relation.uri https://doi.org/10.1357/002224013807343452
dc.title Observations of a freshwater pulse induced by Typhoon Morakot off the northern coast of Taiwan in August 2009 en_US
dc.type Article en_US
dspace.entity.type Publication
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