Modeling of upper ocean heat budget variations in response to the passage of super typhoon Sinlaku (2008) in the western North Pacific

TitleModeling of upper ocean heat budget variations in response to the passage of super typhoon Sinlaku (2008) in the western North Pacific
Publication TypeJournal Article
Year of Publication2015
AuthorsZheng Z.W, Kuo N.J, Zheng Q.N, Gopalakrishnan G
JournalJournal of Marine Science and Technology-Taiwan
Volume23
Pagination551-557
Date Published2015/08
Type of ArticleArticle
ISBN Number1023-2796
Accession NumberWOS:000361578900019
Keywordsair-sea interaction; coordinate; explicit; gulf-of-mexico; hurricane-opal; layer; model; numerical modeling; Regional Ocean Modeling System; surface; system; thermal structure; tropical cyclone; typhoons
Abstract

In 2008, Super Typhoon Sinlaku (2008) passed over a preexisting cyclonic eddy (PCE) in the western North Pacific, causing an extreme cooling response at 22.5 degrees N, 125 degrees E. This case provides a rare opportunity to explore the physical mechanisms that trigger an extreme cooling response to a typhoon underlying the influence of PCEs. In this study, cooling response to Sinlaku was observed by TMI/AMSR-E microwave SSTs and simulated using the Regional Ocean Modeling System. To elucidate the impact of a PCE, in addition to standard run (EXPstd), another experiment that eliminates the influence of a PCE (EXPnonPCE) was designed and executed. By conducting upper ocean heat budget analysis on modeling diagnostic outputs, it is found that PCE enhances the cooling response by enhancing both the entrainment and upwelling simultaneously; but the dominant terms balancing the heat budget were not greatly altered by the PCE. Finally, the vertical thermal gradient is shown to be the essential factor boosting the enhancement of entrainment and upwelling, thus cooling the upper ocean.

DOI10.6119/jmst-013-0909-6
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