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Global Representation of Tropical Cyclone-induced Ocean Thermal Changes Using Argo Data – Part 1: Methods and Results : Volume 11, Issue 6 (09/12/2014)

By Cheng, L.

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Book Id: WPLBN0004020822
Format Type: PDF Article :
File Size: Pages 48
Reproduction Date: 2015

Title: Global Representation of Tropical Cyclone-induced Ocean Thermal Changes Using Argo Data – Part 1: Methods and Results : Volume 11, Issue 6 (09/12/2014)  
Author: Cheng, L.
Volume: Vol. 11, Issue 6
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Sriver, R. L., Zhu, J., & Cheng, L. (2014). Global Representation of Tropical Cyclone-induced Ocean Thermal Changes Using Argo Data – Part 1: Methods and Results : Volume 11, Issue 6 (09/12/2014). Retrieved from http://worldlibrary.net/


Description
Description: International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China. Argo floats are used to examine tropical cyclone (TC)-induced ocean thermal changes on the global scale by comparing temperature profiles before and after TC passage. We present a footprint method that analyzes cross-track thermal responses along all storm tracks during the period 2004–2012. We combine the results into composite representations of the vertical structure of the average thermal response for two different categories: tropical storms/depressions (TS/TD) and hurricanes. The two footprint composites are functions of three variables: cross-track distance, water depth and time relative to TC passage. We find that this footprint strategy captures the major features of the upper-ocean thermal response to TCs on time scales up to 20 days when compared against previous case study results using in situ measurements. Further, TC effects are distinguishable from background sampling variability, but the significance of this result depends on differences in regional oceanic conditions and the intensity of the TC events. On the global scale, results indicate that hurricanes induce strong upwelling near the storm center, along with downwelling away from the storm, during the first 3 days after storm passage. We also find significant subsurface warming between 30 and 200 m depth for both hurricanes and TS/TDs. On average, the subsurface ocean response persists along storm tracks for up to 20 days down to 200 (400) m depth for TS/TD (Hurricanes), exhibiting peak warming of 0.4 °C at 60 m for hurricanes and 0.2 °C at 35 m for TS/TD. The footprint method shows a weak cooling response between 200 and 400 m, which is significant for Hurricanes but not for TS/TD.

Summary
Global representation of tropical cyclone-induced ocean thermal changes using Argo data – Part 1: Methods and results

Excerpt
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