Tropical Climate Response to Tidal Mixing in the Eastern Pacific

Title
Tropical Climate Response to Tidal Mixing in the Eastern Pacific
Author(s)
김영호; 국종성; 임보영; Ryo Furue
Publication Year
2013-12-04
Abstract
Response of the equatorial climate to the tidal mixing is investigated using a coupled climate model and an ocean stand-alone model. To parameterizethe tidal mixing, the vertical mixing coefficient was introduced to the background from the tidal velocity and bottom roughness following Jayne and St.Laurent (2001). The tidal mixing increases the sea surface temperature especially in the eastern tropical Pacific as well as deepens the thermoclineover the whole tropical Pacific. In particular, the deepening of the thermocline deceases the ENSO variability, which has been over-simulated in theclimate models, by ~9% for NINO3.4 and ~17% for NINO4. In addition, the ocean stand-alone model shows that the tidal mixing generates the warmanomaly near the eastern coast of the tropical Pacific to propagate westward along the thermocline depth of the off-equator. As a result, thethermocline depth deepens by ~10m along the equator. Consequently, it is shown that the tidal mixing takes an effect to the climate variability in thetropical Pacific through the oceanic response.e tidal velocity and bottom roughness following Jayne and St.Laurent (2001). The tidal mixing increases the sea surface temperature especially in the eastern tropical Pacific as well as deepens the thermoclineover the whole tropical Pacific. In particular, the deepening of the thermocline deceases the ENSO variability, which has been over-simulated in theclimate models, by ~9% for NINO3.4 and ~17% for NINO4. In addition, the ocean stand-alone model shows that the tidal mixing generates the warmanomaly near the eastern coast of the tropical Pacific to propagate westward along the thermocline depth of the off-equator. As a result, thethermocline depth deepens by ~10m along the equator. Consequently, it is shown that the tidal mixing takes an effect to the climate variability in thetropical Pacific through the oceanic response.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26481
Bibliographic Citation
Asia Oceania Geosciences Society, pp.1 - 2, 2013
Publisher
Asia
Type
Conference
Language
English
Publisher
Asia
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