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ENSO Fidelity in Two Coupled Models

Title: ENSO Fidelity in Two Coupled Models.
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Name(s): Michael, J-P, author
Chassignet, Eric, professor co-directing thesis
Misra, Vasu, professor co-directing thesis
Wu, Zhaohua, committee member
Department of Earth, Ocean and Atmospheric Sciences, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: text
Issuance: monographic
Date Issued: 2010
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
Physical Form: online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: This study examines the fidelity of the ENSO simulation in two coupled model integrations and compares this with available global ocean data assimilation. The two models are CAM-HYCOM coupled model developed by the HYCOM Consortium and CCSM3.0. The difference between the two climate models is in the use of different ocean general circulation model (OGCM). The hybrid isopycnal-sigma-pressure coordinate ocean model Hybrid Coordinate Ocean Model (HYCOM) replaces the ocean model Parallel Ocean Program (POP) of the CCSM3.0. In both, the atmospheric general circulation model (AGCM) Community Atmosphere Model (CAM) is used. In this way the coupled systems are compared in a controlled setting so that the effects of the OGCM may be obtained. Henceforth the two models will be referred to as CAM-HYCOM and CAM-POP respectively. Comparison of 200 years of model output is used discarding the first 100 years to account for spin-up issues. Both models (CAM-HYCOM and CAM-POP) are compared to observational data for duration, intensity, and global impacts of ENSO. Based on the analysis of equatorial SST, thermocline depth, wind stress and precipitation, ENSO in the CAM-HYCOM model is weaker and farther east than observations while CAM-POP is zonal and extends west of the international dateline. CAM-POP also has an erroneous biennial cycle of the equatorial pacific SSTs. The analysis of the subsurface ocean advective terms highlights the problems of the model simulations.
Identifier: FSU_migr_etd-2451 (IID)
Submitted Note: A Thesis Submitted to the Department of Earth, Ocean and Atmospheric Science in Partial FulfiLlment of the Requirements for the Degree of Master of Science.
Degree Awarded: Fall Semester, 2010.
Date of Defense: August 31, 2010.
Keywords: General Circulation Model, El Nino, Coupled Model, Climate Model, ENSO
Bibliography Note: Includes bibliographical references.
Advisory Committee: Eric Chassignet, Professor Co-Directing Thesis; Vasu Misra, Professor Co-Directing Thesis; Zhaohua Wu, Committee Member.
Subject(s): Earth sciences
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2451
Owner Institution: FSU