VERIFYING THE REPRESENTATION OF TROPICAL EASTERLY WAVES IN COMMUNITY CLIMATE MODEL VERSION 4
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Authors
Davis, Wesley J.
Subjects
climate
reanalysis
model
modeling
CMIP
African easterly wave
wave
tropical easterly wave
reanalysis
model
modeling
CMIP
African easterly wave
wave
tropical easterly wave
Advisors
Feldmeier, Joel W.
Powell, Scott
Date of Issue
2019-12
Date
Dec-19
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
A descriptive evaluation of the Community Climate Model version 4 (CCSM4) was performed to assess its ability to realistically simulate African easterly wave (AEW) activity. Of particular interest, does a hindcast run of CCSM4 produce AEW at approximately the same frequency as documented in the Climate Forecasting System Reanalysis (CFSR) data set during the period 1979–2005? To address this, the meridional wind anomaly at 700 hPa was evaluated using an algorithm that employed a pattern of overlapping meridional means in an area bounded by 7°N to 15°N and 20°W to 25°W. This algorithm was designed to detect a meridional wind shift of 5 knots northerly to 5 knots southerly over a period of two days. The results indicate that CCSM4 simulates AEW at realistic frequencies as compared to CFSR. This method could be applied to the other variations of Climate Model Intercomparison Project 5 (CMIP5) to detect and evaluate AEW activity.
Type
Thesis
Description
Series/Report No
Department
Meteorology (MR)
Organization
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NPS Report Number
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.