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Title: Dynamics of simulated Atlantic upwelling annual cycle in CMIP5 models

As one of the prominent climatic component of tropical climate system, the annual cycle of the equatorial Atlantic cold tongue region has been a subject of significant research. In this work, we examine the fidelity of the key part of the annual cycles, namely, the upwelling annual cycles, from the simulations of the Coupled Model Intercomparison Project Phase 5 (CMIP5). Utilizing the simple framework we have recently developed based on the Zebiak–Cane (ZC) ocean model, we first tested the validity of the simple framework of upwelling as a combination of the local wind–driven Ekman upwelling and nonlocal wind–driven wave upwelling. It is demonstrated that the theoretically reconstructed upwelling annual cycles to large extent are in good agreement with the simulations in these coupled climatic models. Comparing with observations, we show that the semiannual component of the upwelling is systematically too strong. This significant bias is attributable to the dynamic amplification to the wind–driven wave upwelling originated from a less significant bias in the semiannual harmonic component in the central equatorial wind field. The latter is dynamically amplified in the wind–driven wave upwelling owing to its relatively fast time scale. Furthermore, the realistic simulations of equatorial annual cycles may sensitively dependmore » on good simulations of the semiannual harmonic components in equatorial wind fields.« less
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [1]
  1. National Taiwan Normal Univ., Taipei (Taiwan)
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Publication Date:
Grant/Contract Number:
SC0005110; 105-2119-M-003-003; 104-2611-M-003-002-MY3
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Oceans
Additional Journal Information:
Journal Volume: 122; Journal Issue: 7; Journal ID: ISSN 2169-9275
Publisher:
American Geophysical Union
Research Org:
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Atlantic; upwelling; CMIP5
OSTI Identifier:
1474276
Alternate Identifier(s):
OSTI ID: 1377940

Wang, Li -Chiao, Jin, Fei -Fei, and Wu, Chau -Ron. Dynamics of simulated Atlantic upwelling annual cycle in CMIP5 models. United States: N. p., Web. doi:10.1002/2017JC012781.
Wang, Li -Chiao, Jin, Fei -Fei, & Wu, Chau -Ron. Dynamics of simulated Atlantic upwelling annual cycle in CMIP5 models. United States. doi:10.1002/2017JC012781.
Wang, Li -Chiao, Jin, Fei -Fei, and Wu, Chau -Ron. 2017. "Dynamics of simulated Atlantic upwelling annual cycle in CMIP5 models". United States. doi:10.1002/2017JC012781. https://www.osti.gov/servlets/purl/1474276.
@article{osti_1474276,
title = {Dynamics of simulated Atlantic upwelling annual cycle in CMIP5 models},
author = {Wang, Li -Chiao and Jin, Fei -Fei and Wu, Chau -Ron},
abstractNote = {As one of the prominent climatic component of tropical climate system, the annual cycle of the equatorial Atlantic cold tongue region has been a subject of significant research. In this work, we examine the fidelity of the key part of the annual cycles, namely, the upwelling annual cycles, from the simulations of the Coupled Model Intercomparison Project Phase 5 (CMIP5). Utilizing the simple framework we have recently developed based on the Zebiak–Cane (ZC) ocean model, we first tested the validity of the simple framework of upwelling as a combination of the local wind–driven Ekman upwelling and nonlocal wind–driven wave upwelling. It is demonstrated that the theoretically reconstructed upwelling annual cycles to large extent are in good agreement with the simulations in these coupled climatic models. Comparing with observations, we show that the semiannual component of the upwelling is systematically too strong. This significant bias is attributable to the dynamic amplification to the wind–driven wave upwelling originated from a less significant bias in the semiannual harmonic component in the central equatorial wind field. The latter is dynamically amplified in the wind–driven wave upwelling owing to its relatively fast time scale. Furthermore, the realistic simulations of equatorial annual cycles may sensitively depend on good simulations of the semiannual harmonic components in equatorial wind fields.},
doi = {10.1002/2017JC012781},
journal = {Journal of Geophysical Research. Oceans},
number = 7,
volume = 122,
place = {United States},
year = {2017},
month = {5}
}