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The Phase-Locking of Tropical North Atlantic and the Contribution of ENSO

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2021gl095610· OSTI ID:1978520
 [1];  [2];  [2]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States); OSTI
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
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The Tropical North Atlantic (TNA) is characterized by significant interannual variability in sea surface temperature (SST), which is phase-locked to the boreal spring. In this study, the phase-locking of TNA is investigated by adopting a linear stochastic-dynamical model (SDM) using seasonally modulated TNA feedbacks together with the seasonal modulation of ENSO forcing. In the observations, the role of local TNA feedbacks and ENSO forcing in TNA phase-locking are equivalently important with both preferring the peak of TNA variability to appear in the boreal spring. Besides, the seasonal modulation of TNA feedbacks and ENSO forcing strength are both mainly controlled by thermodynamic processes. In most climate models, the contribution of ENSO on TNA phase-locking is weaker than that in observations. The strength of ENSO-related TNA phase-locking is highly correlated with the relationship between ENSO and TNA, which is mainly determined by the amplitude of ENSO and its teleconnection patterns.
Research Organization:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0005110
OSTI ID:
1978520
Alternate ID(s):
OSTI ID: 1833118
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 23 Vol. 48; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
CMIP model
ENSO
Tropical North Atlantic
phase-locking
stochastic-dynamical model