Details:

Journal Title:
Journal of Climate
Personal Author:
Chiodi, Andrew M. ; Harrison, D. E.
Chiodi, Andrew M. ; Harrison, D. E. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean)
OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) Less -
Description:
The unexpected halt of warm sea surface temperature anomaly (SSTA) growth in 2014 and development of a major El Nino in 2015 has drawn attention to our ability to understand and predict El Nino development. Wind stress-forced ocean model studies have satisfactorily reproduced observed equatorial Pacific SSTAs during periods when data return from the TAO/TRITON buoy network was high. Unfortunately, TAO/TRITON data return in 2014 was poor. To study 2014 SSTA development, the observed wind gaps must be filled. The hypothesis that subseasonal wind events provided the dominant driver of observed waveguide SSTA development in 2014 and 2015 is used along with the available buoy winds to construct an oceanic waveguide-wide surface stress field of westerly wind events (WWEs) and easterly wind surges (EWSs). It is found that the observed Nino-3.4 SSTA development in 2014 and 2015 can thereby be reproduced satisfactorily. Previous 2014 studies used other wind fields and reached differing conclusions about the importance of WWEs and EWSs. Experiment results herein help explain these inconsistencies, and clarify the relative importance of WWEs and EWSs. It is found that the springtime surplus of WWEs and summertime balance between WWEs and EWSs (yielding small net wind stress anomaly) accounts for the early development and midyear reversal of El Nino-like SSTA development in 2014. Astrong abundance of WWEs in 2015 accounts for the rapid SSTA warming observed then. Accurately forecasting equatorial Pacific SSTA in years like 2014 and 2015 may require learning to predict WWE and EWS occurrence characteristics.

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Source:
Journal of Climate, 30(4), 1505-1519.
DOI:
https://doi.org/10.1175/jcli-d-16-0385.1
Document Type:
Journal Article
Funding:
Grant no. NA10OAR4320148 ; Grant no. 100007298
Grant no. NA10OAR4320148 ; Grant no. 100007298 Less -
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:babddea6cf39a0f952c5bd237940cb2bb8e9fe929b38cd42dfc048e7e5b4e751
Download URL:
https://repository.library.noaa.gov/view/noaa/17662/noaa_17662_DS1.pdf
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