Comments on

Harrison, D. E.; Chiodi, Andrew M.

doi:10.1175/jcli-d-15-0678.1

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Comments on "Characterizing ENSO Coupled Variability and Its Impact on North American Seasonal Precipitation and Temperature"

2017
By Harrison, D. E. ; Chiodi, Andrew M.
Source: Journal of Climate, 30(1), 427-436.

[PDF-1.63 MB]

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Journal Title:

Journal of Climate
Personal Author:

Harrison, D. E. ; Chiodi, Andrew M.

Harrison, D. E. ; Chiodi, Andrew M. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) Less -
Description:

El Nino and La Nina seasonal weather anomaly associations provide a useful basis for winter forecasting over the North American regions where they are sufficiently strong in amplitude and consistent in character from one event to another. When the associations during La Nina are different than El Nino, however, the obvious quasi-linear-statistical approach to modeling them has serious shortcomings. The linear approach of L'Heureux et al. is critiqued here based on observed land surface temperature and tropospheric circulation associations over North America. The La Nina associations are quite different in pattern from their El Nino counterparts. The El Nino associations dominate the statistics. This causes the linear approach to produce results that are inconsistent with the observed La Nina-averaged associations. Further, nearly all the useful North American associations have been contributed by the subset of El Nino and La Nina years that are identifiable by an outgoing longwave radiation (OLR) El Nino index and a distinct OLR La Nina index. The remaining "non-OLR events'' exhibit winter weather anomalies with large event-to-event variability and contribute very little statistical utility to the composites. The result is that the linear analysis framework is sufficiently unable to fit the observations as to question its utility for studying La Nina and El Nino seasonal temperature and atmospheric circulation relationships. An OLR-event based approach that treats La Nina and El Nino separately is significantly more consistent with, and offers an improved statistical model for, the observed relationships.
Source:

Journal of Climate, 30(1), 427-436.
DOI:

https://doi.org/10.1175/jcli-d-15-0678.1
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Journal Article
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urn:sha256:682cfa384ca964a8e11792ce922aec01ad12caa4a993696f83c705e84e7e1127
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