Details:

Journal Title:
Geophysical Research Letters
Personal Author:
Wang, Shuguang ; Ma, Ding ; Sobel, Adam H. ; Tippett, Michael K.
Wang, Shuguang ; Ma, Ding ; Sobel, Adam H. ; Tippett, Michael K. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
The spatial structure and propagation of tropical intraseasonal convection anomalies diagnosed with the outgoing longwave radiation‐based Madden‐Julian Oscillation index are examined in the boreal summer and winter seasons. It is shown that the outgoing longwave radiation‐based Madden‐Julian Oscillation index represents both northward and eastward propagation in summer and eastward propagation in winter in a manner consistent with Madden‐Julian Oscillation and Boreal Summer Intraseasonal Oscillation propagation as diagnosed in many previous studies. The outgoing longwave radiation‐based Madden‐Julian Oscillation index and three other widely used indices for tracking the Boreal Summer Intraseasonal Oscillation are then compared in their lag correlation structure over selected reference areas, cross‐correlation coefficients of the two principal component time series, and time‐dependent phase angle composites. The outgoing longwave radiation anomalies from these different indices propagate differently according to these diagnostics. One of them exhibits little propagation at all, even though one would expect good propagation based on composites of the phases separately. This illustrates the general point that while composites of individual phases, presented in a sequence, are generally taken to imply that the phases tend to occur in that sequence in time, that need not be the case. It is suggested that propagation characteristics are relevant to the application of the indices and that smoother propagation is desirable.
Keywords:
[+]
General Earth And Planetary Sciences Geophysics
Source:
Geophysical Research Letters, 45(18), 9934-9943
DOI:
https://doi.org/10.1029/2018gl078321
ISSN:
0094-8276;1944-8007;
Format:
PDF
Publisher:
American Geophysical Union (AGU)
Document Type:
Journal Article
Funding:
Grant no. NA16OAR4310076
Rights Information:
Other
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:b8bad9574213d2779ff9d30ab1f2597a79107422ba6e1b62311cbc1d75370d83
Download URL:
https://repository.library.noaa.gov/view/noaa/59832/noaa_59832_DS1.pdf
File Type:

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