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Links between intraseasonal (extended MJO) and ENSO timescales: Insights via geodetic and atmospheric analysis
Author(s) -
Marcus Steven L.,
Dickey Jean O.,
Viron Olivier
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013434
Subject(s) - madden–julian oscillation , climatology , amplitude , wind stress , el niño southern oscillation , environmental science , atmospheric sciences , residual , momentum (technical analysis) , coherence (philosophical gambling strategy) , geology , meteorology , physics , mathematics , convection , finance , algorithm , quantum mechanics , economics
The relationship of intraseasonal variability to ENSO is investigated using daily length‐of‐day (LOD), atmospheric angular momentum (AAM), west equatorial Pacific (WPAC) wind stress and monthly Nino3 SST data for the years 1976–1999. Strong coherence is found for LOD, AAM, and their residual (representative of oceanic angular momentum and / or unmodeled/underrepresented atmospheric variability) with the regional wind stress at periods near 75 days, a preferred time scale for WPAC Kelvin wave generation. Amplitude envelopes of LOD and AAM filtered at similar periods (60–100 days) are significantly correlated with Nino3 anomalies at an SST lag of 8 months; the LOD‐AAM residual correlates at a shorter lag (5 months), with the difference representing an oceanic spin‐up time. No significant correlations are found using a band (36–60 days) typifying the global Madden‐Julian Oscillation, accounting for the lack of previous MJO‐ENSO correlations in the literature.