Links between intraseasonal (extended MJO) and ENSO timescales: Insights via geodetic and atmospheric analysis

Details Links between intraseasonal (extended MJO) and ENSO timescales: Insights via geodetic and atmospheric analysis Links between intraseasonal (extended MJO) and ENSO timescales: Insights via geodetic and atmospheric analysis

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3465m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 18, p. 3465-3468

Physics

2

Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions, Geodesy And Gravity: Rotational Variations, Oceanography: General: Climate And Interannual Variability, Oceanography: Physical: El Nino

Scientific paper

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.

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