Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 27, Issue 22, Pages 3723-3726Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2000GL011941
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The response of an intermediate coupled model of the: tropical Pacific to different forms of stochastic wind forcing is studied. An estimate of observed Pacific wind variance that is unrelated to Pacific sea surface temperature (SST) has a red spectrum, inconsistent with standard definitions of weather noise. The reddening is likely due to SST outside the basin; we propose a definition of climate noise for such reddened variance. Effects are compared for (i) red climate noise; (ii) the corresponding white weather noise estimate; (iii) intraseasonal and interannual components of the white noise (to test frequency response); and (iv) a noise product with Extra power in the 30-60 day range. Power is not effectively channeled from subannual frequencies to the frequencies associated with ENSO in this model. This suggests that ENSO impacts of the Madden-Julian oscillation are largely restricted to the low-frequency tail rather than the 30-60 day spectral peak. Interannual climate noise originating outside the tropical Pacific appears important.
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