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| Vialard, Jerome; Foltz, G. R.; Mcphaden, M. J.; Duvel, J. P.; De Boyer Montegut, Clement. |
| A moored buoy was recently deployed at 8 degrees S, 67 degrees E in the shallow thermocline region of the Indian Ocean known as "Seychelles-Chagos Thermocline Ridge'' (SCTR), where the Madden Julian Oscillation (MJO) is associated with strong sea surface temperature (SST) variability. We use observations from this mooring to describe the oceanic signature of two MJOs between November 2007 and February 2008. The four-month average upper ocean heat balance was largely between heating by atmospheric forcing (2.0 +/- 0.3 degrees C/month) and a significant cooling by subsurface processes (-2.2 +/- 0.8 degrees C/month), consistent with climatological Ekman pumping in the region. The two MJO events resulted in strong intraseasonal SST variations (1.5 to 2 degrees... |
| Tipo: Text |
Palavras-chave: Layer heat balance; Paific; Perturbations; Prediction; Fluxes. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00185/29636/27988.pdf |
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| DelSole, T.. |
| An optimal perturbation is an initial condition that optimizes amplitude growth over a prescribed time in a linear system. Previous studies have argued that optimal perturbations play an important role in turbulence. Two basic questions related to this theory are whether optimal perturbations necessarily grow in all turbulent background flows, and whether the turbulent flow necessarily excites optimal perturbations at the rate required to account for the observed eddy variance. This paper shows that both questions can be answered in the affirmative for statistically steady turbulence. The argument put forward here is independent of any closure theory of turbulence. In essence, the result follows from the fact that statistical equilibrium and conservation... |
| Tipo: Working Paper |
Palavras-chave: Perturbations. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/505 |
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