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Spring Cold Bias of SST and minimal wind mixing in the Equatorial Pacific Cold Tongue

MPG-Autoren
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Li,  Chao       
External Author, MPI for Meteorology, Max Planck Society;

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Zitation

Lin, P.-F., Hai-Long, L., Li, C., & Xue-Hong, Z. (2010). Spring Cold Bias of SST and minimal wind mixing in the Equatorial Pacific Cold Tongue. Atmospheric and Oceanic Science Letters, 3, 342-346. doi:10.1080/16742834.2010.11446890.


Zitierlink: https://hdl.handle.net/21.11116/0000-0005-6CA1-C
Zusammenfassung
AbstractThe authors investigate the relationship between bias in simulated sea surface temperature (SST) in the equatorial eastern Pacific cold tongue during the boreal spring as simulated by an oceanic general circulation model (OGCM) and minimal wind mixing (MWM) at the surface. The cold bias of simulated SST is the greatest during the boreal spring, at approximately 3°C. A sensitivity experiment reducing MWM by one order of magnitude greatly alleviates cold biases, especially in March-April. The decrease in bias is primarily due to weakened vertical mixing, which preserves heat in the uppermost layer and results in warmer simulated SST. The reduction in vertical mixing also leads to a weak westward current in the upper layer, which further contributes to SST warming. These findings imply that there are large uncertainties about simple model parameters such as MWM at the oceanic surface.