[MIS10-P13] Temporal and spatial variability of atmosphere and ocean in the Southern Ocean
Keywords:Westerly Wind, DPOI, Air-Sea interaction
The leading mode, derived from the empirical orthogonal function (EOF) analysis for the monthly-mean zonal wind field, has a contribution of 55.5% with maxima on the Drake Passage. The score of this mode has a high correlation with the DPOI (0.94), so is related to the DPOI. Its spectrum has significant peaks at the periods of 6-month and 12-months, and another peak at the periods of 30-months. We focus on variabilities with time scales of about 3 years. To examine relationship between the DPOI-related surface wind and SST over the SO, we derive time series of the score of the 1st EOF mode for the zonal wind which are band-pass filtered for periods around 3 years, and examine its spatial correlations with the SST field. Results reveal that high correlations are found over the entire SO region. Spatial correlations indicate that there are negative areas to the west of the Drake Passage and positive ones to the east of it, and maxima in the Ross and Weddell seas. Relationships will be examined between surface wind and SST fields in these regions in detail.