sampling distances obtained in this paper are conservative. The methodology in this paper is hopefully to applied on assimilated dataset from comprehensive atmosphere-ocean coupled GCMs.
As for OOSD by using observed datasets, the measurements with high spatial resolution are not available in the most of the sub-surface in the open ocean. The spatial resolution may not be high enough to estimate the length scales of high-passed SST with enough accuracy, as pointed by Kessler et al. (1997). In this case, the above methods can not be directly used to solve the OOSD problem and new approaches should be developed. This work is now in progress by using Empirical Orthogonal Function (EOF) analysis and low-resolution XBT datasets.
Acknowledgements. This work was supported by Japan STA Fellowship Program and tropical ocean observation program in JAMSTEC. Authors thank M. Spillane in PMEL for his introducing Reynolds SST used in this study. Thanks are also send to Masataka Hishida and Kei Muneyama in JAMSTEC and Shizuo Yamamoto in NASDA (Japan) for their generous support of this research.
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