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gfdl on-line bibliography > forthcoming citations
Objective analysis of monthly temperature and salinity for the world ocean in the 21st Century: Comparison with WOA and application to assimilation model
| Chang, Y.-S., A. Rosati, S.Zhang, and M. J. Harrison, 2008: Objective analysis of monthly temperature and salinity for the world ocean in the 21st Century: Comparison with WOA and application to assimilation model. Journal of Geophysical Research (Oceans). 6/08. |
| Abstract: A new world ocean atlas of monthly temperature and salinity based on individual profiles for 2003-2007 (WOA21c) is constructed and compared with World Ocean Atlas 2001 (WOA01), World Ocean Atlas 2005 (WOA05) and the data assimilation results from the Coupled Data Assimilation (CDA) system developed by the Geophysical Fluid Dynamics Laboratory (GFDL). First, we established a global data management system for quality control (QC) of oceanic observed data both in real time and delayed mode. Delayed mode QC of Argo floats indentified about 8.5% (3%) of the total floats (profiles) up to December 2007 as having significant salinity offset of more than 0.05 psu. Second, all QCed data were gridded at 1° by 1° horizontal resolution and 23 standard depth levels using six spatial scales (large and small longitudinal, latitudinal, and cross-isobath) and a temporal scale. Analyzed mean temperature in WOA21c is warm with respect to WOA01 and WOA05, while salinity difference is less evident. Consistent difference among WOA01, WOA05, and WOA21c is found both in fully and sub-sampled dataset, which indicates a large impact of recent observation on the existing climatology. Root mean square temperature and salinity difference and offset of the GFDL’s CDA results significantly decrease in the order of WOA01, WOA05, and WOA21c in all oceans and depths as well. This result suggests that the WOA21c is of use for the collocated assessment approach especially for high-performance assimilation models on the global scale. |