Analysis of spatiotemporal variations of mixed layer depth and barrier layer thickness in the global ocean
In this paper,the mixed layer depth(MLD)and barrier layer thickness(BLT)are calculated using the threshold method,based on in-situ ocean temperature and salinity measurements of the Argo profiles during 2002-2019.Different thresholds of ΔT1=0.2 ℃ and ΔT2=0.5℃,as well as different judgement rules,i.e.ocean temperature alone,ocean density alone,ocean temperature and density together,are involved in the calculation,and the differences in the MLD and BLT characteristics arose from different thresholds are described.The results show that the MLD judged by temperature and density together are more reliable than those judged by temperature alone or density alone,regardless of the threshold using ΔT1orΔT2.Both the MLD judged by temperature alone(MLDT)and density alone(MLDD)can reflect the spatial characteristics of the MLD in the global ocean to a certain extent.The MLDT and MLDD are in good agreement with each other in the equatorial and low-latitude oceans,while divergent largely in the high-latitude oceans.The correlation of the derived MLD using the threshold of ΔT2=0.5 ℃ is higher than that using the threshold of ΔT1=0.2 ℃ with respect to other existing MLD data,but the former has a larger root-mean-square error than the latter,probably due to regional suitability of the selected threshold.The spatial characteristics of the BLT are significantly different in different ocean areas.In general,the BLT has a relative large value in the high-latitude oceans,and decreases equatorward.
global oceanmixing layer depthbarrier layer thicknesstemporal and spatial characteristics
万方数据
维普
