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contributor authorGasparin, Florent
contributor authorRoemmich, Dean
contributor authorGilson, John
contributor authorCornuelle, Bruce
date accessioned2017-06-09T17:26:06Z
date available2017-06-09T17:26:06Z
date copyright2015/09/01
date issued2015
identifier issn0739-0572
identifier otherams-85203.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4228625
description abstractsing more than 10 years of Argo temperature and salinity profiles (2004?14), a new optimal interpolation (OI) of the upper ocean in the equatorial Pacific is presented. Following Roemmich and Gilson?s procedures, which were formulated for describing monthly large-scale anomalies, here every 5 days anomaly fields are constructed with improvements in the OI spatial covariance function and by including the time domain. The comparison of Argo maps with independent observations, from the TAO/TRITON array, and with satellite sea surface height (SSH), demonstrates that Argo is able to represent around 70%?80% of the variance at intraseasonal time scales (periods of 20?100 days) and more than 90% of the variance for the seasonal-to-longer-term variability. The RMS difference between Argo and TAO/TRITON temperatures is lower than 1°C and is around 1.5 cm when the Argo steric height is compared to SSH. This study also assesses the efficacy of different observing system components and combinations, such as SSH, TAO/TRITON, and Argo, for estimating subsurface temperature. Salinity investigations demonstrate its critical importance for density near the surface in the western Pacific. Objective error estimates from the OI are used to evaluate different sampling strategies, such as the recent deployment of 41 Argo floats along the Pacific equator. Argo?s high spatial resolution compared with that of the moored array makes it better suited for studying spatial patterns of variability and propagation on intraseasonal and longer periods, but it is less well suited for studying variability on periods shorter than 20 days at point locations. This work is a step toward better utilization of existing datasets, including Argo, and toward redesigning the Tropical Pacific Observing System.
publisherAmerican Meteorological Society
titleAssessment of the Upper-Ocean Observing System in the Equatorial Pacific: The Role of Argo in Resolving Intraseasonal to Interannual Variability
typeJournal Paper
journal volume32
journal issue9
journal titleJournal of Atmospheric and Oceanic Technology
identifier doi10.1175/JTECH-D-14-00218.1
journal fristpage1668
journal lastpage1688
treeJournal of Atmospheric and Oceanic Technology:;2015:;volume( 032 ):;issue: 009
contenttypeFulltext


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