Dynamical adjustment of quasi-synoptic data sets in the Eastern Mediterranean: testing a full basin coastal methodology

Golnaraghi, Maryam; Lozano, Carlos J.; Robinson, Allan R.

doi:10.1016/0924-7963(94)00035-2

Cited by 1 publication

(1 citation statement)

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“…It is first worthwhile to mention that the terminology 'quasi-synoptic' or 'nonsynoptic data set' is used in several publications (e.g. Golnaraghi et al, 1996;Viúdez et al, 1996), pointing out the fact that, apart from mapping errors arising from poor-resolution samplings, some error contributions from space/time smearing of the ocean dynamics are also expected in the analysis. Matthews (1997) examines the impact of nonsynoptic sampling on mesoscale oceanographic surveys with towed instruments by using an isopycnal model: temporal changes in the model lead to a 40-50% increase in the RMS errors compared to those due to the spatial separation of the sampling points.…”

Section: Introductionmentioning

confidence: 99%

A synopticity test of a sampling pattern in the Alboran Sea

Rixen¹,

Beckers²

2002

Journal of Marine Systems

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Hydrographic surveys are usually considered as synoptic, as if the corresponding data set had been sampled at the same time. However, this assumption might lead to strong biases in subsequent analyses. To obtain synoptic data at a given moment, we integrate a Lagrangian motion equation towards a 'modal sampling time', to relocate the sampling stations both in time and space, by combining objective analysis and geostrophic velocities, assumed to be either stationary or unstationary over the period of integration. The relocation algorithms are applied to a data set covering the entire Alboran Sea. The relocation of data points leads to a significant change on vertical velocities computed with the OMEGA equation. For validation purpose, the algorithm is also applied to a synthetic data set obtained from a 3D Primitive Equation (PE) model output. Raw and pseudosynoptic analysed temperature -salinity (T/S) fields and derived quasigeostrophic (QG) vertical velocities are compared. It is shown that the relocation method might correct significantly the errors arising from the synopticity hypothesis and that the sensitivity to the level of no-motion and the analysis parameters is less important than the nonsynopticity. D

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Section: Introductionmentioning

confidence: 99%