FN Archimer Export Format
PT Rapport
TI Argo Core and BGC merged profiles file processing and format on Coriolis GDAC
BT 
AS 1:;
FF 1:;
SI BREST
SE PDG-IMN-IDM-ISI
UR https://archimer.ifremer.fr/doc/00445/55638/57284.pdf
LA English
DT Report
AB In 2014, Argo data management team decided to split core-Argo profiles and non-core-Argo profiles into two distinct profile files (C-File and B-File). Both files have the same N_PROF dimension and, for each N_PROF, pressure values of the C-file are duplicated into the B-File. A core-Argo profile file (C-File) contains the Core parameters provided by a float: pressure, temperature, salinity and conductivity. The additional parameters are managed in a BGC-Argo data file (B-File). Two types of additional parameters are concerned: ‘intermediate’ parameters (provided by the float sensors) and BGC parameters (directly sampled by the float sensors or computed, at the DAC level, from Core and ‘intermediate’ parameters). For a given float cycle and direction, the merged profile combines into one merged file (M-File) the Core and the BGC parameters. The M-File is generated by the GDAC, from the C-File and B-File provided by the DACs. M-profile version 1 In version 1, the M-Profile is created from a concatenation of Core and BGC parameters (i.e. ‘intermediate’ parameters are ignored) along the common PRES axis of each N_PROF. Thus M-profile file has the same number of N_PROF arrays as the original C-File and B-File. M-profile version 2 In version 2, the M-Profile is the merging of all N_PROF arrays of M-Profile version 1 into a single one. Thus, in such M-Profile file: 	- N_PROF = 1 	- N_PARAM is equal to the number of Core and BGC parameters The standard Argo profile structure is still used in M-Profile file: measurements are stored in a(N_PROF, N_LEVELS) array. However, as N_PROF = 1, we can consider that measurements are reported in a simple “matrix” of N_PARAM * N_LEVELS dimension: one column for each Core and BGC parameter, one level for each valid distinct pressure. The PRES vertical synthetic axis contains the sorted set of all valid distinct pressures. A valid pressure has a QC flag of ‘1’, ‘2’, ‘5’ or ‘8’ (‘good’, ‘probably good’, ‘changed’ or ‘estimated’ value). The number of valid distinct pressures is equal to N_LEVELS. Each parameter value having a non-valid pressure is ignored. A pressure value may have more than one value for a parameter (for example, BGC sensors may report specific Core parameter values that has been used to compute reported BGC parameter values). If the parameter is a Core-parameter, the value of the Core profile is selected. Otherwise, the first value of an ordered set (see “N_PROF priority” below) of the original N_PROF arrays is selected. This document details the processing steps used to generate version 2 of merged profile data from Argo profile data. It also describes the format of the NetCDF files produced by the Coriolis GDAC to store these merged profile data. 
PY 2018
PD JUL
DI 10.13155/55638
ID 55638
ER

EF