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CMEMS In Situ TAC portfolio development 
1.1 Main developments in the operational In Situ 
TAC Infrastructure 
1.1.1 From a prototype to a fully operational service 
Over the period 2015-2021, in a coordinated effort, production 
units have significantly improved their procedures and tools 
thanks to Key Performance Indicators (KPI) displayed on the 
in situ marine website and to the file format checker useful to 
monitor the production. In collaboration with the Central 
Service Desk, users are informed, as soon as possible, of 
every event that may affect them: incidents, planned service 
Jutages and planned improvements of products. 
Additionally, InSitu TAC has also significantly Improved the 
number of platforms and the number of data providers 
chat allowed the integration of more data and then the 
Jdensifying of the in situ products. This way, historical data 
Japs (both in space and in time) are being filled as much as 
possible. This work on data ingestion and integration is 
possible thanks to In Situ TAC implication in and 
collaboration with many programmes and projects at 
European and international levels. For some areas, 
conditions for data collection are challenging (Arctic Ocean, 
Black Sea, Southern Ocean...) due to environmental 
difficulties to set up and maintain observing systems or 
complicated collaboration with surrounding countries. 
Despite the efforts already done this is a never-ending 
ljournev that we plan to carry on in the future. 
In addition to iImprovements done on regional multiparameter 
NRT products, a particular effort has also been put on REP 
products by topic: Temperature & Salinity, Waves, Currents, 
BioGeoChemistry, Carbon. These products are now updated 
twice a year, with a 6-month temporal extension, one of the 2 
updates also being a full reprocessing of product timeseries. 
1.1.2 Main technical improvements 
Over the past six years, In Situ TAC product files have 
improved radically with enhanced format, higher quality 
zontent, wider visibility and FAIR metadata following 
international rules and Copernicus Marine Service ones 
In 2019, files migrated from NetCDF3 to NetCDF4 (greater 
zompression, no more 2Go size limit, richer and FAIR 
global discovery and variable attributes). Along with this 
migration, stricter and exhaustive format and content 
zontrols were introduced. The file format checker and the 
file content checker was routinely applied on 700,000 
NetCDF files. These routines ensure that requirements 
“rom “"Copernicus Marine In Situ Net€DF_ Format Manual” 
and “System Requirements Document” are met. The 
NetCDF format manual is regularly updated to address 
specificities from new providers, platforms and metadata. 
Moreover, there is a continuous action to homogenise data: 
list of parameters, list of possible attributes, operation 
procedures.