• T4.1: Review existing instrument operation methods, identify pathways for harmonising them, and make recommendations for improved methods and procedures. Identify institutions that could serve as national point-of-contact.
• T4.2: Coordinate the development of algorithms (to retrieve physical ABL properties) that can be applied across measurement networks.
• T4.3: Promote investigation of new technologies and implementation of hardware and software upgrades..

D4.1: Recommendations for configuration, operation, calibration, quality control.

D4.2: Delivery of algorithms or codes to produce level1 and level2 data products, handling manufacturer and generation heterogeneity with uniform metadata.

D4.3: Report on instrument field tests and investigations.