Service Objective

Operational Need

The objective of OPAS SO2LH notification service is to provide SO2LH information in NRT. The SO2LH characterises the effective plume height of the SO2 layer related to a volcanic eruption. Note that the SO2 is a proxy for sulphide emissions, which can induce sulphidation inside engines and potentially conduct to an accident caused by engine failure and damage. The SO2LH is also a proxy for the volcanic ash height, which is notoriously difficult to measure. The SO2LH information are currently provided by 3 instruments (TROPOMI and IASI) respectively on board S5P, MetOp-A & MetOp-B POLAR_OPERATIONAL_ENVIRONMENTAL_SATELLITE.