H. Fast (EC) and K. Shibata and Y. Makino (MRI) – Bomem DA8 system (0.004 cm-1 resolution) deployed in February 1993 and removed in February 2009. Intercompared with NPL mobile instrument in spring 1999. Data archived for the winters of 1996- 2000 and 2003-2006.

J. Drummond and A. Tikhomirov (Dalhousie U.) – DIAL system deployed in February 1993 for winter season, nighttime only operations. Operation suspended for 2002 and 2003. Operations resumed in 2004-2009 on a campaign basis schedule (~2 weeks in February-March). Operation suspended for 2010-2016 due to technical and funding issues. Operations resumed since 2017 on the approximately 4-6 week period leading up to polar sunrise in January-March and ~2 week period in October-November. The system has five detection channels: 2 Rayleigh channels (308 and 353 nm), 2 Raman channels to improve the ozone profile in the presence of aerosols (332 and 385 nm), and 1 Raman channel for water vapor (405 nm). Funding is currently in place for operations through to 2019.   Early data exist in the database under PI Carswell for 1993-1998 and resumed under PI Strawbridge for 2004-2009 and under PI Drummond since 2017. 

Carswell (EC) – DIAL system (XeCl excimer laser similar to that at Toronto: 43.66˚N, 79.40˚W) deployed in February 1993 for winter season, nighttime only operations. Operation suspended after spring 2002. Data exists in the database for winters 1994 to 1998.