K. Strong (U. Toronto) – Bruker 125HR (0.0027 cm-1 resolution, mid-infrared), installed in July 2006. Direct-sun solar absorption spectra are collected in a semi-automated operation on clear-sky days from polar sunrise (approx. February 20) until polar sunset (approx. October 20). Three intercomparison campaigns with the Bomem DA8 FTIR (see above entry) were conducted prior to the removal of the DA8: February to April 2007, February to April 2008, and July 2007. Alternating mid-infrared NDACC and near-infrared TCCON measurements on a semi-daily basis since 2010. Operations in 2012 and 2013 were affected by budget cuts. New funding has enabled operations through to 2019.

K. Strong (U. Toronto) – Stratospheric Ozone Differential Absorption Lidar system (DIAL) deployed in February 1993 under PI Carswell. Nighttime operations only. The DIAL has five detection channels: 2 Rayleigh channels for stratospheric ozone and temperature (308 and 353 nm), 2 Raman channels to improve the ozone profile in the presence of aerosols (332 and 385 nm, installed in 1994), and 1 Raman channel for water vapour (405 nm, installed in 1998). Operation suspended for 2002 and 2003. Operations resumed in 2004-2009 on a campaign basis schedule (~2 weeks in February-March) under PI Strawbridge. Operation suspended for 2010-2016 due to technical and funding issues. Operations resumed under PI Drummond since 2017 on the ~4-6 week period leading up to polar sunrise in January-March and ~2 week period in October-November. Early data exist in the database under PI Carswell for 1993-1998 and PI Strawbridge for 2004-2009 in AMES format. Since 2017 no new data have been submitted. Funding is currently in place for operations through to March 2020.

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.