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.  Current funding enables operations through to spring 2021 but mid-IR measurements are on hold as of April 2020 due to COVID-19 travel restrictions.

T. Nagai (MRI) and O. Uchino (MRI) – Nd:YAG Lidar (1064 and 532 nm; dual polarization) deployed in February 1993. Operations were winter only. Operations were expanded to allow for tropospheric retrievals. Operations suspended after spring 2002. Data exist in the database for the two winters spanning 1993 – 1995.

K. Strong (U. Toronto) – Stratospheric Ozone Lidar system (SOLID) deployed in February 1993 under PI A. Carswell. Nighttime operations only. SOLID has five detection channels: two Rayleigh channels for stratospheric ozone and temperature (308 and 353 nm), two Raman channels to improve the ozone and temperature profiles in the presence of aerosols (332 and 385 nm, installed in 1994), and one 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 K. Strawbridge. Operation suspended for 2010-2016 due to technical and funding issues. Operations resumed under PI J. Drummond since 2017 on the ~4-6 week period leading up to polar sunrise in January-March and ~2 week period in October-November. Since 2020 the PI of SOLID and PEARL is Kimberly Strong (University of Toronto).

Early data exist in the database for 1993-1998 and 2004-2009 in NASA Ames format. Since 2017 the data are submitted in HDF format.

D. Tarasick (EC) – ECC sondes launched once per week year-round beginning in November 1992, with two additional soundings per week in winter. NDACC data archiving began in 1996 under PI, Fast. Launches are currently taking place at the nearby Eureka weather station (79.99?N, 85.90?W, 10 masl).