Profile - multiple species

J. Hannigan and I. Ortega and M. Coffey (ret) (NCAR) – Bruker 120M (250cm OPD) installed at South Mountain in 1999 in bldg. 1985, operating under autonomous control. Instrument was moved to bldg. 1971 (1km from previous location at same altitude) in Summer 2011. In May 2015 a new Bruker 125HR FTIR (also 250cm OPD) operating with new software control and new solar tracker was installed.

J. Notholt and M. Palm (U. Bremen) — Bruker 120M (0.004 cm-1 resolution), deployed 1992 to 1995. Replaced by Bruker 120HR (0.0028 cm 1 resolution) in 1995. Operates all year with lunar (polar night) observations added since December 1992. Upgraded to 125 HR in 2012.

K. Strong (U. Toronto) — Bruker 125HR (operated at 257 cm OPD, 0.004 cm-1 resolution in the 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 Eureka Bomem DA8 FTIR were conducted prior to its removal in 2009: February to April 2007, July 2007, and February to April 2008. Alternating mid-infrared NDACC and near-infrared TCCON measurements have been made on a semi-daily basis since 2010. Operations in 2012 and 2013 were reduced due to funding. Operations since April 2020 have been severely affected by the lack of on-site support due to the COVID-19 pandemic, funding, and restricted access to the Ridge Lab, with NDACC MIR measurements currently limited to campaigns.