P. Woods, B. Bell, C. Paton-Walsh, and T Gardiner (NPL) – Bruker 120M (0.004 cm-1 resolution) used for intercomparisons and campaigns.  Measurements were made from May to June 1995.

C. Ritter, R. Neuber, and M. Maturilli (AWI) – Multi-wavelength system (excimer and Nd:YAG) making winter aerosol and temperature measurements between 10 and 45 km since 1991.  A four-channel receiver was added in 1999 for tropospheric aerosol and water vapor measurements.

T. J. McGee (GSFC), L. Twigg (SSAI), and G. Sumnicht (SSAI) – The STROZ lidar retrieves ozone vertical profiles in the stratosphere from 10 to 50 km.  Temperature to ~80 km and aerosols (at 355 nm) to 35 km also are measured.  The instrument has also been modified to measure water vapor from near the ground to ~10 km.  As a mobile intercomparator, it has participated in an ozone intercomparison in Ny Ålesund in September 1997 and January – February 1998.

J. Notholt (U. Bremen) and O. Schrems (AWI) – Campaign operations in winter of 1993/94; permanent operation in winter/spring since 1995.  Participated in a ClO radiometer intercomparison at Ny Ålesund in spring 1997.  Intermittent data archived from 1995 to 2003 under previous PI (K. Kunzi).

A. Murk (U. Bern) - Operation of microwave radiometer MIAWARA-C  for water vapor in operation from September 2015-present in campaign mode.

J. Rosen (U. Wyoming) – Backscatter measurements of aerosol profiles available from 1996 to 2005.

M. Maturilli (AWI) – Cryogenic frost point sondes flown with a frequency ranging from every other month to twice per month.