Temperature, salinity and transmissivity data from the Alpha Helix in the Arctic Ocean, 2000 - 2004 (NCEI Accession 0059005)
This is calibrated CTD downcast data from five Alpha Helix cruises:

HX235, 8/1/2000 - 9/30/2000
HX250, 9/1/2001 - 9/30/2001
HX260, 6/1/2002 - 6/30/2002
HX274, 6/1/2003 - 7/30/2003
HX290, 8/29/2004 - 9/6/2004