“…Since its first detection in the near infrared (Spinrad et al, 1963) water vapour in the Martian atmosphere has been extensively studied by ground-based and space borne observations (e.g. Sprague, et al 1996, Burgdorf, et al 2000, Gurwell, et al 2000, Smith 2002Biver, et al 2005, Fouchet, 2007, Encrenaz et al, 2008and Smith et al, 2009. Compared to water, there is only a sparse database for carbon monoxide at Mars.…”