A new method for continuous measurements of oceanic and atmospheric N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O, CO and CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;: performance of off-axis integrated cavity output spectroscopy (OA-ICOS) coupled to non-dispersive infrared detection (NDIR)