Consistency and quality assessment of the Metop-A/IASI and Metop-B/IASI operational trace gas products (O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;, CO, N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O, CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;, and CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;) in the subtropical North Atlantic
Atmospheric measurement techniques