Climatology and atmospheric chemistry of the non-methane hydrocarbons ethane and propane over the North Atlantic oleh Detlev Helmig, Mauricio Muoz, Jacques Hueber, Claudio Mazzoleni, Lynn Mazzoleni, Robert C. Owen, Maria Val-Martin, Paulo Fialho, Christian Plass-Duelmer, Paul I. Palmer, Alastair C. Lewis, Gabriele Pfister