Simultaneous measurements of speciated, total reactive nitrogen (NO y ) and particulate NO 3 À (particle diameter <1.3 mm) were made on board the NASA P-3B aircraft over the western Pacific in February-April 2001 during the Transport and Chemical Evolution over the Pacific (TRACE-P) experiment. Gas-phase and particulate NO y was measured using a gold tube catalytic converter. For the interpretation of particulate NO y , conversion efficiencies of particulate NH 4 NO 3 , KNO 3 , NaNO 3 , and Ca(NO 3 ) 2 we…
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