Stability of organic nitrogen in NADP wet deposition samples

► Wet deposition measurement of organic nitrogen (ON) requires chilling of samples upon collection. ► ON loss in NADP AIRMoN daily wet deposition samples is ≈11% as compared to refrigerated collector. ► ON loss in unfiltered NADP NTN weekly wet deposition samples is ≈40%. ► Biases in ON are more consistently negative at higher ambient temperatures.