The occurrence and distribution of Dechloranes were investigated in the southeast Tibetan Plateau (TP).
DP concentration in southeast TP was much higher than those in moss from the Arctic region.
Different altitudinal patterns between DP and Dec 602 were identified.
Decs are prone to undergo LRAT and cold-trapping by the mountains in the southeast TP. Keywords: Dechlorane plus Tibetan plateau Long-range atmospheric transport (LRAT) Lichen.