ATMOSPHERE: Surface-layer (it includes, e.g., the long-term buoy network, the Global GAW network (Barrow (USA), Sodankylä-Pallas (Finland) and Ny-Alesund (Norway)), the Regional GAW network (Shemya Island, Cold Bay, Poker flat, Ocean Station M (USA), Inuvik, Behchoko, Cambridge Bay, Baker Lake, Churchill, Snare Rapids, Resolute, Eureka, Iqualuit (Canada), Thule, Sondrestrom, Site J, Summit, Station North (Greenland), Reykjavik , Storhofdi, Irafoss (Iceland), Esrange, Tarfala, Luleå (Sweden), Oulanka, Varriö (Finland), Janiskoski, Teriberka, Arkhangelk, Pinega, Tiksi , Yakutsk, Murmansk, Pechora, Baranova, Turukhansk, Dikson Island, Tura, Olenek, Kotelnyj Island, Nagaevo, Markovo (Russia)), the Pan-Eurasian Experiment (PEEX) network; the Tower network for atmospheric trace gas mixing-ratio monitoring (e.g. CO2, CH4, N2O,. ..), or GCOS-affiliated WMO/GAW Global Atmospheric monitoring network (Barrow, CARVE tower Fairbanks (USA), Inuvik, Behchoko, Cambridge Bay, Baker Lake, Alert (Canada), Summit (Greenland), Storhovdi (Iceland), Zeppelin (Norway), Pallas (Finland), Kjolnes (Norway), Igrim, Noyabrsk, ZOTTO, Cape Baranova, Tiksi, Yakutsk, Pleistocene Park, Ambarchik (Russia)); the ICOS-Atmosphere network (Disko, Nuuk, Zackenberg, North (Greenland), Zeppelin (Ny Alesund, Norway), Abisko (Sweden), Pallas, Sodankylä (Finland))