PT Journal AU Makarova, MV Kirner, O Timofeev, Y Poberovskii, AV Imkhasin, K Osipov, SI Makarov, BK TI Annual cycle and long-term trend of the methane total column in the atmosphere over the St. Petersburg region SO Izvestiya / Atmospheric and oceanic physics PY 2015 BP 431 EP 438 VL 51 IS 4 DI 10.1134/S0001433815040088 LA english ER