TY - JOUR A1 - Salmi, S.-M. A1 - Verronen, P. T. A1 - Thölix, L. A1 - Kyrölä, E. A1 - Backman, L. A1 - Karpechko, A. Yu. A1 - Seppälä, A. T1 - Mesosphere-to-stratosphere descent of odd nitrogen in February–March 2009 after sudden stratospheric warming JO - Atmos. Chem. Phys. J1 - ACP VL - 11 IS - 10 SP - 4645 EP - 4655 Y1 - 2011/05/18 PB - Copernicus Publications SN - 1680-7324 UR - http://www.atmos-chem-phys.net/11/4645/2011/ L1 - http://www.atmos-chem-phys.net/11/4645/2011/acp-11-4645-2011.pdf DO - 10.5194/acp-11-4645-2011 ER -