TY - JOUR A1 - Vömel, H. A1 - Diaz, K. T1 - Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere JO - Atmos. Meas. Tech. J1 - AMT VL - 3 IS - 2 SP - 495 EP - 505 Y1 - 2010/04/29 PB - Copernicus Publications SN - 1867-8548 UR - http://www.atmos-meas-tech.net/3/495/2010/ L1 - http://www.atmos-meas-tech.net/3/495/2010/amt-3-495-2010.pdf DO - 10.5194/amt-3-495-2010 ER -