TY - JOUR A1 - Alexander, P. A1 - de la Torre, A. A1 - Llamedo, P. A1 - Hierro, R. A1 - Schmidt, T. A1 - Haser, A. A1 - Wickert, J. T1 - A method to improve the determination of wave perturbations close to the tropopause by using a digital filter JO - Atmos. Meas. Tech. J1 - AMT VL - 4 IS - 9 SP - 1777 EP - 1784 Y1 - 2011/09/08 PB - Copernicus Publications SN - 1867-8548 UR - https://amt.copernicus.org/articles/4/1777/2011/ L1 - https://amt.copernicus.org/articles/4/1777/2011/amt-4-1777-2011.pdf DO - 10.5194/amt-4-1777-2011 ER -