New Atmospheric O-2/N-2 Ratio Measurements over the Western North Pacific Using a Cargo Aircraft C-130H

作者：Ishidoya Shigeyuki^*; Tsuboi Kazuhiro; Matsueda Hidekazu; Murayama Shohei; Taguchi Shoichi; Sawa Yousuke; Niwa Yosuke; Saito Kazuyuki; Tsuji Kentaro; Nishi Hidehiro; Baba Yusuke; Takatsuji Shinya; Dehara Koshiro; Fujiwara Hiroaki

来源：SOLA, 2014, 10(0): 23-28.

DOI：10.2151/sola.2014-006

Air samples collected over the western North Pacific using a cargo aircraft C-130H have been analyzed for O-2/N-2 ratio (delta(O-2/N-2)), Ar/N-2 ratio (delta(Ar/N-2)), delta N-15 of N-2, delta O-18 of O-2 and delta Ar-40 since May 2012. The relationships of delta(Ar/N-2), delta O-18 and delta Ar-40 with delta N-15 indicate a significant artificial fractionation due to thermal diffusion during the air sample collection. The observed delta(O-2/N-2) and the atmospheric potential oxygen (APO = O-2 + 1.1 x CO2), corrected for the artificial fractionation, show clear seasonal cycles at all altitudes over Minamitorishima, with amplitudes decreasing with height. Both the seasonal amplitude of the mid-tropospheric APO and its ratio to the surface value are found to decrease significantly from the mid-latitude to the subtropical region. The amplitude of the mid-tropospheric CO2 seasonal cycle does not change significantly meridionally in a latitude band.

• 出版日期2014
• 单位中国气象科学研究院