JpGU-AGU Joint Meeting 2017

講演情報

[EE]Eveningポスター発表

セッション記号 A (大気水圏科学) » A-AS 大気科学・気象学・大気環境

[A-AS09] [EE] 成層圏-対流圏相互作用 ―統一領域としての新しい視点―

2017年5月24日(水) 17:15 〜 18:30 ポスター会場 (国際展示場 7ホール)

[AAS09-P09] 航空機フラスコサンプリングに基づく日本‐欧州間の上部対流圏/下部成層圏における温室効果ガスの季節変動とトレンド

*澤 庸介1町田 敏暢2松枝 秀和1丹羽 洋介1坪井 一寛1勝又 啓一2梅澤 拓2江藤 仁樹3藤田 遼4後藤 大輔5森本 真司4青木 周司4 (1.気象研究所海洋・地球化学研究部、2.国立環境研究所、3.日本航空株式会社、4.東北大学、5.国立極地研究所)

キーワード:Greenhouse gases, Upper troposphere/Lower Stratosphere, Aircraft measurement

As part of the CONTRAIL project, we have conducted measurements of greenhouse gases (CO2, CH4, N2O, and SF6) by monthly air sampling in the upper troposphere/lowermost stratosphere (UT/LMS) onboard commercial airliners between Europe and Japan since April 2012. The observed mixing ratios showed sharp gradients around the dynamical tropopause defined by potential vorticity calculated from the meteorological reanalysis fields. In the UT north of 50 N, CH4 and SF6 were higher and seasonal phase of CO2 were earlier than in the lower latitudes. In the LMS up to potential temperature of 50 K above the tropopause, CH4, N2O, and SF6 exhibited seasonal variations with maxima in November/December and minima in April/May. The remarkable seasonal variation in the LMS is explained by the subsidence of air from the deeper stratosphere in spring and by the efficient flushing of the LMS with tropospheric air in autumn. We observed persistent increasing trends of the all greenhouse gases over the past 5 years both in the UT and LMS. Our measurements constitute a unique data set in the UT/LMS useful for investigating temporal and spatial variations of these radiatively and chemically important greenhouse gases.