Wet chemical surface ozone measurements during POLARSTERN cruise ARK-II/2 (PS05) in 1984@en

The 1st leg of the voyage was used for ship inspections off Labrador at 57.5°N (May 10-June 10); Stopover in Tromsø (June 10-12); the 2nd leg of the journey was in the Fram Strait. The sometimes very high ozone mixture ratios in the first part of the voyage are due to stratospheric intrusions, since according to the ship's weather station report there was a relatively stationary complex atmospheric low system off Newfoundland. This is favorable for the formation of tropopause folds. During the 2nd leg of the voyage, very low ozone mixture ratios were measured at times at 70°N, which were probably due to ozone depletion by bromine during sunny weather.本次航程的第一航段用于在北纬57.5°的拉布拉多近海开展船舶巡检（5月10日至6月10日）；中途经停特罗姆瑟（6月10日至12日）；航程第二航段位于弗拉姆海峡（Fram Strait）。 航程前半段偶尔出现的极高臭氧混合比，源于平流层空气侵入（stratospheric intrusions）。据船舶气象站观测报告，纽芬兰近海存在相对稳定的复杂大气低压系统，该系统有利于对流层顶折叠（tropopause folds）的形成，为平流层臭氧向对流层的输送创造了条件。在航程第二航段期间，北纬70°海域偶尔观测到极低的臭氧混合比，该现象大概率由晴朗天气下溴引发的臭氧消耗所致。