Enhanced tropospheric BrO concentrations over the Antarctic sea ice belt in mid winter observed from

• 作 者: T.Wagner[1]O.Ibrahim[2]R.Sinreich[2]U.Frie(β)[2]U.Platt[2]
• 机 构: Max-Planck-Institute for Chemistry,Becherweg 27,D-55128 Mainz,Germany
• 出 处: 第二届SOLAS国际开放科学大会
• 发表日期: 2007年期

　　We present Multi AXis-Differential Optical Absorption Spectroscopy (MAX-DOAS) observations of tropospheric BrO carried out on board the German research vessel Polarstern during the Antarctic winter 2006.Polarstern entered the area of first year sea ice around Antarctica on 24.06.2006 and stayed within this area until 15.08.2006.For the period when the ship cruised inside the first year sea ice belt,enhanced BrO concentrations were almost continuously observed.Before and after the period inside the first year sea ice belt,typically low BrO concentrations were observed.Our observations indicate that enhanced BrO concentrations around Antarctica exist about one month earlier than observed by satellite instruments.The small BrO concentrations over the open oceans indicate a short atmospheric lifetime of activated bromine without contact to areas of first year sea ice.From detailed radiative transfer simulations we find that MAX-DOAS observations are about one order of magnitude more sensitive to near-surface BrO compared to satellite observations.