Stratospheric BrO profiles measured at different latitudes and seasons: Atmospheric observations
Stratospheric BrO profiles measured at different latitudes and seasons: Atmospheric observations
复制标题
不同纬度和季节测量的平流层 BrO 剖面：大气观测
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Pfeilsticker
中科院分区：
文献类型：
--
作者：
H. Harder;C. Camy‐Peyret;F. Ferlemann;R. Fitzenberger;Dr. Tom Hawat;H. Osterkamp;M. Schneider;D. Perner;U. Platt;P. Vradelis;K. Pfeilsticker
1996/97年，在LPMA/DOAS气球吊舱的三次飞行期间（LPMA/Physique Moleculaire et Application和DOAS/差分光学吸收光谱法），在不同纬度和不同季节测量了平流层BrO剖面。使用直射阳光DOAS光谱法测量了以下BrO混合比;（1）20至30公里高度范围内9至14 ppt（2）在30.6km、30.0km和39.8km的气球漂浮高度以上，上升过程中的平均温度约为（14±2）ppt，（3）日落时20-30 km范围内5 ~ 10 ppt。较低的BrO浓度在日落期间比以前在白天观察到的表示转换的BrO到夜间水库物种（BrONO 2，HOBr，和BrCl）。我们的紫外光谱BrO配置文件与最近的测量使用化学转换/共振荧光技术的总体协议是好的。我们的BrO配置文件也在合理的协议，目前平流层的Bry负担和化学。然而，相反配置的地面和卫星柱测量显示，大气中的BrO总量（50-100%）明显高于平流层BrO气球剖面所能解释的。这表明全球对流层BrO背景，估计为1-2 ppt。
Stratospheric BrO profiles were measured at different latitudes and in different seasons in 1996/97 during three flights of the LPMA/DOAS balloon gondola (LPMA/Laboratoire Physique Moléculaire et Application and DOAS/Differential Optical Absorption Spectrometry). Using direct sunlight DOAS spectrometry the following BrO mixing ratios were measured; (1) 9 to 14 ppt in the height range from 20 to 30 km (at solar zenith angles, SZA < 88°) during ascent, (2) about (14±2) ppt for altitudes above the balloon float altitude at 30.6 km, 30.0 km, and 39.8 km, and (3) 5 to 10 ppt in the 20–30 km region during sunset. The lower BrO concentrations during sunset than those observed prior at daytime indicate a conversion of BrO into nighttime reservoir species (BrONO2, HOBr, and BrCl). The overall agreement of our UV spectroscopic BrO profiles with recent measurements using the chemical conversion/resonance fluorescence technique is good. Our BrO profiles are also in reasonable agreement with the present stratospheric Bry burden and chemistry. Conversily collocated ground‐based and satellite column measurements, however, show significantly more total atmospheric BrO (50–100%) than the integrated stratospheric BrO balloon profiles can account for. This indicates a global tropospheric BrO background, estimated at 1–2 ppt.