Laboratory Study of Atmospheric OBrO with 03, NO, ClO, and Ice in the Temperature Range of 220-350 K

本实验研究大气溴化学。最近有报道称，大气中的二氧化溴（OBrO）是一种主要的夜间溴物种，这意味着OBrO在夜间化学中可能发挥重要作用。OBrO自由基的化学归宿和大气作用尚未确定。初步的模型模拟表明，OBrO与臭氧，一氧化氮和一氧化氯的均匀反应影响平流层臭氧收支和溴物种的分区，特别是在平流层较低的臭氧浓度最大。OBrO可能与极地平流层云（PSC）发生强烈的相互作用。OBrO和O3，NO，ClO和水冰之间的相互作用的动力学速率参数将在平流层条件下使用一个快速流动反应器与质谱联用测量。初步的实验室结果表明，OBrO是几倍以上的反应比OClO对NO在室温下。

This experimental investigation addresses atmospheric bromine chemistry. Bromine dioxide, OBrO, has recently been reported to be present in the atmosphere as a principal night-time bromine species, implying a potentially important role for OBrO chemistry at night time. The chemical fate and atmospheric role of the OBrO radical have not been determined. Preliminary model simulations indicate that the homogeneous reactions of OBrO with ozone, nitric oxide, and chlorine monoxide affect the stratospheric ozone budget and bromine species partitioning, particularly in the lower stratosphere where ozone concentrations are greatest. It is possible that OBrO strongly interacts with polar stratospheric clouds (PSCs). Kinetic rate parameters for the interactions between OBrO and O3, NO, ClO and water-ice will be measured under stratospheric conditions using a fast flow reactor coupled with mass spectrometry. Preliminary laboratory results indicate that OBrO is several times more reactive than OClO towards NO at room temperature.