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

本实验研究涉及大气溴化学。最近有报道称，二氧化溴（OBrO）作为主要的夜间溴物种存在于大气中，这意味着二氧化溴在夜间的化学作用可能很重要。OBrO自由基的化学命运和在大气中的作用尚未确定。初步模式模拟表明，OBrO与臭氧、一氧化氮和一氧化二氯的均相反应影响平流层臭氧收支和溴种分配，特别是在臭氧浓度最高的平流层低层。OBrO可能与极地平流层云（PSCs）有强烈的相互作用。在平流层条件下，将使用快速流动反应器与质谱联用测量OBrO与O3、NO、ClO和水冰相互作用的动力学速率参数。初步的实验室结果表明，在室温下，OBrO对NO的反应性是OClO的几倍。

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.