Constraints on ozone removal by land and implications for 21st Century ozone pollution
Constraints on ozone removal by land and implications for 21st Century ozone pollution
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陆地臭氧清除的制约因素及其对 21 世纪臭氧污染的影响
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
O. Clifton
中科院分区：
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作者：
O. Clifton
臭氧干沉降是对流层臭氧的一个重要汇，但目前大尺度大气化学模式对臭氧干沉降的描述较为粗糙，影响了对对流层臭氧干沉降对臭氧污染影响的认识。臭氧干沉降量的变化很大程度上受植物气孔吸收臭氧的控制。从一个最长的臭氧涡度协方差数据集的观测，我发现在非气孔臭氧干沉积的实质性变化，并确定个别沉积过程驱动观察到的变化。我将介绍这项工作，以及与一个新版本的NOAA GFDL化学气候模型，更明确地解决气孔和非气孔沉积过程，利用互动生物物理学的模型的土地组成部分。在这里，我指出臭氧污染的前体排放，气候和臭氧干沉降在21世纪世纪开始和结束时的变化的反应。我的工作强调，在强前体排放控制下，北方中纬度地区的高臭氧污染季节向冬季高峰转移，由于臭氧寿命长，冬季臭氧对臭氧干沉降敏感。对于夏季和冬季，我发现，忽略非气孔沉积的变化和对环境条件的依赖性可能会阻碍准确识别的过程中观察到的趋势和臭氧污染的变化。
Ozone dry deposition is an important sink of tropospheric ozone, but coarse representation in most large-scale atmospheric chemistry models hinders understanding of the influence of this sink on ozone pollution. Variations in ozone dry deposition are largely expected to be controlled by ozone uptake through plant stomata. With observations from one of the longest ozone eddy covariance datasets available, I find substantial variations in nonstomatal ozone dry deposition and identify the individual deposition processes driving observed variations. I will present on this work, as well as work with a new version of the NOAA GFDL chemistry-climate model that more explicitly resolves stomatal and nonstomatal deposition processes by leveraging the interactive biophysics of the land component of the model. Here I pinpoint the responses of ozone pollution to changes in precursor emissions, climate, and ozone dry deposition at the beginning and end of the 21st century. My work highlights that under strong precursor emission controls there is a shift in the high ozone pollution season over northern midlatitudes to a wintertime peak, and that wintertime ozone is sensitive to ozone dry deposition due to the long ozone lifetime. For both summer and winter, I find that neglecting variations in nonstomatal deposition and dependencies on environmental conditions may hinder accurate identification of the processes driving observed trends and variability in ozone pollution.