气候变化领域集成服务门户(CCPortal): Radiative impact of improved global parameterisations of oceanic dry deposition of ozone and lightning-generated NOx

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DOI	10.5194/acp-22-13013-2022
	Radiative impact of improved global parameterisations of oceanic dry deposition of ozone and lightning-generated NOx
	Luhar, Ashok K.; Galbally, Ian E.; Woodhouse, Matthew T.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13013
结束页码	13033
卷号	22 期号:19 页码:21
英文摘要	We investigated the radiative impact of recent process-based improvements to oceanic ozone (O-3) dry deposition parameterisation and empirical improvements to lightning-generated oxides of nitrogen (LNOx) parameterisation by conducting a 5-year simulation of the Australian Community Climate and Earth System Simulator - United Kingdom Chemistry and Aerosol (ACCESS-UKCA) global chemistry-climate model, with radiative effects of O-3, methane (CH4) and aerosol included. Compared to the base parameterisations, the global consequences of the two improved parameterisations on atmospheric composition are dominated by the LNOx change (which increases the LNOx production from 4.8 to 6.9 Tg N yr(-1)) and include (a) an increase in the O-3 column of 3.75 DU, and this O-3 change is centred on the tropical upper troposphere where O-3 is most effective as a radiative forcer; (b) a decrease of 0.64 years in the atmospheric lifetime of CH4 due to an increase in hydroxyl radical, which corresponds to a decrease of 0.31 years in the CH4 lifetime per Tg N yr(-1) change in LNOx ; (c) an increase of 6.7 % in the column integrated condensation nuclei concentration; and (d) a slight increase in high-level cloud cover. The two combined parameterisation changes cause an increase of 86.3 mW M-2 in the globally-averaged all-sky net downward top-of-atmosphere (TOA) radiative flux (which is akin to instantaneous radiative forcing), and only 5 % of which is due to the dry deposition parameterisation change. Other global radiative changes from the use of the two parameterisations together include an increase in the downward longwave radiation and a decrease in the downward shortwave radiation at the earth's surface. The indirect effect of LNOx on aerosol and cloud cover can at least partly explain the differences in the downward shortwave flux at the surface. It is demonstrated that although the total global LNOx production may be the same, how LNOx is distributed spatially makes a difference to radiative transfer. We estimate that for a reported uncertainty range of 5 +/- 3 Tg N yr(-1) in global estimates of LNOx, the uncertainty in the net downward TOA radiation is +/- 119 mW m(-2). The corresponding uncertainly in the atmospheric methane lifetime is +/- 0.92 years. Thus, the value of LNOx used within a model will influence the effective radiative forcing (ERF) and global warming potential (GWP) of anthropogenic CH4, and influence the results of climate scenario modelling.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000865757000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273573
作者单位	Commonwealth Scientific & Industrial Research Organisation (CSIRO)
推荐引用方式 GB/T 7714	Luhar, Ashok K.,Galbally, Ian E.,Woodhouse, Matthew T.. Radiative impact of improved global parameterisations of oceanic dry deposition of ozone and lightning-generated NOx[J],2022,22(19):21.
APA	Luhar, Ashok K.,Galbally, Ian E.,&Woodhouse, Matthew T..(2022).Radiative impact of improved global parameterisations of oceanic dry deposition of ozone and lightning-generated NOx.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(19),21.
MLA	Luhar, Ashok K.,et al."Radiative impact of improved global parameterisations of oceanic dry deposition of ozone and lightning-generated NOx".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.19(2022):21.