气候变化领域集成服务门户(CCPortal): Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere

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DOI	10.5194/acp-22-3967-2022
	Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere
	Martinsson, Bengt G.; Friberg, Johan; Sandvik, Oscar S.; Sporre, Moa K.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	3967
结束页码	3984
卷号	22 期号:6 页码:18
英文摘要	Smoke from western North American wildfires reached the stratosphere in large amounts in August 2017. Limb-oriented satellite-based sensors are commonly used for studies of wildfire aerosol injected into the stratosphere (OMPS-LP (Ozone Mapping and Profiler Suite Limb Profiler) and SAGE III/ISS (Stratospheric Aerosol and Gas Experiment III on the International Space Station)). We find that these methods are inadequate for studies of the first 1-2 months after such a strong fire event due to event termination (saturation). The nadir-viewing lidar CALIOP (Cloud-Aerosol LIdar with Orthogonal Polarization) is less affected due to shorter path in the smoke; furthermore, it provides a means to develop a method to correct for strong attenuation of the signal. After the initial phase, the aerosol optical depth (AOD) from OMPS-LP and CALIOP show very good agreement above the 380 K isentrope, whereas OMPS-LP tends to produce higher AOD than CALIOP in the lowermost stratosphere (LMS), probably due to reduced sensitivity at altitudes below 17 km. Time series from CALIOP of attenuation-corrected stratospheric AOD of wildfire smoke show an exponential decline during the first month after the fire, which coincides with highly significant changes in the wildfire aerosol optical properties. The AOD decline is verified by the evolution of the smoke layer composition, comparing the aerosol scattering ratio (CALIOP) to the water vapor concentration from MLS (Microwave Limb Sounder). Initially the stratospheric wildfire smoke AOD is comparable with the most important volcanic eruptions during the last 25 years. Wildfire aerosol declines much faster, 80 %-90 % of the AOD is removed with a half-life of approximately 10 d. We hypothesize that this dramatic decline is caused by photolytic loss. This process is rarely observed in the atmosphere. However, in the stratosphere this process can be studied with practically no influence from wet deposition, in contrast to the troposphere where this is the main removal path of submicron aerosol particles. Despite the loss, the aerosol particles from wildfire smoke in the stratosphere are relevant for the climate.
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:000776518300001
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/273588
作者单位	Lund University
推荐引用方式 GB/T 7714	Martinsson, Bengt G.,Friberg, Johan,Sandvik, Oscar S.,et al. Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere[J],2022,22(6):18.
APA	Martinsson, Bengt G.,Friberg, Johan,Sandvik, Oscar S.,&Sporre, Moa K..(2022).Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(6),18.
MLA	Martinsson, Bengt G.,et al."Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.6(2022):18.