Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere

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Fältnamn	Indikatorer	Metadata
000		04733naa a2200325 4500
001		oai:lup.lub.lu.se:b0c49d25-f9e1-4325-9c1c-60f4a58a7317
003		SwePub
008		220610s2022 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://lup.lub.lu.se/record/b0c49d25-f9e1-4325-9c1c-60f4a58a73172 URI
024	7	a https://doi.org/10.5194/acp-22-3967-20222 DOI
040		a (SwePub)lu
041		a engb eng
042		9 SwePub
072	7	a art2 swepub-publicationtype
072	7	a ref2 swepub-contenttype
100	1	a Martinsson, Bengt G.u Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH4 aut0 (Swepub:lu)nucl-bma
245	1 0	a Five-satellite-sensor study of the rapid decline of wildfire smoke in the stratosphere
264		c 2022-03-28
264	1	b Copernicus GmbH,c 2022
520		a 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 380ĝK isentrope, whereas OMPS-LP tends to produce higher AOD than CALIOP in the lowermost stratosphere (LMS), probably due to reduced sensitivity at altitudes below 17ĝkm. 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, 80ĝ%-90ĝ% of the AOD is removed with a half-life of approximately 10ĝd. 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.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Meteorologi och atmosfärforskning0 (SwePub)105082 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Meteorology and Atmospheric Sciences0 (SwePub)105082 hsv//eng
700	1	a Friberg, Johanu Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Environmental and Climate Science (CEC),Faculty of Science,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH4 aut0 (Swepub:lu)nucl-jfe
700	1	a Sandvik, Oscar S.u Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH4 aut0 (Swepub:lu)os2578el
700	1	a Sporre, Moa K.u Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH4 aut0 (Swepub:lu)nucl-mse
710	2	a Kärnfysikb Fysiska institutionen4 org
773	0	t Atmospheric Chemistry and Physicsd : Copernicus GmbHg 22:6, s. 3967-3984q 22:6<3967-3984x 1680-7316x 1680-7324
856	4	u http://dx.doi.org/10.5194/acp-22-3967-2022x freey FULLTEXT
856	4 8	u https://lup.lub.lu.se/record/b0c49d25-f9e1-4325-9c1c-60f4a58a7317
856	4 8	u https://doi.org/10.5194/acp-22-3967-2022

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Av författaren/redakt...: Martinsson, Beng ...; Friberg, Johan; Sandvik, Oscar S ...; Sporre, Moa K.

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