Exploiting the favourable alignment of CALIPSO's descending orbital tracks over Sweden to study aerosol characteristics

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Thomas, Manu AnnaSveriges meteorologiska och hydrologiska institut (SMHI),Swedish Meteorological and Hydrological Institute (SMHI) (author)

Exploiting the favourable alignment of CALIPSO's descending orbital tracks over Sweden to study aerosol characteristics

Article/chapterEnglish2013

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2013-01-01
Stockholm University Press,2013
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LIBRIS-ID:oai:research.chalmers.se:c009c5d6-398e-463e-be03-824539799119
https://research.chalmers.se/publication/186555URI
https://doi.org/10.3402/tellusb.v65i0.21155DOI
https://research.chalmers.se/publication/514370URI

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Language:English
Summary in:English

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One of the key knowledge gaps when estimating aerosol forcing and their role in air quality is our limited understanding of their vertical distribution. As an active lidar in space, the CALIOP-CALIPSO is helping to close this gap. The descending orbital track of CALIPSO follows elongated semi-major axis of Sweden, slicing its atmosphere every 2-3 d, thus providing a unique opportunity to characterise aerosols and their verticality in all seasons irrespective of solar conditions. This favourable orbital configuration of CALIPSO over Sweden is exploited in the present study. Using five years of night-time aerosol observations (2006-2011), we investigated the vertical distribution of aerosols. The role of temperature inversions and winds in governing this distribution is additionally investigated using collocated AIRS-Aqua and ERA-Interim Reanalysis data. It is found that the majority of aerosols (up to 70%) are located within 1 km above the surface in the lowermost troposphere, irrespective of the season. In summer, convection and stronger mixing lift aerosols to slightly higher levels, but their noticeable presence in the upper free troposphere is observed in the winter half of the year, when the boundary layer is decoupled due to strong temperature inversions separating local sources from the transport component. When southerly winds prevail, two or more aerosol layers are most frequent over southern Sweden and the polluted air masses have higher AOD values. The depolarisation ratio and integrated attenuated backscatter of these aerosol layers are also higher. About 30-50% of all aerosol layers are located below the level where temperature inversions peak. On the other hand, relatively cleaner conditions are observed when the winds have a northerly component.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
vertical distribution
aerosols
air quality
CALIPSO

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Devasthale, AbhaySveriges meteorologiska och hydrologiska institut (SMHI),Swedish Meteorological and Hydrological Institute (SMHI) (author)
Kahnert, Michael,1968Sveriges meteorologiska och hydrologiska institut (SMHI),Swedish Meteorological and Hydrological Institute (SMHI),Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kahnert (author)
Sveriges meteorologiska och hydrologiska institut (SMHI)Chalmers tekniska högskola (creator_code:org_t)

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In:Tellus, Series B: Chemical and Physical Meteorology: Stockholm University Press65:11600-08890280-6509

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