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<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACPD</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACPD</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7375</issn>
<publisher><publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acpd-9-27791-2009</article-id>
<title-group>
<article-title>Airborne measurements of aerosol optical properties related to  early spring transport of mid-latitude sources into the Arctic</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Adam de Villiers</surname>
<given-names>R.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ancellet</surname>
<given-names>G.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Pelon</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Quennehen</surname>
<given-names>B.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Scharwzenboeck</surname>
<given-names>A.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gayet</surname>
<given-names>J. F.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Law</surname>
<given-names>K. S.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>UPMC Univ. Paris 06, Université Versailles St-Quentin, CNRS/INSU, LATMOS-IPSL,  UMR 8190, France</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Laboratoire de Météorologie Physique, Université B. Pascal, CNRS, UMR 6016, France</addr-line>
</aff>
<pub-date pub-type="epub">
<day>23</day>
<month>12</month>
<year>2009</year>
</pub-date>
<volume>9</volume>
<issue>6</issue>
<fpage>27791</fpage>
<lpage>27836</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
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<abstract>
<p>Airborne lidar and in-situ measurements of the aerosol
      properties were conducted between Svalbard Island and
      Scandinavia in April 2008. Evidence of aerosol transport from
      Europe and Asia is given. The analysis of the aerosol optical
      properties based on a multiwavelength lidar (355, 532,
      1064 nm) including depolarization at 355 nm aims at
      distinguishing the role of the different aerosol sources
      (Siberian wild fires, Eastern Asia and European anthropogenic
      emissions). Combining, first aircraft measurements, second
      FLEXPART simulations with a calculation of the PBL air
      fraction originating from the three different mid-latitude
      source regions, and third level-2 CALIPSO data products (i.e.
      backscatter coefficient, depolarisation and color ratio in
      aerosol layers) along the transport pathways, appears
      a valuable approach to identify the role of the different
      aerosol sources even after a transport time larger than
      4 days. Above Asia, CALIPSO data indicate more depolarisation
      (up to 15%) and largest color ratio (&amp;gt;0.5) for the
      northeastern Asia emissions (i.e. an expected mixture of
      Asian pollution and dust), while low depolarisation together
      with smaller and quasi constant color ratio (&amp;asymp;0.3) are
      observed for the Siberian biomass burning emissions. A similar
      difference is visible between two layers observed by the
      aircraft above Scandinavia. The analysis of the time evolution
      of the aerosol optical properties revealed by CALIPSO between
      Asia and Scandinavia shows a gradual decrease of the aerosol
      backscatter, depolarisation ratio and color ratio which
      suggests the removal of the largest particles in the
      accumulation mode. A similar study conducted for a European
      plume has shown aerosol optical properties intermediate
      between the two Asian sources with color ratio never exceeding
      0.4 and moderate depolarisation ratio being always less than
      8%, i.e. less aerosol from the accumulation mode.</p>
</abstract>
<counts><page-count count="46"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple"> Atlas,~E L., Ridley,~B A., and Cantrell,~C.: The Tropospheric Ozone Production about the Spring Equinox (TOPSE) Experiment: introduction, J. Geophys. Res., 108(D4), 8353, \doi10.1029/2002JD003172, 2003. </mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple"> Bethan,~S., Vaughan,~G., and Reid,~S.: A~comparison of ozone and thermal tropopause heights and the impact of tropopause definition on quantifying the ozone content of the troposphere, Q. J. Roy. Meteor. Soc., 122, 929–944, 1996. </mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple"> Browell, E V., Hair, J., Butler, C., Grant, W., DeYoung, R., Fenn, M., Brackett, V., Clayton, M., Brasseur, L., Harper, D., Ridley, B., Klonecki, A., Hess, P., Emmons, L., Tie, X., Atlas, E., Cantrell, C., Wimmers, A., Blake, D., Coffey, M., Hannigan, J., Dibb, J., Talbot, R., Flocke, F., Weinheimer, A., Fried, A., Wert, B., Snow, J., and Lefer, B.: Ozone, aerosol, potential vorticity, and trace gas trends observed at high-latitudes over North America from February to May 2000, J. Geophys. Res., 108(D4), 8369, doi:10.1029/2001JD001 390, 2003. </mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple"> Bucholtz,~A.: Rayleigh-scattering calculations for the terrestrial atmosphere, Appl. Optics, 34, 2765–2773, \doi10.1364/AO.34.002765, http://ao.osa.org/abstract.cfm?URI=ao-34-15-2765, 1995. </mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple"> Cairo,~F., Donfrancesco,~G D., Adriani,~A., Pulvirenti,~L., and Fierli,~F.: Comparison of various linear depolarization parameters measured by lidar, Appl. Optics, 38, 4425–4432, http://ao.osa.org/abstract.cfm?URI=ao-38-21-4425, 1999. </mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple"> Cattrall,~C., Reagan,~J., Thome,~K., and Dubovik,~O.: Variability of aerosol and spectral lidar and backscatter and extinction ratios of key aerosol types derived from selected Aerosol Robotic Network locations, J. Geophys. Res., 110, D10S11, \doi10.1029/2004JD005124, 2005. </mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple"> Coheur, P.-F., Clarisse, L., Turquety, S., Hurtmans, D., and Clerbaux, C.: IASI measurements of reactive trace species in biomass burning plumes, Atmos. Chem. Phys., 9, 5655–5667, 2009.  </mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple"> Duce, R A., Unni,~C K., Ray,~B J., Prospero,~J M., and Merrill,~J T.: Long-range atmospheric transport of soil dust from Asia to the Tropical North Pacific: temporal variability, Science, 209, 1522–1524, http://www.jstor.org/stable/1684974, 1980. </mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple"> Engvall,~A., Krejci,~R., Ström,~J., Minikin,~A., Treffeisen,~R., Stohl,~A., and Herber,~A.: In-situ airborne observations of the microphysical properties of the Arctic tropospheric aerosol during late spring and summer, Tellus~B, 60(3), 392–404, \doi10.1111/j.1600-0889.2008.00348.x, 2008. </mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple"> Fehsenfeld,~F C., Ancellet,~G., Bates,~T S., Goldstein,~A H., Hardesty,~R M., Honrath,~R., Law,~K S., Lewis,~A C., Leaitch,~R., McKeen,~S., Meagher,~J., Parrish,~D D., Pszenny,~A A P., Russell,~P B., Schlager,~H., Seinfeld,~J., Talbot,~R., and Zbinden,~R.: International Consortium for Atmospheric Research on Transport and Transformation (ICARTT): North America to Europe overview of the 2004 summer field study, J. Geophys. Res., 111, D23S01, \doi10.1029/2006JD007829, 2006. </mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple"> Fisher, J. A., Jacob, D. J., Purdy, M. T., Kopacz, M., Le Sager, P., Carouge, C., Holmes, C. D., Yantosca, R. M., Batchelor, R. L., Strong, K., Diskin, G. S., Fuelberg, H. E., Holloway, J. S., Hyer, E. J., McMillan, W. W., Warner, J., Streets, D. G., Zhang, Q., Wang, Y., and Wu, S.: Source attribution and interannual variability of Arctic pollution in spring constrained by aircraft (ARCTAS, ARCPAC) and satellite (AIRS) observations of carbon monoxide, Atmos. Chem. Phys. Discuss., 9, 19035–19080, 2009.  </mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple"> Freudenthaler,~V., Esselborn,~M., Wiegner,~M., Heese,~B., Tesche,~M., Ansmann,~A., Müller,~D., Althausen,~D., Wirth,~M., Fix,~A., Ehret,~G., Knippertz,~P., Toledano,~C., Gasteiger,~J., Garhammer,~M., and Seefeldner,~M.: Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM~2006, Tellus, 61B, 165–179, \doi10.1111/j.1600-0889.2008.00396.x, http://dx.doi.org/10.1111/j.1600-0889.2008.00396.x, 2009. </mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple"> Fuelberg, H. E., Harrigan, D. L., and Sessions, W.: A meteorological overview of the ARCTAS~2008 mission, Atmos. Chem. Phys. Discuss., 9, 18417–18478, 2009.  </mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple"> Garrett,~T. and Zhao,~C.: Increased Arctic cloud longwave emissivity associated with pollution from mid-latitudes, Nature, 440, 787–789, 2006. </mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple"> Gobbi, G. P., Barnaba, F., Van Dingenen, R., Putaud, J. P., Mircea, M., and Facchini, M. C.: Lidar and in situ observations of continental and Saharan aerosol: closure analysis of particles optical and physical properties, Atmos. Chem. Phys., 3, 2161–2172, 2003.  </mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple"> Hamonou,~E., Chazette,~P., Balis,~D., Dulac,~F., Schneider,~X., Galani,~E., Ancellet,~G., and Papayannis,~A.: Characterization of the vertical structure of Saharan dust export to the mediterranean basin, J. Geophys. Res., 104, 22257–22270, 1999. </mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple"> Jacob, D. J., Crawford, J. H., Maring, H., Clarke, A. D., Dibb, J. E., Ferrare, R. A., Hostetler, C. A., Russell, P. B., Singh, H. B., Thompson, A. M., Shaw, G. E., McCauley, E., Pederson, J. R., and Fisher, J. A.: The ARCTAS aircraft mission: design and execution, Atmos. Chem. Phys. Discuss., 9, 17073–17123, 2009.  </mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple"> Law,~K. and Stohl,~A.: Arctic Air Pollution: Origins and Impacts, Science, 315(5818), 1537–1540, doi:10.1126/science.1137 695, 2007. </mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple"> Liu,~Z., Vaughan,~M., Winker,~D., Kittaka,~C., Getzewich,~B., Kuehn,~R., Omar,~A., Powell,~K., Trepte,~C., and Hostetlerd,~C.: The CALIPSO lidar cloud and aerosol discrimination: version~2 algorithm and initial assessment of performance, J. Atmos. Ocean. Tech., 26, 1198–1213, \doi10.1175/2009JTECHA1229.1, 2009. </mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple"> Methven,~J., Arnold,~S R., Stohl,~A., Avery,~M., Law,~K., Lewis,~A., Parrish,~D., Reeves,~C., Schlager,~H., Atlas,~E., Blake,~D., and Rappenglück,~B.: Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the ICARTT experiment, J. Geophys. Res., 111, D23S62, \doi10.1029/2006JD007540, 2006. </mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple"> Omar,~A., Winker,~D., Kittaka,~C., Vaughan,~M., Liu,~Z., Hu,~Y., Trepte,~C., Rogers,~R., Ferrare,~R., Lee,~K., Kuehn,~R., and Hostetler,~C.: The CALIPSO automated aerosol classification and lidar ratio selection algorithm, J. Atmos. Ocean. Tech., 26, 1994–2014, \doi10.1175/2009JTECHA1231.1, 2009. </mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple"> O&apos;Neill,~N., Eck,~T., Smirnov,~A., Holben,~B., and Thulasiraman,~S.: Spectral discrimination of coarse and fine mode optical depth, J. Geophys. Res., 108, 4559, \doi10.1029/2002JD002975, 2003. </mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple"> Paris,~J.-D., Arshinov,~M Y., Ciais,~P., Belan,~B D., and Nédélec,~P.: Large-scale aircraft\break observations of ultra-fine and fine particle concentrations in the remote Siberian\break troposphere: new particle formation studies, Atmos. Environ., 43, 1302–1309, doi:10.1016/\break j.atmosenv.2008.11.032, https://acces-distant.upmc.fr:443/http/www.sciencedirect.com/science/article/B6VH3-4V35470-5/2/1fb175cceb8cd16d86d47a1c8ca60cf0, 2009. </mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple"> Pueschel,~R. and Kinne,~S.: Physical and radiative properties of Arctic atmospheric aerosols, Sci. Total Environ., 160–161, 811–824, \doi10.1016/0048-9697(95)04414-V, 1995. </mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple"> Quinn, P. K., Bates, T. S., Baum, E., Doubleday, N., Fiore, A. M., Flanner, M., Fridlind, A., Garrett, T. J., Koch, D., Menon, S., Shindell, D., Stohl, A., and Warren, S. G.: Short-lived pollutants in the Arctic: their climate impact and possible mitigation strategies, Atmos. Chem. Phys., 8, 1723–1735, 2008.  </mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple"> Rahn,~K A.: Relative importances of North America and Eurasia as sources of arctic aerosol, Atmos. Environ., 15, 1447–1455, \doi10.1016/0004-6981(81)90351-6, 1981. </mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple"> Scheuer,~E., Talbot,~R W., Dibb,~J E., Seid,~G K., DeBell,~L., and Lefer,~B.: Seasonal distributions of fine aerosol sulfate in the North American Arctic basin during TOPSE, J. Geophys. Res., 108(D4), 8370, \doi10.1029/2001JD001364, 2003. </mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple"> Seibert, P. and Frank, A.: Source-receptor matrix calculation with a Lagrangian particle dispersion model in backward mode, Atmos. Chem. Phys., 4, 51–63, 2004.  </mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple"> Sellegri, K., Hanke, M., Umann, B., Arnold, F., and Kulmala, M.: Measurements of organic gases during aerosol formation events in the boreal forest atmosphere during QUEST, Atmos. Chem. Phys., 5, 373–384, 2005.  </mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple"> Shindell, D. T., Chin, M., Dentener, F., Doherty, R. M., Faluvegi, G., Fiore, A. M., Hess, P., Koch, D. M., MacKenzie, I. A., Sanderson, M. G., Schultz, M. G., Schulz, M., Stevenson, D. S., Teich, H., Textor, C., Wild, O., Bergmann, D. J., Bey, I., Bian, H., Cuvelier, C., Duncan, B. N., Folberth, G., Horowitz, L. W., Jonson, J., Kaminski, J. W., Marmer, E., Park, R., Pringle, K. J., Schroeder, S., Szopa, S., Takemura, T., Zeng, G., Keating, T. J., and Zuber, A.: A multi-model assessment of pollution transport to the Arctic, Atmos. Chem. Phys., 8, 5353–5372, 2008.  </mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple"> Stohl,~A., Hittenberger,~M., and Wotawa,~G.: Validation of the Lagrangian particle dispersion model FLEXPART against large scale tracer experiment data, Atmos. Environ., 32, 4245–4264, 1998. </mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple"> Stohl,~A., Eckhardt,~S., Forster,~C., James,~P., Spichtinger,~N., and Seibert,~P.: A~replacement for simple back trajectory calculations in the interpretation of atmospheric trace substance measurements, Atmos. Environ., 36, 4635–4648, 2002. </mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple"> Stohl,~A., Cooper,~O R., Damoah,~R., Fehsenfeld,~F C., Forster,~C., Hsie,~E Y., Hübler,~G., Parrish,~D D., and Trainer,~M.: Forecasting for a~Lagrangian aircraft campaign, Atmos. Environ., 4, 2405–2433, 2004. </mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple"> Stohl, A., Berg, T., Burkhart, J. F., Fjæraa, A. M., Forster, C., Herber, A., Hov, Ø., Lunder, C., McMillan, W. W., Oltmans, S., Shiobara, M., Simpson, D., Solberg, S., Stebel, K., Ström, J., Tørseth, K., Treffeisen, R., Virkkunen, K., and Yttri, K. E.: Arctic smoke - record high air pollution levels in the European Arctic due to agricultural fires in Eastern Europe in spring 2006, Atmos. Chem. Phys., 7, 511–534, 2007.  </mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple"> Stohl, A., Forster, C., Huntrieser, H., Mannstein, H., McMillan, W. W., Petzold, A., Schlager, H., and Weinzierl, B.: Aircraft measurements over Europe of an air pollution plume from Southeast Asia - aerosol and chemical characterization, Atmos. Chem. Phys., 7, 913–937, 2007.  </mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple"> Streets,~D. and Waldhoff,~S.: Present and future emissions of air pollutants in China: \chemSO_2, NO&lt;sub&gt;x&lt;/sub&gt;, and CO, Atmos. Environ., 34, 363–374, \doi10.1016/S1352-2310(99)00167-3, http://www.sciencedirect.com/science/article/B6VH3-3Y162CG-3/2/dfaeb3ef6e2170f1b0e299716e58ee1f, 2000. </mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple"> Sugimoto,~N. and Lee,~C H.: Characteristics of dust aerosols inferred from lidar depolarization measurements at two wavelengths, Appl. Optics., 45, 7468–7474, http://ao.osa.org/abstract.cfm?URI=ao-45-28-7468, 2006. </mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple"> Warneke,~C., Bahreini,~R., Brioude,~J., Brock,~C., de~Gouw,~J., Fahey,~D., Froyd,~K., Holloway,~J., Middlebrook,~A., Miller,~L., Montzka,~S., Murphy,~D., Peischl,~J., Ryerson,~T., Schwarz,~J., Spackman,~J., and Veres,~P.: Biomass burning in Siberia and Kazakhstan as an important source for haze over the Alaskan Arctic in April~2008, Geophys. Res. Lett., 36, L02813, \doi10.1029/2008GL036194, 2009. </mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple"> Weber,~R., Orsini,~D., Wang,~B., Scheuer,~E., Talbot,~R., Dibb,~J., Seid,~G., DeBell,~L., Mauldin,~R., Kosciuch,~E., Cantrell,~C., and Eisele,~F.: Investigations into free tropospheric new particle formation in the central Canadian arctic during the winter/spring transition as part of TOPSE, J. Geophys. Res., 108(D4), 8357, \doi10.1029/2002JD002239, 2003.  </mixed-citation>
</ref>
</ref-list>
</back>
</article>