Articles | Volume 21, issue 12
https://doi.org/10.5194/acp-21-9497-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-21-9497-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 Jun 2021
Research article |
| 23 Jun 2021
| 23 Jun 2021
Summer aerosol measurements over the East Antarctic seasonal ice zone
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and
Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
Ruhi S. Humphries
Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, VIC
3195, Australia
Australian Antarctic Program Partnership, University of Tasmania,
Hobart, TAS 7000, Australia
Stephen R. Wilson
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and
Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
Scott D. Chambers
ANSTO, Environmental Research, Locked Bag 2001, Kirrawee DC, NSW 2232,
Australia
Alastair G. Williams
ANSTO, Environmental Research, Locked Bag 2001, Kirrawee DC, NSW 2232,
Australia
Alan D. Griffiths
ANSTO, Environmental Research, Locked Bag 2001, Kirrawee DC, NSW 2232,
Australia
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and
Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
Ian M. McRobert
Engineering and Technology Program, CSIRO National Research
Collections Australia, Hobart, TAS 7004, Australia
Jason P. Ward
Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, VIC
3195, Australia
Melita D. Keywood
Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, VIC
3195, Australia
Australian Antarctic Program Partnership, University of Tasmania,
Hobart, TAS 7000, Australia
Sean Gribben
Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, VIC
3195, Australia
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Cited articles
Aguado, E. and Burt, J. E.: Atmospheric Circulation and Pressure
Distributions, in: Understanding Weather and Climate, Pearson, London, UK, 565 pp., 2015.
Alexander, S. P. and Protat, A.: Vertical Profiling of Aerosols With a
Combined Raman-Elastic Backscatter Lidar in the Remote Southern Ocean Marine
Boundary Layer (43–66∘ S, 132–150∘ E), J. Geophys.
Res.-Atmos., 124, 12107–12125, https://doi.org/10.1029/2019jd030628, 2019.
Alroe, J., Cravigan, L. T., Miljevic, B., Johnson, G. R., Selleck, P., Humphries, R. S., Keywood, M. D., Chambers, S. D., Williams, A. G., and Ristovski, Z. D.: Marine productivity and synoptic meteorology drive summer-time variability in Southern Ocean aerosols, Atmos. Chem. Phys., 20, 8047–8062, https://doi.org/10.5194/acp-20-8047-2020, 2020.
Atkinson, H. M., Huang, R.-J., Chance, R., Roscoe, H. K., Hughes, C., Davison, B., Schönhardt, A., Mahajan, A. S., Saiz-Lopez, A., Hoffmann, T., and Liss, P. S.: Iodine emissions from the sea ice of the Weddell Sea, Atmos. Chem. Phys., 12, 11229–11244, https://doi.org/10.5194/acp-12-11229-2012, 2012.
Ayers, G. P. and Gras, J. L.: Seasonal relationship between cloud
condensation nuclei and aerosol methanesulphonate in marine air, Nature,
353, 834–835, https://doi.org/10.1038/353834a0, 1991.
Brechtel, F. J., Kreidenweis, S. M., and Swan, H. B.: Air mass
characteristics, aerosol particle number concentrations, and number size
distributions at Macquarie Island during the First Aerosol Characterization
Experiment (ACE 1), J. Geophys. Res.-Atmos., 103, 16351–16367,
https://doi.org/10.1029/97JD03014, 1998.
Carnotcycle: How to convert relative humidity to absolute humidity:
https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/,
last access: 7 July 2020.
Carslaw, K. S., Lee, L. A., Reddington, C. L., Pringle, K. J., Rap, A.,
Forster, P. M., Mann, G. W., Spracklen, D. V., Woodhouse, M. T., Regayre, L.
A., and Pierce, J. R.: Large contribution of natural aerosols to uncertainty
in indirect forcing, Nature, 503, 67–71, https://doi.org/10.1038/nature12674, 2013.
Carslaw, K. S., Gordon, H., Hamilton, D. S., Johnson, J. S., Regayre, L. A.,
Yoshioka, M., and Pringle, K. J.: Aerosols in the Pre-industrial Atmosphere,
Current Climate Change Reports, 3, 1–15, https://doi.org/10.1007/s40641-017-0061-2, 2017.
Chambers, S. D., Hong, S.-B., Williams, A. G., Crawford, J., Griffiths, A. D., and Park, S.-J.: Characterising terrestrial influences on Antarctic air masses using Radon-222 measurements at King George Island, Atmos. Chem. Phys., 14, 9903–9916, https://doi.org/10.5194/acp-14-9903-2014, 2014.
Chambers, S. D., Preunkert, S., Weller, R., Hong, S.-B., Humphries, R. S.,
Tositti, L., Angot, H., Legrand, M., Williams, A. G., Griffiths, A. D.,
Crawford, J., Simmons, J., Choi, T. J., Krummel, P. B., Molloy, S., Loh, Z.,
Galbally, I., Wilson, S., Magand, O., Sprovieri, F., Pirrone, N., and
Dommergue, A.: Characterizing Atmospheric Transport Pathways to Antarctica
and the Remote Southern Ocean Using Radon-222, Front. Earth Sci., 6, 190,
https://doi.org/10.3389/feart.2018.00190, 2018.
Charlson, R. J., Lovelock, J. E., Andreae, M. O., and Warren, S. G.: Oceanic
phytoplankton, atmospheric sulphur, cloud albedo and climate, Nature, 326,
655–661, https://doi.org/10.1038/326655a0, 1987.
Constantin, A. and Johnson, R. S.: On the modelling of large-scale
atmospheric flow, Journal of Differential Equations, 285, 751–798,
https://doi.org/10.1016/j.jde.2021.03.019, 2021.
Dall'Osto, M., Ovadnevaite, J., Paglione, M., Beddows, D. C. S., Ceburnis,
D., Cree, C., Cortés, P., Zamanillo, M., Nunes, S. O., Pérez, G. L.,
Ortega-Retuerta, E., Emelianov, M., Vaqué, D., Marrasé, C., Estrada,
M., Sala, M. M., Vidal, M., Fitzsimons, M. F., Beale, R., Airs, R., Rinaldi,
M., Decesari, S., Cristina Facchini, M., Harrison, R. M., O'Dowd, C., and
Simó, R.: Antarctic sea ice region as a source of biogenic organic
nitrogen in aerosols, Sci. Rep. UK, 7, 6047, https://doi.org/10.1038/s41598-017-06188-x,
2017.
Davison, B., O'Dowd, C., Hewitt, C. N., Smith, M. H., Harrison, R. M., Peel,
D. A., Wolf, E., Mulvaney, R., Schwikowski, M., and Baltensperger, U.:
Dimethyl sulfide and its oxidation products in the atmosphere of the
Atlantic and southern oceans, Atmos. Environ., 30, 1895–1906,
https://doi.org/10.1016/1352-2310(95)00428-9, 1996.
Deppeler, S. L. and Davidson, A. T.: Southern Ocean Phytoplankton in a
Changing Climate, Front. Mar. Sci., 4, 40, https://doi.org/10.3389/fmars.2017.00040,
2017.
Draxler, R. R. and Hess, G. D.: An overview of the HYSPLIT_4
modelling system for trajectories, dispersion and deposition, Aust.
Meteorol. Mag., 47, 295–308, 1998.
Driedonks, A. and Tennekes, H.: Entrainment effects in the well-mixed
atmospheric boundary layer, Bound.-Lay. Meteorol., 30, 75–105, 1984.
ERA-Interim:
https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era-interim,
last access: 25 March 2019.
Fossum, K. N., Ovadnevaite, J., Ceburnis, D., Dall'Osto, M., Marullo, S.,
Bellacicco, M., Simó, R., Liu, D., Flynn, M., Zuend, A., and O'Dowd, C.:
Summertime Primary and Secondary Contributions to Southern Ocean Cloud
Condensation Nuclei, Sci. Rep., 8, 13844,
https://doi.org/10.1038/s41598-018-32047-4, 2018.
Gabric, A., Matrai, P., Jones, G., and Middleton, J.: The Nexus between
Sea Ice and Polar Emissions of Marine Biogenic Aerosols, B. Am. Meteorol.
Soc., 99, 61–81, https://doi.org/10.1175/bams-d-16-0254.1, 2018.
Gras, J. L.: CN, CCN and particle size in Southern Ocean air at Cape Grim,
Atmos. Res., 35, 233–251, https://doi.org/10.1016/0169-8095(94)00021-5, 1995.
Gras, J. L. and Keywood, M.: Cloud condensation nuclei over the Southern Ocean: wind dependence and seasonal cycles, Atmos. Chem. Phys., 17, 4419–4432, https://doi.org/10.5194/acp-17-4419-2017, 2017.
Hong, S.-B., Yoon, Y. J., Becagli, S., Gim, Y., Chambers, S. D., Park,
K.-T., Park, S.-J., Traversi, R., Severi, M., Vitale, V., Kim, J.-H., Jang,
E., Crawford, J., and Griffiths, A. D.: Seasonality of aerosol chemical
composition at King Sejong Station (Antarctic Peninsula) in 2013, Atmos.
Environ., 223, 117185, https://doi.org/10.1016/j.atmosenv.2019.117185, 2020.
Hoppel, W. A., Fitzgerald, J. W., Frick, G. M., Larson, R. E., and Mack, E.
J.: Aerosol size distributions and optical properties found in the marine
boundary layer over the Atlantic Ocean, J. Geophys. Res., 95, 3659–3686,
https://doi.org/10.1029/JD095iD04p03659, 1990.
Humphries, R. S., Schofield, R., Keywood, M. D., Ward, J., Pierce, J. R., Gionfriddo, C. M., Tate, M. T., Krabbenhoft, D. P., Galbally, I. E., Molloy, S. B., Klekociuk, A. R., Johnston, P. V., Kreher, K., Thomas, A. J., Robinson, A. D., Harris, N. R. P., Johnson, R., and Wilson, S. R.: Boundary layer new particle formation over East Antarctic sea ice – possible Hg-driven nucleation?, Atmos. Chem. Phys., 15, 13339–13364, https://doi.org/10.5194/acp-15-13339-2015, 2015.
Humphries, R. S., Klekociuk, A. R., Schofield, R., Keywood, M., Ward, J., and Wilson, S. R.: Unexpectedly high ultrafine aerosol concentrations above East Antarctic sea ice, Atmos. Chem. Phys., 16, 2185–2206, https://doi.org/10.5194/acp-16-2185-2016, 2016.
Humphries, R. S., McRobert, I. M., Ponsonby, W. A., Ward, J. P., Keywood, M.
D., Loh, Z. M., Krummel, P. B., and Harnwell, J.: Identification of platform
exhaust on the RV Investigator, Atmos. Meas. Tech., 12, 3019-3038,
10.5194/amt-12-3019-2019, 2019.
Humphries, R., Simmons, J. B., McRobert, I., Ward, J., Keywood, M., Chambers, S. D., Griffiths, A. D., Williams, A. G., and Wilson, S. R.: Polar Cell Aerosol Nucleation – atmospheric measurements from the RV Investigator voyage IN2017_V01: https://doi.org/10.25919/xs0b-an24 (last access: 2 June 2021), 2020.
Humphries, R. S., Keywood, M. D., Gribben, S., McRobert, I. M., Ward, J. P., Selleck, P., Taylor, S., Harnwell, J., Flynn, C., Kulkarni, G. R., Mace, G. G., Protat, A., Alexander, S. P., and McFarquhar, G.: Southern Ocean latitudinal gradients of Cloud Condensation Nuclei, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1246, in review, 2021.
Hyder, P., Edwards, J. M., Allan, R. P.,
Hewitt, H. T., Bracegirdle, T. J., Gregory, J. M., Wood, R. A., Meijers, A.
J. S., Mulcahy, J., Field, P., Furtado, K., Bodas-Salcedo, A., Williams, K.
D., Copsey, D., Josey, S. A., Liu, C., Roberts, C. D., Sanchez, C., Ridley,
J., Thorpe, L., Hardiman, S. C., Mayer, M., Berry, D. I., and Belcher, S.
E.: Critical Southern Ocean climate model biases traced to atmospheric model
cloud errors, Nat. Commun., 9, 3625, https://doi.org/10.1038/s41467-018-05634-2,
2018.
Kay, J. E., Wall, C., Yettella, V., Medeiros, B., Hannay, C., Caldwell, P.,
and Bitz, C.: Global Climate Impacts of Fixing the Southern Ocean Shortwave
Radiation Bias in the Community Earth System Model (CESM), J. Climate, 29, 4617–4636, https://doi.org/10.1175/JCLI-D-15-0358.1, 2016.
Laing, A. E. and Evans, J.-L.: Chapter 3: Global Circulation, in: Introduction to Tropical Meteorology, 2 Edn., edited by: Laing, A. E. and Evans, J.-L., University Corporation for Atmospheric Research, Boulder, available at: http://ftp.comet.ucar.edu/memory-stick/tropical/textbook_2nd_edition/navmenu.php_tab_4.htm, last access: 16 June 2021.
Law, C. S., Smith, M. J., Harvey, M. J., Bell, T. G., Cravigan, L. T., Elliott, F. C., Lawson, S. J., Lizotte, M., Marriner, A., McGregor, J., Ristovski, Z., Safi, K. A., Saltzman, E. S., Vaattovaara, P., and Walker, C. F.: Overview and preliminary results of the Surface Ocean Aerosol Production (SOAP) campaign, Atmos. Chem. Phys., 17, 13645–13667, https://doi.org/10.5194/acp-17-13645-2017, 2017.
Legrand, M., Yang, X., Preunkert, S., and Theys, N.: Year-round records of
sea salt, gaseous, and particulate inorganic bromine in the atmospheric
boundary layer at coastal (Dumont d'urville) and central (concordia) East
Antarctic sites, J. Geophys. Res., 121, 997–1023, https://doi.org/10.1002/2015JD024066,
2016.
McCoy, I. L., McCoy, D. T., Wood, R., Regayre, L., Watson-Parris, D.,
Grosvenor, D. P., Mulcahy, J. P., Hu, Y., Bender, F. A.-M., Field, P. R.,
Carslaw, K. S., and Gordon, H.: The hemispheric contrast in cloud
microphysical properties constrains aerosol forcing, P. Natl. Acad. Sci. USA, 117, 18998–19006, https://doi.org/10.1073/pnas.1922502117,
2020.
McGill, R., Tukey, J. W., and Larsen, W. A.: Variations of Box Plots, The
American Statistician, 32, 12–16, https://doi.org/10.2307/2683468, 1978.
Myhre, G., D. Shindell, F.-M. Bréon, W. Collins, J. Fuglestvedt, J.
Huang, D. Koch, J.-F. Lamarque, D. Lee, B. Mendoza, T. Nakajima, A. Robock,
G. Stephens, T. Takemura, H. Zhang.: Anthropogenic and Natural Radiative
Forcing., in: Climate Change 2013: The Physical Science Basis. Contribution
of Working Group I to the Fifth Assessment Report of the Intergovernmental
Panel on Climate Change, edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge University Press, Cambridge, United Kingdom and New York,
Neiburger, M., Edinger, J. G., and Bonner, W. D.: Understanding Our
Atmospheric Environment, W. H. Freeman and Company, San Fransisco, USA, 304 pp., 1971.
Nylen, T. H., Fountain, A. G., and Doran, P. T.: Climatology of katabatic
winds in the McMurdo dry valleys, southern Victoria Land, Antarctica, J.
Geophys. Res.-Atmos., 109, D3, https://doi.org/10.1029/2003jd003937, 2004.
O'Dowd, C. D., Lowe, J. A., Smith, M. H., Davison, B., Hewitt, C. N., and
Harrison, R. M.: Biogenic Sulphur Emissions and Inferred
Non-Sea-Salt-Sulphate Cloud Condensation Nuclei in and around Antarctica,
J. Geophys. Res.-Atmos., 102, 12839–12854,
https://doi.org/10.1029/96jd02749, 1997.
Parish, T. R. and Cassano, J. J.: The Role of Katabatic Winds on the
Antarctic Surface Wind Regime, Mon. Weather Rev., 131, 317–333,
https://doi.org/10.1175/1520-0493(2003)131<0317:Trokwo>2.0.Co;2, 2003.
Penner, J. E., Zhou, C., and Xu, L.: Consistent estimates from satellites
and models for the first aerosol indirect forcing, Geophys. Res. Lett., 39, 13,
https://doi.org/10.1029/2012GL051870, 2012.
Pook, M.: The Roaring Forties sometimes purr, in: Australian Antarctic
Magazine, 4, Australian Antarctic Division, Hobart, https://www.antarctica.gov.au/magazine/issue-4-spring-2002/feature2/the-roaring-forties-sometimes-purr/ (last access: 15 June 2021), 2002.
Quinn, P. K., Coffman, D. J., Kapustin, V. N., Bates, T. S., and Covert, D.
S.: Aerosol optical properties in the marine boundary layer during the First
Aerosol Characterization Experiment (ACE 1) and the underlying chemical and
physical aerosol properties, J. Geophys. Res.-Atmos., 103, 16547–16563,
https://doi.org/10.1029/97jd02345, 1998.
R Core Team: R: A language and environmental for statisitical computing, R
Foundation for Statistical Computing, Vienna, Austria, https://www.R-project.org/, 2020.
Regayre, L. A., Pringle, K. J., Booth, B. B. B., Lee, L. A., Mann, G. W.,
Browse, J., Woodhouse, M. T., Rap, A., Reddington, C. L., and Carslaw, K.
S.: Uncertainty in the magnitude of aerosol-cloud radiative forcing over
recent decades, Geophys. Res. Lett., 41, 9040–9049,
https://doi.org/10.1002/2014GL062029, 2014.
Regayre, L. A., Schmale, J., Johnson, J. S., Tatzelt, C., Baccarini, A., Henning, S., Yoshioka, M., Stratmann, F., Gysel-Beer, M., Grosvenor, D. P., and Carslaw, K. S.: The value of remote marine aerosol measurements for constraining radiative forcing uncertainty, Atmos. Chem. Phys., 20, 10063–10072, https://doi.org/10.5194/acp-20-10063-2020, 2020.
Revell, L. E., Kremser, S., Hartery, S., Harvey, M., Mulcahy, J. P., Williams, J., Morgenstern, O., McDonald, A. J., Varma, V., Bird, L., and Schuddeboom, A.: The sensitivity of Southern Ocean aerosols and cloud microphysics to sea spray and sulfate aerosol production in the HadGEM3-GA7.1 chemistry–climate model, Atmos. Chem. Phys., 19, 15447–15466, https://doi.org/10.5194/acp-19-15447-2019, 2019.
Rinaldi, M., Decesari, S., Finessi, E., Giulianelli, L., Carbone, C., Fuzzi,
S., O'Dowd, C. D., Ceburnis, D., and Facchini, M. C.: Primary and Secondary
Organic Marine Aerosol and Oceanic Biological Activity: Recent Results and
New Perspectives for Future Studies, Adv. Meteorol., 2010, 310682,
https://doi.org/10.1155/2010/310682, 2010.
Sanchez, K. J., Roberts, G. C., Saliba, G., Russell, L. M., Twohy, C., Reeves, J. M., Humphries, R. S., Keywood, M. D., Ward, J. P., and McRobert, I. M.: Measurement report: Cloud processes and the transport of biological emissions affect southern ocean particle and cloud condensation nuclei concentrations, Atmos. Chem. Phys., 21, 3427–3446, https://doi.org/10.5194/acp-21-3427-2021, 2021.
Schmale, J., Baccarini, A., Thurnherr, I., Henning, S., Efraim, A., Regayre,
L., Bolas, C., Hartmann, M., Welti, A., Lehtipalo, K., Aemisegger, F.,
Tatzelt, C., Landwehr, S., Modini, R. L., Tummon, F., Johnson, J., Harris,
N., Schnaiter, M., Toffoli, A., Derkani, M., Bukowiecki, N., Stratmann, F.,
Dommen, J., Baltensperger, U., Wernli, H., Rosenfeld, D., Gysel-Beer, M.,
and Carslaw, K.: Overview of the Antarctic Circumnavigation Expedition:
Study of Preindustrial-like Aerosols and Their Climate Effects (ACE-SPACE),
B. Am. Meteorol. Soc., 100, 2260–2283, https://doi.org/10.1175/bams-d-18-0187.1, 2019.
Scarchilli, C., Frezzotti, M., and Ruti, P. M.: Snow precipitation at four ice
core sites in East Antarctica: provenance, seasonality and blocking
factors, Clim. Dynam., 37, 2107–2125,
https://doi.org/10.1007/s00382-010-0946-4, 2011.
Shaw, G. E.: Antarctic aerosols: A review, Rev. Geophys., 26,
89–112,
https://doi.org/https://doi.org/10.1029/RG026i001p00089, 1988.
Shindell, D. T., Lamarque, J.-F., Schulz, M., Flanner, M., Jiao, C., Chin, M., Young, P. J., Lee, Y. H., Rotstayn, L., Mahowald, N., Milly, G., Faluvegi, G., Balkanski, Y., Collins, W. J., Conley, A. J., Dalsoren, S., Easter, R., Ghan, S., Horowitz, L., Liu, X., Myhre, G., Nagashima, T., Naik, V., Rumbold, S. T., Skeie, R., Sudo, K., Szopa, S., Takemura, T., Voulgarakis, A., Yoon, J.-H., and Lo, F.: Radiative forcing in the ACCMIP historical and future climate simulations, Atmos. Chem. Phys., 13, 2939–2974, https://doi.org/10.5194/acp-13-2939-2013, 2013.
Whittlestone, S. and Zahorowski, W.: Baseline radon detectors for shipboard
use: Development and deployment in the First Aerosol Characterization
Experiment (ACE 1), J. Geophys. Res.-Atmos., 103, 16743–16751,
https://doi.org/10.1029/98JD00687, 1998.
Yan, J., Jung, J., Lin, Q., Zhang, M., Xu, S., and Zhao, S.: Effect of sea
ice retreat on marine aerosol emissions in the Southern Ocean, Antarctica,
Sci. Total Environ., 745, 140773,
https://doi.org/10.1016/j.scitotenv.2020.140773, 2020.
Yu, L., Zhong, S., and Sun, B.: The Climatology and Trend of Surface Wind
Speed over Antarctica and the Southern Ocean and the Implication to Wind
Energy Application, Atmosphere, 11, 108
https://doi.org/10.3390/atmos11010108, 2020.
Zahorowski, W., Griffiths, A. D., Chambers, S. D., Williams, A. G., Law, R.
M., Crawford, J., and Werczynski, S.: Constraining annual and seasonal
radon-222 flux density from the Southern Ocean using radon-222
concentrations in the boundary layer at Cape Grim, Tellus B, 65, 19622, https://doi.org/10.3402/tellusb.v65i0.19622, 2013.
Zhang, H., Zhou, X., Zou, J., Wang, W., Xue, L., Ding, Q., Wang, X., Zhang,
N., Ding, A., Sun, J., and Wang, W.: A Review on the Methods for Observing
the Substance and Energy Exchange between Atmosphere Boundary Layer and Free
Troposphere, Atmosphere, 9, 460, https://doi.org/10.3390/atmos9120460, 2018.
Short summary
Aerosols have a climate forcing effect in the Earth's atmosphere. Few measurements exist of aerosols in the Southern Ocean, a region key to our understanding of this effect. In this study, aerosol measurements from a summer 2017 campaign in the East Antarctic seasonal ice zone are examined. Higher concentrations of aerosols were found in dry air with origins from above the Antarctic continent compared to other periods of the voyage.
Aerosols have a climate forcing effect in the Earth's atmosphere. Few measurements exist of...
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