Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-13177-2009 http://www.atmos-chem-phys-discuss.net/9/13177/2009/ http://www.atmos-chem-phys-discuss.net/9/13177/2009/acpd-9-13177-2009.html http://www.atmos-chem-phys-discuss.net/9/13177/2009/acpd-9-13177-2009.pdf 13177 13198 2009-06-15 Patterns of Saharan dust transport over the Atlantic: winter vs. summer, based on CALIPSO first year data Y. Ben-Ami yuval.ben-ami@weizmann.ac.il I. Koren O. Altaratz Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel One of the most important factors that determines the transported dust effect is its vertical distribution in the atmosphere. Until the launch of the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), the vertical distribution was studied mostly by in-situ measurements and models. CALIPSO, as a part of the A-Train constellation has opened an opportunity to study the transported dust vertical structure in a large number of events (sufficient statistics). <br><br> In this study the vertical structure of Saharan dust and stratiform clouds is analyzed over the Atlantic Ocean for the 2006–2007 winter (December–February) and the summer of 2006 (June–August). By using CALIPSO backscatter measurements over the dust route, we describe the differences in dust transport between the seasons. We show a bi-modal distribution of the average dust plumes height in both seasons (it is less clear in the winter). It suggests that a significant part of the dust is transported near and within the marine boundary layer and interacts with shallow clouds on both seasons. Albrecht, B. A.: Aerosols, cloud microphysics, and fractional cloudiness, Science, 245, 1227–1230, 1989. Anderson, T. L., Charlson, R. J., Bellouin, N., Boucher, O., Chin, M., Christopher, S. A., Haywood, J., Kaufman, Y. J., Kinne, S., Ogren, J. A., Remer, L. A., Takemura, T., Tanre, D., Torres, O., Trepte, C. R., Wielicki, B. A., Winker, D. M., and Yu, H.: A-Train strategy for quantifying direct climate forcing by anthropogenic aerosols, B. Am. Meteorol. Soc., 86, 1795–1809, 2005. Bergametti, G. and Dulac, F.: Progress and remaining challenges in dust deposition theory and schemes, 3rd International Workshop on Mineral Dust Leipzig, Germany, 15–17 September, 2008. Carlson, T. N. and Prospero, J. M.:, The large-scale movement of Saharan air outbreaks over the northern equatorial Atlantic, J. Appl. Meteor., 11, 283–297, 1972. Chiapello, I., Bergametti, G., Gomes, L., Chatenet, B., Dulac, F., Pimenta, J., and Soares, E. S.: An Additional Low Layer Transport of Sahelian and Saharan Dust Over the North-Eastern Tropical Atlantic, Geophys. Res. Lett., 22(23), 3191–3194, 1995. Dubovik, O., Holben, B., Eck, T. F., Smimov, A., Kaufman, Y. J., King, M. D., Tanré, D., and Slutsker, I.: Variability of absorption and optical properties of key aerosol types observed in worldwide locations, J. Atmos. Sci., 59, 590–608, 2002. Engelstaedter, S., Washington, R., and Tegen, I.: North African dust emissions and transport, Earth-Sci. Rev., 79(1–2), 73–100, 2006. Falkowski, P. G., Barber, R. T., and Smetacek, V.: Biogeochemical C ontrols and Feedbacks on Ocean Primary Production, Science, 281, 200–206, 1998. Formenti, P., Rajot, J. L., Desboeufs, K., Caquineau, S., Chevaillier, S., Nava, S., Gaudichet, A., Journet, E., Triquet, S., Alfaro, S., Chiari, M., Haywood, J. M., Coe, H., and Highwood, E. J.: Regional variability of the composition of mineral dust from Western Africa: results from the AMMA SOP0/DABEX and DODO, J. Geophys. Res, 113, D00C13, doi:10.1029/2008JD009903, 2008. Garrison, V. H., Shinn, E. A., Foreman, W. T., Griffin, D. W., Holmes, C. M., Kellogg, C. A., Majewski, M. S., Richardson, L. L., Ritchie, K. B., and Smith, G. W.: African and Asian dust: From desert soils to coral reefs, Bioscience, 53, 469–480, 2003. Generoso, S., Bey, I., Labonne, M., and Bréon, F. M.: Aerosol vertical distribution in dust outflow over the Atlantic: Comparisons between GEOS-Chem and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), J. Geophys. Res., 113, D24209, doi:10.1029/2008JD010154, 2008. Hansen, J., Sato, M., and Ruedy, R.: Radiative forcing and climate response, J. Geophys. Res., 102(D6), 6831–6864, 1997. Herman, J. R., Bhartia, P. K., Torres, O., Hsu, C., Seftor, C., and Celarier, E.: Global distribution of UV-absorbing aerosols from Nimbus-7/TOMS data, J. Geophys. Res., 102(D6), 6831–6864, 1997. IPCC: Climate Change 2007: The Scientific Basis. Contribution of Working Group I to the fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 996 pp., 2007. Israelevich, P. L., Levin, Z., Joseph, J. H., and Ganor, E.: Desert aerosol transport in the Mediterranean region as inferred from the TOMS aerosol index, J. Geophys. Res., 107(D21), 4572, doi:10.1029/2001JD002011, 2002. Karyampudi, V. M. and Carlson, N. T.: Analysis and numerical simulations of the Saharan Air Layer and its effect on easterly wave disturbances, J. Atmos. Sci., 45(21), 3102–3136, 1988. Karyampudi, V. M., Palm, S. P., Reagen, J. A., Fang, H., Grant, W. B., Hoff, R. M., Moulin, C., Pierce, H. F., Torres, O., Browell, E. V., and Melfi, S. H.: Validation of the Saharan dust plume conceptual model using lidar, Meteosat and ECMWF, B. Am. Meteorol. Soc., 80, 1045–1075, 1999. Kaufman, Y. J., Tanre D., and Boucher O.: A satellite view of aerosols in the climate system, Review. Nature, 419, 215–223, 2002. Kaufman, Y. J., Koren, I., Remer, L. A., Rosenfeld, D., and Rudich, Y.: The Effect of Smoke, Dust and Pollution Aerosol on Shallow Cloud Development Over the Atlantic Ocean, Proceedings of the National Academy of Sciences, 102(32), 11207–11212, 2005a. Kaufman, Y. J., Koren, I., Remer, L. A., Tanre, D., Ginoux, P., and Fan, S.: Dust transport and deposition observed from the Terra-Moderate Resolution Imaging Spectroradiometer (MODIS) spacecraft over the Atlantic Ocean, J. Geophys. Res., 110, D10S12, doi:10.1029/2003JD004436, 2005b. Kaufman, Y. J., Boucher, O., Tanre, D., Chin, M., Remer, L. A., and Takemura, T.: Aerosol anthropogenic component estimated from satellite data, Geophys. Res. Lett., 32, L17804, doi:10.1029/2005GL023125, 2005c. Koren, I., Kaufman, Y. J., Rosenfeld, D., Remer, L. A., and Rudich, Y.: Aerosol invigoration and restructuring of Atlantic convective clouds, Geophys. Res. Lett., 32, LI4828, doi: 10.1029/2005GL023187, 2005. Koren, I., Kaufman, Y. J., Washington, R., Todd, C. C., Rudich, Y., Martins, J. V., and Rosenfeld, D.: The Bod'el'e depression: a single spot in the Sahara that provides most of the mineral dust to the Amazon forest, Environ. Res., 1, 1–5, 2006. Levin, Z., Ganor, E., and Gladstein, V.: The effects of desert particles coated with sulfate on rain formation in the eastern Mediterranean, J. Appl. Meteor., 35, 1511–1523, 1996. Liu, Z., Liu, D., Huang, J., Vaughan, M., Uno, I., Sugimoto, N., Kittaka, C., Trepte, C., Wang, Z., Hostetler, C., and Winker, D.: Airborne dust distributions over the Tibetan Plateau and surrounding areas derived from the first year of CALIPSO lidar observations, Atmos. Chem. Phys., 8, 5045–5060, 2008. Middleton, N. J. and Goudie, A. S.: Saharan dust: sources and trajectories, Transactions of the Institute of British Geographers, 26(2), 165–181, 2001. Psenner, R.: Living in a dusty world: airborne dust as a key factor for alpine lakes, Water, Air and Soil Pollution, 112(3–4), 217–227, 1999. Prospero, J. M. and Carlson, T. N.: Vertical and areal distribution of Saharan dust over the western equatorial North Atlantic ocean, J. Geophys. Res., 77 5255–65, 1972. Prospero, J. M. and Nees R. T.: Dust concentration in the atmosphere of the equatorial North Atlantic: Possible relationship to the Sahelian drought, Science, 196, 1196–1198, doi:10.1126/science.196.4295.1196, 1977. Prospero, J. M., Ginoux, P., Torres, O., Nicholson, S. E., and Gill, T. E.: Environmental characterization of global sources of atmospheric soil dust identified with the NIMBUS 7 total ozone mapping spectrometer (TOMS) absorbing aerosol product, Rev. Geophys., 40, 1002, doi:10.1029/2000RG000095, 2002. Prospero, J. M. and Lamb, J. P.: African droughts and dust transport to the Caribbean: Climate change and implications, Science, 302, 1024–1027, 2003. Ramanathan, V., Crutzen, P. J., Kiehl, J. T., and Rosenfeld, D.: Aerosols, climate, and the hydrological cycle, Science, 294, 2119–2124, 2001. Reichholf, J. H.: Is Saharan dust a major source of nutrients for the Amazonian rain forest?, Studies on Neotropical Fauna and Environment, 21(4), 251–255, 1986. Swap, R., Garstang, M., Greco, S., Talbot, R., and Kallberg, P.: Saharan dust in Amazon basin, Tellus, 44B, 133–149, 1992. Tanaka, T. Y.: Dust emission and deposition in global models Meteorological Research Institute, 3rd International Workshop on Mineral Dust Leipzig, Germany, 15–17 September, 2008. Twomey, S.: Pollution and the planetary albedo, Atmos. Environ., 8, 1251–1256, 1974. Vaughan, M., Young, S., Winker, D., Powell, K., Omar, A., Liu, Z., Hu, Y., and Hostetler, C.: Fully Automated Analysis of Space-based Lidar data: an Overview of the CALIPSO Retrieval Algorithms and Data Products, Proc. SPIE Laser Radar Techniques for Atmospheric Sensing, 5575, 16–30, 2004. Wendisch, M., Bierwirth, E., Bauer, S., Otto, S., and Trautmann, T.: Major Factors In uencing Local Dust Radiative Forcing, 3rd International Workshop on Mineral Dust Leipzig, Germany, 15–17 September, 2008. Winker, D. M. and Pelon, J.: The CALIPSO mission, Geoscience and Remote Sensing Symposium, 2003, IGARSS '03. Proceedings. IEEE International, 2, 1329–1331, 2003. Winker, D. M., Hunt, W. H., and McGill, M. J.: Initial performance assessment of CALIOP, Geophys. Res. Lett., 34, L19803, doi:10.1029/2007GL030135, 2007. Yu, H., Kaufman, Y. J., Chin, M., Feingold, G., Remer, L., Anderson, T., Balkanski, Y., Bellouin, N., Boucher, O., Christopher, S., DeCola, P., Kahn, R., Koch, D., Loeb, N., Reddy, M. S., Schulz, M., Takemura, T., and Zhou, M.: A review of measurement-based assessments of aerosol direct radiative effect and forcing, Atmos. Chem. Phys., 6, 613–666, 2006.