References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-16265-2011

In-situ observation of Asian pollution transported into the Arctic lowermost stratosphere

Roiger

¹ Schlager

¹ Schäfler

¹ Huntrieser

¹ Scheibe

¹ Aufmhoff

¹ ² Cooper

O. R.

³ Sodemann

⁴ ⁸ Stohl

⁴ Burkhart

⁴ Lazzara

⁵ Schiller

⁶ Law

K. S.

⁷ Arnold

¹ ²

Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany

Max-Planck-Institute of Nuclear Physics, Atmospheric Physics Division, Heidelberg, Germany

Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA Earth System Research Laboratory, Boulder, USA

Norwegian Institute for Air Research (NILU), Kjeller, Norway

Space Science and Engineering Center, University of Wisconsin-Madison, Madison, USA

Forschungszentrum Jülich, IEK-7: Stratosphere, Germany

UPMC Univ. Paris 06; Univ. Versailles St-Quentin; CNRS/INSU, LATMOS-IPSL, Paris, France

now at: Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland

31 05 2011

11 5 16265 16310

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On a research flight on 10 July 2008, the German research aircraft Falcon sampled an air mass with unusually high carbon monoxide (CO), peroxyacetyl nitrate (PAN) and water vapour (H2O) mixing ratios in the Arctic lowermost stratosphere. The air mass was encountered twice at an altitude of 11.3 km, ~800 m above the dynamical tropopause. In-situ measurements of ozone, NO, and NOy indicate that this layer was a mixed air mass containing both air from the troposphere and stratosphere. Backward trajectory and Lagrangian particle dispersion model analysis suggest that the Falcon sampled the top of a polluted air mass originating from the coastal regions of East Asia. The anthropogenic pollution plume experienced strong up-lift in a warm conveyor belt (WCB) located over the Russian east-coast. Subsequently the Asian air mass was transported across the North Pole into the sampling area, elevating the local tropopause by up to ~3 km. Mixing with surrounding Arctic stratospheric air most likely took place during the horizontal transport when the tropospheric streamer was stretched into long and narrow filaments. The mechanism illustrated in this study possibly presents an important pathway to transport pollution into the polar tropopause region.

References 1

Akimoto, H.: Global air quality and Pollution, Science, 302, 1716, http://dx.doi.org/10.1126/science.1092666doi:10.1126/science.1092666, 2003.

Boering, K. A., Wofsy, S. C., Daube, B. C., Schneider, H. R., Loewenstein, M., Podolske, J. R., and Conway, T. J.: Stratospheric Mean Ages and Transport Rates from Observations of Carbon Dioxide and Nitrous Oxide, Science, 274(5291), 1340–1343, http://dx.doi.org/10.1126/science.274.5291.1340doi:10.1126/science.274.5291.1340, 1997.

Bönisch, H., Engel, A., Curtius, J., Birner, Th., and Hoor, P.: Quantifying transport into the lowermost stratosphere using simultaneous in-situ measurements of SF$_6$ and CO2, Atmos. Chem. Phys., 9, 5905–5919, http://dx.doi.org/10.5194/acp-9-5905-2009doi:10.5194/acp-9-5905-2009, 2009.

Bradshaw, J., Davis, D., Grodzinsky, G., Smyth, S., Newell, R., Sandholm, S., and Liu, S.: Observed distributions of nitrogen oxides in the remote free troposphere from the NASA global tropospheric experiment programs, Rev. Geophys., 38, 61–116, 2000.

Brioude, J., Cooper, O. R., Trainer, M., Ryerson, T. B., Holloway, J. S., Baynard, T., Peischl, J., Warneke, C., Neuman, J. A., De Gouw, J., Stohl, A., Eckhardt, S., Frost, G. J., McKeen, S. A., Hsie, E.-Y., Fehsenfeld, F. C., and Nédélec, P.: Mixing between a stratospheric intrusion and a biomass burning plume, Atmos. Chem. Phys., 7, 4229–4235, http://dx.doi.org/10.5194/acp-7-4229-2007doi:10.5194/acp-7-4229-2007, 2007.

Cooper, O. R., Moody, J. L., Parrish, D. D., Trainer, M., Ryerson, T. B., Holloway, J. S. Huebler, G., Fehsenfeld, F. C., and Evans, M. J.: Trace gas composition of midlatitude cyclones over the western North Atlantic Ocean: A conceptual model, J. Geophys. Res., 107(D7), ACH-1-13, 2002.

Cooper, O. R., Forster, C., Parrish, D., Trainer, M., Dunlea, E., Ryerson, T., Hübler, G., Fehsenfeld, F., Nicks, D., Holloway, J., de Gouw, J., Warneke, C., Roberts, J. M., Flocke, F., and Moody, J.: A case study of transpacific warm conveyor belt transport: Influence of merging airstreams on trace gas import to North America, J. Geophys. Res., 109, D23S08, doi:10.1029/2003JD003624, 2004.

Cooper, O. R., Stohl, A., Hübler, G., Hsie, E. Y., Parrish, D. D., Tuck, A. F., Kiladis, E. N., Oltmans, S. J., Johnson, B. J., Shapiro, M., Moody, J. L., and Lefohn, A. S.: Direct transport of mid-latitude stratospheric ozone into the lower troposphere and marine boundary layer of the tropical Pacific Ocean, J. Geophys. Res., 110, D23310, doi:10.1029/2005JD005783, 2005.

Dessler, A. E.: Clouds and water vapour in the Northern hemisphere summertime stratosphere, J. Geophys. Res., 114, D00H09, http://dx.doi.org/10.1029/2009JD012075doi:10.1029/2009JD012075, 2009.

Dickerson, R. R., Li, C., Li, Z., Marufu, L. T., Stehr, J. W., McClure, B., Krotkov, N., Chen, H., Wang, P., Xia, X., Ban, X., Gong, F., Yuan, J., and Yang, J.: Aircraft observations of dust and pollutants over northeast China: Insight into the meteorological mechanisms of transport, J. Geophys. Res., 112, D24S90, doi:10.1029/2007JD008999, 2007.

Ding, A., Wang, T., Xue, L., Gao, J., Stohl, A., Lei, H., Jin, D., Ren, Y., Wang, X., Wei, X., Qi, Y., Liu, J., and Zhang, X.: Transport of north China air pollution by mid-latitude cyclones: Case study of aircraft measurements in summer 2007, J. Geophys. Res., 114, D08304, doi:10.1029/2008JD011023, 2009.

Eckhardt, S., Stohl, A., Beirle, S., Spichtinger, N., James, P., Forster, C., Junker, C., Wagner, T., Platt, U., and Jennings, S. G.: The North Atlantic Oscillation controls air pollution transport to the Arctic, Atmos. Chem. Phys., 3, 1769–1778, http://dx.doi.org/10.5194/acp-3-1769-2003doi:10.5194/acp-3-1769-2003, 2003.

Eckhardt, S., Stohl, A., Wernli, H., James, P., Forster, C., and Spichtinger, N.: A 15-year Climatology of Warm Conveyor Belts, J. Climate, 17, 218–237, 2004.

Emmons, L. Hauglustaine, D., Müller, J. F., Carroll, M., Brasseur, G., Brunner, D., Staehelin, J., Thouret, V., and Marenco, A.: Data composites of airborne observations of tropospheric ozone and its precursors, J. Geophys. Res., 105(D16), 20497–20538, 2000.

Esler, J. G., Tan, D. G. H., Haynes, P. H., Evans, M. J., Law, K. S., Plantevin, P.-H., and Pyle, J. A.: Stratosphere-troposphere exchange: Chemical sensitivity to mixing, J. Geophys. Res., 106(D5), 4717–4731, 2001.

Fiedler, V., Nau, R., Ludmann, S., Arnold, F., Schlager, H., and Stohl, A.: East Asian SO2 pollution plume over Europe – Part 1: Airborne trace gas measurements and source identification by particle dispersion model simulations, Atmos. Chem. Phys., 9, 4717–4728, http://dx.doi.org/10.5194/acp-9-4717-2009doi:10.5194/acp-9-4717-2009, 2009.

Fischer, H., Wienhold, F. G., Hoor, P., Bujok, O., Schiller, C., Siegmund, P., Ambaum, M., Scheren, H. A., and Lelieveld, J.: Tracer correlations in the northern high-latitude lowermost stratosphere: Influence of cross-tropopause mass exchange, Geophys. Res. Lett., 27(1), 97–100, 2000.

Fischer, H., Lawrence, M., Gurk, Ch., Hoor, P., Lelieveld, J., Hegglin, M. I., Brunner, D., and Schiller, C.: Model simulations and aircraft measurements of vertical, seasonal and latitudinal O3 and CO distributions over Europe, Atmos. Chem. Phys., 6, 339–348, http://dx.doi.org/10.5194/acp-6-339-2006doi:10.5194/acp-6-339-2006, 2006.

Flocke, F., Herman, R. L., Salawitch, R. J., Atlas, E., Webster, C. R., Schauffler, S. M., Lueb, R. A., May, R. D., Moyer, E. J., Rosenlof, K. H., Scott, D. C., Blake, D. R., and Biu, T. P.: An examination of chemistry and transport processes in the tropical lower stratosphere using observations of long-lived and short-lived compounds obtained during STRAT and POLARIS, J. Geophys. Res., 104, 26625–26642, 1999.

Frost, G. J., McKeen, S. A., Trainer, M., Ryerson, T. B., Neuman, J. A., Roberts, J. M., Swanson, A., Holloway, J. S., Super, D. T., Fortin, T., Parrish, D. D., Fehsenfeld, F. C., Flocke, F., Peckham, S. E., Grell, G. A., Kowal, D., Cartwright, J., Auerbach, N., and Habermann, T.: Effects of changing power plant NOx emissions on ozone in the eastern United States: Proof of concept, J. Geophys Res., 111, D12306, http://dx.doi.org/10.1029/2005JD006354doi:10.1029/2005JD006354, 2006.

Fueglistaler, S., Dessler, A. E., Dunkerton, T. J., Folkins, I., Fu, Q., and Mote, P. W: Tropical tropopause layer, Rev. Geophys., 47, RG1004, http://dx.doi.org/10.1029/2008RG000267doi:10.1029/2008RG000267, 2009.

Gerbig, C., Schmitgen, S., Kley, D., Volz-Thomas, A., Dewey, K., and Haaks, D.: An improved fast-response vacuum-UV resonance fluorescence CO instrument, J. Geophys. Res., 104(D1), 1699–1704, 1999.

Herman, R. L., Webster, C. R., May, R. D., Scott, D. C., Hu, H., Moyer, E. J., Wennberg, P. O., Hanisco, T. F., Lanzendorf, E. J., Salawitch, R. J., Yung, Y. L., Margitan, J. J., and Bui, T. P.: Measurements of CO in the upper troposphere and lowermost stratosphere, Chemosphere-Global Change Science, 1, 173–183, 1999.

Hintsa, E. J., Boering, K. A., Weinstock, E. M., Anderson, J. G., Gary, B. L., Pfister, L., Daube, B. C., Wofsy, S. C., Loewenstein, M., Podolske, J. R., Margitan, J. J., and Biu, T. P.: Troposphere to stratosphere transport in the lowermost stratosphere from measurements of H2O, CO2, N2O and O3, Geophys. Res. Lett., 25(14), 2655–2658, 1999.

Holton, J. R., Haynes, P. H., McIntyre, M. E., Douglass, A. R., Rood, R. B., and Pfister, L.: Stratosphere-Troposphere Exchange, Rev. Geophys., 33, 403–439, 1995.

Hoor, P., Fischer, H., Lange, L., Lelieveld, J., and Brunner, D.: Seasonal variations of a mixing layer in the lowermost stratosphere as identified by the CO-O3 correlation from in-situ measurements, J. Geophys. Res., 107(D5), ACL 1-1-18, 2002.

Hoor, P., Gurk, C., Brunner, D., Hegglin, M. I., Wernli, H., and Fischer, H.: Seasonality and extent of extratropical TST derived from in-situ CO measurements during SPURT, Atmos. Chem. Phys., 4, 1427–1442, http://dx.doi.org/10.5194/acp-4-1427-2004doi:10.5194/acp-4-1427-2004, 2004.

Jacob, D. J., Crawford, J. H., Kleb, M. M., Connors, V. S., Bendura, R. J., Raper, J. L., Sachse, G. W., Gille, J. C., Emmons, L., and Heald, C. L.: Transport and Chemical Evolution over the Pacific (TRACE-P) aircraft mission: Design, execution, and first results, J. Geophys. Res., 108, 9000, http://dx.doi.org/10.1029/2002JD003276doi:10.1029/2002JD003276, 2003.

Jaffe, D., Anderson, T., Covert, D., Kotchenruther, R., Trost, B., Danielsen, J., Simpson, W., Berntsen, T., Karlsdottir, S., Blake, D., Harris, J., Carmichael, G., and Uno, I.: Transport of Asian air pollution to North America, Geophys. Res. Lett., 26, 711–714, 1999.

Jaffe, D., McKendry, I., Anderson, T., and Price, H.: Six `new' episodes of trans-Pacific transport of air pollutants, Atmos. Environ., 37(3), 391–404, 2003.

Koike, M., Kondo, Y., Kita, K., Takegawa, N., Masui, Y., Miyazaki, Y., Ko, M. W., Weinheimer, A. J., Flocke, F., Weber, R. J., Thornton, D. C., Sachse, G. W., Vay, S. A., and Blake, D. R.: Export of anthropogenic reactive nitrogen and sulfur compounds from the East Asia region during spring, J. Geophys. Res., 108(D20), GTE 10-1-19, http://dx.doi.org/10.1029/2002JD003284doi:10.1029/2002JD003284, 2003.

Krebsbach, M., Schiller, C., Brunner, D., Günther, G., Hegglin, M. I., Mottaghy, D., Riese, M., Spelten, N., and Wernli, H.: Seasonal cycles and variability of O3 and H2O in the UT/LMS during SPURT, Atmos. Chem. Phys., 6, 109–125, http://dx.doi.org/10.5194/acp-6-109-2006doi:10.5194/acp-6-109-2006, 2006.

Kunz, A., Konopka, P., Müller, R., Pan, L. L., and Rohrer, F.: High static stability in the mixing layer above the extratropical tropopause, J. Geophys. Res., 114, D16305, http://dx.doi.org/10.1029/2009JD011840doi:10.1029/2009JD011840, 2009.

Law, K. and Stohl, A.: Arctic Air Pollution: Origins and Impact, Science, 16(315, 5818), 1537–1540, http://dx.doi.org/10.1126/science.1137695doi:10.1126/science.1137695, 2007.

Lazzara, M. A. and Knuth, S. L.: Arctic and Antarctic Satellite composite Imagery, Polar Science, in preparation, 2011.

Lazzara, M. A., Coletti, A., and Diedrich, B. L.: The possibilities of polar meteorology, environmental remote sensing, communications and space weather applications from artificial Lagrange orbit, Adv. Space Res., accepted, 2011.

Liang, Q., Rodriguez, J. M., Douglass, A. R., Crawford, J. H., Apel, E., Bian, H., Blake, D. R., Brune, W., Chin, M., Colarco, P. R., da Silva, A., Diskin, G. S., Duncan, B. N., Huey, L. G., Knapp, D. J., Montzka, D. D., Nielsen, J. E., Olson, J. R., Pawson, S., Weinheimer, A. J., and Reimer, D. D.: Reactive nitrogen, ozone and ozone production in the Arctic troposphere and the impact of stratosphere-troposphere exchange, Atmos. Chem. Phys. Discuss., 11, 10721–10767, http://dx.doi.org/10.5194/acpd-11-10721-2011doi:10.5194/acpd-11-10721-2011, 2011.

Mari, C., Evans, M. J., Palmer, P. I., Jacob, D. J., and Sachse, G. W.: Export of Asian pollution during two cold front episodes of the TRACE-P experiment, J. Geophys. Res., 109, D15S17, http://dx.doi.org/10.1029/2003JD004307doi:10.1029/2003JD004307, 2004.

Neuman, J. A., Parrish, D. D., Ryerson, T. B., Brock, C. A., Wiedinmyer, C., Frost, G. J., Holloway, J. S., and Fehsenfeld, F. C.: Relationship between photochemical ozone production and NOx oxidation in Houston, Texas, J. Geophys. Res., 114, D00F08, http://dx.doi.org/10.1029/2004JD005092doi:10.1029/2004JD005092, 2009.

Novelli, P. C., Steele, L. P., and Tans, P. P.: Mixing ratios of Carbon Monoxide in the Troposphere, J. Geophys. Res., 97(D18), 20731–20750, 1992.

Novelli, P. C., Masarie, K. A., Lang, P. M., Hall, B. D., Myers, R. C., and Elkins, J. W: Reanalysis of tropospheric CO trends: Effects of the 1997–1998 Wildfires, J. Geophys. Res., 108, D15, http://dx.doi.org/10.1029/2002JD003031doi:10.1029/2002JD003031, 2003.

Nowak, J., Parris, D. D., Neuman, J. A., Holloway, J. S., Cooper. O. R., Ryerson, T. B., Nicks, D. K., Flocke, F., Roberts, J. M., Atlas, E., de Gouw, J. A., Donnelly, S., Dunlea, E., Hübler, G., Huey, L. G., Schauffler, S., Tanner, D. J., Warneke, C., and Fehsenfeld, F. C. S.: Gas-phase chemical characteristics of Asian emission plumes observed during ITCT 2K2 over the eastern North Pacific Ocean, J. Geophys. Res., 109, D23S19, http://dx.doi.org/10.1029/2003JD004488doi:10.1029/2003JD004488, 2004.

Orsolini, Y. J. and Sorteberg, A.: Projected changes in Eurasian and Arctic summer cyclones under global warming in the Bergen Climate Model, Atmos. Oceanic Sci. Lett., 2, 62–67, 2009.

Pan, L. L., Randel, W. J., Gary, B. L., Mahoney, M. J., and Hinsta, E. J.: Definitions and sharpness of the extratropical tropopause: A trace gas perspective, J. Geophys. Res., 109, D23103, http://dx.doi.org/10.1029/2004JD004982doi:10.1029/2004JD004982, 2004.

Pan, L. L., Konopka, P., and Browell, E. V.: Observations and model simulations of mixing near the extratropical tropopause, J. Geophys. Res., 111, D05106, http://dx.doi.org/10.1029/2005JD006480doi:10.1029/2005JD006480, 2006.

Pan, L. L., Bowman, K. P., Shapiro, M., Randel, W. J., Gao, R. S., Campos, T., Davis, C., Schauffler, S., Ridley, B. A., Wei, J. C., and Barbet, C.: Chemical behaviour of the tropopause observed during the Stratosphere-Tropophere Analyses of Regional Transport Experiment, J. Geophys. Res., 112, D18110, http://dx.doi.org/10.1029/2007JD008645doi:10.1029/2007JD008645, 2007.

Parrish, D., Holloway, J., Jakoubek, R., Trainer, M., Ryerson, T., Hübler, G., Fehsenfeld, F., Moody, J., and Cooper, O.: Mixing of anthropogenic pollution with stratospheric ozone: A case study from the North Atlantic wintertime troposphere, J. Geophys. Res., 105(D19), 24363–24374, 2000.

Plumb, R. A. and Ko, M. K. W.: Interrelationships between mixing ratios of long-lived stratospheric constituents, J. Geophys. Res., 97, 10145–10156, 1992.

Reed, R. J. and Kunkel, B. A.: The Arctic circulation in summer, J. Atmos. Sci., 17, 489–506, 1960.

Richter, A., Burrows, J. P., Nueß, H., Granier, C., and Niemeier, U.: Increase in tropospheric nitrogen dioxide over China observed from space, Letters to Nature, 437, http://dx.doi.org/10.1038/nature04092doi:10.1038/nature04092, 2005.

Roiger, A., Aufmhoff, H., Stock, P., Arnold, F., and Schlager, H.: An aircraft-borne chemical ionization – ion trap mass spectrometer (CI-ITMS) for fast PAN and PPN measurements, Atmos. Meas. Tech., 4, 173–188, http://dx.doi.org/10.5194/amt-4-173-2011doi:10.5194/amt-4-173-2011, 2011.

Sawa, Y., Machida, T., and Matsueda, H.: Seasonal variations of CO2 near the tropopause observed by commercial aircraft, J. Geophys. Res., 113, D23301, http://dx.doi.org/10.1029/2008JD010568doi:10.1029/2008JD010568, 2008.

Schmale, J., Schneider, J., Ancellet, G., Quennehen, B., Stohl, A., Sodemann, H., Burkhart, J., Hamburger, T., Arnold, S. R., Schwarzenboeck, A., Borrmann, S., and Law, K. S.: Source identification and airborne chemical characterisation of aerosol pollution from long-range transport over Greenland during POLARCAT summer campaign 2008, Atmos. Chem. Phys. Discuss., 11, 7593–7658, http://dx.doi.org/10.5194/acpd-11-7593-2011doi:10.5194/acpd-11-7593-2011, 2011.

Serreze, M. C. and Barrett, A. P.: The summer cyclone maximum over the central Arctic ocean, J. Climate, 21, 1048–1065, 2008.

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, http://dx.doi.org/10.5194/acp-8-5353-2008doi:10.5194/acp-8-5353-2008, 2008.

Singh, H. B., Brune, W. H., Crawford, J. H., Flocke, F., and Jacob, D. J.: Chemistry and transport of pollution over the Gulf of Mexico and the Pacific: spring 2006 INTEX-B campaign overview and first results, Atmos. Chem. Phys., 9, 2301–2318, http://dx.doi.org/10.5194/acp-9-2301-2009doi:10.5194/acp-9-2301-2009, 2009.

Singh, H. B., Anderson, B. E., Brune, W. H., Cai, C., Cohen, R. C., Crawford, J. H., Cubison, M. J., Czech, E. P., Emmons, L., Fuelberg, H. E., Huey, G., Jacob, D. J., Jimenez, J. L., Kaduwela, A., Kondo, Y., Mao, J., Olson, R. J., Sachse, G. W., Vay, S. A., Weinheimer, A., Wennberg, P. O., Wisthaler, A., and the ARCTAS Science Team: Pollution influences on atmospheric composition and chemistry at high northern latitudes, Boreal and California forest fire emissions, Atmos. Environ., 44, 4553–4564, 2010.

Sodemann, H., Pommier, M., Arnold, S. R., Monks, S. A., Stebel, K., Burkhart, J. F., Hair, J. W., Diskin, G. S., Clerbaux, C., Coheur, P.-F., Hurtmans, D., Schlager, H., Blechschmidt, A.-M., Kristjánsson, J. E., and Stohl, A.: Episodes of cross-polar transport in the Arctic troposphere during July 2008 as seen from models, satellite, and aircraft observations, Atmos. Chem. Phys., 11, 3631–3651, http://dx.doi.org/10.5194/acp-11-3631-2011doi:10.5194/acp-11-3631-2011, 2011.

Solomon, S., Garcia, R., and Stordal, F.: Transport Processes and Ozone Perturbations, J. Geophys. Res., 90(D7), 12981–12989, 1985.

Stohl, A.: A one-year Lagrangian "climatology" of airstreams in the northern hemisphere troposphere and lowermost stratosphere, J. Geophys. Res., 106, 7263–7279, 2001.

Stohl, A.: Characteristics of atmospheric transport into the Arctic troposphere, J. Geophys. Res., 111, D11306, http://dx.doi.org/10.1029/2005JD006888doi:10.1029/2005JD006888, 2006.

Stohl, A. and Thomson, D. J.: A density correction for Lagrangian particle dispersion models, Bound.-Lay. Meteorol., 90, 155–167, 1999.

Stohl, A., Trainer, M., Ryerson, T. B., Holloway, J. S., and Parrish, D. D.: Export of NOy from the North American boundary layer during 1996 and 1997 North Atlantic Regional Experiments, J. Geophys. Res., 107, http://dx.doi.org/10.1029/2001JD000519doi:10.1029/2001JD000519, 2002.

Stohl, A., Forster, C., Eckhardt, S., Spichtinger, N., Huntrieser, H., Heland, J., Schlager, H., Wilhelm, S., Arnold, F., and Cooper, O.: A backward modeling study of intercontinental pollution transport using aircraft measurements, J. Geophys. Res., 108, 4370, http://dx.doi.org/10.1029/2002JD002862doi:10.1029/2002JD002862, 2003.

Stohl, A., Forster, C., Frank, A., Seibert, P., and Wotawa, G.: Technical note: The Lagrangian particle dispersion model FLEXPART version~6.2, Atmos. Chem. Phys., 5, 2461–2474, http://dx.doi.org/10.5194/acp-5-2461-2005doi:10.5194/acp-5-2461-2005, 2005.

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, http://dx.doi.org/10.5194/acp-7-913-2007doi:10.5194/acp-7-913-2007, 2007.

Suntharalingam, P., Jacob, D. J., Palmer, P. I., Logan, J. A., Yantosca, Y. M., Xiao, Y., Evans, M., Streets, D. G., Vay, S. L., and Sachse, G. W.: Improved quantification of Chinese carbon fluxes using CO2/CO correlations in Asian outflow, J. Geophys. Res., 109, D18S18, http://dx.doi.org/10.1029/2003JD004362doi:10.1029/2003JD004362, 2004.

Talukdar, R. K., Burkholder, J. B., Schmoltner, A.-M., Roberts, J. M., Wilson, R. R., and Ravishankara, A. R.: Investigation of the loss processes for peroxyacetyl nitrate in the atmosphere: UV photolysis and reaction with OH, J. Geophys. Res., 100, 14163–14173, 1995.

Tilmes, S., Pan, L. L., Hoor, P., Atlas, E., Avery, M. A., Campos, T., Christensen, L. E., Diskin, G. S., Gao, R. S., Herman, R. L., Hintsa, E. J., Loewenstein, M., Lopez, J., Paige, M. E., Pittman, J. V., Podolske, J. R., Proffitt, M. R., Sachse, G. W., Schiller, C., Schlager, H., Smith, J., Spelten, N., Webster, C., Weinheimer, A., and Zondlo, M. A.: An aircraft-based upper troposphere lower stratosphere O3, CO and H2O climatology for the Northern Hemisphere, J. Geophys. Res., 115, D14303, http://dx.doi.org/10.1029/2009JD012731doi:10.1029/2009JD012731, 2010.

Trickl, T., Cooper, O. R., Eisele, H., James, P., Mücke, R., and Stohl, A.: Intercontinental transport and its influence on the ozone concentrations over central Europe: Three case studies, J. Geophys. Res., 108, 8530, http://dx.doi.org/10.1029/2002JD002735doi:10.1029/2002JD002735, 2003.

Wang, Y., Munger, J. W., Xu, S., McElroy, M. B., Hao, J., Nielsen, C. P., and Ma, H.: CO2 and its correlation with CO at a rural site near Beijing: implications for combustion efficiency in China, Atmos. Chem. Phys., 10, 8881–8897, http://dx.doi.org/10.5194/acp-10-8881-2010doi:10.5194/acp-10-8881-2010, 2010.

Wernli, H. and Bourqui, M.: A Lagrangian "1-year climatology" of (deep) cross-tropopause exchange in the extratropical northern hemisphere, J. Geophys. Res., 107(D2), ACL 13-1–13-16, 2002.

Wernli, H. and Davies, H. C.: A Lagrangian-based analysis of extratropical cyclones. I: The method and some applications, Q. J. Roy. Meteorol. Soc., 123, 467–489, 1997.

Wigley, T. M. L. and Schimel, D. S.: The carbon cycle, Cambridge University Press, Cambridge, 7–36, 2000.

Wild, O. and Akimoto, H.: Intercontinental transport of ozone and its precursors in a three-dimensional global CTM, J. Geophys. Res., 106(D21), 27729–27744, 2001.

Zahn, A. and Brenninkmeijer, C.: New directions: A chemical tropopause defined, Atmos. Environ., 37, 439–440, 2003.

Zahn, A., Brenninkmeijer, C. A. M., Maiss, M., Scharffe, D. H., Crutzen, P. J., Herrmann, M., Heintzenberg, J., Wiedensohler, A., Güsten, H., Heinrich, G., Fischer, H., Cuijpers, J. W. M., and van Velthofen, P. F. J.: Identification of extratropical troposphere-stratosphere mixing based on CARIBIC measurements of O3, CO and ultra-fine particles, J. Geophys. Res., 105(D1), 1527–1535, 2000.

Zhang, Q., Streets, D. G., Carmichael, G. R., He, K. B., Huo, H., Kannari, A., Klimont, Z., Park, I. S., Reddy, S., Fu, J. S., Chen, D., Duan, L., Lei, Y., Wang, L. T., and Yao, Z. L.: Asian emissions in 2006 for the NASA INTEX-B mission, Atmos. Chem. Phys., 9, 5131–5153, http://dx.doi.org/10.5194/acp-9-5131-2009doi:10.5194/acp-9-5131-2009, 2009.

Ziereis, H. Schlager, H., Schulte, P., van Velthoven, P., and Slemr, F.: Distributions of NO, NOx, and NOy in the upper troposphere and lower stratosphere between 28° and 61° N during POLINAT 2, J. Geophys. Res., 105(D3), 3653–3664, 2000.

Zöger, M., Afchine, A., Eicke, N., Gerhards, M.-T., Klein, E., McKenna, D. S., Mörschel, U., Schmidt, U., Tan, V., Tuitjer, F., Woyke, T., and Schiller, C.: Fast in situ stratospheric hygrometers: A new family of balloon-borne and airborne Lyman-$\alpha $ photofragment fluorescence hygrometers, J. Geophys. Res., 104(D1), 1807–1816, 1999.