Publications of Hartwig Harder

Xenofontos, C., Kohl, M., Ruhl, S., Almeida, J., Caudillo-Plath, L., Cruz-Simbron, R., Dada, L., Duplissy, J., Ehrhart, S., Finkenzeller, H., Höhler, K., Kong, W., Kunkler, F., Lietzke, C. J., Mentler, B., Morawiec, A., Onnela, A., Rato, P., Rörup, B., Russell, D. M., Schervish, M., Scholz, W., Sebastian, M. K., Simon, M., Sommer, E., Tonge, Y., Umoh, N. S., Unfer, G. R., Vettikkat, L., Yang, B., Yu, W., Zgheib, I., Zheng, Z., Curtius, J., Donahue, N. M., Flagan, R. C., Gordon, H., El Haddad, I., Hansel, A., Harder, H., He, X.-C., Kirkby, J., Kulmala, M., Lehtipalo, K., Möhler, O., Petäjä, T., Pöhlker, M. L., Schobesberger, S., Stolzenburg, D., Wang, M., Winkler, P. M., Worsnop, D. R., Höpfner, M., Volkamer, R., Pozzer, A., Lelieveld, J. and Christoudias, T.: Global impact of anthropogenic NH₃ emissions on upper tropospheric aerosol formation, Proceedings of the National Academy of Sciences of the United States of America, 122(44), doi:10.1073/pnas.250665812, 2025.

Cecchini, M. A., Albrecht, R. I., Andreae, M. O., Asperen, H. v., Artaxo, P., Bagheri, G., Balestra, G. G., Barbosa, C. G. G., Barbosa, H. M. J., Bighetto, A. S., Biscaro, T. S., Bodenschatz, E., Botía, S., de Brito, L. P., Bueno, R. C., Calheiros, A. J. P., Camargo, L., Chiu, J. C., Conde, M., da Costa, E. N., Dias-Júnior, C. Q., Faulhammer, P., Franco, M. A., Giangrande, S. E., Harder, H., Haytzmann, G. G., Herdies, D. L., Herdy, S., Jones, S. P., Kesselmeier, J., Lelieveld, J., da Lopes, C. C., Lipken, F., de Macêdo, T. L. B., Magina, F. C., Massafferri, A., de Monteiro, C. A., Morais, F. G., Neofiti, M. C. S., Pöhlker, C., Pöhlker, M., Pöschl, U., Pugliesi, A. C., Raidiel, P. B., Quesada, C. A., Raj, S. S., Rizzo, L. V., Rossi, M. I., Sapucci, L. F., Saraiva, I., Seifert, P., da Silva, F. A. G., Silva, D. F., de Souza, R. A. F., Souza, C. M. A., Takeshi, B., Torres, A. B. S., Trumbore, S. E., Tsokankunku, A., Unfer, G. R., Valenti, W. I. D., de Arellano, J. V.-G., Weber, B., Williams, C. R., Williams, J. and Machado, L. A. T.: The ATTO-Campina site: A new observatory for tropical convection and gas-aerosol-cloud-precipitation interactions in the Amazon, Bulletin of the American Meteorological Society, 106, doi:10.1175/BAMS-D-24-0092.1, 2025.

Russell, D. M., Kunkler, F., Shen, J., Kohl, M., Devivo, J., Bhattacharyya, N., Xenofontos, C., Klebach, H., Caudillo-Plath, L., Simon, M., Ahongshangbam, E., Almeida, J., Amorim, A., Beckmann, H., Busato, M., Canagaratna, M. R., Chassaing, A., Cruz-Simbron, R., Dada, L., Holzbeck, P., Judmaier, B., Kaniyodical Sebastian, M., Koemets, P., Krüger, T., Liu, L., Martinez, M., Mentler, B., Morawiec, A., Onnela, A., Petaja, T., Rato, P., Reza, M., Ruhl, S., Scholz, W., Sommer, E., Tome, A., Tong, Y., Top, J., Umo, N. S., Unfer, G. R., Ward, R. X., Weissbacher, J., Yang, B., Yu, W., Zauner-Wieczorek, M., Zgheib, I., Zhang, J., Zheng, Z., El Haddad, I., Flagan, R. C., Hansel, A., Junninen, H., Kulmala, M., Lehtipalo, K., Lelieveld, J., Mohler, O., Schobesberger, S., Volkamer, R., Winkler, P. M., Worsnop, D. R., Christoudias, T., Pozzer, A., Donahue, N. M., Harder, H., Kirkby, J., He, X.-C. and Curtius, J.: Isoprene chemistry under upper-tropospheric conditions, Nature Communications, 16(1), doi:10.1038/s41467-025-64229-w, 2025.

Byron, J., Pugliese, G., Monteiro, C. de A., Robin , M., Alves, E. G., Schüttler, J., Hartmann, S. C., Edtbauer, A., Krumm, B. E., Zannoni, N., Tsokankunku, A., Dias-Junior, C. Q., Quesada, C. A., Harder, H., Bourtsoukidis, E., Lelieveld, J. and Williams, J.: Mirror image molecules expose state of rainforest stress, Communications Earth & Environment, 6(1), doi:10.1038/s43247-025-02709-z, n.d.

Byron, J., Pugliese, G., Monteiro, C. de A., Robin, M., Gomes Alves, E., Schüttler, J., Hartmann, S. C., Edtbauer, A., Krumm, B., Zannoni, N., Tsokankunku, A., Dias-Junior, C., Quesada, C., Harder, H., Bourtsoukidis, E., Lelieveld, J. and Williams, J.: Mirror image molecules expose state of rainforest stress, Communications Earth & Environment, 6, doi:10.1038/s43247-025-02709-z, 2025.

Curtius, J., Heinritzi, M., Beck, L. J., Pöhlker , M. L., Tripathi, N., Krumm, B. E., Holzbeck, P., Nussbaumer, C. M., Pardo, L. H., Klimach, T., Barmpounis, K., Andersen, S. T., Bardakov, R., Bohn, B., Cecchini, M. A., Chaboureau, J.-P., Dauhut, T., Dienhart, D., Dörich, R., Edtbauer, A., Giez, A., Hartmann, A., Holanda, B. A., Joppe, P., Kaiser, K., Keber, T., Klebach, H., Krüger, O. O., Kürten, A., Mallaun, C., Marno, D., Martinez, M., Monteiro, C., Nelson, C., Ort, L., Raj, S. S., Richter, S., Ringsdorf, A., Rocha, F., Simon, M., Sreekumar, S., Tsokankunku, A., Unfer, G. R., Valenti, I. D., Wang, N., Zahn, A., Zauner-Wieczorek, M., Albrecht, R. I., Andreae, M. O., Artaxo, P., Crowley, J. N., Fischer, H., Harder, H., Herdies, D. L., Machado, L. A. T., Pöhlker, C., Pöschl, U., Possner, A., Pozzer, A., Schneider, J., Williams, J. and Lelieveld, J.: Author Correction: Isoprene nitrates drive new particle formation in Amazon’s upper troposphere, Nature, doi:10.1038/s41586-025-08906-2, 2025.

Unfer, G. R., Machado, L. A. T., Albrecht, R. I., Cecchini, M. A., Harder, H., Magina, F. C., Pöhlker, M. L., Pöschl, U., de Arellano, J. V. G., Williams, E. R., Wolff, S. and Pöhlker, C.: Decoding the relationship between cloud electrification, downdrafts, and surface ozone in the Amazon basin, Journal of Geophysical Research: Atmospheres, 130(4), doi:10.1029/2024JD042158, 2025.

Curtius, J., Heinritzi, M., Beck, L. J., Pöhlker , M. L., Tripathi, N., Krumm, B. E., Holzbeck, P., Nussbaumer, C. M., Pardo, L. H., Klimach, T., Barmpounis, K., Andersen, S. T., Bardakov, R., Bohn, B., Cecchini, M. A., Chaboureau, J.-P., Dauhut, T., Dienhart, D., Dörich, R., Edtbauer, A., Giez, A., Hartmann, A., Holanda, B. A., Joppe, P., Kaiser, K., Keber, T., Klebach, H., Krüger, O. O., Kürten, A., Mallaun, C., Marno, D., Martinez, M., Monteiro, C., Nelson, C., Ort, L., Raj, S. S., Richter, S., Ringsdorf, A., Rocha, F., Simon, M., Sreekumar, S., Tsokankunku, A., Unfer, G. R., Valenti, I. D., Wang, N., Zahn, A., Zauner-Wieczorek, M., Albrecht, R. I., Andreae, M. O., Artaxo, P., Crowley, J. N., Fischer, H., Harder, H., Herdies, D. L., Machado, L. A. T., Pöhlker, C., Pöschl, U., Possner, A., Pozzer, A., Schneider, J., Williams, J. and Lelieveld, J.: Isoprene nitrates drive new particle formation in Amazon’s upper troposphere, Nature, 636, 124–130, doi:10.1038/s41586-024-08192-4, 2024.

Curtius, J., Heinritzi, M., Beck, L. J., Pöhlker, M. L., Tripathi, N., Krumm, B. E., Holzbeck, P., Nussbaumer, C. M., Pardo, L. H., Klimach, T., Barmpounis, K., Andersen, S. T., Bardakov, R., Bohn, B., Cecchini, M. A., Chaboureau, J.-P., Dauhut, T., Dienhart, D., Dörich, R., Edtbauer, A., Giez, A., Hartmann, A., Holanda, B. A., Joppe, P., Kaiser, K., Keber, T., Klebach, H., Krüger, O. O., Kuerten, A., Mallaun, C., Marno, D., Martinez, M., Monteiro, C., Nelson, C., Ort, L., Raj, S. S., Richter , S., Ringsdorf, A., Rocha, F., Simon, M., Sreekumar, S., Tsokankunku, A., Unfer, G. R., Valenti, I. D., Wang, N., Zahn, A., Zauner-Wieczorek, M., Albrecht, R. I., Andreae, M. O., Artaxo, P., Crowley, J. N., Fischer, H., Harder, H., Herdies, D. L., Machado, L. A. T., Pöhlker, C., Pöschl, U., Possner, A., Pozzer, A., Schneider, J., Williams, J. and Lelieveld, J.: Isoprene nitrates drive new particle formation in Amazon's upper troposphere, Nature, 636(8041), 124–130, doi:10.1038/s41586-024-08192-4, 2024.

Shen, J., Russell, D. M., DeVivo, J., Kunkler, F., Baalbaki, R., Mentler, B., Scholz, W., Yu, W., Caudillo-Plath, L., Sommer, E., Ahongshangbam, E., Alfaouri, D., Almeida, J., Amorim, A., Beck, L. J., Beckmann, H., Berntheusel, M., Bhattacharyya, N., Canagaratna, M. R., Chassaing, A., Cruz-Simbron, R., Dada, L., Duplissy, J., Gordon, H., Granzin, M., Schute, L. G., Heinritzi, M., Iyer, S., Klebach, H., Krüger, T., Kürten, A., Lampimäki, M., Liu, L., Lopez, B., Martinez, M., Morawiec, A., Onnela, A., Peltola, M., Rato, P., Reza, M., Richter, S., Rörup, B., Sebastian, M. K., Simon, M., Surdu, M., Tamme, K., Thakur, R. C., Tomé, A., Tong, Y., Top, J., Umo, N. S., Unfer, G., Vettikkat, L., Weissbacher, J., Xenofontos, C., Yang, B., Zauner-Wieczorek, M., Zhang, J., Zheng, Z., Baltensperger, U., Christoudias, T., Flagan, R. C., Haddad, I. E., Junninen, H., Möhler, O., Riipinen, I., Rohner, U., Schobesberger, S., Volkamer, R., Winkler, P. M., Hansel, A., Lehtipalo, K., Donahue, N. M., Lelieveld, J., Harder, H., Kulmala, M., Worsnop, D. R., Kirkby, J., Curtius, J. and He, X.-C.: New particle formation from isoprene under upper-tropospheric conditions, Nature, 636, 115–123, doi:10.1038/s41586-024-08196-0, 2024.

Machado, L. A. T., Unfer, G. R., Brill, S., Hildmann, S., Pöhlker, C., Cheng, Y., Williams, J., Harder, H., Andreae, M. O., Artaxo, P., Curtius, J., Franco, M. A., Cecchini, M. A., Edtbauer, A., Hoffmann, T., Holanda, B., Khadir, T., Krejci, R., Kremper, L. A., Liu, Y., Meller, B. B., Pöhlker, M. L., Quesada, C. A., Ringsdorf, A., Riipinen, I., Trumbore, S., Wolff, S., Lelieveld, J. and Pöschl, U.: Frequent rainfall-induced new particle formation within the canopy in the Amazon rainforest, Nature Geoscience, 17, doi:10.1038/s41561-024-01585-0, 2024.

Xenofontos, C., Kohl, M., Ruhl, S., Almeida, J., Beckmann, H. M., Caudillo-Plath, L., Ehrhart, S., Höhler, K., Kaniyodical Sebastian, M., Kong, W., Kunkler, F., Onnela, A., Rato, P., Russell, D. M., Simon, M., Stark, L., Umo, N. S., Unfer, G. R., Yang, B., Yu, W., Zauner-Wieczorek, M., Zgheib, I., Zheng, Z., Curtius, J., Donahue, N. M., El Haddad, I., Flagan, R. C., Gordon, H., Harder, H., He, X.-C., Kirkby, J., Kulmala, M., Möhler, O., Pöhlker, M. L., Schobesberger, S., Volkamer, R., Wang, M., Borrmann, S., Pozzer, A., Lelieveld, J. and Christoudias, T.: The impact of ammonia on particle formation in the Asian Tropopause Aerosol Layer, npj Climate and Atmospheric Science, 7(1), doi:10.1038/s41612-024-00758-3, 2024.

Nowatzki, M., Fitzsimmons, K. E., Harder, H. and Rosner, H.-J.: Investigating palaeodune orientations and contemporary wind regimes in Southeast Kazakhstan using a semi-automated mapping framework, Earth surface processes and landforms, 49, doi:10.1002/esp.5981, 2024.

Machado, L. A. T., Kesselmeier, J., Botía, S., van Asperen, H., Andreae, M. O., de Araújo, A. C., Artaxo, P., Edtbauer, A., Ferreira, R. R., Franco, M. A., Harder, H., Jones, S. P., Dias-Júnior, C. Q., Haytzmann, G. G., Quesada, C. A., Komiya, S., Lavrič, J. V., Lelieveld, J., Levin, I., Nölscher, A., Pfannerstill, E. Y., Pöhlker, M. L., Pöschl, U., Ringsdorf, A., Rizzo, L., Yáñez-Serrano, A. M., Trumbore, S. E., Valenti, W. I. D., de Arellano , J. V.-G., Walter, D., Williams, J., Wolff, S. and Pöhlker, C.: How rainfall events modify trace gas mixing ratios in central Amazonia, Atmospheric Chemistry and Physics, 24(15), 8893–8910, doi:10.5194/acp-24-8893-2024, 2024.

Nussbaumer, C. M., Kohl, M., Pozzer, A., Tadic, I., Rohloff, R., Marno, D., Harder, H., Ziereis, H. A., Zahn, A., Obersteiner, F., Hofzumahaus, A., Fuchs, H., Künstler, C., Brune, W. H., Ryerson, T. B., Peischl, J., Thompson, C., Bourgeois, I., Lelieveld, J. and Fischer, H.: Ozone Formation Sensitivity to Precursors and Lightning in the Tropical Troposphere Based on Airborne Observations, Journal of Geophysical Research: Atmospheres, 129(14), doi:10.1029/2024JD041168, 2024.

Kirkby, J., Amorim, A., Baltensperger, U., Carslaw, K. S., Christoudias, T., Curtius, J., Donahue, N. M., Haddad, I. E., Flagan, R. C., Gordon, H., Hansel, A., Harder, H., Junninen, H., Kulmala, M., Kürten, A., Laaksonen, A., Lehtipalo, K., Lelieveld, J., Möhler, O., Riipinen, I., Stratmann, F., Tomé, A., Virtanen, A., Volkamer, R., Winkler, P. M. and Worsnop, D. R.: Atmospheric new particle formation from the CERN CLOUD experiment, Nature Geoscience, 16, 948–957, doi:10.1038/s41561-023-01305-0, 2023.

Hamryszczak, Z., Dienhart, D., Brendel, B., Rohloff, R., Marno, D., Martinez, M., Harder, H., Pozzer, A., Bohn , B., Zöger , M., Lelieveld, J. and Fischer, H.: Measurement report: Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign, Atmospheric Chemistry and Physics, 23(10), 5929–5943, doi:10.5194/acp-23-5929-2023, 2023.

Dienhart, D., Brendel, B., Crowley, J. N., Eger, P. G., Harder, H., Martinez, M., Pozzer, A., Rohloff, R., Schuladen, J., Tauer, S., Walter, D., Lelieveld, J. and Fischer, H.: Formaldehyde and hydroperoxide distribution around the Arabian Peninsula – evaluation of EMAC model results with ship-based measurements, Atmospheric Chemistry and Physics, 23(1), 119–142, doi:10.5194/acp-23-119-2023, 2023.

Beall, C. M., Hill, T. C. J., DeMott, P. J., Könemann, T., Pikridas, M., Drewnick, F., Harder, H., Pöhlker, C., Lelieveld, J., Weber, B., Iakovides, M., Prokeš, R., Sciare, J., Andreae, M. O., Stokes, M. D. and Prather, K. A.: Ice-Nucleating Particles Near Two Major Dust Source Regions, Atmospheric Chemistry and Physics, 22(18), 12607–12627, doi:10.5194/acp-22-12607-2022, 2022.

Osipov, S., Chowdhury, S., Crowley, J. N., Tadic, I., Drewnick, F., Borrmann, S., Eger, P., Fachinger, F., Fischer, H., Predybaylo, E., Fnais, M., Harder, H., Pikridas, M., Vouterakos, P., Pozzer, A., Sciare, J., Ukhov, A., Stenchikov, G. L., Williams, J. and Lelieveld, J.: Severe atmospheric pollution in the Middle East is attributable to anthropogenic sources, Communications Earth & Environment, 3, doi:10.1038/s43247-022-00514-6, 2022.