Publications of Hartwig Harder

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.

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.

Reifenberg, S. F., Martin, A., Kohl, M., Bacer, S., Hamryszczak, Z., Tadic, I., Röder, L., Crowley, D. J., Fischer, H., Kaiser, K., Schneider, J., Dörich, R., Crowley, J. N., Tomsche, L., Marsing, A., Voigt, C., Zahn, A., Pöhlker, C., Holanda, B. A., Krüger, O., Pöschl, U., Pöhlker, M., Jöckel, P., Dorf, M., Schumann, U., Williams, J., Bohn, B., Curtius, J., Harder, H., Schlager, H., Lelieveld, J. and Pozzer, A.: Numerical simulation of the impact of COVID-19 lockdown on tropospheric composition and aerosol radiative forcing in Europe, Atmospheric Chemistry and Physics, 22(16), 10901–10917, doi:10.5194/acp-22-10901-2022, 2022.

Wietzoreck, M., Kyprianou, M., Bandowe, B. A. M., Celik, S., Crowley, J. N., Drewnick, F., Eger, P., Friedrich, N., Iakovides, M., Kukučka, P., Kuta, J., Nežiková, B., Pokorná, P., Přibylová, P., Prokeš, R., Rohloff, R., Tadic, I., Tauer, S., Wilson, J., Harder, H., Lelieveld, J., Pöschl, U., Stephanou, E. G. and Lammel, G.: Polycyclic aromatic hydrocarbons (PAHs) and their alkylated, nitrated and oxygenated derivatives in the atmosphere over the Mediterranean and Middle East seas, Atmospheric Chemistry and Physics, 22(13), 8739–8766, doi:10.5194/acp-22-8739-2022, 2022.

Nussbaumer, C. M., Pozzer, A., Tadic, I., Röder, L., Obersteiner, F., Harder, H., Lelieveld, J. and Fischer, H.: Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe, Atmospheric Chemistry and Physics, 21(9), 6151–6165, doi:10.5194/acp-22-6151-2022, 2022.

Voigt, C., Lelieveld, J., Schlager, H., Schneider, J., Curtius, J., Meerkötter, R., Sauer, D., Bugliaro, L., Bohn, B., Crowley, J. N., Erbertseder, T., Groβ, S., Hahn, V., Li, Q., Mertens, M., Pöhlker, M. L., Pozzer, A., Schumann, U., Tomsche, L., Williams, J., Zahn, A., Andreae, M., Borrmann, S., Bräuer, T., Dörich, R., Dörnbrack, A., Edtbauer, A., Ernle, L., Fischer, H., Giez, A., Granzin, M., Grewe, V., Harder, H., Heinritzi, M., Holanda, B. A., Jöckel, P., Kaiser, K., Krüger, O. O., Lucke, J., Marsing, A., Martin, A., Matthes, S., Pöhlker, C., Pöschl, U., Reifenberg, S., Ringsdorf, A., Scheibe, M., Tadic, I., Zauner-Wieczorek, M., Henke, R. and Rapp, M.: Cleaner skies during the COVID-19 lockdown, Bulletin of the American Meteorological Society, 103, doi:10.1175/BAMS-D-21-0012.1, 2022.

Nussbaumer, C. M., Crowley, J. N., Schuladen, J., Williams, J., Hafermann, S., Reiffs, A., Axinte, R., Harder, H., Ernest, C., Novelli, A., Sala, K., Martinez, M., Mallik, C., Tomsche, L., Plass-Dülmer, C., Bohn , B., Lelieveld, J. and Fischer, H.: Measurement report: Photochemical production and loss rates of formaldehyde and ozone across Europe, Atmospheric Chemistry and Physics, 21(24), 18413–18432, doi:10.5194/acp-21-18413-2021, 2021.

Dienhart, D., Crowley, J. N., Bourtsoukidis, E., Edtbauer, A., Eger, P. G., Ernle, L., Harder, H., Hottmann, B., Martinez, M., Parchatka, U., Paris, J.-D., Pfannerstill, E. Y., Rohloff, R., Schuladen, J., Stönner, C., Tadic, I., Tauer, S., Wang, N., Williams, J., Lelieveld, J. and Fischer, H.: Measurement report: Observation-based formaldehyde production rates and their relation to OH reactivity around the Arabian Peninsula, Atmospheric Chemistry and Physics, 21(23), 17373–17388, doi:10.5194/acp-21-17373-2021, 2021.

Nussbaumer, C. M., Parchatka, U., Tadic, I., Bohn , B., Marno, D., Martinez, M., Rohloff, R., Harder, H., Kluge, F., Pfeilsticker, K., Obersteiner, F., Zöger, M., Doerich, R., Crowley, J. N., Lelieveld, J. and Fischer, H.: Modification of a conventional photolytic converter for improving aircraft measurements of NO₂ via chemiluminescence chemiluminescence, Atmospheric Measurement Techniques, 14(10), 6759–6776, doi:10.5194/amt-14-6759-2021, 2021.