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Your search keyword '"A. Hofzumahaus"' showing total 8 results
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8 results on '"A. Hofzumahaus"'

1. The South Asian monsoon—pollution pump and purifier

Author

Lelieveld, J., Bourtsoukidis, E., Brühl, C., Fischer, H., Fuchs, H., Harder, H., Hofzumahaus, A., Holland, F., Marno, D., Neumaier, M., Pozzer, A., Schlager, H., Williams, J., Zahn, A., and Ziereis, H.

Published
2018

2. Missing Gas-Phase Source of HONO Inferred from Zeppelin Measurements in the Troposphere

Author

Li, Xin, Rohrer, Franz, Hofzumahaus, Andreas, Brauers, Theo, Häseler, Rolf, Bohn, Birger, Broch, Sebastian, Fuchs, Hendrik, Gomm, Sebastian, Holland, Frank, Jäger, Julia, Kaiser, Jennifer, Keutsch, Frank N., Lohse, Insa, Lu, Keding, Tillmann, Ralf, Wegener, Robert, Wolfe, Glenn M., Mentel, Thomas F., Kiendler-Scharr, Astrid, and Wahner, Andreas

Published
2014

3. Amplified Trace Gas Removal in the Troposphere

Author

Hofzumahaus, Andreas, Rohrer, Franz, Lu, Keding, Bohn, Birger, Brauers, Theo, Chang, Chih-Chung, Fuchs, Hendrik, Holland, Frank, Kita, Kazuyuki, Kondo, Yutaka, Li, Xin, Lou, Shengrong, Shao, Min, Zeng, Limin, Wahner, Andreas, and Zhang, Yuanhang

Published
2009
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4. The South Asian monsoon—pollution pump and purifier

Author

Jos Lelieveld, Frank Holland, Efstratios Bourtsoukidis, Andreas Zahn, Andreas Hofzumahaus, Helmut Ziereis, Horst Fischer, Christoph Brühl, Hendrik Fuchs, Marco Neumaier, Andrea Pozzer, Daniel Marno, Hartwig Harder, Hans Schlager, and Jonathan Williams

Subjects
Pollution, Asia, Haze, 010504 meteorology & atmospheric sciences, Ozon, media_common.quotation_subject, Air pollution, Wind, 010501 environmental sciences, Monsoon, Atmospheric sciences, medicine.disease_cause, 01 natural sciences, Troposphere, Air Pollution, medicine, Asiatischer Monsoon, Stratosphere, 0105 earth and related environmental sciences, media_common, Institut für Physik der Atmosphäre, Air Pollutants, Multidisciplinary, Stickoxide, Hydroxylradika, Models, Theoretical, Atmospheric chemistry, Environmental science, Outflow, Seasons
Abstract

South Asian monsoon and pollution Air pollution is growing fastest in monsoon-impacted South Asia. During the dry winter monsoon, the fumes disperse toward the Indian Ocean, creating a vast pollution haze. The fate of these fumes during the wet summer monsoon has been unclear. Lelieveld et al. performed atmospheric chemistry measurements by aircraft in the Oxidation Mechanism Observations campaign, sampling the summer monsoon outflow in the upper troposphere between the Mediterranean and the Indian Ocean. The measurements, supported by model calculations, show that the monsoon sustains a remarkably efficient cleansing mechanism in which contaminants are rapidly oxidized and deposited on Earth's surface. However, some pollutants are lofted above the monsoon clouds and chemically processed in a reactive reservoir before being redistributed globally, including to the stratosphere. Science , this issue p. 270

Published
2018

5. Response to Comment on "Missing gas-phase source of HONO inferred from Zeppelin measurements in the troposphere"

Author

Li, X., primary, Rohrer, F., additional, Hofzumahaus, A., additional, Brauers, T., additional, Haseler, R., additional, Bohn, B., additional, Broch, S., additional, Fuchs, H., additional, Gomm, S., additional, Holland, F., additional, Jager, J., additional, Kaiser, J., additional, Keutsch, F. N., additional, Lohse, I., additional, Lu, K., additional, Tillmann, R., additional, Wegener, R., additional, Wolfe, G. M., additional, Mentel, T. F., additional, Kiendler-Scharr, A., additional, and Wahner, A., additional

Published
2015
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6. Response to Comment on 'Missing gas-phase source of HONO inferred from Zeppelin measurements in the troposphere'

Author

Frank N. Keutsch, Franz Rohrer, Sebastian Gomm, Andreas Wahner, Ralf Tillmann, Julia Jäger, J. Kaiser, Glenn M. Wolfe, Astrid Kiendler-Scharr, Robert Wegener, Thomas F. Mentel, Andreas Hofzumahaus, Birger Bohn, Xin Li, Insa Lohse, Frank Holland, Sebastian Broch, Keding Lu, Rolf Häseler, Theo Brauers, and Hendrik Fuchs

Subjects
Troposphere, Nitrous acid, chemistry.chemical_compound, Multidisciplinary, chemistry, Yield (chemistry), Environmental science, Atmospheric sciences, Nitrogen oxides, Gas phase
Abstract

Ye et al . have determined a maximum nitrous acid (HONO) yield of 3% for the reaction HO 2 ·H 2 O + NO 2 , which is much lower than the yield used in our work. This finding, however, does not affect our main result that HONO in the investigated Po Valley region is mainly from a gas-phase source that consumes nitrogen oxides.

Published
2015

7. Missing Gas-Phase Source of HONO Inferred from Zeppelin Measurements in the Troposphere.

Author

Xin Li, Rohrer, Franz, Hofzumahaus, Andreas, Brauers, Theo, Häseler, Rolf, Bohn, Birger, Broch, Sebastian, Fuchs, Hendrik, Gomm, Sebastian, Holland, Frank, Jäger, Julia, Kaiser, Jennifer, Keutsch, Frank N., Lohse, Insa, Keding Lu, Tillmann, Ralf, Wegener, Robert, Wolfe, Glenn M., Mentel, Thomas F., and Kiendier-Scharr, Astrid

Subjects
*NITROUS acid, *TROPOSPHERIC chemistry, *HYDROXYL group, *GAS phase reactions, *TROPOSPHERE
Abstract

Gaseous nitrous acid (HONO) is an important precursor of tropospheric hydroxyl radicals (OH). OH is responsible for atmospheric self-cleansing and controls the concentrations of greenhouse gases like methane and ozone. Due to tack of measurements, vertical distributions of HONO and its sources in the troposphere remain unclear. Here, we present a set of observations of HONO and its budget made onboard a Zeppelin airship. In a sunlit layer separated from Earth's surface processes by temperature inversion, we found high HONO concentrations providing evidence for a strong gas-phase source of HONO consuming nitrogen oxides and potentially hydrogen oxide radicals. The observed properties of this production process suggest that the generally assumed impact of HONO on the abundance of OH in the troposphere is substantially overestimated. [ABSTRACT FROM AUTHOR]

Published
2014
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8. Response to Comment on "Missing gas-phase source of HONO inferred from Zeppelin measurements in the troposphere'.

Author

Xin Li, Rohrer, Franz, Hofzumahaus, Andreas, Brauers, Theo, Häseler, Rolf, Bohn, Birger, Broch, Sebastian, Fuchs, Hendrik, Gomm, Sebastian, Holland, Frank, Jäger, Julia, Kaiser, Jennifer, Keutsch, Frank N., Lohse, Insa, Keding Lu, Tillmann, Ralf, Wegener, Robert, Wolfe, Glenn M., Mentel, Thomas F., and Kiendler-Scharr, Astrid

Subjects
*NITROUS acid, *NITROGEN oxides, *TROPOSPHERE, *NITROGEN dioxide
Abstract

Ye et al. have determined a maximum nitrous acid (HONO) yield of 3% for the reaction HO2·H2O + NO2, which is much lower than the yield used in our work. This finding, however, does not affect our main result that HONO in the investigated Po Valley region is mainly from a gas-phase source that consumes nitrogen oxides. [ABSTRACT FROM AUTHOR]

Published
2015
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