ACACIA Publication list

Refereed publications

  • Rubén Rodríguez De León & David S Lee (2023). Contrail radiative dependence on ice particle number concentration. Environ. Res.: Climate 2(3), 035012, https://doi.org/10.1088/2752-5295/ace6c6.
  • Fuglestvedt, J., Lund, M. T., Kallbekken, S., Samset, B. H., & Lee, D. S. (2023). A“greenhouse gas balance”for aviation in line with the Paris Agreement.WIREs Climate Change, e839, https://doi.org/10.1002/wcc.839.
  • Li, Y., Mahnke, C., Rohs, S., Bundke, U., Spelten, N., Dekoutsidis, G., Groß, S., Voigt, C., Schumann, U., Petzold, A., and Krämer, M. 2023: Upper-tropospheric slightly ice-subsaturated regions: frequency of occurrence and statistical evidence for the appearance of contrail cirrus, Atmos. Chem. Phys., 23, 2251–2271, https://doi.org/10.5194/acp-23-2251-2023.
  • Maruhashi, J., Grewe, V., Frömming, C., Jöckel, P., and Dedoussi, I. C. 2022: Transport patterns of global aviation NOx and their short-term O3 radiative forcing a machine learning approach, Atmos. Chem. Phys., 22, 1425314282, https://doi.org/10.5194/acp-22-14253-2022.
  • Tully, C., Neubauer, D., Omanovic, N., and Lohmann, U. 2022: Cirrus cloud thinning using a more physically based ice microphysics scheme in the ECHAM-HAM general circulation model, Atmos. Chem. Phys., 22, 1145511484, https://doi.org/10.5194/acp-22-11455-2022 .
  • Wilhelm, L., Gierens, K., and Rohs, S. 2022: Meteorological Conditions that Promote Persistent Contrails. Applied Sciences, 12, 4450, https://doi.org/10.3390/app12094450.
  • Marjani, S., Tesche, M., Bräuer, P., Sourdeval, O., and Quaas, J. 2022: Satellite observations of the impact of individual aircraft on ice crystal number in thin cirrus clouds. Geophysical Research Letters 49, e2021GL096173, https://doi.org/10.1029/2021GL096173.
    • 2021 and older
  • Righi, M., Hendricks, J., and Beer, C. G. 2021: Exploring the uncertainties in the aviation sootcirrus effect, Atmos. Chem. Phys. 21, 17267-17289, https://doi.org/10.5194/acp-21-17267-2021.
  • Wilhelm L, Gierens K, Rohs S. 2021: Weather Variability Induced Uncertainty of Contrail Radiative Forcing. Aerospace 8(11):332, https://doi.org/10.3390/aerospace8110332
  • Klöwer, M., Allen, M. R., Lee, D. S., Proud, S. R., Gallagher, L., & Skowron, A. 2021. Quantifying aviation’s contribution to global warming. Environmental Research Letters 16(10), 104027, https://iopscience.iop.org/article/10.1088/1748-9326/ac286e
  • Mertens, M.; Jöckel, P.; Matthes, S.; Nuetzel, M.; Grewe, V., and Sausen, R. 2021: COVID-19 induced lower-tropospheric ozone changes. Environ. Res. Lett. 16(6), 064005, https://doi.org/10.1088/1748-9326/abf191.
  • Quaas, J.; Gryspeerdt, E.; Vautard, R.; and Boucher, O. 2021: Climate impact of aircraft-induced cirrus assessed from satellite observations before and during COVID-19. Environ. Res. Lett. 16, 064051, https://doi.org/10.1088/1748-9326/abf686.
  • Matthes, S.; Lim, L.; Burkhardt, U.; Dahlmann, K.; Dietmüller, S.; Grewe, V.; Haslerud, A.S.; Hendricks, J.; Owen, B.; Pitari, G.; Righi, M.; Skowron, A. 2021: Mitigation of Non-CO2 Aviation’s Climate Impact by Changing Cruise Altitudes. Aerospace 8(36), doi.org/10.3390/aerospace8020036.
  • Skowron, A., Lee, D.S., De León, R.R. et al. 2021: Greater fuel efficiency is potentially preferable to reducing NOx emissions for aviation’s climate impacts. Nat Commun 12(564), doi.org/10.1038/s41467-020-20771-3.
  • Gierens, K., Matthes, S., and Rohs, S. 2020: How Well Can Persistent Contrails Be Predicted? Aerospace, 7(169), doi.org/10.3390/aerospace7120169.

Non-refereed publications

Oral presentations

  • Gierens, K. and Hofer, S.: Cirrus clouds, ice supersaturation, and their dynamical background. Invited talk at the ICCP Workshop 'Clouds containing ice particles' in Mainz, Germany, 23-26 July 2023. Booklet.
  • Matthes, S., Gierens, K.: Climate effects of aviation - results of the ACACIA project. Invited talk at ETH Zurich, 11 May 2023. Invitation (in German only).
  • Sharma, M.: Double-box model for aircraft plumes (based on MADE3 microphysics), EMAC Symposium 2023, Mainz, Germany, 09–11 May 2023.
  • Purseed, J. and Bellouin, N.: Large Eddy Simulations of aerosol-cirrus interactions, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-5377.
  • Matthes, S., Nickl, A.-L., Peter, P., Mertens, M., Jöckel, P., Ziereis, H., Harlaß, T., and Zahn, A.: Aviation-induced changes of atmospheric composition in the UTLS in the multi-scale Earth system model MECO(1), EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-15843.
  • Yann Cohen, Didier Hauglustaine, Nicolas Bellouin, Sebastian Eastham, Marianne Tronstadt Lund, Sigrun Matthes, Agnieszka Skowron, and Robin Thor: Impact of aircraft NOx and aerosol emissions on atmospheric composition: a model intercomparison, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-8605.
  • Li, Y., Rohs, S., Krämer, M., and Petzold, A.: Does surface warming over Western Europe affect the occurrence frequency of contrail forming regions?, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-4629.
  • Maruhashi, J., Mertens, M., Grewe, V., and Dedoussi, I.: Assessing the appropriateness of different climate modelling approaches for the estimation of aviation NOx climate effects, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-9246.
  • Rao, P., Dwight, R., Singh, D., Maruhashi, J., Dedoussi, I., Grewe, V., and Frömming, C.: Towards a new surrogate model for predicting short-term NOx-O3 effects from aviation using Gaussian processes, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-4337.
  • Lee, David, Keith Shine, Piers Forster: Aviation non-CO2 climate science. Jet Zero Council Steering Group, 11 April 2023.
  • Sharma, M., Peter, P., Matthes, S.: Climate impact of aviation induced aerosols by modifying low-level clouds, European_Aviation@EASA conference 2023, Cologne, Germany, 23–24 March 2023.
  • Lee, David: Non-CO2 climate science update. Aviation climate impacts meeting of experts, National Academy of Sciences, 14 February, 2023.
  • Fuglestvedt, Jan: A 'greenhouse gas balance' for aviation in line with the Paris Agreement. TOZCA-AVIATE workshop, London, 1-2 February 2023.
    • 2022
  • Grewe, V., Matthes, S., Lee, D. Bellouin, N., Fuglestvedt, J.: Plenary session: Aviation climate impactws - round table, Clean Aviation - Advanced Combustion” Workshop, Invited panelists, Florence,IT and virtual, 24-25 October 2022.
  • Gierens Klaus, Wilhelm, L., Patrick Peter et al.: Forecasting conditions for contrail development, RAeS Greener by Design Specialist Group Event: The non-CO2 climate effects of aviation, London,UK and virtual, 20-21 September 2022.
  • Lee, David, Keith Shine, Piers Forster: Non-CO2 climate science update, RAeS Greener by Design Specialist Group Event: The non-CO2 climate effects of aviation, London,UK and virtual, 20-21 September 2022.
  • Li Y., C. Mahnke, S. Rohs, A. Petzold, and M. Krämer: Airborne observations of contrail cirrus over Europe and the Northeast Atlantic, TAC-5 International Conference, Germany 27-30 June 2022.
  • Durdina L., J. Edebeli, C. Spirig, M. Roth, B. Brem, D. Schönenberger, M. Elser and J. Anet: Certification versus research measurements: Investigating the variability of particle emissions of commercial jet engines from a long-running series of emission tests, TAC-5 International Conference, Germany 27-30 June 2022.
  • Mahnke C., R. Gomes, U. Bundke, M. Berg, H. Ziereis, M. Sharma, M. Righi, J. Hendricks, A. Zahn, and A. Petzold: Aviation induced aerosol within the UTLS: properties and processing observed from the IAGOS-CARIBIC Flying Laboratory, TAC-5 International Conference, Germany 27-30 June 2022.
  • Omanovic N., C. Tully, D. Neubauer, and U. Lohmann: Assessing the impact of non-CO2 air-craft emissions on cirrus cloud formation in ECHAM-HAM GCM, TAC-5 International Conference, Germany 27-30 June 2022.
  • Purseed J., N. Bellouin and E. Gilbert: Large Eddy Simulation of interactions between avia-tion-aerosols and cirrus clouds, TAC-5 International Conference, Germany 27-30 June 2022.
  • Righi M., J. Hendricks, and C. G. Beer: Exploring the uncertainties in the aviation soot-cirrus effect, TAC-5 International Conference, Germany 27-30 June 2022.
  • Testa, B., L. Durdina, J. Edebeli, C. Spirig, J. Anet and Z. A. Kanji: Ice nucleating properties of aircraft turbine engine soot particles with respect to cirrus clouds formations, TAC-5 International Conference, Germany 27-30 June 2022.
  • Tully C., D. Neubauer, N. Omanovic and U. Lohmann: Evaluating cirrus cloud thinning efficacy using prognostic seeding particles along flight tracks in the ECHAM-HAM GCM, TAC-5 International Conference, Germany 27-30 June 2022.
  • Wilhelm, L., K. Gierens, and S. Rohs: Towards a better prediction of persistent contrails using dynamical proxy variables, TAC-5 International Conference, Germany 27-30 June 2022.
  • Matthes, S.: Collaborative and inter-disciplinary Aeronautics Research in Europe on aviation and climate change. Invited evening lecture, TAC-5 International Conference, Germany 27-30 June 2022.
  • Matthes Sigrun, Klaus Gierens & ACACIA Project Team: Advancing the Science for Aviation and Climate: ACACIA. Developing improved understanding on aviation’s climate impact, ILA 2022, Aeronautics Session, Berlin, 22-26 June 2022.
  • Righi, M., Hendricks, J., and Beer, C. G.: Exploring the uncertainties in the aviation soot-cirrus effect, Aviation Emissions Characterization (AEC). Roadmap 20th Annual Meeting, 2426 May 2022.
  • Cohen, Y., Hauglustaine, D., Bellouin, N., Lund, M.T., Matthes, S., Petzold, A., Rohs, S., Skowron, A., Thouret, V., and Ziereis, H.: A multi-model assessment of atmospheric composi-tion in the UTLS with the IAGOS database, in the frame of the ACACIA EU project, EGU General Assembly 2022, Vienna 23-27 May 2022.
  • Sajedeh Marjani, Matthias Tesche, Peter Bräuer, Odran Sourdeval, and Johannes Quaas (2022): Satellite observations of the impact of individual aircraft on ice crystal number in cirrus clouds, EGU Genaral Assembly 2022 Highlight, Vienna 23-27 May 2022.
  • Yun Li, Mahnke, C., Rohs, S., Bundke, U., Spelten, N., Dekoutsidis, G., Groß, S., Voigt, C., Schumann, U., Petzold, A., and Krämer, M. (2022): Observations of contrail cirrus in ice-subsaturated environments and implications for mitigating the climate impact of aviation, EGU General Assembly 2022 Highlight, Vienna, Austria, 2327 May 2022, EGU22-7830.
  • Baptiste Testa, Lukas Durdina, Jacinta Edebeli, Curdin Spirig, Julien Anet and Zamin A. Kanji (2022): Ice nucleating properties of aircraft turbine engine soot particles with respect to cirrus clouds formations, EGU General Assembly 2022, Vienna 23-27 May 2022.
  • Jin Maruhashi, Volker Grewe, Christine Frömming, Patrick Jöckel, and Irene Dedoussi (2022): A Lagrangian study of globally emitted aviation NOx and associated short-term O3 radiative forcing effects, , EGU General Assembly 2022, Vienna 23-27 May 2022, EGU22-6646.
  • Christoph Mahnke, Rita Gomes, Ulrich Bundke, Marcel Berg, Helmut Ziereis, Monica Sharma, Mattia Righi, Johannes Hendricks, Andreas Zahn, and Andreas Petzold (2022): Properties and processing of aviation induced aerosol within the UTLS observed from the IAGOS-CARIBIC Flying Laboratory, , EGU General Assembly 2022, Vienna 23-27 May 2022, EGU22-908.
  • Righi, M. (2022): Exploring the uncertainties in the aviation soot-cirrus effect. Seminar of the DLR Institute of Atmospheric Physics, 2 February 2022, virtual.
    • 2021
  • Quaas J. (2021): Climate impact of aircraft-induced cirrus assessed from satellite observations before and during COVID-19. Atmospheric physics seminar, University of Warsaw, 17 December 2021, virtual. Download presentation (pdf 5 MB).
  • Tully, C., Neubauer, D., Omanovic, N. and Lohmann, U. (2021): A climate engineering dead end? Cirrus cloud thinning fails to produce cooling even with more physically based ice microphysics in the ECHAM-HAM GCM. AGU 2021, 15 December 2021, New Orleans, USA.
  • Righi, M., Hendricks, J., and Beer, C.G. (2021): Exploring the uncertainties in the aviation soot-cirrus effect. European Aerosol Conference 2021, Session: AE1 Aviation Emissions, 3 September 2021, virtual. Extended abstract.
  • Matthes, S., Gierens, K. and ACACIA team (2021): ACACIA: Developing improved understanding on aviation's climate impact. 11. EASN International Conference, 2 September 2021, virtual.
  • Omanovic, N. (2021): Modelling of ice clouds in a state-of-theart global circulation model. 11. EASN International Conference, 2 September 2021, virtual.
  • Li, Y., Mahnke, C., Rohs, S., Petzold, A., and Krämer, M. (2021): Occurrences of natural and contrail cirrus and their microphysical properties observed from in-situ measurements. 11. EASN International Conference, 2 September 2021, virtual.
  • Mahnke C., Gomes R., Bundke U., Petzold A., Ziereis H., and Zahn A. (2021): Aviation impact on atmospheric aerosol observed from IAGOS-CARIBIC flying laboratory. eGMAC 2021, 27 May 2021, virtual. Abstract, Recording of session.
  • Quaas J., Gryspeerdt E., Vautard R., and Boucher O. (2021): Climate impact of aircraft-induced cirrus assessed from satellite observations before and during COVID-19. EGU21, 27 April 2021, virtual. Presentation.
  • Dollner, M., Josef Gasteiger, Manuel Schöberl, Glenn Diskin, T. Paul Bui, Charles A. Brock, and Bernadett Weinzierl (2021): Global in-situ cloud phase observations during the airborne Atmospheric Tomography mission and A-LIFE field experiment. EGU21, 27 April 2021, virtual. Abstract and summary.
  • Skowron, A. (2021): Effect of future atmospheric background composition on NOx climate impact in the longer term. RAeS Conference: Mitigating the climate impact of non-CO2 Aviation’s low-hanging fruit, 23-24 March 2021, virtual.
  • Grewe, V. (2021): Current assessment of NOx impact and dependence on time and place of emissions. RAeS Conference: Mitigating the climate impact of non-CO2 Aviation’s low-hanging fruit, 23-24 March 2021, virtual.
  • Sausen, R. (2021): Climate impact of Aviation's non-CO2 emissions - An overview. RAeS Conference: Mitigating the climate impact of non-CO2 Aviation’s low-hanging fruit, 23-24 March 2021, virtual.
  • Gierens, K. M. (2021): Contrail Statistics, Big Hits and Predictability. RAeS Conference: Mitigating the climate impact of non-CO2 Aviation’s low-hanging fruit, 23-24 March 2021, virtual.
    • 2020
  • Terrenoire, E. and Hauglustaine,D. 2020: Impact of present and future aircraft emissions on atmospheric composition. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, Gothenburg, Sweden.
  • Grewe, V., Matthes, S., and Dahlmann, K. 2020: The Contribution of Aviation NOx Emissions to Climate Change. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, Gothenburg, Sweden.
  • Yin, F., Grewe, V., and Gierens, K. 2020: Impact on Contrails Coverage when Flying with Hybrid Electric Aircraft. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, Gothenburg, Sweden.
  • Gierens, K., Rohs, S., Matthes, S. 2020: Contrail Formation Conditions and Instantaneous Radiative Forcing. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, virtual.
  • Frömming, C., Grewe, V., Brinkop, S., Haslerud, A., Rosanka, S., van Manen, J., and Matthes, S. 2020: Weather and Location Dependency of Aviation Climate Effects: 4-D-Climate-Change-Functions. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, virtual.
  • Yamashita, H., Yin, F., Grewe, V., Jöckel, P., Matthes, S., Kern, B., Dahlmann, K., and Frömming, C. 2020: Comparison of Various Aircraft Routing Strategies Using the AirTraf 2.0. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, virtual.
  • Lee, D., D. Fahey, and J.S. Fuglestvedt, 2020: Climate change and aviation. Online Stocktaking Preview, 28 April 2020, in preparation for the ICAO Stocktaking Seminar on in-sector CO2 emissions reductions, which has been rescheduled to 8-10 September 2020 at ICAO Headquarters, Montreal. Download presentation (pdf 3.7 MB).
  • Matthes, S., Lührs B., Linke F., Grewe V., Dahlmann K., Yin F., and Shine K. 2020: Mitigation potential of climate-optimized routing: concept study for Europe. AEC, 25-28 February 2020, Bordeaux, France. Download extended abstract.

Poster

  • Li, Yun, Christoph Mahnke, Susanne Rohs, Ulrich Bundke, Andreas Petzold, and Martina Krämer: Cirrus clouds, ice supersaturation, and their dynamical background. ICCP Workshop 'Clouds containing ice particles' in Mainz, Germany, 23-26 July 2023. Booklet.
  • Cohen Y., D. Hauglustaine, N. Bellouin, M. Tronstadt Lund, S. Matthes and A. Skowron: Impact of aircraft NOx and aerosol emissions on atmospheric composition: a model intercomparison, TAC-5 International Conference, Germany 27-30 June 2022.
  • Sharma M., M. Righi, J. Hendricks, C. Mahnke, A. Petzold, D. Sauer and V. Grewe: Towards an improved estimate of aviation-aerosol effect on low level clouds, TAC-5 International Conference, Germany 27-30 June 2022.
  • Matthes S., P. Peter, M. Mertens, Y. Cohen, D. Hauglustaine, P. Jöckel, H. Ziereis, A. Zahn, A. Kerkweg and A. Petzold: Comparing reactive species aircraft observations with EMAC global chemistry-climate model simulation, TAC-5 International Conference, Germany 27-30 June 2022.
  • Matthes S., N. Bellouin, I. Dedoussi, J. Fuglestvedt, K. Gierens, D. Hauglustaine, Z. Kanji, M. Krämer, D. Lee, U. Lohmann, A. Petzold, J. Quaas, M. Righi, B. Weinzierl, S. Baumann, R. Sausen and J. Anet: ACACIA: Improved understanding on aviation’s climate effects thru com-bination of numerical modelling and observations, TAC-5 International Conference, Germany 27-30 June 2022.
  • Sajedeh Marjani, Matthias Tesche, Peter Bräuer, Odran Sourdeval, and Johannes Quaas; Aviation impact on the number of ice crystals in already existing thin cirrus clouds, TAC-5 International Conference, Germany 27-30 June 2022.
  • Finke, M., S. Matthes, A. Tedeschi, G. Alonso, I. Stasicka, S. Baumann and the ACGA team: First results of EU funded aeronautic projects, TAC-5 International Conference, Germany 27-30 June 2022.
    • 2021 and older
  • Mertens, M.; Jöckel, P.; Matthes, S.; Nuetzel, M.; Grewe, V., and Sausen, R. 2021: COVID-19 induced lower-tropospheric ozone changes. 16th IGAC Scientific Conference 2021. 12-17 September 2021, virtual.
  • Cohen Y., Hauglustaine D., Sauvage B., Rohs S., Petzold A., Ziereis H., Thouret V. 2021: On the use of in-service aircraft observations for the assessment of a long-term chemistry-climate simulation in the UTLS. 16th IGAC Scientific Conference 2021. 12-17 September 2021, virtual.
  • Maruhashi J., Dedoussi I., Grewe V. 2021: Clustering of ATTILA Trajectories using a Neuroscience Algorithm (QuickBundles) for the Characterization of Emission Transport Pathways. 10th Annual EMAC Symposium 2021. 31 May-02 June 2021, virtual.
  • Dedoussi, I. 2020: Future air quality implications of decision-making for sustainable aviation. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, Gothenburg, Sweden.
  • Sausen, R., Gierens, K., Matthes, S., and the ACACIA Project team: The EU project ACACIA (Advancing the Science for Aviation and ClimAte). 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, Gothenburg, Sweden.
  • ACGA 2020: AGCA cluster for aviation operations impact on climate change. 3rd ECATS Conference, Making aviation environmentally sustainable. 13-15 October 2020, Gothenburg, Sweden.

Policy consultation

  • German Federal Chancellery: Robert Sausen is invited to an industry and policy related Expert Discussion in the German Federal Chancellery, Topic: Challenge 'Green Deal'. Alternative and disruptive propulsion technology in aviation. 19 January 2021.

Press releases / Public affairs material

Prices

  • TU Delft: Best Climate Science Paper of 2022 Award and Climate Action prize for Jin Maruhashi, PhD candidate at TU Delft, March 2023.

Media appearances

Print

  • Interview with Sigrun Matthes (DLR): Following the yellow brick road (English) / Auf der richtigen Spur (German). DLR Magazin 164, April 2020.
  • English version (pdf 12 MB)
  • Deutsche Ausgabe (pdf 10 MB)

Broadcast

  • BBC News: Radio interview and short video presentation about aviation, climate, and Covid-19 on by Marianne Tronstad Lund (Cicero), August/September 2020.
  • Radio interview
  • Short video

Deliverables

List of deliverables
Number Name
D1.1 Report on the observational climatology of cloud active aviation aerosol, including ice nucleating abilities of contrail processed INPs
This deliverable describes the aviation aerosol climatology extracted from IAGOS data and first analyses based on these data. It describes in a second part the results from the laboratory measurements on real aircraft soot.
D1.2 Report on the impact of aviation aerosol on cirrus radiative properties as a function of weather conditions and sensitivity to cloud process representation as derived from LES and GCMs
This deliverable describes the outcomes of Task 1.2, which is the basis for assessments of the corresponding radiative forcing. Uncertainties are estimated using sensitivity studies by mutually comparing results from two cloud-resolving models, by comparing their results from two global models, by using two different emission inventories, by comparison of certain scenes with matching satellite observation data and by exploring different cloud parameterisation settings.
D1.3 Quantification and evaluation of the importance of the aviation aerosol interactions with low level clouds
The impact of aviation-emitted aerosol on low-level clouds is potentially very large, but the uncertainty of this effect is particularly large as well. The deliverable will describe new modelling results using an updated aerosol dynamics scheme. Second, the paths over which the cruise-emitted aerosol is transported to low level clouds will be shown and it will be quantified which fraction of the aerosol impact on lowlevel clouds can be attributed to cruise-level flights and which to aircraft operations near airports.
D2.1 Report on spatio temporal patterns of occurrence probabilities and properties of contrails and contrail cirrus including atmospheric conditions favourable for their formation
This deliverable takes the IAGOS, JULIA, and ATom data bases to characterise situations which give rise to persistent contrails and contrail cirrus.
D2.2 Report on statistics of instantaneous radiative forcing and meteorological conditions where the strongest contrails appear
This deliverable provides statistics of the instantaneous radiative forcing (iRF) of persistent contrails that are found in the IAGOS and JULIA data bases. Analyses of the meteorological conditions giving rise to particularly large positive iRF will be provided as well.
D2.3 Report on the observational climatology of cloud active aviation aerosol, including ice nucleating abilities of contrail processed INPs
This deliverable describes the results of sensitivity studies with a chemistry-climate model. The model is used to find out whether there are interactions and trade-offs between different aviation effects, that is, whether improvements for climate in one aspect can incorporate deteriorations for climate in other aspects.
D2.4 Report on interhemispheric contrasts regarding spatial and temporal distribution of ice cloud properties (in particular, ice crystal number concentration) with focus on the undisturbed background atmosphere
This deliverable describes analyses based on the ATom data set. While the majority of IAGOS and JULIA data are from the polluted northern hemisphere (i.e., data with aviation influence), ATom has data from clean areas of the southern hemisphere as well. This allows to compare the situation in polluted versus unpolluted regions of the world.
D2.5 Report or publication on satellite assessment of aviation impact on cirrus
In this deliverable, satellite data and model simulations are used to find out whether (and how) aviation aerosol effects on cirrus cloud microphysics are detectable from space, whether there are subsequent effects on bulk (macrophysical) cloud properties and what the consequences are for their radiative effects.
D3.1 Report on methodological gaps in addressing the climate effects of aviation by field campaigns
This deliverable collects results from a literature study and provides lessons learned. It is the groundwork for setting up concepts for new measurement campaigns.
D3.2 Report on favourable atmospheric situations for aviation-induced effects
This deliverable characterises meteorological conditions where aviation emissions have a particularly strong effect on clouds and atmospheric compositions and where such effects can be detected, that is, where the signal-to-noise ratio is sufficiently large.
D3.3 Field Campaign Design White Paper
The "Field Campaign White Paper" provides a synopsis of evidence for aviation induced climate impacts, and will lay the ground for the detailed mission design and strategies.
D4.1 Assessment/synthesis comprising CO2 and non-CO2 effects of present-day aviation and implications of uncertainties for the quantification of future warming contributions from the sector
This deliverable provides a new IPCC-type effects diagram with new values for best estimates and new uncertainty estimates. The differences between the old and the new numbers quantify the impact of ACACIA on our scientific understanding.
D4.2 Synthesis publication on technological tradeoffs and associated climate impact
This deliverable shows the mitigation potential for the future aviation system under various technology pathways. Especially it demonstrates and clarifies trade-offs between various options.
D4.3 Synthesis publication/white paper on robustness assessment comprising trade-offs in green flight trajectory planning
This deliverable shows how robust decisions can be obtained when information is fraught with uncertainty of various origin. Using such methods it formulates recommendations for robust mitigation strategies.
D4.4 Synthesis publication/white paper on overall possible reductions of non-CO2 effects towards Paris Agreement temperature goals
This deliverable shows the implications of various possible interpretations of the Paris Agreement for mitigation strategies and how the aviation sector can align with the ambitions set out in the Agreement.
D5.1 Strategic roadmap and agenda available for scientific assessments, i.e., IPCC, WMO
This deliverable is to help organisation of the dissemination of scientific results of ACACIA into international assessments (e.g. IPCC).
D5.2 Synthesis operational solutions envisaged for reducing aviation emissions
This deliverable provides climate change functions, which quantify first-order atmospheric sensitivities, updated for the new results on aerosol-cloud interaction.
D5.4 Synthesis report on dissemination and wider distribution, lesson learnt
This deliverable serves as an instrument to monitor the success of ACACIA's dissemination and communication activities. It provides lessons learnt.
D6.3 Summary publication of the main results of ACACIA
This deliverable is a publication in a scientific journal (Open Access). At the end of the project it will be ready for submission.

Young students: Thesis work

Completed
  • PhD: Maximilian Dollner, UVIE, 2022: "Assessment of the global distribution of coarse-mode aerosol and clouds with large-scale in situ aircraft observations"
  • PhD: Colin Tully, ETHZ, 2023: "Cirrus climate intervention: Sensitivity analysis of aerosol-ice-cloud interactions"
  • MSc: Judith Hahofer, UVIE, 2023: "Case study on the identification of air traffic emissions in ice clouds during the Atmospheric Tomography (ATom) Mission"
  • MSc: Lena Wilhelm, DLR, 2022: "Meteorological conditions for strongly warming contrails and the statistics of contrail´s instantaneous radiative forcing"
  • MSc: Nadja Omanovic, ETHZ, 2021: "Non-CO2 climate impacts of aviation"

Ongoing

  • PhD: Jin Maruhashi, TUD, start 2020: "On the link between aviation emission transport pathways and their climate impacts"
  • PhD: Sajedeh Marjani, ULEI, start 2020: "Aviation impact on cirrus clouds: analysis of satellite observations and modelling"
  • PhD: Monica Sharma, DLR/TUD, start 2020: "The climate impact of aviation-induced aerosols by modifying low level clouds"
  • PhD: Baptiste Testa, ETHZ, start 2020: "Ice nucleation abilities of aircraft soot at cirrus temperatures"