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4. 6.1 Background document

Author

Ole Hertel, Theobald, M., Cellier, P., Bleeker, A., Bruce, D., Lise Marie Frohn Rasmussen, Hill, R., Noordijk, E., Sharp, M., Pul, A., Zanten, M., Hicks, W. K., Whitfield, C. P., Bealey, W. J., and Sutton, M. A.

Published
2011

9. 6.2 Working group report

Author

Cellier, P., Theobald, M., Bleeker, A., Bruce, D., Lise Marie Frohn Rasmussen, Ole Hertel, Hill, R., Noordijk, E., Sharp, M., Pul, A., Zanten, M., Hicks, W. K., Whitfield, C. P., Bealey, W. J., and Sutton, M. A.

Published
2011

13. DEHM-Pollen: A regional scale pollen dispersion model

Author

Carsten Ambelas Skjøth, Jørgen Brandt, Jesper Heile Christensen, Lise Marie Frohn Rasmussen, Camilla Geels, Hansen, A. B., Kaj Mantzius Hansen, Gitte Brandt hedegaard, and Sommer, J.

Published
2009

15. Impacts of climate change on air pollution levels in the Northern Hemisphere with special focus on Europe and the Arctic

Author

Gitte Brandt hedegaard, Jørgen Brandt, Christensen, J., Lise Marie Frohn Rasmussen, Camilla Geels, Hansen, K. M., Stendel, M., National Environmental Research Institute, Danish Climate Centre, Danish Meteorological Institute (DMI), and EGU, Publication

Subjects
lcsh:Chemistry, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, lcsh:QD1-999, 010504 meteorology & atmospheric sciences, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, 13. Climate action, Luftforurening, modelering, 010501 environmental sciences, 01 natural sciences, lcsh:Physics, lcsh:QC1-999, Air Pollution Modelling, 0105 earth and related environmental sciences
Abstract

The response of a selected number of chemical species is inspected with respect to climate change. The coupled Atmosphere-Ocean General Circulation Model ECHAM4-OPYC3 is providing meteorological fields for the Chemical long-range Transport Model DEHM. Three selected decades (1990s, 2040s and 2090s) are inspected. The 1990s are used as a reference and validation period. In this decade an evaluation of the output from the DEHM model with ECHAM4-OPYC3 meteorology input data is carried out. The model results are tested against similar model simulations with MM5 meteorology and against observations from the EMEP monitoring sites in Europe. The test results from the validation period show that the overall statistics (e.g. mean values and standard deviations) are similar for the two simulations. However, as one would expect the model setup with climate input data fails to predict correctly the timing of the variability in the observations. The overall performance of the ECHAM4-OPYC3 setup as meteorological input to the DEHM model is shown to be acceptable according to the applied ranking method. It is concluded that running a chemical long-range transport model on data from a "free run" climate model is scientifically sound. From the model runs of the three decades, it is found that the overall trend detected in the evolution of the chemical species, is the same between the 1990 decade and the 2040 decade and between the 2040 decade and the 2090 decade, respectively. The dominating impacts from climate change on a large number of the chemical species are related to the predicted temperature increase. Throughout the 21th century the ECHAM4-OPYC3 projects a global mean temperature increase of 3 K with local maxima up to 11 K in the Arctic winter based on the IPCC A2 emission scenario. As a consequence of this temperature increase, the temperature dependent biogenic emission of isoprene is predicted to increase significantly over land by the DEHM model. This leads to an increase in the O3 production and together with an increase in water vapor to an increase in the number of free OH radicals. Furthermore this increase in the number of OH radicals contributes to a significant change in the typical life time of many species, since OH are participating in a large number of chemical reactions. It is e.g. found that more SO42− will be present in the future over the already polluted areas and this increase can be explained by an enhanced conversion of SO2 to SO42−.

Published
2008

16. A tree specie inventory over Europe

Author

Carsten Ambelas Skjøth, Camilla Geels, Martin Hvidberg, Ole Hertel, Jørgen Brandt, Lise Marie Frohn Rasmussen, Kaj Mantzius Hansen, Gitte Brandt hedegaard, Jesper Heile Christensen, and Lars Moseholm

Published
2008

18. Footprints on ammonia concentrations from emission regulations

Author

Ambelas Skjøth, C., Ole Hertel, Camilla Geels, Løfstrøm, P., Lise Marie Frohn Rasmussen, Frydendall, J., Ellermann, T., Gyldenkærne, S., Aneja, V. P., Schlesinger, W.H., Knighton, R., Jennings, G., Niyogi, D., Gilliam, W., Duke, C.S. (eds.), Schlesinger, W. H., Jennings, G., Gilliam, W., and Duke, C. S.

Published
2006

27. Luftudsigten for de næste 3 dage

Author

Jørgen Brandt, Christensen, J. H., Lise Marie Frohn Rasmussen, and Berkowicz, R.

Abstract

DSAR: Danish Society for Atmospheric Research

Published
2000

28. Comparison of Eulerian Ozone Prediction Systems within GLOREAM for Summer 1999 Using the German Monitoring Data

Author

Tilmes, S., Jørgen Brandt, Flatoy, F., Langner, J., Flemming, J., Bergström, R., Christensen, J. H., Ebel, A., Friedrich, R., Lise Marie Frohn Rasmussen, Heidegger, A., Hov, Ø., Jacobsen, I., Jacobs, H., Reimer, E., Stern, R., Wickert, B., and Zimmermann, J.

Subjects
Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Physics::Atmospheric and Oceanic Physics
Abstract

GLOREAM = GLobal and REgional Atmospheric Modelling.

Published
2000

32. Luftforurening - forskning for forebyggelse

Author

Ole Hertel, Thomas Ellermann, Per Løfstrøm, Steen Solvang Jensen, Ketzel, Matthias, Jørgen Brandt, Camilla Geels, Jesper Heile Christensen, Lise Marie Frohn Rasmussen, Jacob Klenø Nøjgaard, Ingeborg Elbæk Nielsen, Morten Winther, Marlene Schmidt Plejdrup, Ole-Kenneth Nielsen, and Maria Bech Poulsen

33. Atmospheric Input of Nitrogen into the North Sea: ANICE Project Overview

Author

Leeuw, G., Cohen, L., Lise Marie Frohn Rasmussen, Geernaert, G., Ole Hertel, Jensen, B., Jickells, T., Klein, L., Kunz, G. J., Lund, S., Moerman, M., Müller, F., Pedersen, B., Salzen, K., Schlünzen, K. H., Schulz, M., Ambelas Skjøth, C., L Sorensen, L., Spokes, L., Tamm, S., Vignati, E., and TNO Fysisch en Elektronisch Laboratorium

Subjects
Aerosols, ANICE, aerosol, Physics, atmospheric deposition, coastal zone, Gases, North Sea, Review, transport process, nitrogen
Abstract

The aim of the atmospheric nitrogen inputs into the coastal ecosystem (ANICE) project is to improve transport-chemistry models that estimate nitrogen deposition to the sea. To achieve this, experimental and modelling work is being conducted which aims to improve understanding of the processes involved in the chemical transformation, transport and deposition of atmospheric nitrogen compounds. Of particular emphasis within ANICE is the influence of coastal zone processes. Both short episodes with high deposition and chronic nitrogen inputs are considered in the project. The improved transport-chemistry models will be used to assess the atmospheric inputs of nitrogen compounds into the European regional seas (the North Sea is studied as a prototype) and evaluate the impact of various emission reduction strategies on the atmospheric nitrogen loads. Assessment of the impact of atmospheric nitrogen on coastal ecosystems will be based on comparisons of phytoplankton nitrogen requirements, other external nitrogen inputs to the ANICE area of interest and the direct nitrogen fluxes provided by ANICE. Selected results from both the experimental and modelling components are presented here. The experimental results show the large spatial and temporal variability in the concentrations of gaseous nitrogen compounds, and their influences on fluxes. Model calculations show the strong variation of both concentrations and gradients of nitric acid at fetches of up to 25km. Aerosol concentrations also show high temporal variability and experimental evidence for the reaction between nitric acid and sea salt aerosol is provided by size-segregated aerosol composition measured at both sides of the North Sea. In several occasions throughout the experimental period, air mass back trajectory analysis showed connected flow between the two sampling sites (the Weybourne Atmospheric Observatory on the North Norfolk coast of the UK and Meetpost Noordwijk, a research tower at 9km off the Dutch coast). Results from the METRAS/SEMA mesoscale chemistry transport model system for one of these cases are presented. Measurements of aerosol and rain chemical composition, using equipment mounted on a commercial ferry, show variations in composition across the North Sea. These measurements have been compared to results obtained with the transport-chemistry model ACDEP which calculates the atmospheric inputs into the whole North Sea area. Finally, the results will be made available for the assessment of the impact of atmospheric nitrogen on coastal ecosystems.

35. A tree species inventory over Europe

Author

Carsten Ambelas Skjøth, Camilla Geels, Martin Hvidberg, Ole Hertel, Jørgen Brandt, Lise Marie Frohn Rasmussen, Kaj Mantzius Hansen, Gitte Brandt hedegaard, Jesper Heile Christensen, and Lars Moseholm

45. Frigivelse af ammoniak fra havet

Author

Camilla Geels, Lise Marie Frohn Rasmussen, Martin Hvidberg, Ingela Dahllöf, Colin Stedmon, Mikael Hjorth Jensen, Jesper Heile Christensen, and Ole Hertel

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