Search Results - "Kokkola, H"

Effect of aerosol concentration and absorbing aerosol on the radiation fog life cycle by Maalick, Z., Kühn, T., Korhonen, H., Kokkola, H., Laaksonen, A., Romakkaniemi, S.

“…Analogous to cloud formation, the formation and life cycle of fogs is largely influenced by aerosol particles. The objective of this work is to analyze how…”
Get full text

Evaluation of observed and modelled aerosol lifetimes using radioactive tracers of opportunity and an ensemble of 19 global models by Kristiansen, N. I, Stohl, A, Olivié, D. J. L, Croft, B, Søvde, O. A, Klein, H, Christoudias, T, Kunkel, D, Leadbetter, S. J, Lee, Y. H, Zhang, K, Tsigaridis, K, Bergman, T, Evangeliou, N, Wang, H, Ma, P.-L, Easter, R. C, Rasch, P. J, Liu, X, Pitari, G, Di Genova, G, Zhao, S. Y, Balkanski, Y, Bauer, S. E, Faluvegi, G. S, Kokkola, H, Martin, R. V, Pierce, J. R, Schulz, M, Shindell, D, Tost, H, Zhang, H

“…Aerosols have important impacts on air quality and climate, but the processes affecting their removal from the atmosphere are not fully understood and are…”
Get full text

Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering by Laakso, A., Kokkola, H., Partanen, A.-I., Niemeier, U., Timmreck, C., Lehtinen, K. E. J., Hakkarainen, H., Korhonen, H.

“…Both explosive volcanic eruptions, which emit sulfur dioxide into the stratosphere, and stratospheric geoengineering via sulfur injections can potentially cool…”
Get full text

Chemical composition, main sources and temporal variability of PM1 aerosols in southern African grassland by Tiitta, P, Vakkari, V, Croteau, P, Beukes, J P, van Zyl, P G, Josipovic, M, Venter, A D, Jaars, K, Pienaar, J J, Ng, N L, Canagaratna, M R, Jayne, J T, Kerminen, V.-M, Kokkola, H, Kulmala, M, Laaksonen, A, Worsnop, D R, Laakso, L

“…Southern Africa is a significant source region of atmospheric pollution, yet long-term data on pollutant concentrations and properties from this region are…”
Get full text

A simple representation of surface active organic aerosol in cloud droplet formation by Prisle, N. L., Dal Maso, M., Kokkola, H.

“…Atmospheric aerosols often contain surface active organics. Surface activity can affect cloud droplet formation through both surface partitioning and surface…”
Get full text

Comprehensively accounting for the effect of giant CCN in cloud activation parameterizations by Barahona, D., West, R. E. L., Stier, P., Romakkaniemi, S., Kokkola, H., Nenes, A.

“…Large cloud condensation nuclei (CCN) (e.g., aged dust particles and seasalt) cannot attain their equilibrium size during the typical timescale of cloud…”
Get full text

The role of low volatile organics on secondary organic aerosol formation by Kokkola, H, Yli-Pirilä, P, Vesterinen, M, Korhonen, H, Keskinen, H, Romakkaniemi, S, Hao, L, Kortelainen, A, Joutsensaari, J, Worsnop, D. R, Virtanen, A, Lehtinen, K. E. J

“…Large-scale atmospheric models, which typically describe secondary organic aerosol (SOA) formation based on chamber experiments, tend to systematically…”
Get full text

Direct radiative effect by brown carbon over the Indo-Gangetic Plain by Arola, A, Schuster, G. L, Pitkänen, M. R. A, Dubovik, O, Kokkola, H, Lindfors, A. V, Mielonen, T, Raatikainen, T, Romakkaniemi, S, Tripathi, S. N, Lihavainen, H

“…The importance of light-absorbing organic aerosols, often called brown carbon (BrC), has become evident in recent years. However, there have been relatively…”
Get full text

Geographical and diurnal features of amine-enhanced boundary layer nucleation by Bergman, T., Laaksonen, A., Korhonen, H., Malila, J., Dunne, E. M., Mielonen, T., Lehtinen, K. E. J., Kühn, T., Arola, A., Kokkola, H.

“…Amines have recently been found to be an important ingredient in the nucleation and initial growth of atmospheric aerosols; however, global estimates of the…”
Get full text

A global process-based study of marine CCN trends and variability by Dunne, E. M, Mikkonen, S, Kokkola, H, Korhonen, H

“…Low-level clouds have a strong climate-cooling effect in oceanic regions due to the much lower albedo of the underlying sea surface. Marine clouds typically…”
Get full text

Climate and air quality trade-offs in altering ship fuel sulfur content by Partanen, A. I, Laakso, A, Schmidt, A, Kokkola, H, Kuokkanen, T, Pietikäinen, J.-P, Kerminen, V.-M, Lehtinen, K. E. J, Laakso, L, Korhonen, H

“…Aerosol particles from shipping emissions both cool the climate and cause adverse health effects. The cooling effect is, however, declining because of shipping…”
Get full text

MATCH-SALSA – Multi-scale Atmospheric Transport and CHemistry model coupled to the SALSA aerosol microphysics model – Part 1: Model description and evaluation by Andersson, C, Bergström, R, Bennet, C, Robertson, L, Thomas, M, Korhonen, H, Lehtinen, K. E. J, Kokkola, H

“…We have implemented the sectional aerosol dynamics model SALSA (Sectional Aerosol module for Large Scale Applications) in the European-scale…”
Get full text

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model by Makkonen, R., Asmi, A., Korhonen, H., Kokkola, H., Järvenoja, S., Räisänen, P., Lehtinen, K. E. J., Laaksonen, A., Kerminen, V.-M., Järvinen, H., Lohmann, U., Bennartz, R., Feichter, J., Kulmala, M.

“…The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type…”
Get full text

Insect Herbivory Caused Plant Stress Emissions Increases the Negative Radiative Forcing of Aerosols by Holopainen, E., Kokkola, H., Faiola, C., Laakso, A., Kühn, T.

“…Plant stress in a changing climate is predicted to increase plant volatile organic compound (VOC) emissions and thus can affect the formed secondary organic…”
Get full text

SALSA – a Sectional Aerosol module for Large Scale Applications by Kokkola, H., Korhonen, H., Lehtinen, K. E. J., Makkonen, R., Asmi, A., Järvenoja, S., Anttila, T., Partanen, A.-I., Kulmala, M., Järvinen, H., Laaksonen, A., Kerminen, V.-M.

“…The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and…”
Get full text

Climate impacts of changing aerosol emissions since 1996 by Kühn, T., Partanen, A.-I., Laakso, A., Lu, Z., Bergman, T., Mikkonen, S., Kokkola, H., Korhonen, H., Räisänen, P., Streets, D. G., Romakkaniemi, S., Laaksonen, A.

“…Increases in Asian aerosol emissions have been suggested as one possible reason for the hiatus in global temperature increase during the past 15 years. We…”
Get full text

Global modelling of direct and indirect effects of sea spray aerosol using a source function encapsulating wave state by Partanen, A.-I., Dunne, E. M., Bergman, T., Laakso, A., Kokkola, H., Ovadnevaite, J., Sogacheva, L., Baisnée, D., Sciare, J., Manders, A., O'Dowd, C., de Leeuw, G., Korhonen, H.

“…Recently developed parameterizations for the sea spray aerosol source flux, encapsulating wave state, and its organic fraction were incorporated into the…”
Get full text

Aerosol Effect on the Cloud Phase of Low‐Level Clouds Over the Arctic by Filioglou, M., Mielonen, T., Balis, D., Giannakaki, E., Arola, A., Kokkola, H., Komppula, M., Romakkaniemi, S.

“…Three years of nighttime Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation data was used in synergy with CloudSat measurements to quantify how…”
Get full text

Surfactant effects in global simulations of cloud droplet activation by Prisle, N. L., Asmi, A., Topping, D., Partanen, A.-I., Romakkaniemi, S., Dal Maso, M., Kulmala, M., Laaksonen, A., Lehtinen, K. E. J., McFiggans, G., Kokkola, H.

“…Atmospheric aerosols often contain surface active organics. We study the influence of these surfactants on predictions of particle cloud activation potential…”
Get full text

Modelling artificial sea salt emission in large eddy simulations by Maalick, Z., Korhonen, H., Kokkola, H., Khn, T., Romakkaniemi, S.

“…We study the dispersion of sea salt particles from artificially injected sea spray at a cloud-resolving scale. Understanding of how different aerosol processes…”
Get full text