A5045764902- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Fire effects on ecosystems
- Air Quality Monitoring and Forecasting
- Aeolian processes and effects
- Air Quality and Health Impacts
- Vehicle emissions and performance
- Remote Sensing in Agriculture
- Solar Radiation and Photovoltaics
- Remote Sensing and LiDAR Applications
- Transportation Planning and Optimization
- Climate Change Communication and Perception
- Environmental Education and Sustainability
- Wind and Air Flow Studies
- Cryospheric studies and observations
- Calibration and Measurement Techniques
- Particle Dynamics in Fluid Flows
- Thermochemical Biomass Conversion Processes
- Financial Risk and Volatility Modeling
- Solar Thermal and Photovoltaic Systems
- Precipitation Measurement and Analysis
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
Finnish Meteorological Institute
2016-2025
Eastern Finland Laboratory Center
2024
Royal Netherlands Meteorological Institute
2013-2015
Finnish Geospatial Research Institute
2006
Uncertainty in the representation of biomass burning (BB) aerosol composition and optical properties climate models contributes to a range modeled effects on incoming solar radiation. Depending model, top-of-the-atmosphere BB effect can from cooling warming. By relating absorption relative extinction carbonaceous 12 observational datasets nine state-of-the-art Earth system models/chemical transport models, we identify varying degrees overestimation absorptivity by these models. Modifications...
Identification of aerosol types is important, because different have effects on health, visibility and climate change. The space‐borne lidar CALIOP on‐board the CALIPSO satellite provides information aerosols in separate layers that can be detected with this instrument. In study, subtypes measurements are compared daily derived from AERONET level 2.0 inversion data. categorized by single scattering albedo Ångström exponent values. comparison shows 70% agreement. Best agreement achieved for...
Abstract Optically thick smoke aerosol plumes originating from biomass burning (BB) in the southwestern African Savanna during austral spring are transported westward by free tropospheric winds to primarily overlie vast stretches of stratocumulus cloud decks southeast Atlantic. We evaluated simulations long‐range transport BB Goddard Earth Observing System (GEOS‐5) and four other global models over complete South African‐Atlantic region using Cloud‐Aerosol Lidar with Orthogonal Polarization...
Abstract. In this paper, we present the implementation and evaluation of aerosol microphysics module SALSA2.0 in framework aerosol–chemistry–climate model ECHAM-HAMMOZ. It is an alternative to default modal scheme M7 The within ECHAM-HAMMOZ evaluated against observations optical properties, mass, size distributions, comparing also skill implementation. largest differences between are methods used for calculating microphysical processes, i.e., nucleation, condensation, coagulation, hydration....
Abstract Aerosol particles cool the climate by scattering solar radiation and acting as cloud condensation nuclei. Higher temperatures resulting from increased greenhouse gas levels have been suggested to lead biogenic secondary organic aerosol nuclei concentrations creating a negative feedback mechanism. Here, we present direct observations on this mechanism utilizing collocated long term chemical composition measurements remote sensing properties. Summer time loadings showed clear increase...
Abstract. In May–June 2019, smoke plumes from wildfires in Alberta, Canada, were advected all the way to Europe. To analyze evolution of and estimate amount aerosols transported Europe, retrievals spaceborne lidar CALIOP (Cloud-Aerosol LIdar with Orthogonal Polarization) used. The located help a trajectory analysis, masses retrieved observations. accuracy mass was compared ground-based lidars/ceilometer near source North America after long-range transport Overall, produced comparable...
Abstract. We present the implementation and evaluation of a sectional aerosol microphysics module SALSA within aerosol-climate model ECHAM5-HAM. This has been designed to be flexible computationally efficient so that it can implemented in regional or global scale models. The computational efficiency achieved by minimising number variables needed describe size composition distribution. distribution is described using 10 classes with parallel sections which have different chemical...
Abstract. Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa throughout 2010. The height planetary boundary layer (PBL) top was continuously measured using a Raman lidar, PollyXT (POrtabLe Lidar sYstem eXTended). High atmospheric variability together with large surface temperature range and significant seasonal changes precipitation observed, which had an impact vertical...
Abstract Amines have recently been found to be an important ingredient in the nucleation and initial growth of atmospheric aerosols; however, global estimates spatial temporal extent amine‐enhanced are currently missing. We utilize two published laboratory data sets amine‐sulfuric acid evaluate accuracy previously parameterizations produce a new particle formation (NPF) parameterization that better reproduces observations at atmospherically relevant sulfuric concentrations. implement compare...
Abstract Natural aerosol feedbacks are expected to become more important in the future, as anthropogenic emissions decrease due air quality policy. One such feedback is initiated by increase biogenic volatile organic compound (BVOC) with higher temperatures, leading secondary (SOA) production and a cooling of surface via impacts on cloud radiative properties. Motivated considerable spread strength Earth System Models (ESMs), we here use two long-term observational datasets from boreal...
Abstract. One year of multi-wavelength (3 backscatter + 2 extinction 1 depolarization) Raman lidar measurements at Gual Pahari, close to New Delhi, were analysed. The data was split into four seasons: spring (March–May), summer (June–August), autumn (September–November) and winter (December–February). vertical profiles backscatter, extinction, ratio their variability during each season are presented. revealed that, on average, the aerosol layer its highest in (5.5 km). In summer, vertically...
Abstract Active vegetation fires in south‐eastern (SE) Europe resulted a notable increase the number concentration of aerosols and cloud condensation nuclei (CCN) particles at two high latitude locations—the SMEAR IV station Kuopio, Finland, Zeppelin Observatory Svalbard, Arctic. During fire episode aerosol hygroscopicity κ slightly increased decreased. Despite CCN conditions IV, activation diameter due to decreased supersaturation with an loading. In addition, during episode, situ measured...
Abstract. Aerosol physical and optical properties were measured at two locations in northern India. The first measurement station was a background site Mukteshwar, about 350 km northeast of New Delhi, the foothills Indian Himalayas, with data from 2006 to 2009. second located Gual Pahari, 25 south 2008 At both stations, average aerosol concentrations during monsoon decreased by 40–75 % compared pre-monsoon concentrations. decrease varied total local rainfall. In season removed particles all...
Abstract. Aerosol Optical Depth (AOD) and Ångström exponent (AE) values derived with the MODIS retrieval algorithm over land (Collection 5) are compared ground based sun photometer measurements at eleven sites spanning globe. Although, in general, total AOD compares well these (R2 generally 0.8), there cases (from 2 to 67% of depending on site) where clearly retrieves wrong spectral dependence, hence, an unrealistic AE value. Some poor retrievals due aerosol signal being too small (total...
Abstract. Chemistry transport models (CTMs) are an indispensable tool for studying and predicting atmospheric climate effects associated with carbonaceous aerosol from open biomass burning (BB); this type of is known to contribute significantly both global radiative forcing episodes air pollution in regions affected by wildfires. Improving model performance requires systematic comparison simulation results measurements BB elucidation possible reasons discrepancies between them, which,...
Abstract. We have developed a Bayesian aerosol retrieval (BAR) algorithm for the of optical depth (AOD) over land from Moderate Resolution Imaging Spectroradiometer (MODIS). In BAR algorithm, we simultaneously retrieve all dark pixels in granule, utilize spatial correlation models unknown parameters, use statistical prior model surface reflectance, and take into account uncertainties due to fixed models. The retrieved parameters are total AOD at 0.55 µm, fine-mode fraction (FMF),...
Abstract. The response in cloud water content to changes condensation nuclei remains one of the major uncertainties determining how aerosols can perturb properties. In this study, we used an ensemble large eddy simulations marine stratocumulus clouds investigate correlation between liquid path and amount nuclei. We compare directly from model derived using equations which are retrieve satellite observations. Our comparison shows that spatial variability properties instrumental noise...
Abstract. We assessed the biomass burning (BB) smoke aerosol optical depth (AOD) simulations of 11 global models that participated in AeroCom phase III BB emission experiment. By comparing multi-model and satellite observations vicinity fires over 13 regions globally, we (1) assess model-simulated AOD performance as an indication source–strength, (2) identify where common dataset used by might underestimate or overestimate sources, (3) model diversity underlying causes much possible. Using...
Abstract. The response in cloud water content to changes condensation nuclei remains one of the major uncertainties determining how aerosols can perturb properties. In this study, we used an ensemble large eddy simulations marine stratocumulus clouds investigate correlation between liquid path (LWP) and amount nuclei. We compare directly from model derived using equations which are retrieve satellite observations. Our comparison shows that spatial variability properties instrumental noise...
In recent years, fire activity at high latitudes has reached unprecedented levels, driven in part by global warming, which increases danger. Climate projections of risk rely on indices like the Canadian Forest Fire Weather Index (FWI), are often derived from coarse-resolution climate models. Thus, there is need for finer-scale weather to enable more effective planning and resource allocation as wildfire threats grow. High-resolution can be achieved through various methods, including...