A5011996188- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Atmospheric chemistry and aerosols
- Solar Radiation and Photovoltaics
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Tree-ring climate responses
- Oceanographic and Atmospheric Processes
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Marine and coastal ecosystems
- Ionosphere and magnetosphere dynamics
- Seismic Waves and Analysis
- Lightning and Electromagnetic Phenomena
- Tropical and Extratropical Cyclones Research
- Grey System Theory Applications
- Earthquake Detection and Analysis
- Fire effects on ecosystems
- Nuclear Issues and Defense
- Archaeology and ancient environmental studies
- Water Quality Monitoring and Analysis
- Nuclear and radioactivity studies
- Stellar, planetary, and galactic studies
National Observatory of Athens
2021-2024
Aarhus University
2019-2024
Academy of Athens
2024
University of Oxford
2017-2021
Democritus University of Thrace
2021
EDP Sciences
2020
Aristotle University of Thessaloniki
2013-2017
Max Planck Institute for Meteorology
2012-2013
Max Planck Society
2012
Abstract. This paper describes the recommended solar forcing dataset for CMIP6 and highlights changes with respect to CMIP5. The is provided radiative properties, namely total irradiance (TSI), spectral (SSI), F10.7 index as well particle forcing, including geomagnetic indices Ap Kp, ionization rates account effects of protons, electrons, galactic cosmic rays. first time that a recommendation solar-driven has been CMIP exercise. datasets are at daily monthly resolution separately...
Abstract We describe and evaluate historical simulations which use the third Hadley Centre Global Environment Model in Coupled configuration 3.1 (HadGEM3‐GC3.1) form part of UK's contribution to sixth Intercomparison Project, CMIP6. These simulations, run at two resolutions, respond historically evolving forcings such as greenhouse gases, aerosols, solar irradiance, volcanic land use, ozone concentrations. assess response these compare against observational record. This includes evolution...
The 11 year solar‐cycle component of climate variability is assessed in historical simulations models taken from the Coupled Model Intercomparison Project, phase 5 (CMIP‐5). Multiple linear regression applied to estimate zonal temperature, wind and annular mode responses a typical solar cycle, with focus on both stratosphere stratospheric influence surface over period ∼1850–2005. analysis performed all CMIP‐5 but focuses 13 that resolve (high‐top models) compares simulated cycle signature...
A multiple linear regression analysis of nine different reanalysis datasets has been performed to test the robustness variability associated with volcanic eruptions, El Niño Southern Oscillation, Quasi‐Biennial Oscillation and a specific focus on 11‐year solar cycle. The covers both stratosphere troposphere extends over period 1979–2009. characteristic signals all four sources are remarkably consistent between confirm responses seen in previous analyses. In general, signatures reported...
The surface response to the 11 year solar cycle is assessed in ensemble simulations of twentieth century climate performed framework fifth phase Coupled Model Inter‐Comparison Project (CMIP5). A lead/lag multiple linear regression analysis identifies a multi‐model mean (MMM) global warming about 0.07 K, lagging by 1–2 years on average. anomalous penetrates approximately first 80–100 m depth ocean. Solar signals troposphere show similar time lag and strongest MMM simulated Tropics above 300...
Abstract Variations in the solar spectral irradiance (SSI) are an important driver of chemistry, temperature, and dynamics Earth's atmosphere ultimately climate. To investigate detailed response to SSI variations, a reliable data set is needed. We present observational composite that based on 20 instruments has been built by using probabilistic approach takes into account scale‐dependent uncertainty each available observation. compare variability this new with reconstructions discuss...
A multiple linear regression statistical method is applied to model data taken from the Coupled Model Intercomparison Project, phase 5 (CMIP‐5) estimate 11‐year solar cycle responses of stratospheric ozone, temperature, and zonal wind during 1979–2005 period. The analysis limited six CMIP‐5 models which resolve stratosphere (high‐top models) include interactive ozone chemistry. All simulations assumed a conservative spectral irradiance (SSI) variation based on Naval Research Laboratory...
The Pacific Walker Circulation (PWC) fluctuates on interannual and multidecadal timescales under the influence of internal variability external forcings. Here, we provide observational evidence that 11-y solar cycle (SC) affects PWC decadal timescales. We observe a robust reduction east-west sea-level pressure gradients over Indo-Pacific Ocean during maxima following 1-2 y. This is associated with westerly wind anomalies at surface throughout equatorial troposphere in western/central paired...
The Mediterranean region is particularly sensitive to climate change as it located at the crossroads of atmospheric processes. In Mediterranean, and in it’s eastern parts, rate warming more pronounced than global mean warming, with projected increase up to  2.5-3.0 °C simultaneous decrease precipitation 15 % by end century.Here, we investigate contribution different drivers regional trends, focusing summer season. We are analyzing surface temperature trends...
The presence of aerosols in the stratosphere alters spectral shape, amount and spatial distribution solar light that reaches Earth surface. Such changes surface radiation have been discussed a few studies, but role underlying tropospheric aerosol layer stratospheric has not considered. In this study we investigate direct global irradiances following extremely intense volcanic eruption (VEI=6) Mount Pinatubo (15°N, 120°E) June 1991. ejected massive loads sulphate ash...
Abstract Forecasting volcanic ash atmospheric pathways is of utmost importance for aviation. Volcanic can interfere with aircraft navigational instruments and damage engine parts. Early warning systems, activated after eruptions alleviate the impacts on aviation by providing forecasts plume dispersion. The quality these short-term subject to accuracy meteorological wind fields used initialization regional models. Here, we use profiling data from first high spectral resolution lidar in space,...
Abstract It is debated whether the response of tropical Pacific Ocean to 11-yr solar cycle forcing resembles a La Niña– or El Niño–like signal. To address this issue, ensemble simulations employing an atmospheric general circulation model with and without ocean coupling are conducted. The coupled show no evidence for Niña–like cooling in maxima. Instead, sea surface temperature rises almost phase cycle. A basinwide warming about 0.1 K simulated Pacific, whereas Indian Atlantic Oceans weaker....
Abstract. This paper describes the solar forcing dataset for CMIP6 and highlights in particular changes with respect to CMIP5 recommendation. The is provided radiative properties, i.e., total irradiance (TSI) spectral (SSI), F10.7 cm radio flux, as well particle forcing, geomagnetic indices Ap Kp, ionisation rates account effects of protons, electrons galactic cosmic rays. first time that a recommendation solar-driven CMIP exercise. at daily monthly resolution separately Historical...
Ultraviolet-B (UV-B), UV-A, and erythemal solar irradiance over ocean-covered areas north of 55°N are simulated for the past (1950–1960), present (2005–2015), future (2090–2100) using a radiative transfer model. The simulations focus mainly on effects changes in ocean surface reflectivity, cloudiness, stratospheric ozone. Based projected sea ice cover thickness, transmitted into also derived. input parameters model were obtained from four Coupled Model Intercomparison Project phase 5 Earth...
Abstract Etesians are north to south direction winds in the lower atmosphere, blowing over Aegean basin from early summer autumn. They an important circulation component for East Mediterranean (EMED) area, linked subsidence and ascent EMED extended Indian monsoon region, respectively. In this study we investigate evolution of Etesian days associated wind speed (10 m) recent past (1979–2005) simulations Earth System Models (ESMs) available Coupled Model Intercomparison Project Phase 5....
There is growing evidence that variability associated with the 11-year solar cycle has an impact at Earth's surface and influences its weather climate. Although direct response to Sun's extremely small, a number of different mechanisms have been suggested could amplify signal, resulting in regional signals are much larger than expected. In this paper observed signal described, together proposed involve modulation via total incoming irradiance ultra-violet part spectrum ozone production stratosphere.
Observational data indicate a weakening and poleward shift of the subtropical tropospheric jets in maximum phase 11 year solar cycle, commonly explained terms direct “top‐down” propagation signals from stratosphere to troposphere. We here demonstrate possible linkages oceanic variability, instead. The observed response is qualitatively quantitatively reproduced an ensemble simulations with global model forced only at lower boundary by sea surface temperatures ice concentrations, while...
Abstract. The northerly Etesian winds are a stable summertime circulation system in the eastern Mediterranean, emerging from steep pressure gradient between central Europe and Balkans high-pressure Anatolian low-pressure systems. influenced by variability Indian summer monsoon (ISM), but their sensitivity to external forcing on interannual longer timescales is not well understood. Here, for first time, we investigate of large volcanic eruptions set model simulations over last millennium...
Abstract El Niño–Southern Oscillation (ENSO) and the Indian summer monsoon (ISM) are dominant modes of climate variability affecting tropical subtropical regions. In this study, we investigate impact ENSO episodes, through modulation ISM configuration, on Eastern Mediterranean (EMed) atmospheric circulation over whole 20th century using state art model simulations from 5th phase Climate Model Intercomparison Project (CMIP5). Results validated against European Centre for Medium‐Range Weather...
Abstract. The North Atlantic sector has been identified as a region where the 11-year solar cycle small but non-negligible impacts on near-surface climate. Nonetheless, debate persists about robustness of such and mechanisms that explain them. limited length historical records, together with complexity separating influence from other forcings internal variability explain, at least partially, discrepancies in published results. This work explores signatures 11-yr over 20th Century reanalysis...