44 hasil untuk "Athanasios Nenes"

Effects of Ocean Ecosystem on Marine Aerosol-Cloud Interaction

Nicholas Meskhidze; Athanasios Nenes

Advances in Meteorology, Vol. 2010 · 2010 · Inggris · DOAJ Scopus

Using satellite data for the surface ocean, aerosol optical depth (AOD), and cloud microphysical parameters, we show that statistically significant positive correlations exist between ocean ecosystem productivity, the abundance of submicron aerosols, and cloud microphysical properties over…

RaFSIP: Parameterizing Ice Multiplication in Models Using a Machine Learning Approach

Paraskevi Georgakaki; Athanasios Nenes

Journal of Advances in Modeling Earth Systems, Vol. 16 No. 6 · 2024 · Inggris · DOAJ Scopus

Abstract Accurately representing mixed‐phase clouds (MPCs) in global climate models (GCMs) is critical for capturing climate sensitivity and Arctic amplification. Secondary ice production (SIP), can significantly increase ice crystal number concentration (ICNC) in MPCs, affecting cloud properties…

ISORROPIA-Lite: A Comprehensive Atmospheric Aerosol Thermodynamics Module for Earth System Models

Stylianos Kakavas; Spyros N. Pandis; Athanasios Nenes

Tellus: Series B, Chemical and Physical Meteorology, Vol. 74 No. 1 · 2022 · Inggris · DOAJ Scopus

Aerosol simulations especially for Earth System Models require a thermodynamics module with a good compromise between rigor and computational efficiency. We present and evaluate ISORROPIA-lite, an accelerated and simplified version of the widely used ISORROPIA-II v.2.3 aerosol thermodynamics model…

Dimensionality Reduction and Network Inference for Climate Data Using δ‐MAPS: Application to the CESM Large Ensemble Sea Surface Temperature

Fabrizio Falasca; Annalisa Bracco; Athanasios Nenes dkk.

Journal of Advances in Modeling Earth Systems, Vol. 11 No. 6 · 2019 · Inggris · DOAJ Scopus

Abstract A framework for analyzing and benchmarking climate model outputs is built upon δ‐MAPS, a recently developed complex network analysis method. The framework allows for the possibility of highlighting quantifiable topological differences across data sets, capturing the magnitude of…

Determining the Role of Acidity, Fate and Formation of IEPOX-Derived SOA in CMAQ

Petros Vasilakos; Yongtao Hu; Armistead Russell dkk.

Atmosphere, Vol. 12 No. 6 · 2021 · Inggris · DOAJ Scopus

Formation of aerosol from biogenic hydrocarbons relies heavily on anthropogenic emissions since they control the availability of species such as sulfate and nitrate, and through them, aerosol acidity (pH). To elucidate the role that acidity and emissions play in regulating Secondary Organic Aerosol…

network-based constraint to evaluate climate sensitivity

Lucile Ricard; Fabrizio Falasca; Jakob Runge dkk.

Nature Communications, Vol. 15 No. 1 · 2024 · Inggris · DOAJ Scopus

Abstract The 2015 Paris agreement was established to limit Greenhouse gas (GHG) global warming below 1.5°C above preindustrial era values. Knowledge of climate sensitivity to GHG levels is central for formulating effective climate policies, yet its exact value is shroud in uncertainty. Climate…

A causal intercomparison framework unravels precipitation drivers in Global Storm-Resolving Models

Lucile Ricard; Tom Beucler; Claudia Christine Stephan dkk.

npj Climate and Atmospheric Science, Vol. 8 No. 1 · 2025 · Inggris · DOAJ Scopus

Abstract Correctly representing convective precipitation remains a long-standing problem in climate models, due to its highly parameterized nature and unclear role of drivers interacting over a wide range of spatial scales. We analyze and compare simulations of Global Storm-Resolving Models, namely…

Developing a UV climatology for public health purposes using satellite data

Laurent Vuilleumier; Todd Harris; Athanasios Nenes dkk.

Environment International, Vol. 146 · 2021 · Inggris · DOAJ Scopus

The effects of solar ultraviolet (UV) radiation on life on Earth differ greatly. While overexposure to UV rays is harmful, small amounts of exposure are necessary for the synthesis of Vitamin D and good health. To optimize individual exposure to solar UV, it is therefore crucial to use UV data…

Seasonal Aerosol Acidity, Liquid Water Content and Their Impact on Fine Urban Aerosol in SE Canada

Andrea M. Arangio; Pourya Shahpoury; Ewa Dabek-Zlotorzynska dkk.

Atmosphere, Vol. 13 No. 7 · 2022 · Inggris · DOAJ Scopus

This study explores the drivers of aerosol pH and their impact on the inorganic fraction and mass of aerosol in the S.E. Canadian urban environments of Hamilton and Toronto, Ontario. We find that inter-seasonal pH variability is mostly driven by temperature changes, which cause variations of up to…

Aerosol optical depth disaggregation: toward global aerosol vertical profiles

Shahine Bouabid; Duncan Watson-Parris; Sofija Stefanović dkk.

Environmental Data Science, Vol. 3 · 2024 · Inggris · DOAJ Scopus

Aerosol-cloud interactions constitute the largest source of uncertainty in assessments of anthropogenic climate change. This uncertainty arises in part from the difficulty in measuring the vertical distributions of aerosols, and only sporadic vertically resolved observations are available. We often…

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Satellite-Based Personal UV Dose Estimation

Todd C. Harris; Laurent Vuilleumier; Claudine Backes dkk.

Atmosphere, Vol. 12 No. 2 · 2021 · Inggris · DOAJ Scopus

Epidemiology and public health research relating to solar ultraviolet (UV) exposure usually relies on dosimetry to measure UV doses received by individuals. However, measurement errors affect each dosimetry measurement by unknown amounts, complicating the analysis of such measurements and their…

Impact of COVID-19 Lockdown on Oxidative Potential of Particulate Matter: Case of Athens (Greece)

Despina Paraskevopoulou; Aikaterini Bougiatioti; Pavlos Zarmpas dkk.

Toxics, Vol. 10 No. 6 · 2022 · Inggris · DOAJ Scopus

This work evaluates the aerosol oxidative potential (OP) and its changes from modified air pollution emissions during the COVID-19 lockdown period in 2020, with the intent of elucidating the contribution of aerosol sources and related components to aerosol OP. For this, daily particulate matter…

Towards reliable retrievals of cloud droplet number for non-precipitating planetary boundary layer clouds and their susceptibility to aerosol

Romanos Foskinis; Athanasios Nenes; Alexandros Papayannis dkk.

Frontiers in Remote Sensing, Vol. 3 · 2022 · Inggris · DOAJ Scopus

Remote sensing has been a key resource for developing extensive and detailed datasets for studying and constraining aerosol-cloud-climate interactions. However, aerosol-cloud collocation challenges, algorithm limitations, as well as difficulties in unraveling dynamic from aerosol-related effects on…

Corrigendum: Towards reliable retrievals of cloud droplet number for non-precipitating planetary boundary layer clouds and their susceptibility to aerosol

Romanos Foskinis; Athanasios Nenes; Alexandros Papayannis dkk.

Frontiers in Remote Sensing, Vol. 5 · 2024 · Inggris · DOAJ Scopus

CCN Properties of Organic Aerosol Collected Below and within Marine Stratocumulus Clouds near Monterey, California

Akua Asa-Awuku; Armin Sorooshian; Richard C. Flagan dkk.

Atmosphere, Vol. 6 No. 11 · 2015 · Inggris · DOAJ Scopus

The composition of aerosol from cloud droplets differs from that below cloud. Its implications for the Cloud Condensation Nuclei (CCN) activity are the focus of this study. Water-soluble organic matter from below cloud, and cloud droplet residuals off the coast of Monterey, California were…

Bioaerosols and dust are the dominant sources of organic P in atmospheric particles

Kalliopi Violaki; Athanasios Nenes; Maria Tsagkaraki dkk.

npj Climate and Atmospheric Science, Vol. 4 No. 1 · 2021 · Inggris · DOAJ Scopus

Abstract Several studies assessed the impact of inorganic P in fertilizing oligotrophic areas, however, the importance of organic P in such fertilization processes received far less attention. In this study, the amount and origin of organic P delivered to the eastern Mediterranean Sea were…

CCN Activity, Variability and Influence on Droplet Formation during the HygrA-Cd Campaign in Athens

Aikaterini Bougiatioti; Athina Argyrouli; Stavros Solomos dkk.

Atmosphere, Vol. 8 No. 6 · 2017 · Inggris · DOAJ Scopus

Measurements of cloud condensation nuclei (CCN) concentrations (cm−3) at five levels of supersaturation between 0.2–1%, together with remote sensing profiling and aerosol size distributions, were performed at an urban background site of Athens during the Hygroscopic Aerosols to Cloud Droplets…

Solid-state 31P NMR reveals the biological organophosphorus compounds as the dominant phosphorus species in Saharan dust aerosols

Kalliopi Violaki; Christos Panagiotopoulos; Claudia Esther Avalos dkk.

Communications Earth & Environment, Vol. 6 No. 1 · 2025 · Inggris · DOAJ Scopus

Abstract Phosphorus is a critical nutrient affecting primary productivity across all ecosystems. Many regions worldwide are limited or co-limited by phosphorus availability, which can be alleviated through atmospheric deposition. Dust is known to be a key external source of phosphorus in…

The influence of chemical composition, aerosol acidity, and metal dissolution on the oxidative potential of fine particulate matter and redox potential of the lung lining fluid

Pourya Shahpoury; Zheng Wei Zhang; Andrea Arangio dkk.

Environment International, Vol. 148 · 2021 · Inggris · DOAJ Scopus

Air pollution is a major environmental health risk and it contributes to respiratory and cardiovascular diseases and excess mortality worldwide. The adverse health effects have been associated with the inhalation of fine particulate matter (PM2.5) and induction of respiratory oxidative stress. In…