0000000000308841

AUTHOR

Holger Siebert

showing 3 related works from this author

Collocated measurements of boundary layer cloud microphysical and radiative properties: A feasibility study

2010

[1] First data from collocated, helicopter-based measurements of boundary layer cloud microphysical properties (effective droplet radius Reff, droplet number concentration N) and spectral radiative quantities (cloud optical thickness τ, cloud top albedo ρ, reflectivity ) are presented. The in situ measurements of the microphysical cloud properties were collected by the Airborne Cloud Turbulence Observation System (ACTOS) attached to a helicopter by a 145 m long rope. Cloud spectral reflectivity was derived from radiances measured by grating spectrometers combined with downward looking optical inlets installed underneath the helicopter. Correlations between cloud microphysics and reflected r…

PhysicsAtmospheric ScienceEcologyMicrophysicsCloud topPaleontologySoil ScienceCloud physicsForestryAquatic ScienceAlbedoOceanographyGeophysicsAtmospheric radiative transfer codesSpectroradiometerSpace and Planetary ScienceGeochemistry and PetrologyEarth and Planetary Sciences (miscellaneous)RadianceRadiative transferEarth-Surface ProcessesWater Science and TechnologyRemote sensingJournal of Geophysical Research: Atmospheres
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General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI)-integrating aerosol research from nano …

2011

In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a rich legacy including: (a) a comprehensive database with a year of observations of the physical, chemical and optical properties of aerosol particles over Europe, (b) comprehensive aerosol measurements in four developing countries, (c) a database of airborne measurements of aerosols and clouds over Europe during May 2008, (d) comprehensive modeling tools to study aerosol processes fron nano to global scale and their effects on climate and air quality. In addition a new Pan…

Atmospheric ScienceEuropean aerosol010504 meteorology & atmospheric sciencesaerosolAerosol radiative forcingClimateclouds010501 environmental sciencesAtmospheric sciences01 natural scienceslcsh:Chemistry/dk/atira/pure/sustainabledevelopmentgoals/climate_actionAerosol cloud11. SustainabilitySDG 13 - Climate Actionddc:550particle propertiesEnvironmental policysaturation vapor-pressureschemical-transport modelMiljövetenskapair qualitylcsh:QC1-999General Circulation Model/dk/atira/pure/subjectarea/asjc/1900/1902EUCAARIEELS - Earth Environmental and Life SciencesION-INDUCED NUCLEATIONChemical transport modelMeteorologyEarth & EnvironmentEnergy / Geological Survey NetherlandsSIMULATION CHAMBER SAPHIRnuclei number concentrationSECONDARY ORGANIC AEROSOLpure component propertiesAir quality indexEnvironmental quality0105 earth and related environmental sciencesPARTICLE FORMATION EVENTSAtmosphärische Spurenstoffe[CHIM.CATA]Chemical Sciences/CatalysisCAS - Climate Air and Sustainability[SDE.ES]Environmental Sciences/Environmental and SocietyFalconAerosollcsh:QD1-99913. Climate actionmixed-phase cloudsEnvironmental scienceatmospheric sulfuric-acidEnvironmental Scienceslcsh:Physics
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The Arctic Cloud Puzzle: Using ACLOUD/PASCAL Multiplatform Observations to Unravel the Role of Clouds and Aerosol Particles in Arctic Amplification

2019

A consortium of polar scientists combined observational forces in a field campaign of unprecedented complexity to uncover the secrets of clouds and their role in Arctic amplification. Two research aircraft, an icebreaker research vessel, an ice-floe camp including an instrumented tethered balloon, and a permanent ground-based measurement station were employed in this endeavour. Clouds play an important role in Arctic amplification. This term represents the recently observed enhanced warming of the Arctic relative to the global increase of near-surface air temperature. However, there are still important knowledge gaps regarding the interplay between Arctic clouds and aerosol particles, surfa…

Atmospheric Science010504 meteorology & atmospheric sciencesbusiness.industryCloud computingPascal (programming language)010502 geochemistry & geophysics01 natural sciencesAerosolThe arcticEarth sciencesClimatologyddc:550Polar amplificationEnvironmental sciencebusinesscomputer0105 earth and related environmental sciencescomputer.programming_languageBulletin of the American Meteorological Society
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