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View article: Amazônia doesn’t forget: Tropical trees with drought memory resist El Niño
Amazônia doesn’t forget: Tropical trees with drought memory resist El Niño Open
Amazônia is the largest tropical rainforest in the world storing between 150-200 petagrams of carbon in its vegetation and soils, and it contributes significantly to the stability of the Earth’s climate system. However, there is…
View article: Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region
Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region Open
During the ACRIDICON-CHUVA field project (September–October 2014; based in Manaus, Brazil) aircraft-based in situ measurements of aerosol chemical composition were conducted in the tropical troposphere over the Amazon using the High Altitu…
View article: Ice particle sampling from aircraft – influence of the probing position on the ice water content
Ice particle sampling from aircraft – influence of the probing position on the ice water content Open
The ice water content (IWC) of cirrus clouds is an essential parameter determining their radiative properties and thus is important for climate simulations. Therefore, for a reliable measurement of IWC on board research aircraft, it is imp…
View article: Aircraft-based observations of isoprene epoxydiol-derivedsecondary organic aerosol (IEPOX-SOA) in the tropical uppertroposphere over the Amazon region
Aircraft-based observations of isoprene epoxydiol-derivedsecondary organic aerosol (IEPOX-SOA) in the tropical uppertroposphere over the Amazon region Open
During the ACRIDICON-CHUVA field project (September–October 2014; based in Manaus, Brazil) aircraft-based in-situ measurements of aerosol chemical composition were conducted in the tropical troposphere over the Amazon using the High Altitu…
View article: Mixed-phase and ice cloud observations with NIXE-CAPS
Mixed-phase and ice cloud observations with NIXE-CAPS Open
Clouds are a main component in the climate system. They influence the energy balance ofthe atmosphere by changing the earth’s albedo and greenhouse effect, and redistribute energyby releasing and consuming latent heat in cloud particle nuc…
View article: Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin
Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin Open
Airborne observations over the Amazon Basin showed high aerosol particle concentrations in the upper troposphere (UT) between 8 and 15 km altitude, with number densities (normalized to standard temperature and pressure) often exceeding tho…
View article: Illustration of microphysical processes in Amazonian deep convective clouds in the gamma phase space: introduction and potential applications
Illustration of microphysical processes in Amazonian deep convective clouds in the gamma phase space: introduction and potential applications Open
The behavior of tropical clouds remains a major open scientific question, resulting in poor representation by models. One challenge is to realistically reproduce cloud droplet size distributions (DSDs) and their evolution over time and spa…
View article: Ice particle sampling from aircraft – influence of the probing position on the ice water content
Ice particle sampling from aircraft – influence of the probing position on the ice water content Open
The ice water content (IWC) of cirrus clouds is an essential parameter determining their radiative properties and thus is important for climate simulations. Therefore, for a reliable measurement of IWC on board of research aircraft, it is …
View article: Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime
Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime Open
The degree of glaciation of mixed-phase clouds constitutes one of the largest uncertainties in climate prediction. In order to better understand cloud glaciation, cloud spectrometer observations are presented in this paper, which were made…
View article: Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin
Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin Open
Airborne observations over the Amazon Basin showed high aerosol particle concentrations in the upper troposphere (UT) between 8 and 15 km altitude, with number densities (normalized to standard temperature and pressure) often exceeding tho…
View article: Supplementary material to "Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin"
Supplementary material to "Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin" Open
Figure S1: Example of a back-tracked parcel starting at the location of the HALO aircraft during flight AC18.This parcel started at 2014-09-28 20:34:53 UTC and was traced back in time in onehour steps up to 120 hours, as shown in the time …
View article: Vertical distribution of the particle phase in tropical deep convective clouds as derived from cloud-side reflected solar radiation measurements
Vertical distribution of the particle phase in tropical deep convective clouds as derived from cloud-side reflected solar radiation measurements Open
Vertical profiles of cloud particle phase in tropical deep convective clouds (DCCs) were investigated using airborne solar spectral radiation data collected by the German High Altitude and Long Range Research Aircraft (HALO) during the ACR…
View article: Classification of Arctic, Mid-Latitude and Tropical Clouds in the Mixed-Phase Temperature Regime
Classification of Arctic, Mid-Latitude and Tropical Clouds in the Mixed-Phase Temperature Regime Open
The degree of glaciation of mixed-phase clouds constitutes one of the largest uncertainties in climate prediction. In order to better understand cloud glaciation, cloud spectrometer observations are presented in this paper that were made i…
View article: Illustration of microphysical processes in Amazonian deep convective clouds in the Gamma phase space: Introduction and potential applications
Illustration of microphysical processes in Amazonian deep convective clouds in the Gamma phase space: Introduction and potential applications Open
The behavior of tropical clouds remains a major open scientific question, given that the associated phys-ics is not well represented by models. One challenge is to realistically reproduce cloud droplet size dis-tributions (DSD) and their e…
View article: Vertical distribution of the phase state of particles in tropical deep-convective clouds as derived from cloud-side reflected solar radiation measurements
Vertical distribution of the phase state of particles in tropical deep-convective clouds as derived from cloud-side reflected solar radiation measurements Open
Vertical profiles of the cloud particle phase state in tropical deep-convective clouds (DCCs) were investigated using airborne solar radiation data collected by the German research aircraft HALO during the ACRIDICON-CHUVA campaign, which w…
View article: Thermodynamic correction of particle concentrations measured by underwingprobes on fast-flying aircraft
Thermodynamic correction of particle concentrations measured by underwingprobes on fast-flying aircraft Open
Particle concentration measurements with underwing probes on aircraft are impacted by air compression upstream of the instrument body as a function of flight velocity. In particular, for fast-flying aircraft the necessity arises to account…
View article: ML-CIRRUS: The Airborne Experiment on Natural Cirrus and Contrail Cirrus with the High-Altitude Long-Range Research Aircraft HALO
ML-CIRRUS: The Airborne Experiment on Natural Cirrus and Contrail Cirrus with the High-Altitude Long-Range Research Aircraft HALO Open
The Midlatitude Cirrus experiment (ML-CIRRUS) deployed the High Altitude and Long Range Research Aircraft (HALO) to obtain new insights into nucleation, life cycle, and climate impact of natural cirrus and aircraft-induced contrail cirrus.…
View article: Quasi-Spherical Ice in Convective Clouds
Quasi-Spherical Ice in Convective Clouds Open
Homogeneous freezing of supercooled droplets occurs in convective systems in low and midlatitudes. This droplet-freezing process leads to the formation of a large amount of small ice particles, so-called frozen droplets, that are transport…
View article: The origin of midlatitude ice clouds and the resulting influence on their microphysical properties
The origin of midlatitude ice clouds and the resulting influence on their microphysical properties Open
The radiative role of ice clouds in the atmosphere is known to be important, but uncertainties remain concerning the magnitude and net effects. However, through measurements of the microphysical properties of cirrus clouds, we can better c…
View article: A microphysics guide to cirrus clouds – Part 1: Cirrus types
A microphysics guide to cirrus clouds – Part 1: Cirrus types Open
The microphysical and radiative properties of cirrus clouds continue to be beyond understanding and thus still represent one of the largest uncertainties in the prediction of the Earth's climate (IPCC, 2013). Our study aims to provide a gu…
View article: ACRIDICON–CHUVA Campaign: Studying Tropical Deep Convective Clouds and Precipitation over Amazonia Using the New German Research Aircraft HALO
ACRIDICON–CHUVA Campaign: Studying Tropical Deep Convective Clouds and Precipitation over Amazonia Using the New German Research Aircraft HALO Open
Between 1 September and 4 October 2014, a combined airborne and ground-based measurement campaign was conducted to study tropical deep convective clouds over the Brazilian Amazon rain forest. The new German research aircraft, High Altitude…