A5059350583- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Environmental and biological studies
- Air Quality Monitoring and Forecasting
- Geography and Environmental Studies
- Atmospheric and Environmental Gas Dynamics
- Aeolian processes and effects
- Indoor Air Quality and Microbial Exposure
- Vehicle emissions and performance
- Lichen and fungal ecology
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Biocrusts and Microbial Ecology
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Bryophyte Studies and Records
- Fire effects on ecosystems
- Particle Dynamics in Fluid Flows
- Species Distribution and Climate Change
- Climate Change Communication and Perception
- Climate variability and models
- Polar Research and Ecology
- Cyclone Separators and Fluid Dynamics
Max Planck Institute for Chemistry
2015-2025
Hessian Agency for Nature Conservation, Environment and Geology
2019-2025
Max Planck Institute for Biogeochemistry
2016-2020
University of Applied Sciences Mainz
2019
National Institute of Amazonian Research
2019
Leibniz Institute for Tropospheric Research
2008-2018
Leibniz Association
2012
Abstract. The Amazon Basin plays key roles in the carbon and water cycles, climate change, atmospheric chemistry, biodiversity. It has already been changed significantly by human activities, more pervasive change is expected to occur coming decades. therefore essential establish long-term measurement sites that provide a baseline record of present-day climatic, biogeochemical, conditions will be operated over decades monitor region, as perturbations increase future. Tall Tower Observatory...
Abstract. Size-resolved long-term measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations hygroscopicity were conducted at the remote Amazon Tall Tower Observatory (ATTO) in central Basin over a 1-year period full seasonal cycle (March 2014–February 2015). The provide climatology CCN properties characteristic Amazonian rain forest site.The continuously cycled through 10 levels supersaturation (S = 0.11 to 1.10 %) span particle size range from 20 245 nm. mean...
Abstract. The Chinese capital Beijing is one of the global megacities where effects rapid economic growth have led to complex air pollution problems that are not well understood. In this study, ambient particle number size distributions in between 2004 and 2006 analysed as a function regional meteorological transport. An essential result distribution depends large extent on history synoptic scale masses. A first approach based manual back trajectory classification yielded differences...
Abstract. Size-resolved measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations hygroscopicity were conducted over a full seasonal cycle at the remote Amazon Tall Tower Observatory (ATTO, March 2014–February 2015). In preceding companion paper, we presented annually seasonally averaged data parametrizations (Part 1; Pöhlker et al., 2016a). present study 2), analyze key features implications CCN properties for following characteristic conditions: Empirically...
Abstract. The Amazon rainforest is a sensitive ecosystem experiencing the combined pressures of progressing deforestation and climate change. Its atmospheric conditions oscillate between biogenic biomass burning (BB) dominated states. further represents one few remaining continental places where atmosphere approaches pristine during occasional wet season episodes. Tall Tower Observatory (ATTO) has been established in central Amazonia to investigate complex interactions atmosphere. Physical...
Abstract. In the Amazonian atmosphere, aerosol coarse mode comprises a complex, diverse, and variable mixture of bioaerosols emitted from rain forest ecosystem, long-range transported Saharan dust (we use Sahara as shorthand for source regions in Africa north Equator), marine aerosols Atlantic Ocean, smoke particles deforestation fires. For forest, are significance with respect to biogeochemical hydrological cycling, well ecology biogeography. However, knowledge on physicochemical biological...
Abstract. Black carbon (BC) aerosols influence the Earth's atmosphere and climate, but their microphysical properties, spatiotemporal distribution, long-range transport are not well constrained. This study presents airborne observations of transatlantic BC-rich African biomass burning (BB) smoke into Amazon Basin using a Single Particle Soot Photometer (SP2) as several complementary techniques. We base our results on trace gases off Brazilian coast onboard HALO (High Altitude LOng range)...
Abstract. Ice particle activation and evolution have important atmospheric implications for cloud formation, initiation of precipitation radiative interactions. The initial formation ice by heterogeneous nucleation requires the presence a nucleating seed, an ice-nucleating (INP), to facilitate its first emergence. Unfortunately, only few long-term measurements INPs exist, as result, knowledge about geographic seasonal variations INP concentrations is sparse. Here we present data from nearly...
Abstract. New particle formation (NPF), referring to the nucleation of molecular clusters and their subsequent growth into cloud condensation nuclei (CCN) size range, is a globally significant climate-relevant source atmospheric aerosols. Classical NPF exhibiting continuous from few nanometers Aitken mode around 60–70 nm widely observed in planetary boundary layer (PBL) world but not central Amazonia. Here, classical events are rarely within PBL, instead, begins upper troposphere (UT),...
Abstract Smoke from vegetation fires affects air quality, atmospheric cycling, and the climate in Amazon rain forest. A major unknown has remained quantity of long-range transported smoke Africa relation to local regional fire emissions. Here we quantify abundance, seasonality, properties African central Amazonia. We show that it accounts for ~ 60% black carbon concentrations during wet season 30% dry season. The influences aerosol-radiation interactions across entire Amazon, with strongest...
Abstract. Aerosol particle measurements in the atmospheric boundary layer performed by a helicopter-borne measurement payload and lidar system from case study during IMPACT field campaign Cabauw (NL) are presented. Layers of increased number concentrations ultrafine particles were observed residual layer, indicating relatively recent new-particle formation. These layers characterized sub-critical Richardson concomitant turbulence. Turbulent mixing is likely to lead local supersaturation...
Abstract. The CARRIBA (Cloud, Aerosol, Radiation and tuRbulence in the trade wInd regime over BArbados) project, focused on high resolution collocated measurements of thermodynamic, turbulent, microphysical, radiative properties wind cumuli Barbados, is introduced. project based two one-month field campaigns November 2010 (climatic wet season) April 2011 dry season). Observations are helicopter-borne ground-based an area 100 km2 off coast Barbados. accompanied by long-term observations at...
Abstract. This work presents a unique combination of aerosol, cloud microphysical, thermodynamic and turbulence variables to characterize supersaturation fluctuations in turbulent marine stratocumulus (SC) layer. The analysis is based on observations with the helicopter-borne measurement platform ACTOS detailed microphysical parcel model following three different approaches: (1) From comparison aerosol number size distributions inside below SC layer, activated particles calculated as 435±87...
Abstract. The intercontinental transport of aerosols from the Sahara desert plays a significant role in nutrient cycles Amazon rainforest, since it carries many types minerals to these otherwise low-fertility lands. Iron is one micronutrients essential for plant growth, and its long-range might be an important source iron-limited rainforest. This study assesses bioavailability iron Fe(II) Fe(III) particulate matter over forest, which was transported (for sake our discussion, this term also...
Abstract. The Amazon rain forest experiences the combined pressures from human-made deforestation and progressing climate change, causing severe potentially disruptive perturbations of ecosystem's integrity stability. To intensify research on critical aspects Amazonian biosphere–atmosphere exchange, Tall Tower Observatory (ATTO) has been established in central Basin. Here we present a multi-year analysis backward trajectories to derive an effective footprint region observatory, which spans...
Highly oxygenated molecules (HOMs) play an important role in the formation and evolution of secondary organic aerosols (SOA). However, abundance HOMs different environments their relation to oxidative potential fine particulate matter (PM) are largely unknown. Here, we investigated relative HOM radical yield laboratory-generated SOA PM ambient air ranging from remote forest areas highly polluted megacities. By electron paramagnetic resonance mass spectrometric investigations, found that...
Abstract. We use a global chemical transport model (GEOS-Chem) to interpret observed light-absorbing aerosols in Amazonia during the wet season. Observed aerosol properties, including black carbon (BC) concentration and light absorption, at Amazon Tall Tower Observatory (ATTO) site central have relatively low background levels but frequently show high peaks study period of January–April 2014. With daily temporal resolution for open fire emissions modified optical our successfully captures...
Abstract. The frequency and intensity of new particle formation (NPF) over remote forest regions in the temperate boreal zones, thus importance NPF for aerosol budget life cycle pristine atmosphere, remains controversial. Whereas has been shown to occur relatively frequently at several sites Scandinavia, it was found be nearly absent a mid-continental site Siberia. To explore this issue further, we made measurements size distributions between 10 420 nm diameter two transition region British...
Clear experimental evidence of the Twomey effect for shallow trade wind cumuli near Barbados is presented. Effective droplet radius ( r eff ) and cloud optical thickness τ ), retrieved from helicopter‐borne spectral cloud‐reflected radiance measurements, reflectivity γ λ are correlated with collocated in situ observations number concentration aerosol particles subcloud layer N ). denotes larger than 80 nm diameter represents activation mode. In microphysical parameters were sampled by...
Abstract. During the CARRIBA (Cloud, Aerosol, Radiation and tuRbulence in trade wInd regime over BArbados) campaign, interaction between aerosol particles cloud microphysical properties was investigated detail, which also includes influence of clouds on formation. two intensive campaigns 2010 2011, helicopter-borne measurement flights were performed to investigate thermodynamic, turbulent, microphysical, radiative trade-wind cumuli Barbados. these flights, 91 cases with increased particle...
Abstract. The marine aerosol arriving at Barbados (Ragged Point) was characterized during two 3-week long measurement periods in November 2010 and April 2011, the context of campaign CARRIBA (Cloud, Aerosol, Radiation tuRbulence trade wInd regime over BArbados). Through a comparison between ground-based airborne measurements it shown that former are representative boundary layer least up to cloud base. In general, total particle number concentrations (Ntotal) ranged from as low 100 800 cm−3,...
Abstract. Deriving absorption coefficients from Aethalometer attenuation data requires different corrections to compensate for artifacts related filter-loading effects, scattering by filter fibers, and aerosol particles. In this study, two correction schemes were applied seven-wavelength data, using multi-angle photometer (MAAP) as a reference measurement at 637 nm. The compensation algorithms compared five-wavelength offline measurements obtained with multi-wavelength absorbance analyzer...
Abstract. The tropical forests are Earth's largest source of biogenic volatile organic compounds (BVOCs) and thus also the atmospheric sink region for hydroxyl radical (OH). However, OH above is poorly understood, as past studies have revealed large unattributed fractions total reactivity. We present first reactivity compound (VOC) measurements made at Amazon Tall Tower Observatory (ATTO) 80, 150, 320 m ground level, covering two dry seasons, one wet season, transition season in 2018–2019....