A5089677748- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Atmospheric Ozone and Climate
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Freezing and Crystallization Processes
- Atmospheric and Environmental Gas Dynamics
- Icing and De-icing Technologies
- Coastal and Marine Dynamics
- Climate change and permafrost
- nanoparticles nucleation surface interactions
- Metabolomics and Mass Spectrometry Studies
- Arctic and Russian Policy Studies
- Coastal and Marine Management
- Marine animal studies overview
- Polar Research and Ecology
- Marine Bivalve and Aquaculture Studies
- Advanced Scientific Research Methods
- Mercury impact and mitigation studies
- Analytical chemistry methods development
- Marine and coastal plant biology
- Marine and Coastal Research
Leibniz Institute for Tropospheric Research
2018-2025
University of Bremen
2023
Abstract Clouds play an important role in Arctic amplification. This term represents the recently observed enhanced warming of relative to global increase near-surface air temperature. However, there are still knowledge gaps regarding interplay between clouds and aerosol particles, surface properties, as well turbulent radiative fluxes that inhibit accurate model simulations climate system. In attempt resolve this so-called cloud puzzle, two comprehensive closely coordinated field studies...
Abstract. The project MarParCloud (Marine biological production, organic aerosol Particles and marine Clouds: a process chain) aims to improve our understanding of the genesis, modification impact matter (OM) from its export particles and, finally, ability act as ice-nucleating (INPs) cloud condensation nuclei (CCN). A field campaign at Cape Verde Atmospheric Observatory (CVAO) in tropics September–October 2017 formed core this that was jointly performed with MARSU (MARine atmospheric...
Abstract. In a warming Arctic the increased occurrence of new particle formation (NPF) is believed to originate from declining ice coverage during summertime. Understanding physico-chemical properties newly formed particles, as well mechanisms that control both and growth in this pristine environment, important for interpreting aerosol–cloud interactions, which climate can be highly sensitive. investigation, we present analysis NPF high summer Arctic. The measurements were made on-board...
Abstract. Ice-nucleating particles (INPs) initiate the primary ice formation in clouds at temperatures above ca. −38 ∘C and have an impact on precipitation formation, cloud optical properties, persistence. Despite their roles both weather climate, INPs are not well characterized, especially remote regions such as Arctic. We present results from a ship-based campaign to European Arctic during May July 2017. deployed filter sampler continuous-flow diffusion chamber for offline online INP...
Sea spray aerosol (SSA) formation plays a major role in the climate system. The Antarctic Peninsula (AP) is affected by greatest warming occurring Southern Ocean; changes cryospheric and biological processes are being observed. Whilst there some evidence that organic material produced ice algae and/or phytoplankton high Arctic contributes to SSA, less known about (sympagic) regions. To gain insight into influence of biology biogeochemistry on atmospheric aerosol, we report simultaneous...
Recent studies pointed to a high ice nucleating activity (INA) in the Arctic sea surface microlayer (SML). However, related chemical information is still sparse. In present study, INA and free glucose concentrations were quantified SML bulk water samples from marginal zone, ice-free ocean, melt ponds, open waters within pack. T50 (defining INA) ranged −17.4 −26.8 °C. Glucose varied 0.6 51 μg/L with highest values zone ponds (median 16.3 13.5 μg/L) lower pack ocean 3.9 4.0 μg/L). Enrichment...
We present ship-borne and land-based measurements of carbohydrate concentrations patterns in (i) bulk seawater, (ii) sea surface microlayer (SML), (iii) atmospheric size-resolved aerosol particles (0.05–10 μm) collected the Western Antarctic Peninsula. In we find higher combined carbohydrates (CCHO) both particulate (PCCHO, 13–248 μg L–1) dissolved (DCCHO, 14–294 phases than free (DFCHO, 1.0–17 L–1). Moderate enrichment factors are found SML samples (median EFSML = 1.4 for PCCHO, DCCHO,...
Abstract. Transparent exopolymer particles (TEPs) exhibit the properties of gels and are ubiquitously found in world oceans. TEPs may enter atmosphere as part sea-spray aerosol. Here, we report number concentrations with a diameter > 4.5 µm, hence covering supermicron particle range, ambient aerosol cloud water samples from tropical Atlantic Ocean well generated using plunging waterfall tank that was filled seawater. The TEP ranged between 7×102 3×104 #TEP m−3 correlations sodium (Na+)...
Remote marine regions are characterized by a high degree of cloud cover that greatly impacts Earth's radiative budget. It is highly relevant for climate projections to represent the ice formation in these clouds. Therefore, it crucial understand sources ice-nucleating particles (INPs) enable primary formation. Here, we report polysaccharides produced four different aquatic eukaryotic microorganisms (Thraustochytrium striatum, Tausonia pullulans, Naganishia diffluens, Penicillium chrysogenum)...
Carbohydrates, amino acids, and lipids are significant contributors to organic carbon in the marine environment, playing key roles ocean-atmosphere interactions. To investigate their sea-to-air transfer, enrichment sea surface microlayer (SML), potential transformations during atmospheric transport, we conducted field studies tropical Atlantic Ocean at Cape Verde Atmospheric Observatory. This study links measurements of these compounds seawater, including SML, with presence composition...
Black carbon (BC) is a key contributor to modifications in the radiation budget of snow-covered surfaces. By reducing snow albedo, BC accelerates melting and triggers feedback processes between atmosphere cryosphere. Its primary sources are anthropogenic, including incomplete combustion diesel engines, biomass burning, agricultural activities.Despite its significance, data on concentrations central Arctic remain sparse, with most studies focusing continental regions or spring summer seasons....
Primary marine organic aerosol (PMOA) is a significant contributor to concentrations in remote oceanic regions, influencing aerosol-cloud-climate interactions. In the Arctic, sea ice retreat and summer loss are key drivers of potential increases emissions. This study uses an extended version aerosol-climate model ECHAM6.3-HAM2.3 investigate emission patterns trends primary Arctic from 1990 2019 large detail, considering changing climate conditions. Using offline results biogeochemistry...
Ice formation processes influence the radiative properties, precipitation and consequently cloud life time in these mixed-phase clouds. Primary ice is enabled by so-called nucleating particles (INPs). In remote marine regions such as Southern Ocean, where INP concentrations are naturally low (McCluskey et al., 2018; Tatzelt 2022), discrepancies to atmospheric observations representation of phase with strong biases effects were identified models (Vergara-Temprado 2018). To improve models, a...
Abstract. This study examines carbohydrates, amino acids, and lipids as important contributors to organic carbon (OC) in the tropical Atlantic Ocean at Cape Verde Atmospheric Observatory (CVAO). The above compounds were measured both surface seawater ambient sub-micron aerosol particles investigate their sea-to-air transfer, including enrichment sea microlayer (SML), potential atmospheric situ formation or degradation, oceanic contribution marine particles. In bulk SML, similar distributions...
Abstract. Field measurements were conducted to determine aerosol chemical composition at a newly established remote high-altitude site in North Africa the Atlas Mohammed V (AMV) atmospheric observatory located Middle Mountains. The main objectives of present work are investigate variations and better assess global regional changes Africa. A total 200 particulate matter (PM10) filter samples collected using high-volume (HV) collector 12 h sampling interval from August December 2017. was...
Abstract. An optimized method is presented to determine dissolved free (DFCHO) and combined carbohydrates (DCCHO) in saline matrices, such as oceanic seawater, Arctic ice core samples or brine using a combination of desalination with electro-dialysis (ED) high-performance anion exchange chromatography coupled pulsed amperometric detection (HPAEC-PAD). Free neutral sugars, glucose galactose, were found 95 %–98 % recovery rates. amino sugars uronic acids strongly depleted during ED at pH=8,...
In the Arctic, new particle formation (NPF) and subsequent growth processes are keys to produce Aitken-mode particles, which under certain conditions can act as cloud condensation nuclei (CCNs). The activation of particles increases CCN budget Arctic low-level clouds and, accordingly, affects climate forcing. However, mechanism from NPF into range in summertime boundary layer remains a subject current research. this combined cruise field modeling study, we investigated sizes above 80 nm. A...
Within the Southern Ocean, greatest warming is occurring on Antarctic Peninsula (AP) where clear cryospheric and biological consequences are being observed. coastal systems harbour a high diversity of marine terrestrial ecosystems heavily influenced by seaweeds (benthonic macroalgae) bird colonies (mainly penguins). Primary sea spray aerosols (SSA) formed outburst bubbles via sea-surface microlayer depend organic composition water surface. In order to gain insight into influence ocean...
Abstract. Carbohydrates, originating from marine microorganisms, enter the atmosphere as part of sea spray aerosol (SSA) and can influence fog cloud microphysics condensation nuclei (CCN) or ice-nucleating particles (INP). Particularly in remote Arctic region, significant knowledge gaps persist about sources, sea-to-air transfer mechanisms, atmospheric concentrations, processing this substantial organic group. In ship-based field study conducted May to July 2017 Fram Strait, Barents Sea,...
Abstract Novel observations of aerosol and clouds by means ground-based remote sensing have been performed in Antarctica over the Ekström Ice Shelf on coast Dronning Maud Land at Neumayer Station III (70.67°S, 8.27°W) from January to December 2023. The deployment OCEANET-Atmosphere observatory framework Continuous Observations Aerosol-Cloud Interaction (COALA) campaign has brought Aerosol, Clouds Trace Gases Research Infrastructure (ACTRIS) cloud profiling capabilities next meteorological...
Abstract. The project MarParCloud (Marine biological production, organic aerosol Particles and marine Clouds: a process chain) aims at improving our understanding of the genesis, modification impact matter (OM), from its via export to particles and, finally, towards ability act as ice nucleating (INP) cloud condensation nuclei (CCN). A field campaign Cape Verde Atmospheric Observatory (CVAO) in tropics September/October 2017 formed core this that was jointly performed with (MARine...
Abstract. In a warming Arctic the increased occurrence of new particle formation (NPF) is believed to originate from declining ice coverage during summertime. Understanding physico-chemical properties newly formed particles, as well mechanisms that control both and growth in this pristine environment important for interpreting aerosol-cloud interactions, which climate can be highly sensitive. investigation, we present analysis NPF high summer Arctic. The measurements have been done on-board...
Novel ground-based remote sensing observations of aerosols and clouds have been carried out in Antarctica at the German Neumayer Station III (70.67°S, 8.27°W) for a whole year. The deployment mobile exploratory platform OCEANET-Atmosphere brought full ACTRIS aerosol cloud profiling capabilities next to meteorological, radiation, air chemistry in-situ Antarctic station. is currently only station on floating ice shelf that manned throughout year, providing excellent...
Carbohydrates, amino acids, and lipids are important contributors to organic carbon (OC) in the marine environment. To study their sea-to-air transfer, including enrichment sea surface microlayer (SML), potential atmospheric situ formation or degradation, oceanic contribution ambient aerosol particles, we provide measurements from tropical Atlantic Ocean at Cape Verde Atmospheric Observatory (CVAO) where above compounds were investigated both seawater submicron particles. In bulk SML,...
As a pristine region, the Antarctic peninsula can be model for preindustrial atmospheric environment and, accordingly, give insights in processes related to climate change. Most studies performed this region focus on either aerosol sources, example ocean, or chemical composition of particles. Wind and wave driven physical mechanisms particle mobilization (e.g. bubble bursting) lead formation sea-spray particles (SSA) consisting sea salt together with primary organic (POA), which is rich...