A5001290943- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Indoor Air Quality and Microbial Exposure
- Icing and De-icing Technologies
- Air Quality and Health Impacts
- Aeolian processes and effects
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Air Quality Monitoring and Forecasting
- Microbial Community Ecology and Physiology
- Smart Materials for Construction
- Plant responses to elevated CO2
- Freezing and Crystallization Processes
- Lichen and fungal ecology
- Allergic Rhinitis and Sensitization
- Odor and Emission Control Technologies
- nanoparticles nucleation surface interactions
- Turfgrass Adaptation and Management
- Climate change and permafrost
- Climate Change Communication and Perception
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Meteorological Phenomena and Simulations
The Graduate University for Advanced Studies, SOKENDAI
2016-2025
National Institute of Polar Research
2016-2025
Research Organization of Information and Systems
2020
Colorado State University
2011-2015
Kanazawa University
2006-2011
Abstract. Data from both laboratory studies and atmospheric measurements are used to develop an empirical parameterization for the immersion freezing activity of natural mineral dust particles. Measurements made with Colorado State University (CSU) continuous flow diffusion chamber (CFDC) when processing aerosols at a nominal 105% relative humidity respect water (RHw) taken as measure nucleation Ice active frozen fractions vs. temperature dusts representative Saharan Asian desert sources...
Abstract. Bioaerosols are relevant for public health and may play an important role in the climate system, but their atmospheric abundance, properties, sources not well understood. Here we show that concentration of airborne biological particles a North American forest ecosystem increases significantly during rain bioparticles closely correlated with ice nuclei (IN). The greatest increase IN occurred size range 2–6 μm, which is characteristic bacterial aggregates fungal spores. By DNA...
Abstract. Soil organic matter (SOM) may be a significant source of atmospheric ice nucleating particles (INPs), especially those active > −15 °C. However, due to both lack investigations and the complexity SOM itself, identities these INPs remain unknown. To more comprehensively characterize we tested locally representative soils in Wyoming Colorado for total INPs, heat-labile fraction, (IN) bacteria, IN fungi, fulvic humic acids, plant tissue, nucleation by monolayers aliphatic alcohols....
Abstract Certain primary biological aerosol particles (PBAPs) are known to have very high ice nucleating ability under mixed‐phase cloud conditions. However, since the abundances of nucleation active PBAPs in atmosphere generally thought be extremely small, their importance has remained uncertain. Here we present evidence for role as atmospheric nuclei (IN) at temperatures ranging from about −34°C −9°C a midlatitude ponderosa pine forest ecosystem summertime. Our measurements show that...
Abstract. Heterogeneous ice nucleation is a crucial process for forming ice-containing clouds and subsequent ice-induced precipitation. The importance by airborne desert soil dusts composed predominantly of minerals widely acknowledged. However, the potential influence agricultural on has been poorly recognized, despite recent estimates that they may account up to 20–25% global atmospheric dust load. We have conducted freezing experiments with various dusts, including derived from largest...
Abstract. Kaolinite particles from two different sources (Fluka and Clay Minerals Society (CMS)) were examined with respect to their ability act as ice nuclei (IN). This was done in the water-subsaturated regime where often deposition nucleation is assumed occur, for water-supersaturated conditions, i.e., immersion freezing mode. Measurements using a flow tube (the Leipzig Aerosol Cloud Interaction Simulator, LACIS) continuous-flow diffusion chamber (CFDC). Pure coated used, coating...
Abstract It has long been known that precipitation can impact atmospheric aerosol, altering number concentrations and size‐dependent composition. Such effects result from competing mechanisms: remove particles through wet deposition, or lead to the emission of mechanical ejection, biological processes, re‐suspension associated wind gusts. These feed back into hydrologic cycle by serving as cloud nuclei. In this study, we investigated how at a forested site impacted concentration composition...
The chemical history of dust particles in the atmosphere is crucial for assessing their impact on both Earth's climate and ecosystem. So far, a number studies have shown that, vicinity strong anthropogenic emission sources, Ca-rich can be converted into aqueous droplets mainly by reaction with gaseous HNO(3) to form Ca(NO(3))(2). Here we show that other similar processes potential activated under typical remote marine atmospheric conditions. Based field measurements at several sites East...
Abstract. A number of new measurement methods for ice nucleating particles (INPs) have been introduced in recent years, and it is important to address how these compare. Laboratory comparisons instruments sampling major INP types are common, but few occurred ambient aerosol measurements exploring the utility, consistency complementarity different cover large dynamic range concentrations that exists atmosphere. In this study, we assess comparability four offline immersion freezing (Colorado...
Abstract. We present the laboratory results of immersion freezing efficiencies cellulose particles at supercooled temperature (T) conditions. Three types chemically homogeneous samples are used as surrogates that represent supermicron and submicron ice-nucleating plant structural polymers. These include microcrystalline (MCC), fibrous (FC) nanocrystalline (NCC). Our dataset includes data from various ice nucleation measurement techniques available 17 different institutions, including nine...
In order to study airborne bacterial community dynamics over Tokyo, including fine-scale correlations between microorganisms and meteorological conditions, the influence of local versus long-range transport microbes, air samples were collected on filters for periods ranging from 48 72 h. The diversity microbial was assessed by next generation sequencing. Predicted source regions particles, back trajectory analyses, changed abruptly Pacific Ocean Eurasian Continent in beginning October....
Abstract The Arctic is warming at more than twice the rate of global average. This influenced by clouds, which modulate solar and terrestrial radiative fluxes and, thus, determine surface energy budget. However, interactions among aerosols, in are still poorly understood. To address these uncertainties, Ny-Ålesund Aerosol Cloud Experiment (NASCENT) study was conducted from September 2019 to August 2020 Ny-Ålesund, Svalbard. campaign’s primary goal elucidate life cycle aerosols how they cloud...
Primary biological aerosol particles (PBAP) play an important role in the climate system, facilitating formation of ice within clouds, consequently PBAP may be understanding rapidly changing Arctic. Within this work, we use single-particle fluorescence spectroscopy to identify and quantify at Arctic mountain site, with transmission electronic microscopy analysis supporting presence PBAP. We find that concentrations range between 10-3-10-1 L-1 peak summer. Evidences suggest terrestrial...
Abstract. The Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics & Nitrogen (BEACHON) project seeks to understand the feedbacks and inter-relationships between hydrology, biogenic emissions, carbon assimilation, aerosol properties, clouds associated within water-limited ecosystems. Manitou Experimental Forest Observatory (MEFO) was established in 2008 by National Center for Atmospheric Research address many BEACHON research objectives, it now provides a...
Abstract Immersion freezing (ice nucleation by particles immersed in supercooled water) is a key process for forming ice mixed-phase clouds. experiments with microliter-sized (millimeter-sized) water droplets are often applied to detecting very small numbers of nucleating (INPs). However, the application such large remains confined detection INPs active at temperatures much higher than homogeneous limit, because artifacts related without added −25 °C or on supporting substrate. Here I report...
Heterogeneous ice nucleation in the atmosphere regulates cloud properties, such as phase (ice versus liquid) and lifetime. Aerosol particles of marine origin are relevant nucleating particle sources when aerosol layers lifted over mountainous terrain higher latitude ocean boundary layers, distant from terrestrial sources. Among many compositions associated with by sea spray aerosols highly saturated fatty acids. Previous studies have not demonstrated their ability to freeze dilute water...
Abstract Recent observations show that dust emitted within the Arctic (Arctic dust) has a remarkably high ice nucleating ability, especially between −20°C and −5°C, but its impacts on number concentrations of particles (INPs) radiative balance in are not well understood. Here we incorporate an observation‐based ice‐nucleation parameterization indicating ability into global aerosol‐climate model. A simulation using this better reproduces INP estimates >100 times higher with ∼100%...
The microbial communities transported by Asian desert dust (KOSA) events have attracted much attention as bioaerosols because the microorganisms are thought to influence downwind ecosystems in Korea and Japan. We analyzed bioaerosol samples collected at 10 800 m above ground within KOSA source area, Dunhuang City, China. were studied epifluorescent microscopy, revealing presence of bacterial cells attached mineral particles. able grow media containing up 20% NaCl, suggesting that bacteria...
Long-range transport of atmospheric microbiota with Asian dust (Kosa) particles is great concern in Northeast Asia view the health effect Kosa on human being, disturbance ecosystems caused through invasion new microbe, contribution microorganisms to biogeochemical cycle global/regional scales, and others. Information microbes over desert areas has been desired for a long time. Detection regions, base balloon-borne measurements, made at Dunhuang, China (40°00′ N, 94°30′ E; east end Taklamakan...
Changes in the ice nucleation properties of mineral dust particles due to soluble coatings are still not well understood. Here we show that reactivity with materials deposited on surfaces kaolinite is an important factor affecting particles. Using treated levoglucosan or H 2 SO 4 (i.e., non‐reactive and reactive materials, respectively), investigated fraction capable nucleating at temperatures ranging from −34°C −26°C. Below water saturation, both similarly reduced ability Above however,...
Abstract Ice nucleating particles (INPs) originating from Asia are expected to have large impacts on aerosol‐cloud‐precipitation interactions local, regional, and global scales. However, their seasonal variability is poorly understood. Here, we present a year‐round record of atmospheric INPs measured Tokyo Skytree, which the world's tallest broadcasting tower located in Metropolitan area. The INP number concentrations showed relatively small variations temperature regime below −20°C, whereas...