A5072086724- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Marine and coastal ecosystems
- Spectroscopy and Laser Applications
- Methane Hydrates and Related Phenomena
- Vehicle emissions and performance
- Ocean Acidification Effects and Responses
- Fire effects on ecosystems
- Arctic and Antarctic ice dynamics
- Oceanographic and Atmospheric Processes
- Laser-induced spectroscopy and plasma
- Arctic and Russian Policy Studies
- Advanced Chemical Physics Studies
- Hydrocarbon exploration and reservoir analysis
- Meteorological Phenomena and Simulations
- Coastal and Marine Management
- Fire dynamics and safety research
- Radioactive contamination and transfer
- Catalytic Processes in Materials Science
- Marine and fisheries research
- Precipitation Measurement and Analysis
Japan Agency for Marine-Earth Science and Technology
2016-2025
Kobe University
2019-2021
Nagoya University
2004-2007
Institute of Solar-Terrestrial Physics
2007
Niigata University
2003-2004
Abstract. Forest wildfires in interior Alaska represent an important black carbon (BC) source for the Arctic and sub-Arctic. However, BC observations have not been sufficient to constrain range of existing emissions. Here, we show our mass concentrations monoxide (CO) mixing ratios Poker Flat Research Range (65.12° N, 147.43° W), located central Alaska, from April 2016 December 2020. The medians, 10th percentile ranges, 90th ranges hourly concentration CO ratio throughout observation period...
Abstract. An observation-based box model approach was undertaken to estimate concentrations of OH, HO2, and RO2 radicals the net photochemical production rate ozone at top Mount Tai, located in middle Central East China, June 2006. The calculation constrained by measurements O3, H2O, CO, NO, NO2, hydrocarbon, HCHO, CH3CHO concentrations, temperature J values. estimated be 6.4 ppb h−1 as a 6-h average (09:00–15:00 CST), suggesting 58±37 is produced one day. Thus daytime buildup recorded...
Abstract. HO2 uptake coefficients for ambient aerosol particles, collected on quartz fiber filter using a high-volume air sampler in China, were measured an flow tube coupled with chemical conversion/laser-induced fluorescence technique at 760 Torr and 298 K, relative humidity of 75%. Aerosol particles regenerated atomizer the water extracts from particles. Over 10 samples, Mt. Tai site ranged 0.13 to 0.34, while those Mang range 0.09–0.40. These values are generally larger than previously...
Abstract. The coating of black carbon (BC) with inorganic salts and organic compounds can enhance the magnitude light absorption by BC. To elucidate enhancement aged BC particles its relation to mixing state morphology individual particles, we conducted observations at an Asian outflow site in Noto Peninsula, Japan, spring 2013. Absorption scattering coefficients 405, 532, 781 nm mass concentrations/mixing states refractory PM2.5 were measured using a three-wavelength photoacoustic soot...
Abstract. Long-term (2009–2015) observations of atmospheric black carbon (BC) mass concentrations were performed using a continuous soot-monitoring system (COSMOS) at Fukue Island, western Japan, to provide information on wet removal rate constraints and the emission strengths important source regions in East Asia (China others). The annual average concentration was 0.36 µg m−3, with distinct seasonality; high recorded during autumn, winter, spring caused by Asian continental outflows, which...
Abstract. A long-term, robust observational record of atmospheric black carbon (BC) concentrations at Fukue Island for 2009–2019 was produced by unifying the data from a continuous soot monitoring system (COSMOS) and Multi-Angle Absorption Photometer (MAAP). This then used to analyze emission trends China. We identified rapid reduction in BC (-5.8±1.5) % yr−1 or −48 2010 2018. concluded that an change (-5.3±0.7) yr−1, related changes China as much −4.6 main underlying driver. evaluation made...
Abstract Measurements of refractory black carbon (rBC) aerosol particles using a highly sensitive online single particle soot photometer were performed on board the R/V Mirai during cruise across Arctic Ocean, Bering Sea, and North Pacific Ocean (31 August to 9 October 2014). The measured rBC mass concentrations over in latitudinal region > 70°N range 0–66 ng/m 3 for 1 min averages, with an overall mean value 1.0 ± 1.2 . Single‐particle‐based observations enabled measurement such low...
Abstract. We implemented a tagged tracer method of black carbon (BC) into global chemistry transport model, GEOS-Chem, examined the pathways and efficiency long-range from variety anthropogenic biomass burning emission sources to Arctic, quantified source contributions individual emissions. Firstly, we evaluated simulated BC by comparing it with observations at Arctic sites sensitivity an aging parameterization wet scavenging rate ice clouds. For tagging BC, added tracers distinguished types...
Abstract. The emission characteristics of refractory black carbon (rBC) from biomass burning are essential information for numerical simulations regional pollution and climate effects. We conducted combustion experiments in the laboratory to investigate ratio mixing state rBC wheat straw rapeseed plants, which main crops cultivated Yangtze River Delta region China. A single particle soot photometer (SP2) was used measure rBC-containing particles at high temporal resolution with accuracy....
Abstract. While carbon dioxide is the main cause for global warming, modeling short-lived climate forcers (SLCFs) such as methane, ozone, and particles in Arctic allows us to simulate near-term health impacts a sensitive, pristine region that warming at 3 times rate. Atmospheric critical understanding long-range transport of pollutants Arctic, well abundance distribution SLCFs throughout atmosphere. Modeling also used tool determine SLCF on present future emissions scenarios. In this study,...
The HO2 uptake coefficient (γ) for inorganic submicrometer wet and dry aerosol particles ((NH4)2SO4 NaCl) under ambient conditions (760 Torr 296 ± 2 K) was measured using an flow tube (AFT) coupled with a chemical conversion/laser-induced fluorescence (CC/LIF) technique. CC/LIF technique enabled experiments to be performed at almost the same radical concentration as that in atmosphere. radicals were injected into AFT through vertically movable Pyrex tube. Injector position-dependent profiles...
Reducing uncertainties associated with measurements of black carbon (BC) particles is critical for improved quantification their impacts on climate and health. We compared BC using a continuous soot-monitoring system (COSMOS) multi-angle absorption photometer (MAAP) to assess uncertainties. found that by COSMOS MAAP instruments correlate strongly each other, hourly ratio showed minimal temporal variations, but the values were systematically higher factor 1.56 ± 0.19 (1σ), based simultaneous...
Abstract. We conducted an intensive field campaign at the summit of Mt. Tai (36.26° N, 117.11° E, 1534 m above sea level), Shandong Province, located center central East China, during period 28 May to 30 June 2006, study seasonal maxima regional air pollution with respect ozone (O3) and aerosols. The specific objectives, design, major findings are summarized. High concentrations O3 its precursors, aerosols, were detected studied in context annual variations. Most importantly, we identified...
The authors analyze the sensitivities of source regions in East Asia to PM2.5 (particulate matter with an aerodynamic diameter ≤2.5 µm) concentration at Fukue Island located western part Japan by using a regional chemical transport model emission sensitivity simulations for year 2010. temporal variations are generally reproduced, but absolute is underestimated model. Chemical composition compared filter sampling data spring; simulated sulfate, ammonium, and elemental carbon consistent...
Open crop residue burning is one of the major sources air pollutants including precursors photooxidants like ozone and secondary organic aerosol. We made measurements trace gases nonmethane volatile compounds (NMVOCs) in a rural area central East China June 2010. During campaign, we identified six biomass events total through simultaneous enhancement carbon monoxide acetonitrile. Four cases represented fresh plumes ( 3 h after emission), as determined by photochemical age. While were not...
Abstract We present results from the observation of fluorescent (FL) aerosols in Tokyo spring 2013. Ambient aerosol particles were analyzed using a single‐particle laser‐induced fluorescence instrument. The emission single particle excited by pulsed UV laser (excitation wavelength 263 nm) was detected three photomultiplier tubes with band‐pass filters (fluorescence 335–379, 420–500, and 500–600 nm). Fluorescence patterns for investigating fluorophores their sources backward trajectory...
Abstract. Ground-based measurements of black carbon (BC) were performed near an industrial source region in the early summer 2014 and at a remote island Japan spring 2015. Here, we report temporal variations transport, size distributions, mixing states BC-containing particles. These particles characterized using continuous soot monitoring system, single particle photometer, aerosol chemical speciation monitor. The effects aging on growth examined by comparing ground-based observations...
Abstract. Constraints from ozone (O3) observations over oceans are needed in addition to those terrestrial regions fully understand global tropospheric chemistry and its impact on the climate. Here, we provide a large data set of carbon monoxide (CO) levels observed (for 11 666 10 681 h, respectively) oceans. The is derived made during 24 research cruise legs R/V Mirai 2012 2017, Southern, Indian, Pacific, Arctic oceans, covering region 67∘ S 75∘ N. suitable for critical evaluation...
Marine aerosol feedback on biogeochemical cycles and the climate remains highly uncertain due to complex interplay. This review highlights recent advances in our understanding of organic aerosols, nitrogen, iron as well cloud properties over Pacific Ocean.
Abstract. We investigated the association of marine biological indicators (polysaccharides, protein-like gel particles, and chl a) with formation fluorescent aerosol cloud condensation nuclei (CCNs), ice-nucleating particles (INPs) over North Pacific Ocean, Bering Sea, Arctic Ocean during September–November 2019. The abundance bioindicators was high in Sea (e.g., up to 1.3 mg m−3 a), suggesting activity due a phytoplankton bloom. In were characterized by mass fractions organics sulfate...
We estimated the contributions of source regions in East Asia to PM2.5 mass concentrations over Japan for year 2010 using a regional chemical transport model with an emission sensitivity approach. The horizontal distributions and temporal variations were generally well reproduced by model. relative contribution China annual mean concentration was be 50–60% western (from Kyushu Kinki), 40% Kanto area. Central north (105°E–124°E, 34°N–42°N) made particularly significant contribution,...
Abstract. The Arctic environment is undergoing rapid changes such as faster warming than the global average and exceptional melting of glaciers in Greenland. Black carbon (BC) particles, which are a short-lived climate pollutant, one cause glacier melting. However, sources BC particles still uncertain. We simulated potential emission sensitivity atmospheric present over (north 66∘ N) using FLEXPART (FLEXible PARTicle) Lagrangian transport model (version 10.1). This version includes new...
Abstract The relationship between cloud phase, ice‐nucleating particles (INPs), and ocean state is vital in climate system modeling. High wave conditions induced by the Arctic sea‐ice decline intensified atmospheric forcing over ice‐free increase dynamical geochemical oceanic mixing sea spray supply containing organic substances, which could act as INPs promoting formation of lower tropospheric ice‐containing clouds. Here, we show that surface regulates INP concentration ice presence...