A5076338080- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Atmospheric aerosols and clouds
- Advanced Chemical Sensor Technologies
- Spectroscopy and Laser Applications
- Marine and coastal ecosystems
- Mass Spectrometry Techniques and Applications
- Odor and Emission Control Technologies
- Catalytic Processes in Materials Science
- Ocean Acidification Effects and Responses
- Analytical Chemistry and Chromatography
- Fire effects on ecosystems
- Water Quality Monitoring and Analysis
- Climate variability and models
- Algebraic Geometry and Number Theory
- COVID-19 impact on air quality
- Indoor Air Quality and Microbial Exposure
- Commutative Algebra and Its Applications
- Rings, Modules, and Algebras
- Meteorological Phenomena and Simulations
- Algebraic structures and combinatorial models
National Institute for Environmental Studies
2016-2025
Kobe University
2022-2024
Tokyo University of Marine Science and Technology
2023
Nagoya University
1983-2022
Ishikawa Prefectural University
2015
Ehime University
2013
The University of Tokyo
1999-2009
Hokkaido University
2009
Max Planck Institute for Chemistry
2009
University of Wollongong
2009
The Tropospheric Ozone Assessment Report (TOAR) is an activity of the International Global Atmospheric Chemistry Project. This paper a component report, focusing on present-day distribution and trends tropospheric ozone relevant to climate global atmospheric chemistry model evaluation. Utilizing TOAR surface database, several figures present daytime average at 2702 non-urban monitoring sites, highlighting regions seasons world with greatest levels. Similarly, ozonesonde commercial aircraft...
In support of the first Tropospheric Ozone Assessment Report (TOAR) a relational database global surface ozone observations has been developed and populated with hourly measurement data enhanced metadata. A comprehensive suite products including standard statistics, health vegetation impact metrics, trend information, are made available through common portal web interface. These form basis TOAR analyses focusing on human health, vegetation, climate relevant issues, which part this special...
This article introduces an international regional experiment, East Asian Regional Experiment 2005 (EAREX 2005), carried out in March–April the east region, as one of first phase experiments under UNEP Atmospheric Brown Cloud (ABC) project, and discusses some outstanding features aerosol characteristics its direct radiative forcing with comparison results obtained another ABC early Maldives Monsoon (APMEX) conducted south region. Time series optical thickness (AOT), single scattering albedo...
Abstract. Changes in baseline (here understood as representative of continental to hemispheric scales) tropospheric O3 concentrations that have occurred at northern mid-latitudes over the past six decades are quantified from available measurement records with goal providing benchmarks which retrospective model calculations global distribution can be compared. Eleven data sets (ten ground-based and one airborne) including European (beginning 1950's before), three North American 1984) two...
Abstract Two recent papers have quantified long‐term ozone (O 3 ) changes observed at northern midlatitude sites that are believed to represent baseline (here understood as representative of continental hemispheric scales) conditions. Three chemistry‐climate models (NCAR CAM‐chem, GFDL‐CM3, and GISS‐E2‐R) calculated retrospective tropospheric O concentrations part the Atmospheric Chemistry Climate Model Intercomparison Project Coupled Phase 5 model intercomparisons. We present an approach...
Abstract. The Community Earth System Model (CESM1) CAM4-chem has been used to perform the Chemistry Climate Initiative (CCMI) reference and sensitivity simulations. In this model, Atmospheric version 4 (CAM4) is fully coupled tropospheric stratospheric chemistry. Details specifics of each configuration, including new developments improvements are described. CESM1 a low-top model that reaches up approximately 40 km uses horizontal resolution 1.9° latitude 2.5° longitude. For specified...
Evidence indicates that the densely cultivated region of northeastern China acts as a source for wind-borne agent Kawasaki disease (KD). KD is an acute, coronary artery vasculitis young children, and still medical mystery after more than 40 y. We used residence times from simulations with flexible particle dispersion model to pinpoint KD. Simulations were generated locations spanning Japan days either high or low incidence. The postepidemic interval (1987-2010) extreme epidemics (1979, 1982,...
During the summer of 2003, biomass fires burned a large area Siberia, largest in at least 10 years. We used NRL Aerosol Analysis and Prediction System (NAAPS) model to forecast transport smoke from these fires. Transport airmasses North America was confirmed by aircraft surface observations. The resulted enhancements background CO O 3 23–37 5–9 ppbv, respectively, sites Alaska, Canada Pacific Northwest. From burned, we estimate that Siberian generated 68 Tg 0.82 NO x (as N). In addition,...
We used laser‐induced fluorescence to measure the concentrations of OH and HO 2 radicals in central Tokyo during two intensive campaigns (IMPACT IV IMPACT L) January–February July–August 2004. The estimated detection limit for 10‐min data was 1.3 × 10 5 cm −3 nighttime 5.2 daytime. median values daytime peak were 1.1 5.7 pptv winter summer periods, respectively, while 1.5 6 6.3 . High mixing ratios (>50 pptv) observed on a day when O 3 exceeded 100 ppbv. average 0.7 2.6 1.8 3.7 A...
The Chemical Weather Forecast System (CFORS) is designed to aid in the design of field experiments and interpretation/postanalysis observed data. system integrates a regional chemical transport model with multitracer, online built within Regional Atmospheric Modeling (RAMS) mesoscale model. CFORS was deployed forecast postanalysis modes during NASA Global Tropospheric Experiment (GTE)‐Transport Evolution over Pacific (TRACE‐P), International Chemistry project (IGAC)‐International...
Abstract. Organic tracer compounds, as well organic carbon (OC), elemental (EC), water-soluble (WSOC), and stable isotope ratios (δ13C) of total (TC) have been investigated in aerosol samples collected during early late periods the Mount Tai eXperiment 2006 (MTX2006) field campaign North China Plain. Total solvent-extractable fractions were by gas chromatography/mass spectrometry. More than 130 compounds detected samples. They grouped into twelve compound classes, including biomass burning...
Laboratory studies of atmospheric chemistry characterize the nature atmospherically relevant processes down to molecular level, providing fundamental information used assess how human activities drive environmental phenomena such as climate change, urban air pollution, ecosystem health, indoor quality, and stratospheric ozone depletion. have a central role in addressing incomplete knowledge chemistry. This article highlights evolving science needs for this community emphasizes our is far...
Abstract. Formaldehyde (HCHO), the most abundant carbonyl compound in atmosphere, is generated as an intermediate product oxidation of nonmethane hydrocarbons. Proton transfer reaction mass spectrometry (PTR-MS) has capability to detect HCHO from ion signals at m/z 31 with high time-resolution. However, detection sensitivity low compared other detectable species, and considerably affected by humidity, due back reactions between protonated water vapor prior analysis. We performed a laboratory...
The Arctic is a sentinel of global change. This region influenced by multiple physical and socio-economic drivers feedbacks, impacting both the natural human environment. Air pollution one such driver that impacts climate change, ecosystems health but significant uncertainties still surround quantification these effects. air includes harmful trace gases (e.g. tropospheric ozone) particles black carbon, sulphate) toxic substances polycyclic aromatic hydrocarbons) can be transported to from...
At northern midlatitudes the abundance of tropospheric O 3 has increased by a factor approximately 2 since 1950s. The cause this increase is generally attributed to increasing anthropogenic precursor emissions, but present chemical and transport models cannot quantitatively reproduce its magnitude. Here we show another manifestation changes in abundance—a shift seasonal cycle at so that observed peak concentrations now appear earlier year than previous decades. rate been 6 days per decade...
Abstract. In situ observation of the atmospheric CO2, CH4, and CO mixing ratios at Hateruma Island (HAT, 24.05° N, 123.80° E) often show synoptic-scale variations with correlative elevations during winter, associated air transport from East Asian countries. We examine winter (November– March) trends in ΔCH4 / ΔCO2, ΔCO observed over period 1999 to 2010. To investigate relationship between emissions short-term ratios, we use FLEXPART Lagrangian particle dispersion model (LPDM). The ΔCO2 both...
Abstract. In this study, an extension on the previously reported status of COllaborative Carbon Column Observing Network's (COCCON) calibration procedures incorporating refined methods is presented. COCCON a global network portable Bruker EM27/SUN FTIR spectrometers for deriving column-averaged atmospheric abundances greenhouse gases. The original laboratory open-path lamp measurements instrumental line shape (ILS) spectrometer from water vapour lines have been and extended to secondary...
Abstract. Carbon monoxide total column amounts in the atmosphere have been measured High Northern Hemisphere (30°-90° N, HNH) between January 2002 and December 2003 using infrared spectrometers of high moderate resolution Sun as a light source. They were compared to ground-level CO mixing ratios from space by Terra/MOPITT instrument. All these data reveal increased abundances 2002-2003 comparison unperturbed 2000-2001 period. Maximum anomalies observed September August 2003. Using simple...
High frequency monitoring of hydrofluorocarbons (HFCs) and some other halocarbons in the atmosphere has been performed at Hateruma Island (lat. 24.1°N, long. 123.8°E), a background site east Asia. The observed concentrations showed occasional short‐term enhancement events over hours to days as well clear seasonal variation, being lower summer than seasons. We found that HFC‐23 enhancements were closely related air transport from China. Using tagged simulation three‐dimensional model...
Abstract. A challenge for the quantitative analysis of tropospheric nitrogen dioxide (NO2) column data from satellite observations is posed partly by lack satellite-independent validation. We performed such NO2 using ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) technique in North China Plain (NCP) 29 May to June, 2006. Comparisons between columns measured MAX-DOAS and Ozone Monitoring Instrument (OMI) onboard Aura indicate that OMI (the standard product,...
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...