A5029790017- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Plant responses to elevated CO2
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Soil and Water Nutrient Dynamics
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Groundwater and Isotope Geochemistry
- Odor and Emission Control Technologies
- Marine and coastal ecosystems
- Agriculture, Soil, Plant Science
- Air Quality Monitoring and Forecasting
- Aeolian processes and effects
- Hydrology and Watershed Management Studies
- Fire effects on ecosystems
- Radioactive contamination and transfer
- Soil Carbon and Nitrogen Dynamics
- Forest ecology and management
- Peatlands and Wetlands Ecology
- Oil Spill Detection and Mitigation
- Boron and Carbon Nanomaterials Research
- Water Resources and Management
- Radioactivity and Radon Measurements
Tokyo University of Agriculture and Technology
2015-2024
Meisei University
2006-2012
Kanagawa Environmental Research Center
2006
Asia Center for Air Pollution Research
1999-2005
Tokyo University of Science
1995-1998
Tokai University
1994
Mitsubishi Corporation (United States)
1978
Water-soluble organic nitrogen (WSON) affects the formation, chemical transformations, hygroscopicity, and acidity of aerosols as well biogeochemical cycles nitrogen. However, large uncertainties exist in origins formation processes WSON. Submicrometer aerosol particles were collected at a suburban forest site Tokyo summer 2015 to investigate relative impacts anthropogenic biogenic sources on WSON formations their linkages with liquid water (ALW). The concentrations (ave. 225 ± 100 ngN m–3)...
A size‐segregated aerosol model that includes most of the major physical processes (generation, transport, and dry wet deposition) is developed. This coupled with a Regional Air Quality Model (RAQM) applied to simulate Asian dust storms during 10‐day period 15–24 March 2002. nonhydrostatic mesoscale (MM5) used provide meteorological fields. results are verified by available observational data including surface weather observations particle concentrations. The validation demonstrates good...
Atmospheric emissions of reactive nitrogen have increased significantly on a global scale due to increases the use artificial fertilizer and burning fossil fuels. The Asian region has been identified as high-risk area for deposition effects ecosystems. This paper describes measurement-based assessment carried out in cooperation with Acid Deposition Monitoring Network East Asia (EANET). investigation aimed understand status variability dry, wet total oxidized reduced over 10-year period...
The impact of biogenic emission on regional ozone and control scenarios has been numerically studied through a series sensitivity model simulations. A typical episode with elevated over eastern China from 12 to 16 August 2001 was investigated by using tropospheric chemistry transport (TCTM), driven non-hydrostatic mesoscale MM5. meteorological conditions during this period were characterized high-pressure systems associated low wind speeds, high temperatures clear skies. Afternoon...
Since July 2000 the activity of Miyakejima volcano has become brisk. Sulfur emitted from flowed into Japanese Archipelago and brought high‐concentration episodes SO 2 over a wide area. The daily average emission during period August to March 2001 was same level as recent originating fossil fuel combustion in east Asia. Estimated total (wet plus dry) deposition sulfur at Tanzawa before eruption for most remarkable almost Japan. after eruption, on other hand, more than three times higher...
Particulate matter deposited on leaf surfaces may cause erosion/abrasion of epicuticular wax and the malfunction stomata. However, deposition processes particulate matter, such as elemental carbon (EC), has not been studied sufficiently in Asian forest ecosystems. Deposition for <TEX>${SO_4}^{2-}$</TEX> EC were a Japanese cedar Kajikawa, Niigata Prefecture, Japan, dry evergreen deciduous Sakaerat, Nakhon Ratchasima province, Thailand. The fluxes attributed to rainfall outside canopy (RF),...
East Asian oceans are possibly affected by a high nitrogen (N) burden because of the intense anthropogenic emissions in this region. Based on high-resolution regional chemical transport modeling with horizontal grid scales 36 and 12 km, we investigated N into via atmospheric deposition 2010. We found 2–9 kg ha−1 yr−1 over Yellow Sea, China Sea (ECS), Japan. Emissions Asia were dominated ammonia (NH3) land oxides (NOx) oceans, was reduced most open ocean, whereas it oxidized marginal seas...
The impact of biogenic emission on regional ozone and control scenarios has been numerically studied through a series sensitivity model simulations. A typical episode with elevated over eastern China from 12 to 16 August 2001 was investigated by using tropospheric chemistry transport (TCTM), driven non-hydrostatic mesoscale MM5. meteorological conditions during this period were characterized high-pressure systems associated low wind speeds, high temperatures clear skies. Afternoon...
Excess inputs of reactive nitrogen (Nr) from the atmosphere will cause disturbances to forest ecosystems, including soil and stream water acidification, plant nutrient imbalances, alterations species compositions (such as biodiversity losses), (N) leaching into water. Central Japan (or Chubu region) has experienced both domestic transboundary air pollution since 1950s. Emissions oxides in China peaked 2011/2012, although peak ammonia emissions not been confirmed. Changes these have reflected...