A5076709272- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Aeolian processes and effects
- Meteorological Phenomena and Simulations
- Vehicle emissions and performance
- Climate variability and models
- Marine and coastal ecosystems
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Geochemistry and Geologic Mapping
- Environmental Impact and Sustainability
- Environmental Policies and Emissions
- Calibration and Measurement Techniques
- Geology and Paleoclimatology Research
- COVID-19 impact on air quality
- Climate Change Policy and Economics
- Conservation Techniques and Studies
- Arctic and Antarctic ice dynamics
- Grey System Theory Applications
- Wind Energy Research and Development
- Marine Biology and Ecology Research
Kyushu University
2010-2024
Meteorological Research Institute
2011-2020
Japan Meteorological Agency
2011-2020
Harvard University
2011
Abstract Himawari‐8, a next‐generation geostationary meteorological satellite, was launched on 7 October 2014 and became operational July 2015. The advanced imager board Himawari‐8 is equipped with 16 observational bands (including three visible near‐infrared bands) that enable retrieval of full‐disk aerosol optical properties at 10 min intervals from (GEO) orbit. Here we show the first application (AOPs) derived data to assimilation. Validation assimilation experiment by comparison...
Since the first International Cooperative for Aerosol Prediction (ICAP) multi-model ensemble (MME) study, number of ICAP global operational aerosol models has increased from five to nine. An update current status is provided, along with an evaluation performance ICAP-MME over 2012-2017, a focus on June 2016-May 2017. Evaluated ground-based Robotic Network (AERONET) optical depth (AOD) and data assimilation quality MODerate-resolution Imaging Spectroradiometer (MODIS) retrieval products, AOD...
Abstract. We introduce a Multi-mOdel Multi-cOnstituent Chemical data assimilation (MOMO-Chem) framework that directly accounts for model error in transport and chemistry, we integrate portfolio of analyses obtained using multiple forward chemical models state-of-the-art ensemble Kalman filter system. The simultaneously optimizes both concentrations emissions species through ingestion suite measurements (ozone, NO2, CO, HNO3) from satellite sensors. In spite substantial differences, the...
We present detailed 3D structure of Asian dust outflow from a source region to the northwestern Pacific ocean retrieved by NASA/CALIOP onboard CALIPSO and results simulated four‐dimensional variational (4DVAR) data assimilation version transport model (RC4) based on NIES Lidar network. The modeled CALIOP extinction showed good agreement, both for horizontal scale (600–1200 km) vertical depth (1600–3600 m) near regions. Cross‐section analyses RC4 assisted forward trajectory revealed that Gobi...
Abstract. Detailed 3-D structures of Trans-Pacific Asian dust transport occurring during 5–15 May 2007 were investigated using the NASA/CALIOP vertical-resolved measurements and a three-dimensional aerosol model (SPRINTARS). Both CALIOP SPRINTARS extinctions showed good agreement along way from source regions across North Pacific into America. A vertically two-layered distribution was observed over northeastern The lower layer originated storm generated in Gobi Desert on 5 May. It...
Abstract. The NASA space-borne Mie-lidar system CALIPSO/CALIOP revealed that multiple large Asian dust layers with a horizontal scale of 2000–3000 km reached North America, occupying the full troposphere, in April 2010. This kind layer transport has not been reported before. Our analysis CALIOP data and global aerosol model results frequent emissions occurred northwestern China because stronger-than-average near-surface winds, strong stable westerly winds carried from to central Pacific...
Abstract. A global aerosol reanalysis product named the Japanese Reanalysis for Aerosol (JRAero) was constructed by Meteorological Research Institute (MRI) of Japan Agency. The employs a transport model developed MRI and two-dimensional variational data assimilation method. It assimilates maps optical depth (AOD) from MODIS onboard Terra Aqua satellites every 6 h has TL159 horizontal resolution (approximately 1.1° × 1.1°). This paper describes model, system, observation data, setup examines...
Abstract. Acidifying species in precipitation can have severe impacts on ecosystems. The chemical composition of is directly related to the amount precipitation; accordingly, it difficult identify long-term variation concentrations. ratio nitrate (NO3−) non-sea-salt sulfate (nss-SO42−) concentration an equivalent basis (hereinafter, Ratio) a useful index investigate relative contributions these acidifying species. To record over East Asia, region with highest emissions worldwide, we compiled...
A rapid decrease in PM2.5 concentrations China has been observed response to the enactment of strong emission control policies. From 2012 2017, total emissions SO2 and NOx from decreased by approximately 63% 24%, respectively. Simultaneously, decreases concentration Japan have since 2014, proportion stations that satisfy environmental standard (daily, 35 µg/m3; annual average, 15 µg/m3) increased 37.8% fiscal year (FY) 2014 (April March 2015) 89.9% FY 2017. However, quantitative relationship...
A four‐dimensional variational (4DVAR) data assimilation system was developed for a regional dust model. This report presents results of the first adjoint inversion Asian emissions over East Asia using NIES LIDAR observations, targeting extreme phenomenon on 30 April 2005. Optimized mitigated underestimation concentrations and brought structure elevated layer (both onset timing extinction coefficient intensity) into better agreement with observations. We obtained 31% (3.2 Tg) increase...
Observations of tropospheric aerosols (mineral dust, air-pollution aerosols, etc.) and clouds are being conducted using a network two-wavelength (1064nm, 532nm) polarization (532nm) lidars in the East Asian region. Currently, operated continuously at 23 locations Japan, Korea, China, Mongolia Thailand. A real-time data processing system was developed for network, products such as attenuated backscatter coefficients estimated extinction non-spherical spherical generated automatically online...
Abstract. Anthropogenic SO2 emissions increased alongside economic development in China at a rate of 12.7% yr−1 from 2000 to 2005. However, under new Chinese government policy, declined by 3.9% between 2005 and 2009. Between 2010, we found that the variability fine-mode (submicron) aerosol optical depth (AOD) over oceans adjacent East Asia 3–8% peak around 2005–2006 subsequently decreased 2–7% yr−1, based on observations Moderate Resolution Imaging Spectroradiometer (MODIS) board NASA's...
[1] Summertime phytoplankton blooms in the oligotrophic North Pacific Ocean are supported by N2-fixing organisms that relieve system of nitrate limitation. Phosphate and iron, however, limit their growth need to be supplied for these thrive. We analyze two recent region whose differences provide insight into possible formation mechanisms. In 2008, a typical late summer bloom, with sporadic patches higher-chlorophyll concentration, occurred near island chain subtropical front. 2010, an...
Abstract Inverse modeling of Asian dust over the 8 year period 2005–2012 was performed with Spectral Radiation‐Transport Model for Aerosol Species/four‐dimensional variational (SPRINTARS/4D‐Var) data assimilation system and satellite‐measured aerosol optical thickness ocean. We validated inversion results independent measurements provided by ground‐based space‐based lidar various in situ measurements. The were used to analyze interannual variations fluxes relationships these climate indices....
We verified an algorithm using multi-wavelength Mie-Raman lidar (MMRL) observations to retrieve four aerosol components (black carbon (BC), sea salt (SS), air pollution (AP), and mineral dust (DS)) with in-situ measurements, determined the seasonal variation of in Fukuoka, western region Japan. PM2.5, PM10, mass concentrations BC SS are derived from measurements. MMRL provides extinction coefficient (α), particle linear depolarization ratio (δ), backscatter (β), (S) at 355 532 nm, attenuated...
Abstract Bottom-up emission inventories can provide valuable information for understanding status and are needed as input datasets to drive chemical transport models. However, this type of inventory has the disadvantage taking several years be compiled because it relies on a statistical dataset. Top-down approaches use satellite data constraint overcome disadvantage. We have developed an immediate inversion system estimate anthropogenic NO x emissions with 2 column density constrained by...
Abstract. The emergence of aerosol reanalyses in recent years has facilitated a comprehensive and systematic evaluation optical depth (AOD) trends attribution over multi-decadal timescales. Notable multi-year currently available include NAAPS-RA from the US Naval Research Laboratory, NASA MERRA-2, JRAero Japan Meteorological Agency (JMA), CAMSRA Copernicus/ECMWF. These are based on differing underlying meteorology models, representations processes, as well data assimilation methods treatment...
Abstract. Three-dimensional structures of Asian dust transport in the planetary boundary layer (PBL) and free atmosphere occurring successively during end May 2007 were clarified using results space-borne backscatter lidar, Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), obtained a data-assimilated version model (RC4) based on ground-based NIES lidar network. The depths vertical horizontal structure simulated by RC4 agreed those CALIOP observations from source region to...
The model performance of a regional-scale meteorology-chemistry (NHM-Chem) has been evaluated for the consistent predictions chemical, physical, and optical properties aerosols. These are essentially important accurate assessment air quality health hazards, contamination land ocean ecosystems, regional climate changes due to aerosol-cloud-radiation interaction processes. Currently, three optional methods available: five-category non-equilibrium method, three-category bulk equilibrium method....
Abstract. Simultaneous ground-based measurements of ozone (O3) and carbon monoxide (CO) were conducted in March 2005 as part the East Asian Regional Experiment (EAREX) under umbrella Atmospheric Brown Clouds (ABC) project. Multiple air quality monitoring networks integrated by performing intercomparison individual calibration standards measurement techniques to ensure comparability ambient measurements, along with providing consistently high time-resolution O3 CO at surface sites Asia....