A5069737350- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atmospheric aerosols and clouds
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Meteorological Phenomena and Simulations
- Radiation Detection and Scintillator Technologies
- Climate variability and models
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Radiation Therapy and Dosimetry
- Seedling growth and survival studies
- Forest ecology and management
- Radioactive contamination and transfer
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- X-ray Spectroscopy and Fluorescence Analysis
Japan Meteorological Agency
2015-2024
Meteorological Research Institute
2015-2024
University of Exeter
2023
NILU
2023
University of Tsukuba
2022
Mitsubishi Research Institute (Japan)
2022
Kumamoto University
2022
Kyushu University
1960-2020
National Hospital Organization
2020
VTT Technical Research Centre of Finland
2016
Monthly CO 2 fluxes are estimated across 1988–2003 for 22 emission regions using data from 78 measurement sites. The same inversion (method, priors, data) is performed with 13 different atmospheric transport models, and the spread in results taken as a measure of model error. Interannual variability (IAV) winds not modeled, so any IAV measurements attributed to fluxes. When both this error random estimation errors considered, flux obtained statistically significant at P ≤ 0.05 when grouped...
Abstract. Atmospheric CO2 inversions estimate surface carbon fluxes from an optimal fit to atmospheric measurements, usually including prior constraints on the flux estimates. Eleven sets of estimates are compared, generated by different systems that vary in their methods, choice data, transport model and information. The were run for at least 5 yr period between 1990 2010. Mean 2001–2004, seasonal cycles, interannual variability trends compared tropics northern southern extra-tropics,...
The TransCom 3 experiment was begun to explore the estimation of carbon sources and sinks via inversion simulated tracer transport. We build upon previous work by presenting seasonal inverse results which provide estimates flux for 11 land ocean regions using 12 atmospheric transport models. monthly fluxes represent mean cycle 1992 1996 time period. spread among model is larger than average their estimated uncertainty in northern extratropics vice versa tropical regions. In regions, largest...
The ability to reliably estimate CO 2 fluxes from current in situ atmospheric measurements and future satellite is dependent on transport model performance at synoptic shorter timescales. TransCom continuous experiment was designed evaluate the of forward simulations hourly, daily, timescales, we focus latter two this paper. Twenty‐five models or variants submitted hourly time series nine predetermined tracers (seven for ) 280 locations. We extracted synoptic‐scale variability daily averaged...
Spatial and temporal variations of atmospheric CO2 concentrations contain information about surface sources sinks, which can be quantitatively interpreted through tracer transport inversion. Previous inversion calculations obtained differing results due to different data, methods models used. To isolate the uncertainty, we have conducted a set annual mean experiments in 17 or model variants were used calculate regional carbon sinks from same data with standardized method. Simulated is...
A forward atmospheric transport modeling experiment has been coordinated by the TransCom group to investigate synoptic and diurnal variations in CO 2 . Model simulations were run for biospheric, fossil, air‐sea exchange of SF 6 radon 2000–2003. Twenty‐five models or model variants participated comparison. Hourly concentration time series submitted 280 sites along with vertical profiles, fluxes, meteorological variables at 100 sites. The results have analyzed are compared observed 2002. Mean...
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...
Abstract Increasing atmospheric carbon dioxide (CO 2 ) is the principal driver of anthropogenic climate change. Asia an important region for global budget, with 4 world’s 10 largest national emitters CO . Using ensemble seven inverse systems, we estimated land biosphere fluxes (natural, land-use change and fires) based on observations concentration. The Asian was a net sink −0.46 (−0.70–0.24) PgC per year (median range) 1996–2012 mostly located in East Asia, while South Southeast close to...
The analyzing power AN in inclusive π− and π+ production has been measured with a 200 GeV/c transversely polarized antiproton beam over wide xF range (0.2≤xF≤0.9) at moderate pT (0.2≤pT≤1.5GeV/c). asymmetry increases increasing from zero to large positive values for π−'s, decreases negative π+'s. A threshold the onset of is observed about pT∼0.5GeV/c, below which essentially above (decreases) π−'s ( π+'s) covered range.Received 17 April...
Estimates of fossil fuel CO 2 are a critical component in atmospheric inversions. Rather than solving for this portion the budget, inversions typically include estimates as known quantity. However, assumption may not be appropriate, particularly continue to solve fluxes at reduced space and timescales. In study, two different alterations made widely used emissions estimates, these altered run through series inversion experiments. The first alteration is inclusion seasonal cycle which depends...
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 Robust estimates of CO 2 budget, exchanged between the atmosphere and terrestrial biosphere, are necessary to better understand role biosphere in mitigating anthropogenic emissions. Over past decade, this field research has advanced through understanding differences similarities two fundamentally different approaches: “top‐down” atmospheric inversions “bottom‐up” models. Since first studies were undertaken, these approaches have shown an increasing level agreement, but disagreements...
Abstract East Asia (China, Japan, Koreas, and Mongolia) has been the world's economic engine over at least past two decades, exhibiting a rapid increase in fossil fuel emissions of greenhouse gases (GHGs) expressed recent ambition to achieve climate neutrality by mid‐century. However, GHG balance its terrestrial ecosystems remains poorly constrained. Here, we present synthesis three most important long‐lived (CO 2 , CH 4 N O) budgets during decades 2000s 2010s, following dual constraint...
The goal of the DIRAC experiment at CERN (PS212) is to measure $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield precision 5% on value $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based part collected data we present first result lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss major systematic errors. This corresponds $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.
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. A new aerosol chemical transport model, the Regional Air Quality Model 2 (RAQM2), was developed to simulate Asian air quality. We implemented a simple version of triple-moment modal dynamics model (MADMS) and achieved completely dynamic (non-equilibrium) solution gas-to-particle mass transfer over wide range diameters from 1 nm super-μm. To consider variety atmospheric properties, category approach utilized in which aerosols were distributed into four categories: particles Aitken...
Abstract. Numerical simulation and validation of three-dimensional structure atmospheric carbon dioxide (CO2) is necessary for quantification transport model uncertainty its role on surface flux estimation by inverse modeling. Simulations CO2 were performed using four models two sets fluxes compared with an aircraft measurement dataset Comprehensive Observation Network Trace gases AIrLiner (CONTRAIL), covering various latitudes, longitudes, heights. Under this intercomparison project,...
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 Southeast Asia is a region known for active land‐use changes (LUC) over the past 60 years; yet, how trends in net CO 2 uptake and release resulting from LUC activities (net flux) have changed through decades remains uncertain. The level of uncertainty flux process‐based models so high that it cannot be concluded newer estimates are necessarily more reliable than older ones. Here, we examined 1980s−2010s sets Dynamic Global Vegetation Model simulations (TRENDY v2 v7, respectively),...