A5107329364- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Marine and coastal ecosystems
- Atmospheric aerosols and clouds
- Odor and Emission Control Technologies
- Climate variability and models
- Heavy metals in environment
- Meteorological Phenomena and Simulations
- Mercury impact and mitigation studies
- Air Quality Monitoring and Forecasting
- Isotope Analysis in Ecology
- Groundwater and Isotope Geochemistry
- Analytical chemistry methods development
- Radioactive contamination and transfer
- Vehicle emissions and performance
- Geophysics and Gravity Measurements
- Hydrocarbon exploration and reservoir analysis
- Arctic and Antarctic ice dynamics
- Spectroscopy and Laser Applications
- Radioactivity and Radon Measurements
- Ocean Acidification Effects and Responses
- Indoor Air Quality and Microbial Exposure
- Climate change and permafrost
National Institute for Environmental Studies
2015-2025
Japan Meteorological Agency
2022
Tokyo Institute of Technology
2011
NILU
2010
National Institute of Advanced Industrial Science and Technology
2010
Sulfur and lead isotope ratios in the atmosphere were measured at several selected sites (Harbin, Changchun, Dalian, Waliguan, Shanghai, Nanjing, Guiyang) China Tsukuba (Japan), to reveal regional sources characteristics over Eastern Asia. Average S for SO2 sulfate close those of coals used each region, indicating a considerable contribution coal combustion sulfur compounds atmosphere. Most northern cities had around 5% ratio, while Guiyang, southwestern city China, showed considerably lower...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of sources lead in the urban air Asia using ratios stable isotopesHitoshi Mukai, Naoki Furuta, Toshihiro Fujii, Yoshinari Ambe, Kazuhiko Sakamoto, and Yoshikazu HashimotoCite this: Environ. Sci. Technol. 1993, 27, 7, 1347–1356Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July...
Abstract. Accurate national scale greenhouse gas source and sink estimates are essential to track climate mitigation efforts. Inverse models can complement inventory-based approaches for emissions reporting by providing independent underpinned atmospheric measurements, yet few nations have developed this capability carbon dioxide (CO2). We present results from a decade-long (2011–2020) inverse modelling study New Zealand, which suggests persistent in Zealand’s terrestrial biosphere (-171 ±...
The use of airborne lead isotope ratios as tracers long‐range transport air pollutants in the Asian region was evaluated using trajectory analysis. Airborne particulate matter collected various seasons from 1988 to 1991 at Oki Islands located between continent and Japan. Air masses coming Japan had nearly equal those measured on mainland less radiogenic than Trajectory analysis showed that these values could be used further subdivide having come one three regions: southern part Korean...
Abstract. Time series of the atmospheric O2∕N2 ratio and CO2 mole fraction flask samples obtained from National Institute for Environmental Studies' (NIES's) sampling network are presented. The includes two ground sites, Hateruma island (HAT; 24.05∘ N, 123.81∘ E) Cape Ochiishi (COI; 43.17∘ 145.50∘ E), cargo ships regularly sailing in western Pacific. Based on temporal changes fossil-fuel-derived emissions, global burden potential oxygen (APO), which were calculated observed according to APO...
Measurements of surface ozone were conducted at three remote island sites in the East Asian Pacific rim region during Exploratory Mission‐West (A) campaign period September–October, 1991. The concentrations observed measurement stations Oki and Okinawa, Japan, Kenting, Taiwan, had similar ranges varying between 6–63, 8–58, 4–65 ppb, respectively, except for one event short‐range transport polluted air Kenting. Day‐to‐day variations have been analyzed by using backward parcel trajectories on...
Abstract Methane is a substantial contributor to climate change. It also contributes maintaining the background levels of tropospheric ozone. Among variety CH 4 sources, current estimates suggest that emissions from oil and gas processes account for approximately 20% worldwide anthropogenic emissions. Here, we report on observational evidence offshore platforms in Southeast Asia, detected by highly time-resolved spectroscopic monitoring technique deployed onboard cargo ships opportunity. We...
We observed prominent CO enhancements with simultaneous of CO2 and CH4 around the Malay Peninsula in South-East Asia from mid-June to mid-August 2013 based on systematic shipboard observations. identified 18 episodes enhancement during period, which were responsible for largest positive anomaly areas off eastern coast Peninsular Malaysia Straits Malacca between 2007 Satellite data revealed that resulted mainly emissions large-scale biomass burning north-central Sumatra. characterized five...
Abstract The COVID-19 pandemic caused drastic reductions in carbon dioxide (CO 2 ) emissions, but due to its large atmospheric reservoir and long lifetime, no detectable signal has been observed the CO growth rate. Using variabilities (ΔCO methane (ΔCH 4 at Hateruma Island, Japan during 1997–2020, we show a traceable emission reduction China February–March 2020. monitoring station Island observes outflow of Chinese emissions winter spring. A systematic increase ΔCO /ΔCH ratio, governed by...
Measurements of NO, NO y , CO, and O 3 were conducted at Oki Island, 65 km west the Japanese mainland during September–October 1991. The results show that Island site is relatively clean with mean (and median) CO concentrations 137 (130) ppbv 713 (505) pptv, respectively. These low reflect frequent occurrence windsfrom less populated regions to north this campaign. During several periods, elevated associated transport pollutants from Japan Korea. are significantly correlated in entire data...
We present measurements of atmospheri CO2/N2 and CO2 mixing ratios taken at Hateruma Island (HAT) Cape Ochi-Ishi (COI) in Japan. Global carbon sinks are estimated from the tracer atmospheric potential oxygen (APO) calculated as weighted sums observed O2/N2 CO2, global data NOAA/ESRL GMD flask sampling network. The oceanic land biotic 2.4 ± 0.7 0.5 0.9 Pg C yr-1, respectively, for 7-yr period (July 1998–July 2005) 2.1 1.0 6-yr 1999–July 2005). former estimates based on HAT only, while latter...
It has been suggested that the emissions of volatile organic compounds (VOCs) from ocean could be affected by global warming, with feedback effects on climate. In order to detect changes in their as a response environmental change, long‐term observations are required. Here we report for first time variations atmospheric methyl iodide (CH 3 I), most abundant iodine‐containing compound predominantly emitted ocean. We monitored its concentration periodically at five remote sites covering...
Abstract. Emissions of greenhouse gases (GHGs) from the Indian subcontinent have increased during last 20 years along with rapid economic growth; however, there remains a paucity GHG measurements for policy-relevant research. In northern India and Bangladesh, agricultural activities are considered to play an important role in concentrations atmosphere. We performed weekly air sampling at Nainital (NTL) Comilla (CLA) Bangladesh 2006 2012, respectively. Air samples were analyzed dry-air gas...
Aerial measurement of atmospheric pollutants was carried out over the East China Sea on 20, 21, and 22 March 2001. High concentrations not only gaseous species (maximum SO 2 > 10 ppb O 3 100 in marine boundary layer) but also particulate matter (PM) (average concentration PM 2.5 ∼ 30 μg m −3 1000 were observed 21March. Such high at low altitude. A cold front passing Korean Peninsula extension a high‐pressure system from central to responsible for transport pollutants. confined lower...
The atmospheric mixing ratios of perfluorocarbons (PFCs), extremely potent greenhouse gases, have been continuously measured at two Japanese stations (Cape Ochiishi and Hateruma Island) since 2006, to infer their global regional emissions. baseline the C2−C4 PFCs [PFC-116 (C2F6), PFC-218 (C3F8), PFC-318 (c-C4F8)] showed slight annual increases 1%−3%. Enhanced above were occasionally observed both sites in air masses that had passed over metropolitan regions East Asia, suggesting high PFC...
We present a data set of atmospheric potential oxygen (APO = O 2 + 1.1 × CO ) based on the /N and measurements flask samples collected at two monitoring stations in Japan commercial cargo ships sailing between U.S./Canada Australia/New Zealand. Since APO is invariant with respect to terrestrial biotic exchange, its variation mainly reflects spatiotemporal distribution air‐to‐sea gas exchange. From observed for years 2002–2008, we find: (1) elevated annual mean values near equator, (2) large...
We conducted a soil warming experiment in cool-temperate forested peatland northern Japan during the snow-free seasons of 2007–2011, to determine whether would change heterotrophic respiration rate and its temperature sensitivity. elevated by 3°C at 5-cm depth using overhead infrared heaters continuously measured hourly CO2 fluxes with 15-channel automated chamber system. The 15 chambers were divided into three groups each five replications for control, unwarmed-trenched warmed-trenched...
The carbon sink over land plays a key role in the mitigation of climate change by removing dioxide (CO2) from atmosphere. Accurately assessing capacity across regions should contribute to better future projections and help guide global emissions towards Paris Agreement. This study estimates terrestrial CO2 fluxes India using high-resolution inverse model that assimilates surface observations observation network Indian subcontinent, airborne sampling Brazil, data Greenhouse gas Observing...