Atmospheric Composition Research Team

Introduction

We welcome post-doctoral researchers from Japan or from overseas especially on
(1) field measurements or laboratory studies (heterogeneous chemistry) of OH and HO2 radicals
(2) MAX-DOAS network measurements in east Asia and Russia.

Please contact us for more information. Application for JSPS postdoctral fellowship (see the site) is encouraged.

Address

Frontier Research Bldg, 2F, JAMSTEC Yokohama campus,
3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, JAPAN

Aim

Air quality in East Asia has been affected by rapid development in the region. Ozone and aerosol particles can have serious impact on human health and biosphere. Their influence on the climate/weather is also important, because tropospheric ozone and black carbon induce heating and other relatively transparent particles contribute to cooling. The effect is non-uniform over the region, because of their short lifetimes (less than 2 weeks or 1 month)in the atmosphere. Our activities are focused on field observations, satellite data analysis, and laboratory studies to better understand the transformation and transport processes important to determine the geographical and tempral variations of the trace species in the atmosphere.

Projects

1. In-situ field observations: O3, aerosols, and related parameters

We perform intensive field campaigns/long-term observations at selected sites in East Asia. We observe concentrations of ozone, its precursors, and aerosol chemical species, as well as aerosol optical parameters. We evaluate model simulations (and thus emission inventories) and perform process analyses for the causes of the variability (e.g., transportation and transformation, ozone production rate and regimes). Aerosol mass closure and chemical-physical-optical point closure are also our focus. Recent major field studies took place at Fukue Island, west of Japan, and at Rudong in China. We also took part in summertime intensive observations at the summit of Mt. Fuji for 2008-2010. We collaborate with Professors Zifa Wang and Meigen Zhang (IAP/CAS), NIES, NPO Valid Utilization of Mt. Fuji Weather Station, and other universities/research institutes.


further information for 1

2. Field remote sensing observations: MAX-DOAS network

We developed light-weighted MAX-DOAS instrument, which observe UV/vis spectra of scattered sunlight at selected elevation angles from ground to retrieve vertical profiles/column amount of NO2 and aerosols. The instruments are distributed to form a Japan/Korea/China/Russia monitoring network. Shipborne observations are also started on JAMSTEC's Research Vessels. The main objectives are to validate satellite observations of tropospheric NO2 column densities and aerosol optical depth (AOD), to observe diurnal variations/vertical profiles beyond the capabilities of the current satellite sensors, and to validate chemical transport model simulations. This research is conducted under a GEOSS-related funding sponsored by MEXT (FY2006-2010). We collaborate with GIST (Gwangju, Korea), AIOFM/CAS (Hefei, China), IAP/RAS (Zvenigorod/Moscow, Russia), and IAO/RAS-SB (Tomsk, Russia).

further information for 2

3. Satellite data analysis

satellite

We analyze satellite-based air quality data set in East Asia, to scale up the in-situ observations mentioned above. We also contribute to a new plan to observe air quality over East Asia from a geostationally satellite.


4. Laboratory studies and development of new instruments

We also perform laboratory experiments to verify hypotheses brought back from field studies; for example, determination of uptake coefficients of HO2 radicals on various kinds of aerosol particles, which was hypothesized from lower-than-modeled HO2 concentrations observed at Rishiri Island. We also develop new instruments: e.g., detection of single aerosol particles containing certain types of organics by fluorescence measurements.

Instruments

The instruments that we operate in the field/laboratory are shown below.

O3 monitoring instrument
O3 monitoring instrument
CO monitoring instrument
CO monitoring instrument
BC monitoring instrument
BC monitoring instrument
CO2 monitoring instrument
CO2 monitoring instrument
5 axis telescopes for MAX-DOAS
5 axis telescopes for MAX-DOAS
MAX-DOAS instrument at Fukue
MAX-DOAS instrument at Fukue
308nm laser for OH/HO2 instrument
308nm laser for OH/HO2 instrument
LIF detector for OH/HO2 instrument
LIF detector for OH/HO2 instrument
HOx detector attached to SAPHIR chamber/Juelich
HOx detector attached to SAPHIR chamber/Juelich
semi-continuous EC/OC analyzer (sunset)
semi-continuous EC/OC analyzer (sunset)
mini-vol and high-vol aerosol smapler
mini-vol and high-vol aerosol smapler
filter samples from mini-vol sampler
filter samples from mini-vol sampler
Integrating nephelometer (Radiance Research)
Integrating nephelometer (Radiance Research)
PSAP (Radiance Research)
PSAP (Radiance Research)
LAS X-II Optical Particle Counter
LAS X-II Optical Particle Counter
PM2.5 SHARP monitor
PM2.5 SHARP monitor
O3 monitoring instrument
Spectroradiometer for spectral actinic flux/J values
WIBS4 instrument for Organic aersol detection
WIBS4 instrument for Organic aersol detection
MAX-DOAS on R/V Mirai
MAX-DOAS on R/V Mirai
MAX-DOAS on R/V Mirai
MAX-DOAS on R/V Mirai
Mt. Tai scene 1
Mt. Tai scene 1
Mt. Tai scene 2
Mt. Tai scene 2
Mt. Mang
Mt. Mang