2007 Annual Report - jamstec japan agency for marine-earth ...

production in June. Even in July inflow transport contributes
about a half of in situ photochemical production at Mt. Huang.
The ozone pollution in the Central East China has thus been
characterized in this study.
c. Data analysis of intensive field campaign at Mt. Tai in China
As a part of the project " Spatial and temporal variability
and climate impact of ozone and black carbon in Asia" granted
by Global Environmental Research Fund, Ministry of the
Fig. 6 Concentrations of BC and EC measured y several different
types of instruments during the Mt. Tai campaign in June 2006.
Environment, Japan, a month-long intensive field campaign at
Mt. Tai has been conducted in June 2006, and data analysis has
been made in 2007. In addition to the JAMSTEC scientists,
those in National Institute for Environmental Studies, Tokyo
Metropolitan University, Hokkaido University, Institute of
Atmospheric Physics Chinese Academy of Sciences, and
Fudan University have joined this campaign.
Figsures 6 and 7 show the time series of the concentrations
of BC/EC and O 3 /CO/NOx/NOy obtained during the campaign,
respectively. From Fig. 6 average concentration of BC
PM2.5 by MAAP is obtained at 3.7g/m -3 maximum
hourly averaged value is 40.8g/m -3 , and those of O 3 , CO,
Fig. 7 Concentrations of O 3 , CO, and MAAP-BC observed in the Mt.
Tai campaign in June 2006.
and NOx and NOy are obtained at 82, 560, 1.1 and 6.7 ppbv,
respectively, from Figure7. Very high concentrations of BC,
CO and NOx on June 5-7, and 11-13 as seen in Figures 6 and 7
hatched period are due to biomass burning after harvesting
of spring wheat, and it appeared that such agricultural waist
burning has significant impact on ozone and aerosol pollution
in the North China Plain in June. Further, diurnal variation seen
particularly in the later half of June in Figure6, is due to the
diurnal variation of mixing layer height.
From the analysis of the observational data, radiative forcing
of O 3 and BC at Mt. Tai in June has been estimated as
shown in Table 2. The radiative forcing of O 3 and BC at the
tropopause are 0.64 and 2.75 W/m 2 . It is concluded that they
exert large radiative impact regionally as compared to longlived
greenhouse gases.
Table 2 Radiative forcing of O 3 and BC at Mt. Tai in June calculated
from the observational data
d. Intercomparison of inverse calculation of CO 2 flux by
FRCGC-NIES and JMA models
In this program, source-sink flux estimation of CO 2 with
the highest spatial segmentation globally 64 by high resolution
1 1 FRCGC/NIES transport model has been
conducted with the use of Earth Simulator. In this fiscal year, as
a part of Earth Simulator Project, Intercomparison between
JMA and FRCGC/NIES models has been made under the same
conditions collaborating with Japan Meteorological Agency.
Figure 8 compares the 24-regional segregation so far used in the
international intercomparison program TransCom3, and
the 64-segregation used in the present study. Among observational
data at surface by ground-based and shipboard measurements
and in the upper troposphere by aircrafts, only those
whose difference from the forward model simulation is less
than 2 ppmv were used for the inverse modeling.