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

le heat fluxes at 1-2 km scale, sinchirometer was applied at
Yakutsk site.
(3) Land hydrological cycle model was developed, and seasonal
variation of various regional distribution of hydrological
cycle components such as active layer depth, soil moisture and
others applying this model and in-situ data as forcing data
(Fig.3).
(4) Evaluation of glacier shrinkage and in-situ observation of
west Mongolian glaciers were started in 2007 (Fig.4). As a
result, it was found that glacier area decreased 31% during the
recent 50 years, and also ground observation showed that
2007/2008 year was a year of high negative mass balance.
Atmospheric Convection Research Group
In order to summarize joint studies on mesoscale and
large-scale precipitation phenomena in the Baiu frontal zone
with Chinese researchers, the Japan-China Joint Workshop on
Cloud and Precipitation was held at Yokohama in November,
2007. Future observation plans over the China were also discussed.
Long-range continuous observations with Doppler radar
and ground-based measurement systems were executed to
detect cloud systems and precipitation in the Palau areas. In
Philippine, observations with automatic weather systems on
surface were also continued.
The impact experiments were performed by adding dropsonde
data obtained around the Palau area into the numerical
model with reanalysis (ALERA). The result indicates the large
positive impacts of winds and moisture are found over the
downstream areas such as Japan Islands (Fig.5) . This shows the
close relationship between tropics and mid-latitudes.
Fig. 2 Long-term variation of 3.2m depth annual mean ground temperature
in Eastern Siberia. The shown value is the average value of
three site (Verhoyansk, Pokorovsk, Tomot) with high quality data.
Soil moisture
Active layer
Fig. 3 Simulation result by land hydrological cycle model. The
mean active layer depth for the period of 1986-2004(right), and soil
moisture down to 3m depth for July 22, 2002(left) are shown.
Fig. 5 Impact of horizontal winds at 700 hPa on the dropsonde
data at PALAU2005. Reddish colors mean the high impact.
(3)Global Warming Observational Research Program
The goal of the observational research on the ocean and
sea ice is to develop further insights into ocean structure and the
carbon cycle which are related to global warming. This research
is conducted in the Arctic Ocean, where variations in sea ice are
considered to provide an indicator of global warming, and in
Fig. 4 Photograph of Potanin Glacier below the Tavan Bogd Peak in
Western Mongolia where in-situ observation was made in 2007. In the
foreground, Automatic Meteorological Observation System which
obtained full-year data is shown.
the high latitudes of the Pacific Ocean where the biological productivity
and the ocean uptake of CO 2 are high due to nutrient
transport to ocean surface with the upwelling of deep-sea water.
The paleoceanic environment is also examined by using marine
sediment with the aim of reconstructing climatic changes that
have occurred over the last few tens of thousands of years, in
order to contribute to advancements in the prediction of
changes in the global environment.
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