Observation plan in NE Asia
Jun Asanuma
Terrestrial Environment Research Center
Tsukuba University
RAISE
(Rangelands Atmosphere-Hydrosphere-Biosphere Interaction
Study Experiment in Northeastern Asia)
Period:
2001/12-2006/11 (Obs. 2002-: IOP 2003)
Objectives:
Better understandings of the interaction between
hydrosphere, atmosphere in the targeted region,
and biosphere and human impact on it.
Target Area:
upper Kherlen river basin
Observations; tower flux
forest(larch forest)
•Radiation, water/heat/carbon budget
•year-round observations since 2003
•First EC flux measurements in the area
fensed area in
KBU
grassland (KBU, semi-arid steppe)
2.広域地表面熱収支:混合層分散法
Aircraft
・実施期間:2003年7,8,10月(11回)
・飛行高度:地上200,500,1000m
地上観測サイト上空で高度別に往復
・飛行パス長:約10km(5分)
・測定項目:気温,湿度,地表面放射温度
短波放射(上下),GPS位置情報
・記録間隔:気象測定=0.1秒,GPS=2秒
47.5
Altitude (
2000
1900
1800
1700
1600
・データ前処理
温湿度:線形トレンド除去
1500
1400
KBU
1300
1200
放射センサ
1100
熱電対
Kherlen R.
47
108.5
AN-2
湿度計
109
KBU周辺航空機パス(2003/08/22)
Data publications from/through RAISE
Obs. by RAISE(2002-)
Water/heat/carbon
budget at the 2 tower
sites
GPS precipitable water ;
4 sites
river discharge, ground
water, isotope
vegetation and soil
characteristics
will be published as DVD
in 2007
Obs. by Inst. Met. & Hydro.
(1993-RAISE period)
surface stations
will be available in 2007
through RAISE data base
CEOP also has a plan for the
data opening.
Quality check will be involved.
Observed precipitation and
evapotranspiration
森林
草原
120
100
rain
ET (mm)
80
60
60
40
40
20
20
0
0
J
F
M
A
M
J
J
Month
A
S
O
N
Steppe 2003
PPT
ET
100
80
ET (mm)
120
Forest 2003
PPT
ET
D
J
F
M
A
M
evapotranspiration
E at forest is radiation-controlled
E at grassland is soil-moisture-controlled
J
J
Month
A
S
O
N
D
森林
300
Interannual variation
of water budget
E
P
250
E
200
草原
E
P
250
200
P
150
300
150
100
100
50
50
0
E
P
0
2003
2004
2005
2003
2004
Larger amount of rain at the forest (upper basin)
significant recharge region of groundwater and river water
Evaporation at the forest follows rainfall
radiation-controlled evaporation
Evaporation at the grassland in almost contant
soil-moisture-controlled evaporation
2005
Colored water
analysis w/ RCM
A
B
Mongolia
(A)105-110E, 45-50N
2003.6.1
Sato et al. (in preparation)
(B)110-115E-40-45N 2003.9.1
ZM-NoC: 500hPa w
B
Why it is dry?
ZM-NoC: w at 90 E
A
A
[x0.1 m/sec]
B
Tibetan
Plateau
Mongolian Plateau
[x0.1 m/sec]
 ZM-NoC: equilibrium between ZM and radiation
(non-adiabatic heating:radiation only, dry RCM)
 Dry convection over Tibetan plateau and its slopes
 Distinct ubsidence over the dry region at 300~700hPa
Hypothetical view
In spring when the subtropical jet is
located at the south of Tibetan
Plateau ...:
Subsidence over northen india.
> delayed monsoon-onset
Sato & Kimura (MWR, in revision)
5,6月
7,8月
When the subtropical jet goes
upto north....:
Subsidence over north of
Tibetan plateau (Takramakan,
Govi).
> suppressed rainfall in the
warm season
Sato & Kimura (2005, GRL)
Future plan
RAISE
“snap-shot” view for 2-3 years of hydroclimatology
of the region
post-RAISE
pRAISE
“interannual variability” of hydroclimatorolgy
Research Targets
Rainfall process
w ULB radar data & rain gauge mesonet
Rainfall process
interannual variations, intra-annual variations
Interannual variation of Land-atmosphere
interaction
vegetation variability and its feedback on the
atmosphere
soil-moisture dynamics and its control on the
landsurface process
Future plan (2007-2010) in pRAISE
Monitoring continued;
Kherlen river basin:
the 2 tower sites (CEOP reference sites)
river discharge, groundwater
Future plan (2007-2010) in pRAISE
ULB region (in cooperation with IORGC):
Radar data (near ULB airport),
rain gauge mesonet (will be setup)
groundwater (in cooperation with IHP)
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Observation plan in pRAISE