AMSR Series in A-Train- Status/Products/Services for GCOM-W1Keiji Imaoka 1, Norimasa Ito 1, and Taikan Oki 1,2
1 Earth Observation Research Center, Japan Aerospace Exploration Agency
2 Institute for Industrial Sciences, The University of Tokyo

A-Train User Workshop
October 25, 2010
New Orleans, USA

GCOM-W1 will join in A-Train

2

AMSR2 Instrument

AMSR2

 Deployable main reflector system with
2.0m diameter (1.6m for AMSR-E).
 Frequency channel set is identical to thatof AMSR-E except 7.3GHz channel for
RFI mitigation.
 Two-point external calibration withimproved HTS (hot-load).
 Deep space calibration maneuver tocheck consistency between main reflector
and CSM.
 Add a redundant momentum wheel toincrease reliability.

AMSR-EAMSR2 Channel Set

GCOM-W1/AMSR2 characteristics
CenterFreq.
[GHz]

Bandwidth[MHz]

6.925/
7.3

350

Incidence angle Nominal 55 degrees

10.65

100

Digitization

18.7

200

23.8

400

36.5

1000

0.35 (7 x 12)

89.0

3000

0.15 (3 x 5)

Scan and rate

Conical scan at 40 rpm

Antenna

Offset parabola with 2.0m dia.

Swath width

1450km12bitsDynamic range 2.7-340KPolarization

Vertical and horizontal

Pol.

Beam width [deg](Ground res. [km])Samplinginterval[km]1.8 (35 x 62)
VandH

1.2 (24 x 42)
0.65 (14 x 22)

100.75 (15 x 26)
5 3Page3

RFI Signals in AMSR-E Data Monthly Tb differences in July 2008
for average (top-left), standard
deviation (top-right), and scatter plot
between them (lower-left).
 Possible RFI signals are reported for
6.925 (most problematic), 10.65, and
18.7GHz channels of AMSR-E.
 Additional 7.3GHz channels are
expected to increase RFI information.
4

GCOM Data Flow5

Science Team and Products
 Science Team- Led by Professor Taikan Oki from the University of Tokyo.
- Algorithm/Validation scientists were selected via international RA.
- Selecting at-launch standard algorithms via algorithm comparison.

 Standard Product- Similar to AMSR-E, eight (8) geophysical parameters will be retrieved
and distributed as standard products.

 Research Product- Potential candidates include all-weather sea surface wind speed, sea
ice moving vector, sea ice thickness, land hydrological assimilatedproducts, solid precipitation in high latitudes, and so forth.

 Near Realtime Product6

Processing Levels
Level

Contents

Level-1A• Swath data with geolocation information• Scene counts• ½ orbit starting from northern/southern-most latitudes

Level-1B• Swath data with geolocation information• Brightness temperatures• ½ orbit starting from northern/southern-most latitudes

Level-1R• Swath data with geolocation information• Spatial-resolution matched brightness temperatures• 4 resolution sets (6,10,23,36GHz) and raw swath for 89GHz A/B

Level-2• Swath data with geolocation information• Geophysical parameters (8 parameters)• ½ orbit starting from northern/southern-most latitudes

Leve-3• Grid data with 0.1/0.25 degrees (10/25km) resolution• Brightness temperatures and geophysical parameters• Daily and monthly temporal average• Equidistant Cylindrical and Polar Stereo Projection• All products are in HDF5 format.
• Near Realtime products will be available for Level-1B/1R/2 with the granule of “receiveddata length” at ground stations (not reshaped into half orbit) to minimize data latency.

7

GCOM-W1 Standard Products
ProductsRes.

Accuracy

Range

ReleaseStandardGoal

Global

5-50km

1.5K

1.5K

1.0K (systematic)±0.3K (random)

2.7-340K

Integrated watervapor

Global, overocean

15km

3.5kg/m2

3.5kg/m2

2.0 kg/m2

0-70kg/m2

Integrated cloudliquid water

Global, overocean

15km

0.10kg/ m2

0.05kg/ m2

0.02kg/ m2

0-1.0kg/m2

Precipitation

Global, except
cold latitude

15km

Ocean 50%
Land 120%

Ocean 50%
Land 120%

Ocean 20%
Land 80%0-20mm h-1

Sea surface
temperature

Global, overocean

50km

0.5℃

0.5℃

0.2℃

-2-35℃

Sea surface
wind speed

Global, overocean

15km1.5m s-1

1.0m s-1

1.0m s-1

0-30m s-1

Sea iceconcentration

Polar region,over ocean

15km

10%

10%

5%

0-100%Snow depth

Land

30km

20cm

20cm

10cm

0-100 cm

Soil moisture

Land

50km

10%

10%

5%

0-40%

Brightness
Temperature

GEO

Areas

8

Validation Activities
 Validation by utilizing the existing observation networks:- Radiosondes and GPS networks, SST and sea surface wind speed from various buoysystem, Ground-based precipitation radar networks, Snow depth and other surface
measurements by meteorological agencies, etc.

 Specific field campaigns/monitorings- Soil moisture test sites such as Mongolia, Thailand, and CEOP sites including Australia
Murray-Darling Basin, and Snow depth test site in Yakutsuk.

 Potential interaction with other missions- SMOS and SMAP for soil moisture, GPM GV collaboration for precipitation.

Page 99

Data Distribution Service
 New Data Distribution System for GCOM-W1- Search/Order/Distribution of all GCOM-W1 standard products, together
with AMSR and AMSR-E standard products.
- Direct download (i.e. data pool) of standard products via http and sftp.
- Provision of satellite operation information and tools (e.g. I/O toolkit).
- One-time registration for search/order/download of standard products.
- Direct download of near realtime products for designated users.

 Research Product Distribution- Research products will be distributed from EORC ftp server.
- Development of integrated browse website and calibration/validation
monitoring pages are underway.
- Multi-radiometer processing (e.g. including SSM/I and TMI) and data
distribution via plain binary are under consideration.

10

Thank you for your attention.

11