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GOSAT-2 (Greenhouse gases Observing Satellite-2), whose nick name is "IBUKI-2", is a JAXA satellite dedicated to the observation of Greenhouse Gases joining and expanding GOSAT capabilities. It carries enhanced versions of the two mission instruments present on GOSAT, TANSO-FTS-2 (Thermal And Near infrared Sensor for carbon Observation-Fourier Transform Spectrometer-2) and TANSO-CAI-2 (Cloud and Aerosol Imager-2).

The missions objective of GOSAT-2 are:

  • to continue and enhance spaceborne measurement of major greenhouse gases from space started by GOSAT
  • to monitor the impacts of climate change and human activities on the carbon cycle
  • to contribute to climate science and climate change related policies.

TANSO-FTS-2 is the Fourier Transform spectrometer same as the FTS on GOSAT, with improved characteristic: 5 bands (instead of 4) with the spectral range of each band optimized based on the results of the utilization of GOSAT data, two bands for the TIR, the bands other than the TIR are divided into two polarizations (P and S), extension of band 3 to observe the Carbon Monoxide.

The Instant Field of View (IFOV) is 15.8mrad which is same as GOSAT, but the footprint size became smaller from 10.5km to 9.7km due to the lower altitude of GOSAT-2. The pointing angle in the along-track direction became larger from ±20 degrees to ±40 degrees to extend the sun glint observation area and it makes possible to select the observation points freely within the capabilities of the pointing mirror moving speed. The scan duration is fixed to 4 secs. FTS-2 has 16 steps of the gain to take advantage of the dynamic range corresponding to very different radiance. FTS-2 has the function to avoid the clouds in the scene obtained by an intelligent pointing mechanism.

Items

TANSO-FTS-2/GOSAT-2

TANSO-FTS/GOSAT

Measurement Gases

CO2,CH4,O3,H2O,CO

CO2,CH4,O3,H2O

Field of View (FOV)

15.8mrad(9.7 kmφ)

15.8mrad(10.5 kmφ)

Spectral Ranges

(μm)(cm-1)

band 1 : 0.75-0.77 (12,950-13,250)

band 2: 1.56-1.69 (5,900-6,400)

band 3: 1.92-2.33 (4,200-5,200)

band 4: 5.5-8.4 (1,188-1,800)

band 5: 8.4-14.3 (700-1,188)

band 1: 0.75-0.77 (12,900-13,200)

band 2: 1.56-1.72 (5,800-6,400)

band 3: 1.92-2.08 (4,800-5,200)

band 4: 5.5-14.3 (700-1,800)

SNR

(@standard radiance)

band 1:  >400 (P@13,050cm-1)

band 2: >300 (P@6,200cm-1)

band 3: >300 (P@5,000cm-1)

              >300 (P+S@4,250cm-1)

band 4: >300 (@1,300cm-1)

band 5: >300 (@700cm-1)

band 1: >300

band 2: >300

band 3: >300

band 4: >300

Effective Aperture size

Φ73mm

Φ64mm

Gain steps

16

2

Avoidance of the cloud

Intelligent pointing

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TANSO-CAI-2 is the push-broom type imaging radiometer using linear array sensor and band pass filter same as TANSO-CAI. The LOS of CAI-2 is tilted ±20 degrees in the along track direction (on GOSAT LOS points to nadir direction); CAI-2 consists of five lens systems and each lens system has two FOVs of forward and backward viewing.

New three observation bands are added to CAI-2 in addition to the four observation bands of CAI; and three bands are available to observe in forward and backward viewings.

Items

TANSO-CAI-2/GOSAT-2

TANSO-CAI/GOSAT

Spectral Ranges (nm)

Forward Viewing

(+20 deg)

b 1 :   333-353

b 2 :   433-453

b 3 :   664-684

b 4 :   859-879

b 5 :   1585-1675

Backward Viewing

(-20deg)

b 6 :   370-390

b 7 :   540-560

b 8 :   664-684

b 9 :   859-879

b 10:  1585-1675

Nadir Viewing

 

band 1 : 370-390

band 2 : 664-684

band 3 : 860-880

band 4 : 1555-1645

Spatial Resolution

(@nadir)

except band 5, 10                 band 5, 10

460m (700rad)               920m(1,400rad)

Band 1-3                           Band 4

500m(750rad)         1,500m(2,250rad)

swath/FOV

903km/67.6 deg

(everywhere across all the globe, to be observed at least twice a recurrent cycle)

Band 1-3                         Band 4

1,002 km / 72 deg 786km / 60 deg

SNR

(@spectral-radiance/albedo)

(W/m2/sr/m)

b 1 : >200 (45/0.158)

b 2 : >200 (79/0.144)

b 3 : >200 (46/0.106)

b 4 : >200 (30/0.112)

b 5 : >200 (7/0.101)

b 6 : >200 (48/0.152)

b 7 : >200 (65/0.125)

b 8 : >200 (46/0.106)

b 9 : >200 (30/0.112)

b 10 : >200 (7/0.101)

b1 : >200 (47/0.149)

b2 : >200 (45/0.104)

b3 : >200 (29/0.108)

b4 : >200 (7/0.101)

 

Minimize Mission News

New version of GOSAT-2 data released

17 September 2019

A new version of GOSAT-2 FTS-2 and CAI-2 data (v101.101) is being published by JAXA and will be available on ESA's dedicated FTP server.

GOSAT-2 on-line dataset now available

06 August 2019

ESA is pleased to announce the availability of GOSAT-2 products to the scientific community. The data products are available through a dedicated FTP server with access immediately available after registration.

Minimize Mission Facts and Figures
Facts and figures
Operators JAXA (Japan Aerospace Exploration Agency)
Date of Launch 29 October 2018
Status Operating nominally
Orbit Height 613 km
Orbit Type Sun-synchronous
Repeat Cycle 6 days
Resolution (CAI-2 instrument): 1 km
Swath Width (CAI-2 instrument): 1000 km
Onboard Sensors provided under TPM
  • TANSO-FTS-2 (Thermal And Near infrared Sensor for carbon Observation - Fourier Transform Spectrometer)
  • TANSO-CAI-2 (Thermal And Near infrared Sensor for carbon Observation - Cloud and Aerosol Imager)