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recent progress of gosat and gosat-2 swir l2 …...cai / cai-2 spectral ranges (nadir/ forward/ b...

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  • Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333
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Recent progress of GOSAT and GOSAT - 2 SWIR L2 products Y. Yoshida ([email protected]), H. Oshio , Y. Someya, H. Ohyama , A. Kamei, I. Morino , O. Uchino, T. Saeki, Y. Niwa , M. Saito, H. Noda, T. Matsunaga, and TCCON partners

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Page 1: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

Recent progress of GOSAT and GOSAT-2 SWIR L2 products

Y. Yoshida ([email protected]), H. Oshio, Y. Someya, H. Ohyama, A. Kamei,

I. Morino, O. Uchino, T. Saeki, Y. Niwa, M. Saito, H. Noda, T. Matsunaga,

and TCCON partners

Page 2: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT & GOSAT-2GOSAT (2009.01 ~ ) GOSAT-2 (2018.10 ~ )

revisit cycle (alt.) 3-day (666 km) 6-day (613 km)target gases CO2, CH4, H2O CO2, CH4, H2O, CO

FTS / FTS-2

Spectral Ranges /

SNR

12900 ~ 13200 cm-1 / 3435800 ~ 6400 cm-1 / 3164800 ~ 5200 cm-1 / 410700 ~ 1800 cm-1 / 304

12950 ~ 13250 cm-1 / 5625900 ~ 6400 cm-1 / 5094200 ~ 5200 cm-1 / 3791188 ~ 1800 cm-1 / 1045

700 ~ 1188 cm-1 / 350

Sampling 1.1, 2, 4 sec/scan10.5 kmφ

4 sec/scan9.7 kmφ

Pointing AT: ±20 deg., CT: ±35 deg. AT: ±40 deg., CT: ±35 deg.Intelligent pointing

CAI / CAI-2

Spectral Ranges(Nadir/

Forward/Backward)

370 ~ 390 nm (N)664 ~ 684 nm (N)860 ~ 880 nm (N)

1555 ~ 1645 nm (N)

333 ~ 353 (F), 371 ~ 391 (B)433 ~ 453 (F), 540 ~ 560 (B)663 ~ 683 (F), 663 ~ 683 (B)858 ~ 878 (F), 858 ~ 878 (B)

1582 ~ 1672 (F),1582 ~ 1672 (B)Spatial

Resolution / Swath

0.5 km / 1000 km (others)1.5 km / 750 km (1.6 µm)

0.46 km / 920 km (others)0.92 km / 920 km (1.6 µm)

Page 3: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT & GOSAT-2 : SWIR L2 Products

GOSAT:CO2 column amount productCH4 column amount productH2O column amount product

~ XCO2, XCH4, and XH2O over the cloud-free region are simultaneously retrieved by the full-physics based algorithm.

GOSAT-2:chlorophyll fluorescence and proxy-method product

~ SIF, proxy-based XCH4 & XCO, and aerosol/cloud related information are retrieved under the cloud-free assumption.

column-averaged dry-air mole fraction product~ XCO2, XCH4, XCO, and XH2O over the cloud-free region are

simultaneously retrieved by the full-physics based algorithm.

Page 4: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT & GOSAT-2 : FTS observation pattern

Page 5: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT & GOSAT-2 : SWIR spectrum

Further investigation is required for radiometric calibration.

G1 < G2~ 10% Diff.

G1 > G2~ 3% Diff.

G1 ≈ G2

Page 6: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT-2 : Spectral fitting (clear-sky assumption)

Page 7: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT-2 : proxy-based XCH4 & XCO

Preliminary results.

Cloud-screening is insufficient, because CAI-2 data is not used.Only FTS-2 2 µm-band cloud-screening is applied.

Page 8: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT-2 : Comparison with other satellite

GOSAT-2 TROPOMI

Page 9: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT : 10-year observational data !

Bias uncorrected => Bias corrected:

V02.72 (L1B V201.202) => V02.75: 2009.04 - 2018.11

V02.80 (L1B V210.210) => V02.85 (under preparation): 2009.04 - current

Page 10: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

GOSAT : SWIR L2 V02.75

Empirical bias correction based on the

TCCON data is applied.

The correction coefficients are

evaluated for land & H-gain, land & M-

gain, and ocean cases.

Biascorrection

Gain-dependent bias is reduced after bias correction.

Page 11: Recent progress of GOSAT and GOSAT-2 SWIR L2 …...CAI / CAI-2 Spectral Ranges (Nadir/ Forward/ B ackward) 370 ~ 390 nm (N) 664 ~ 684 nm (N) 860 ~ 880 nm (N) 1555 ~ 1645 nm (N) 333

Summary

GOSAT-2 proxy based XCH4 and XCO look reasonable. TROPOMI shows similar spatial pattern. Agree well with GOSAT full-physics based XCH4.

Radiance level is mismatched between GOSAT and GOSAT-2. Degradation model of TANSO-FTS/GOSAT is under re-evaluation. Investigate solar calibration data of TANSO-FTS-2/GOSAT-2.

Updates of solar irradiance model and gas absorption coefficientare under investigation.


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