Greenhouse gases Observing SATellite-2 (GOSAT-2) Project

JAXA Supercomputer System Annual Report February 2024-January 2025

Report Number: R24ER3500

Subject Category: Space Technology

Responsible Representative: SUTO, Hiroshi, GOSAT-2 Project Team, Space Technology Directorate I
Contact Information: Rio Kajiura(kajiura.rio@jaxa.jp)
Members: Makiko Hashimoto, Shin Ishida, Kenji Kowata, Fumie Kataoka, Yuki Kobayashi, Nobuhiro Kikuchi, Taro Makino, Tomoyuki Mabuchi, Hiroshi Suto, Hideki Suetake, Shigeaki Wada, Yugi Yata

Abstract

GOSAT-2 project retrieve and estimate the global concentration distribution of major greenhouse gases including the sources and natural absorbers with high level of accuracy to contribute to environmental administration as follows.

- Improved precision of climate change predictions

- Early detection of changes in the Earth system

- Better understanding of emission reduction level of the anthropogenic greenhouse gases and changing natural sink

- Contribution to air pollution monitoring policies

Also, GOSAT-2 project researches and develops new earth observation technologies required for future earth observing satellites.

Reference URL

Please refer to 'JAXA | Greenhouse gases Observing SATellite-2 "IBUKI-2" (GOSAT-2)'.

Reasons and benefits of using JAXA Supercomputer System

GOSAT-2 project utilizes JSS3 as one of the GOSAT-2 Mission Operation System which processes the observation data of GOSAT-2. When processing algorithm is updated, JSS2 reprocesses all data observed in the past. Also, JSS2 is used as a remote storage of all data required for its reprocessing.

As the reprocessing targets of GOSAT-2 products extends to all data observed in the past, more computer resources (core, memory, storage, etc.) are required than in the real-time processing.

It is necessary to use JSS3 to shorten the reprocessing time and to provide the reprocessing products to GOSAT-2 users in a more timely manner.

Achievements of the Year

We have been transmitting L0 data from the GOSAT-2 Mission Operation System to JSS3 in preparation for reprocessing of L1 products on JSS3 since observation by TANSO FTS-2 and TANSO-CAI-2 started.

March through April in FY2023, we have updated the L1 processing algorithm as follows;

- Version 220.221;

[L1A] None.

[L1B] Apply the corrected radiance factor using the radiance degradation factor reflecting the the on-orbit calibration data for the first five years after launch and the alternative calibration.

- Version 230.230;

[L1A] Update SWIR voltage conversion factor./Bug fix: L1 processing using time error information./Bug fix: Incorrect the observation time due to the L0 condition.

[L1B] Enable SWIR radiance variation correction./Bug fix: Same as above (L1A).

The FTS-2 L1A/B and CAI-2 L1A products have been available to general users from "GOSAT-2 Product Archive" (https://prdct.gosat-2.nies.go.jp/index.html.en) since July 2019.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: N/A
Thread Parallelization Methods: OpenMP
Number of Processes: 1
Elapsed Time per Case: 5 Minute(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.05

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	0.00	0.00
TOKI-ST	57467.63	0.06
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	0.00	0.00
TOKI-TST	0.00	0.00
TOKI-TGP	0.00	0.00
TOKI-TLM	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	200.00	0.13
/data and /data2	409600.00	1.96
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	339.45	1.11

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.

ISV Software Licenses Used

ISV Software Licenses Resources
	ISV Software Licenses Used (Hours)	Fraction of Usage*2(%)
ISV Software Licenses (Total)	0.00	0.00

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.