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

JAXA Supercomputer System Annual Report February 2021-January 2022

Report Number: R21ER3500

Subject Category: Space Technology

Responsible Representative: KUZE Akihiko, GOSAT-2 Project Team, Space Technology Directorate I
Contact Information: Yoko Ueda(ueda.yoko@jaxa.jp)
Members: Makiko Hashimoto, Shin Ishida, Kenji Kowata, Fumie Kataoka, Yuki Kobayashi, Nobuhiro Kikuchi, Taro Makino, Tomoyuki Mabuchi, Takaaki Nishino, Kohei Sugimoto, Hideki Suetake, Yoko Ueda, Shigeaki Wada, Tomoo Yamasaki, Takehito Yoshida

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 JSS2 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 JSS2 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.

In FY2021, we have updated the L1 processing algorithm for TANSO-FTS-2 three times and TANSO-CAI-2 one time and reprocessed the past observation data on JSS3 each time.

The version-up history of GOSAT-2 TANSO-FTS-2 L1 product is shown below.

– Version 201.201 : Aug..2021 [L1A/B] Change in TIR calibration formula (non-linearity correction in spectral domain) [L1B] Change in TIR scan mirror reflectance calculation formula

– Version 202.202 : Nov.2021 [L1A] No change other than the versioninumber increment [L1B] Update of the non-linearity correction for TIR/the scan mirror reflectance for TIR/the radiance conversion factor for SWIR Prototype version

– Version 210.210 : Jan.2022 [L1A/B] Adjustment for the ZPD position misalignment Correction for the discontinuous data of the satellite locatioin

The version-up history of GOSAT-2 TANSO-CAI-2 L1A product is shown below.

– Version 103.103 : Jan.2022 Change in quality evaluation for only either forward or backword looking scenes

The FTS-2 L1A/B and CAI-2 L1A product has been available to general users from “GOSAT-2 Product Archive” (https://prdct.gosat-2.nies.go.jp/en/index.html) 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(%): 0.01

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	88271.98	0.11
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	175.76	0.17
/data and /data2	205457.62	2.20
/ssd	757.62	0.20

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	170.43	1.15

*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.