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

JAXA Supercomputer System Annual Report April 2019-March 2020

Report Number: R19ER3500

Subject Category: Space Technology

PDF available here

  • Responsible Representative: KUZE Akihiko, GOSAT-2 Project Team, Space Technology Directorate I
  • Contact Information: Shin Ishida(ishida.shin@jaxa.jp)
  • Members: Yoko Ueda, Tomoo Yamasaki, Yuki Kobayashi, Taro Makino, Shin Ishida, Junichi Takaku, Kenji Kowata, Takehito Yoshida, Fumie Kataoka, Makiko Hashimoto, Hideyuki Noguchi, Hideki Suetake, Tomoyuki Mabuchi, Nobuhiro Kikuchi

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 JSS2 in preparation for reprocessing of L1 products on JSS2 since observation by TANSO FTS-2 and TANSO-CAI-2 started.

In FY2019, we have updated the L1 processing algorithm for TANSO-FTS-2 and TANSO-CAI-2 three times and reprocessed the past observation data on JSS2 each time.

The version-up history of GOSAT-2 TANSO-FTS-2 1B product is shown below.

– Version 002.004 : Apr.2019 Preparation for initial calibration version (L+6M)

– Version 100.100 : Jul.2019 After initial calibration version (L+9M) (Release to general users)

– Version 101.101 : Apr.2019 Bug fix

The version-up history of GOSAT-2 TANSO-CAI-2 1A product is shown below.

– Version 000.001 : Apr.2019 Preparation for initial calibration version (L+6M)

– Version 100.100 : Jul.2019 After initial calibration version (L+9M) (Release to general users)

– Version 101.101 : Apr.2019 Bug fix

The FTS-2 L1B and CAI-2 L1B 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 JSS2

Computational Information

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

Resources Used

 

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

 

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

Computational Resources
System Name Amount of Core Time
(core x hours)
Fraction of Usage*2(%)
SORA-MA 0.00 0.00
SORA-PP 14,958.23 0.10
SORA-LM 0.00 0.00
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 148.93 0.12
/data 129,931.83 2.22
/ltmp 30,501.32 2.59

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 0.00 0.00

*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.

JAXA Supercomputer System Annual Report April 2019-March 2020