Japan Geoscience Union Meeting 2023

Presentation information

[J] Online Poster

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG44] Future global ocean observation system: complementarity of autonomous and shipboard observations

Fri. May 26, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (9) (Online Poster)

convener:Shigeki Hosoda(JAMSTEC), Shota Katsura(Atmosphere and Ocean Research Institute, The University of Tokyo), Yosuke Fujii(Meteorological Research Institute, Japan Meteorological Agency), Shuhei Masuda(Japan Agency for Marine-Earth Science and Technology)

On-site poster schedule(2023/5/25 17:15-18:45)

10:45 AM - 12:15 PM

[ACG44-P07] Current State and impact of abrupt salty drift in Argo salinity profile data

*Kanako Sato1, Shigeki Hosoda1, Toshio Suga1,2 (1.Japan Agency for Marine-Earth Science and Technology, 2.Tohoku University)

Keywords:Argo, Salinity, Quality control

Thanks to Argo, which is the international program for ocean observation, temperature and salinity in the ocean shallower than 2000dbar have been monitored and their profile data have been accumulated. More than 150,000 profile data have been obtained annually since 2013.
It has recently been reported that the Sea-Bird Scientific CTD sensors on the Argo floats with abrupt salty drift (hereafter, ASD) have been found. In JpGU2022, we reported that the number of ASD floats in the global ocean has been increasing since 2015, and that salinity profiles that cannot be used for research account for 16% of all salinity profiles obtained during the year 2021. Its rate during the year 2022 is 16.8%. The current status has not improved.
The Argo has decided to implement two types of quality control for the profiles observed by floats: real-time quality control, in which the profiles are flagged by simple quality control, and the delayed-mode quality control, in which advanced quality control is applied so that they can be used for research purposes. The former data are released in Global Data Assembly Center immediately after receiving the profile data from floats, and the latter data are done about one year later. The profile data are not only set the flags but also corrected in the delayed-mode quality control if necessary, according to a method agreed on by the Argo Data Management Team. We will report the effect of a reduction in the salinity profiles available for research due to the ASD problem and the effect of correction by delayed-mode quality control, using the product data of MOAA GPV.