29 Jun 2022
29 Jun 2022
Status: this preprint is open for discussion.

Satellite-detected sea surface chlorophyll-a blooms in the Japan/East Sea: magnitude and timing

Dingqi Wang1,2, Guohong Fang1,3,4, Shuming Jiang1,2, Qinzeng Xu1, Guanlin Wang1,3,4, Zexun Wei1,3,4, Yonggang Wang1,3,4, and Tengfei Xu1,3,4 Dingqi Wang et al.
  • 1First Institute of Oceanography and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
  • 2College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266061, China
  • 3Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
  • 4Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao 266061, China

Abstract. The Japan/East Sea (JES) is known as a mid-latitude “Miniature Ocean” that features multiscale oceanic dynamics processes. We investigate the variability of the sea surface chlorophyll-a concentration (SSC) and bloom timing in the JES based on satellite remote sensing products spanning 1998–2019. The JES SSC exhibits strong seasonal variability and blooms twice annually, which are mainly governed by the physical environmental conditions. However, the influences of local oceanic dynamic processes (e.g., upwelling, oceanic fronts, mesoscale eddies, and near-inertial oscillations) on the bloom magnitude and timing of the entire JES are not critical, compared with the PAT and stratification. In addition, significant interannual variabilities of spring bloom magnitude occur along the JES's northwestern coast, and that of fall bloom magnitude occur in the deep Japan Basin. For spring bloom, the interannual variability of the bloom timing (initiation timing, termination timing and duration), which significantly affect the interannual bloom magnitude anomalies, are correlated with climate modes such as AO and ENSO. For fall bloom, on the interannual time scale, the bloom duration is mainly affected by the initiation timing. Both of them have a significant influence on the bloom magnitude. The initiation/termination timing of spring blooms has shifted earlier by 0.37/0.45 days annually along the JES's northwestern coast; the counterpart of fall blooms has shifted 0.49/1.28 days earlier annually in the deep Japan Basin.

Dingqi Wang et al.

Status: open (until 14 Sep 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-547', Yuntao Wang, 02 Jul 2022 reply
    • AC1: 'Reply on RC1', Tengfei Xu, 16 Jul 2022 reply
  • RC2: 'Comment on egusphere-2022-547', Anonymous Referee #2, 02 Aug 2022 reply

Dingqi Wang et al.

Dingqi Wang et al.


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Short summary
The JES is a mid-latitude “Miniature Ocean” featured by multiscale oceanic dynamical processes and sea ice, which strongly influence the JES SSC. However, the dominant factors that favor and/or restrict SSC and how they influence JES SSC on different time scales are not clear. In this study, these issues are investigated using EOF and PCA methods based on high-resolution satellite-derived SSC data provided by the Copernicus Marine Environment Monitoring Service (CMEMS).