Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (3): 101-114.DOI: 10.3969/j.issn.1001-909X.2023.03.010

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Remote sensing research on temporal and spatial variations of ecological environments and response for Tonga volcanic eruptions in South Pacific island countries

GONG Fang1,2,3(), ZHU Bozhong1,2,4, LI Teng1,2, WANG Yuxin1,2, LI Hongzhe1,2,5, HE Xianqiang1,2,3,*(), ZHANG Qing1,2   

  1. 1. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China
    2. Second Institute of Oceanography, MNR, Hangzhou 310012, China
    3. Donghai Laboratory, Zhoushan 316021, China
    4. Ocean College, Zhejiang University, Zhoushan 316021, China
    5. The School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2022-09-30 Revised:2023-02-17 Online:2023-09-15 Published:2023-10-24


The unique geographical features of the island countries in South Pacific, which are surrounded by sea and small in size, make most of the island countries in this region "ecologically fragile areas". Based on this, multi-source satellite data were used to monitor the marine ecological environment of Nauru, Palau, Tuvalu, and the Marshall Islands. It was also focused on whether there have been significant changes in the ecological environment of various countries before and after the Tonga volcanic eruption, to help to understand the impact of the Tonga volcanic eruption. The results show that: (1) In terms of temporal and spatial distribution of climatic states, the sea surface temperature and transparency of the surrounding waters of the South Pacific island countries maintain a relatively high level, while chlorophyll and net primary productivity decrease rapidly with the increase of offshore distance. (2) Warming, acidification and sea level rising are common problems faced by the sea areas of the four island countries. (3) The eruption of the Tonga Volcano has no significant impact on the coastal TSM mass concentration and SST. (4) The phenomenon of abnormally rising surface temperature and changed suspended matter mass concentration of the island in the first half month of the volcanic eruption has implications for disaster warning and forecasting using remote sensing methods.

Key words: marine ecological environment, South Pacific island countries, Tonga volcanic eruption, remote sensing, Sentinel-2, Landsat-8

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