Chinese Journal of Polar Research

Chinese Journal of Polar Research ›› 2022, Vol. 34 ›› Issue (4): 441-451.DOI: 10.13679/j.jdyj.20210086

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Temporal and spatial variation of Chlorophyll a concentration in Nuup Kangerlua Fjord, Greenland

Tian Jiahui1, Cheng Xiao1,2,3,4, Zhang Yannan2,4   

  1. 1State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, 
    Beijing 100875, China;
    2School of Geospatial Engineering and Science, Sun Yat-sen University, Zhuhai 519082, China;
    3 Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China;
    4University Corporation for Polar Research, Beijing 100875, China
  • Online:2022-12-31 Published:2023-01-12

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Abstract: The temporal and spatial distribution of Chlorophyll a (Chl a) concentration in Nuup Kangerlua Fjord is an indicator of climate change. The spatiotemporal distribution of Chl a concentration in this region from 2016 to 2020 was therefore analyzed by combining the Chl a data obtained from Sentinel-3 OLCI inversion by C2RCC algorithm, Operational Sea Surface Temperature and Ice Analysis (OSTIA) sea surface temperature (SST) data, and data from a nearby meteorological station (at Nuuk). The results show that the distribution of Chl a was mainly affected by wind speed, wind direction and SST at the fjord inlet. The peak time of Chl a concentration was about one month later than that of SST and is most widespread when the winds are at their strongest in September. At the outlet of the glacier, in addition to being influenced by wind and water temperature, the spring bloom of Chl a is followed by a second bloom in autumn, driven by meltwater from glaciers.

Key words: glacial fjords, Chlorophyll a, Sentinel-3 OLCI, C2RCC