

FOLLOWUS
1.College of Mathematics and System Science, Shandong University of Science and Technology, Qingdao 266590, China
2.CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
5.University of Chinese Academy of Sciences, Beijing 100049, China
6.CAS Engineering Laboratory for Marine Ranching, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
xuzhenhua@qdio.ac.cn
Received:16 December 2022,
Published:01 March 2024
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YU Zheyuan,HAO Zhanjiu,XU Zhenhua,et al.Satellite observations of coastal upwelling in the northern Arafura Sea[J].Journal of Oceanology and Limnology,2024,42(02):361-376.
YU Zheyuan,HAO Zhanjiu,XU Zhenhua,et al.Satellite observations of coastal upwelling in the northern Arafura Sea[J].Journal of Oceanology and Limnology,2024,42(02):361-376. DOI: 10.1007/s00343-023-2390-4.
Coastal upwelling is significant
for marine ecosystems by lifting nutrient-rich deep waters into the euphotic zone
thereby increasing primary and secondary productivity. The satellite observations show that the northern Arafura Sea (NAS)
especially in the coastal region
features high chlorophyll-
a
(chl-
a
) concentrations
implying a strong coastal upwelling. However
coastal upwelling in the NAS has not received much attention. Based on a semi-automatic image processing technology
the seasonal and interannual variability of coastal upwelling in the NAS are investigated in this study using satellite-observed sea surface temperature (SST) and wind data. The results suggest that there are seasonal coastal upwelling events in the NAS modulated by upwelling-favorable southeast monsoon (SEM). The annual mean days
mean area
and annual mean intensity of coastal upwelling events during the SEM season are 92 days
6 514 km
2
and -5.31×10
5
respectively
while the corresponding values during the northwest monsoon (NWM) season are 32 days
5 569 km
2
and -1.41×10
5
. It is also found that the SEM coastal upwelling in the NAS displays prominent interannual variability. The strong upwelling events are found in 2010
2013
2016
and 2017 when the southeast monsoon winds were weaker. Further analysis suggests that at the interannual scale
the upwelling index (UI) averaged in the SEM season is negatively correlated with that of three upwelling indicators. This can be attributed to the limitation of onshore geostrophic flow which is evidenced by the negative correlation between the UI and the alongshore difference in sea surface height. This study highlights the important role of the southeast monsoon in the temporal variability of coastal upwelling in the NAS.
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