Impacts of the Kuroshio and Tidal Currents on the Hydrological Characteristics of Yilan Bay, Northeastern Taiwan

Yilan Bay is in the northeast corner of Taiwan at the junction of the East China Sea (ECS) and the Pacific Ocean. This study clarified the composition of water masses adjacent to Yilan Bay. The upper seawater in the bay is characterized by Kuroshio surface water, Taiwan warm current water, and shelf mixed water masses. The flow field in this area is mainly determined by the inter-actions among the northeastern Taiwan countercurrent, Kuroshio Current (KC), and tidal currents. The fall season is the main rainfall period in Yilan Bay, which causes a large amount of river runoff and a further increase in chlorophyll concentration, and the salinity of the upper water layer is observed much lower than other seasons. Water with a high chlorophyll concentration can flow into the ECS with ebb currents and the KC with ebb and flood currents. Combining hourly geosynchronous ocean color imager data and numerical simulation flow field helps us understand short-term changes of chlorophyll concentration. The trajectories of the drifters and virtual particle simulations help us understand the sources and movement of ocean currents in Yilan Bay. The seasonal swing of the KC path outside the bay is an important factor affecting the flow field and hydrological characteristics.

[1]  Fei Ye,et al.  Seamless cross-scale modeling with SCHISM , 2016 .

[2]  Wei‐Jen Huang,et al.  Intense but variable autotrophic activity in a rapidly flushed shallow‐water hydrothermal plume (Kueishantao Islet, Taiwan) , 2020, Geobiology.

[3]  Chong Chen,et al.  Molluscan diversity in shallow water hydrothermal vents off Kueishan Island, Taiwan , 2018, Marine Biodiversity.

[4]  S. Kimura,et al.  Dispersal Characteristics and Pathways of Japanese Glass Eel in the East Asian Continental Shelf , 2019, Sustainability.

[5]  Jiang‐Shiou Hwang,et al.  Distribution and sexual dimorphism of the crab Xenograpsus testudinatus from the hydrothermal vent field of Kueishan Island, northeastern Taiwan , 2020, PloS one.

[6]  W. Lo,et al.  Mesoscale distribution and assemblage structure of fish larvae in the Kuroshio waters off eastern Taiwan , 2019, Marine Biodiversity.

[7]  Tai-Wen Hsu,et al.  Diurnal to Seasonal Variations in Ocean Chlorophyll and Ocean Currents in the North of Taiwan Observed by Geostationary Ocean Color Imager and Coastal Radar , 2020, Remote. Sens..

[8]  Yuanzhi Zhang,et al.  Vertical Migration of the Along-Slope Counter-Flow and Its Relation with the Kuroshio Intrusion off Northeastern Taiwan , 2019, Remote. Sens..

[9]  G. Burr,et al.  Fates of vent CO2 and its impact on carbonate chemistry in the shallow-water hydrothermal field offshore Kueishantao Islet, NE Taiwan , 2019, Marine Chemistry.

[10]  Ning Li,et al.  Carbon Chemistry in the Mainstream of Kuroshio Current in Eastern Taiwan and Its Transport of Carbon into the East China Sea Shelf , 2018 .

[11]  C. Chen,et al.  Chemical and physical fronts in the Bohai, Yellow and East China seas , 2009 .

[12]  Yijun Hou,et al.  Impact of mesoscale eddies on the southwestward countercurrent northeast of Taiwan revealed by ADCP mooring observations , 2020 .

[13]  C. Chen,et al.  A salinity front in the southern East China Sea separating the Chinese coastal and Taiwan Strait waters from Kuroshio waters , 2006 .

[14]  Yueh-Yuan Tu,et al.  Tide-influenced acidic hydrothermal system offshore NE Taiwan , 2005 .

[15]  M. Chang,et al.  Response of the Kuroshio east of Taiwan to mesoscale eddies and upstream variations , 2020, Journal of Oceanography.

[16]  Biweekly periodic variation of the Kuroshio axis northeast of Taiwan as revealed by ocean high-frequency radar , 2009 .

[17]  L. Centurioni,et al.  Observations of a freshwater pulse induced by Typhoon Morakot off the northern coast of Taiwan in August 2009 , 2013 .

[18]  Bin Chen,et al.  Transport of East Asian dust storms to the marginal seas of China and the southern North Pacific in spring 2010 , 2017 .

[19]  Q. Zheng,et al.  Interaction of coastal countercurrent in I-Lan Bay with the Kuroshio northeast of Taiwan , 2018, Continental Shelf Research.

[20]  C. Chen,et al.  Biogeochemistry and dynamics of particulate organic matter in a shallow-water hydrothermal field (Kueishantao Islet, NE Taiwan) , 2020 .

[21]  X. Yao,et al.  Variability in the Correlation between Asian Dust Storms and Chlorophyll a Concentration from the North to Equatorial Pacific , 2013, PloS one.

[22]  Chengcheng Shen,et al.  Zoning strategies for marine protected areas in Taiwan: Case study of Gueishan Island in Yilan County, Taiwan , 2014 .