Tsai Ya-Ling

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Tsai
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Ya-Ling
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  • Article
    Corrigendum to “Nutrient supply in the Southern East China Sea after Typhoon Morakot”
    (Sears Foundation for Marine Research, 2013-11-01) Hung, Chin-Chang ; Chung, Chih-Ching ; Gong, Gwo-Ching ; Jan, Sen ; Tsai, Ya-Ling ; Chen, Kuo-Shu ; Chou, Wen Chen ; Lee, Ming-An ; Chang, Yi ; Chen, Meng-Hsien ; Yang, Wen-Rong ; Tseng, Chiung-Jung ; Gawarkiewicz, Glen G.
  • Article
    Nutrient supply in the Southern East China Sea after Typhoon Morakot
    (Sears Foundation for Marine Research, 2013-01-01) Hung, Chin-Chang ; Chung, Chih-Ching ; Gong, Gwo-Ching ; Jan, Sen ; Tsai, Ya-Ling ; Chen, Kuo-Shu ; Chou, Wen Chen ; Lee, Ming-An ; Chang, Yi ; Chen, Meng-Hsien ; Yang, Wen-Rong ; Tseng, Chiung-Jung ; Gawarkiewicz, Glen G.
    Recent studies show that typhoons have profound effects on phytoplankton assemblages along their tracks, but it is difficult to quantitatively estimate nutrient supply after a typhoon's passage due to a lack of nutrient information before and after the arrival of a typhoon. During the passage of Typhoon Morakot (July 22 to Aug. 26, 2009), we conducted pre- and post-typhoon field cruises to study nutrient supply in the Southern East China Sea (SECS). The results showed nitrate and phosphate supplies to the water column in the SECS after the typhoon's passage were 5.6 × 1011 g-N/day and 7.8 × 1010 g-P/day which were significantly higher than those before the typhoon occurred (nitrate supply = 1 × 109 g-N/day, phosphate supply = 1.6 × 108 g-P/day). We conclude from this data, and after consulting the available physical data, that the highest nitrate concentration was caused by strong upwelling and/or vertical mixing, and input of nutrient-replete terrestrial waters. The nitrate and phosphate input related to the passage of Typhoon Morakot can account for approximately 86% and 87% of summer nitrate and phosphate supplies to the southern East China Sea.
  • Article
    Mean structure and variability of the cold dome northeast of Taiwan
    (The Oceanography Society, 2011-12) Jan, Sen ; Chen, Chung-Chi ; Tsai, Ya-Ling ; Yang, Yiing-Jang ; Wang, Joe ; Chern, Ching-Sheng ; Gawarkiewicz, Glen G. ; Lien, Ren-Chieh ; Centurioni, Luca R. ; Kuo, Jia-Yu
    The "cold dome" off northeastern Taiwan is one of the distinctive oceanic features in the seas surrounding Taiwan. The cold dome is important because persistent upwelling makes the region highly biologically productive. This article uses historical data, recent observations, and satellite-observed sea surface temperatures (SST) to describe the mean structure and variability of the cold dome. The long-term mean position of the cold dome, using the temperature at 50 m depth as a reference, is centered at 25.625°N, 122.125°E. The cold dome has a diameter of approximately 100 km, and is maintained by cold (< 21°C) and salty (> 34.5) waters upwelled along the continental slope. The ocean currents around the cold dome, although weak, flow counterclockwise. The monsoon-driven winter intrusion of the Kuroshio current onto the East China Sea shelf intensifies the upwelling and carries more subsurface water up to the cold dome than during the summer monsoon season. On a shorter timescale, the cold dome's properties can be significantly modified by the passage of typhoons, which creates favorable physical conditions for short-term Kuroshio intrusions in summer. The surface expression of the cold dome viewed from satellite SST images is often not domelike but instead is an irregular shape with numerous filaments, and thus may contribute substantially to shelf/slope exchange. As a result of persistent upwelling, typhoon passage, and monsoon forcing, higher chlorophyll a concentrations, and thus higher primary productivity, are frequently observed in the vicinity of the cold dome.