一次弱台风对叶绿素a浓度的强烈增强
Strong enhancement of chlorophyll a concentration by a weak typhoon
摘要：
近年来的研究表明，台风可显著提高海洋表层叶绿素a（chl a）浓度。对1997-2007年南海中部海域叶绿素a浓度进行了研究。只有一级（最小）台风Hagibis（2007年）对叶绿素a浓度有显着的影响。台风“海贝思”因其位置靠近赤道，具有较强的上升流潜势，其强迫时间（>82 h）远长于地转调整时间（~63 h）。较高的上升流速度和较长的强迫时间增加了混合层的深度，从而导致了强烈的浮游植物水华，占南海中部年总叶绿素a浓度的30%左右。这意味着，台风的强迫时间应该足够长，以建立一个强大的上升流，从而诱导显着的上层海洋附应。
英文摘要：
Recent studies demonstrate that chlorophyll a (chl a) concentrations in the surface ocean can be significantly enhanced due to typhoons. The present study investigated chl a concentrations in the middle of the South China Sea (SCS) from 1997-2007. Only the Category1 (minimal) Typhoon Hagibis (2007) had a notable effect on the chl a concentrations. Typhoon Hagibis had a strong upwelling potential due to its location near the equator, and the forcing time of the typhoon (>82 h) was much longer than the geostrophic adjustment time (~63 h). The higher upwelling velocity and the longer forcing time increased the depth of the mixed-layer, which consequently induced a strong phytoplankton bloom that accounted for about 30% of the total annual chl a concentration in the middle of the SCS. The implication is that the forcing time of a typhoon should be long enough to establish a strong upwelling and consequently for the induction of significant upper ocean responses.
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