\r袁德奎¹，杨训伟¹，王 雪¹，李顺芹\r²\r
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AuthorsHTML:\r袁德奎¹，杨训伟¹，王 雪¹，李顺芹\r²\r
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AuthorsListE:\rYuan Dekui ¹，Yang Xunwei ¹，Wang Xue ¹，Li Shunqin \r²\r
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AuthorsHTMLE:\rYuan Dekui ¹，Yang Xunwei ¹，Wang Xue ¹，Li Shunqin \r²\r
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Unit:\r\r1. 天津大学机械工程学院，天津 300350；\r
\r\r2. 天津商业大学理学院，天津 300134\r
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Unit_EngLish:\r1. School of Mechanical Engineering，Tianjin University，Tianjin 300350，China；
2. School of Science，Tianjin University of Commerce，Tianjin 300134，China\r
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Abstract_Chinese:\r\r藻华对海洋生态环境有重要的影响．叶绿素\ra\r是浮游植物光合作用的主要色素，其变化可以反映藻华的总体特征．通过分析叶绿素\ra\r浓度的均值和累计方差分别得到\r2007—2017\r年渤海浮游植物的空间分布特征和藻华的开始时间，并统计了藻华事件的发生次数、持续时间和藻华期间叶绿素\ra\r浓度的增长率、增长幅度等特征变量；用经验正交函数方法分析了部分特征变量的空间及年际变化；讨论了风力混合强度对藻华事件的影响．结果表明：渤海叶绿素\ra\r浓度在空间上呈近岸高、中部海域低的分布特征；辽东湾区域藻华事件发生次数较多，其他近岸海域的发生次数较少；近岸海域藻华事件的开始时间比中部海域相对较晚；叶绿素\ra\r浓度的增长率基本呈现出从近岸到远海逐渐增大且春季增长率比夏秋季偏高的趋势；在叶绿素\ra\r浓度的增长幅度上，北部海域低于南部海域；以\r2011\r年为转折点，近年来春季藻华持续时间比夏秋季长；在年际变化上春季的开始时间和增长幅度变化特征基本一致，与叶绿素\ra\r浓度增长率的特征相反；夏秋季藻华的上述空间分布特征在\r2008\r年、\r2012\r年比其他年份更明显；风力混合强度与藻华的开始时间相关性较强，与叶绿素\ra\r浓度的增长率关系较弱，与增长幅度基本无关．对于渤海藻华事件的时空分布特征的分析，有助于增进对渤海生态系统特征及其影响因素的认识．\r\r
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Abstract_English:\r\rPhytoplankton blooms have an important impact on the marine ecosystem\r．\rChlorophyll-a is the main pigment in phytoplankton photosynthesis\r，\rand changes in its spatial and temporal distribution can indicate the overall characteristics of a phytoplankton blooms\r．\rBy analyzing the average and cumulative variance of chlorophyll-a concentrations\r，\rspatial distribution characteristics and the onset of phytoplankton blooms in the Bohai Sea were obtained from 2007 to 2017\r．\rCharacteristic variables were calculated\r，\rincluding times and duration of phytoplankton blooms and the increasing rate and magnitude of chlorophyll-a concentrations during blooms\r．\rSpatial and interannual variations in the characteristic variables were analyzed using the empirical orthogonal function method\r．\rThe influence of wind mixing on blooms is discussed\r．\rResults showed that the concentration of chlorophyll-a in the nearshore area was higher than that in the central sea\r．\rBloom times were high in the Liaodong Bay area and low in the nearshore area\r．\rThe onset of phytoplankton blooms in the coastal area was relatively late compared to that in the central sea. The rate of increase in chlorophyll-a concentration gradually increased from the nearshore area to the central sea\r，\rand was higher in spring than in summer and autumn\r．\rThe magnitude of chlorophyll-a concentration in the northern area was lower than that in the southern area\r．\rSince 2011\r，\rthe durations of phytoplankton blooms in spring have been longer than those in summer and autumn\r．\rInterannual variations in the onset and magnitude of the spring blooms were generally similar\r，\rwhile the rate of increase in chlorophyll-a concentration showed differences in interannual variations\r．\rThe above spatial distribution characteristics of phytoplankton blooms in summer and autumn are more obvious in 2008 and 2012 than in other years\r．\rWind mixing was strongly correlated with the onset of the blooms\r，\rweakly correlated with the rate of increase in chlorophyll-a concentration\r，\rand uncorrelated with the magnitude\r．\rThe analysis of temporal and spatial distribution characteristics of phytoplankton blooms in the Bohai Sea would be helpful in developing an understanding of the characteristics and driving forces of the Bohai Sea’s marine ecosystem\r．\r\r
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Keyword_Chinese:渤海；藻华；叶绿素a；时空分布特征；经验正交函数\r

Keywords_English:Bohai Sea；phytoplankton blooms；chlorophyll-a；temporal and spatial distribution characteristics；empirical orthogonal function(EOF)\r


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