Investigation of the 2006 Alexandrium fundyense Bloom in the Gulf of Maine: In situ Observations and Numerical Modeling.
Investigation of the 2006 Alexandrium fundyense Bloom in the Gulf of Maine: In situ Observations and Numerical Modeling.
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DOI：
10.1016/j.csr.2009.07.012
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发表时间：
2009-09-30
影响因子：
2.3
通讯作者：
Keafer BA
中科院分区：
文献类型：
--
作者：
Li Y;He R;McGillicuddy DJ Jr;Anderson DM;Keafer BA
利用现场观测和耦合生物物理模型研究了 2006 年缅因湾 (GOM) 亚历山大藻水华的萌芽、启动和发育。水文测量以及与 GOM 气候学的比较表明，2006 年沿海水温、盐度、水流和河流径流条件正常。与最近的其他年度孢囊调查数据相比，2006 年藻华发生前底部沉积物中的 A.fundyense 孢囊丰度处于中等水平。我们使用耦合生物物理模型来预测沿海环流和 A.fundyense 细胞浓度。应用包括水温、盐度、速度时间序列和表面 A.fundyense 细胞浓度图在内的现场数据来衡量模型的保真度。耦合模型能够很好地再现 A.fundyense 细胞浓度的流体动力学和时间和空间分布。模型后报解决方案进一步用于诊断控制水华动态的物理和生物因素。地面风场调节了水华的水平和垂直分布。研究发现，初始胞囊分布是影响 A.fundyense 水华严重程度和年际变化的主要因素。 2006 年花期的初始胞囊丰度约为 2005 年花期之前的 50%。结果，2006年海湾范围内的藻华时间平均浓度也仅为2005年的60%左右。此外，2006年沿岸流减弱和阵发性有利上升风使藻华的空间范围比2005年减少。
In situ observations and a coupled bio-physical model were used to study the germination, initiation, and development of the Gulf of Maine (GOM) Alexandrium fundyense bloom in 2006. Hydrographic measurements and comparisons with GOM climatology indicate that 2006 was a year with normal coastal water temperature, salinity, current and river runoff conditions. A. fundyense cyst abundance in bottom sediments preceding the 2006 bloom was at a moderate level compared to other recent annual cyst survey data. We used the coupled bio-physical model to hindcast coastal circulation and A. fundyense cell concentrations. Field data including water temperature, salinity, velocity time series and surface A. fundyense cell concentration maps were applied to gauge the model’s fidelity. The coupled model is capable of reproducing the hydrodynamics and the temporal and spatial distributions of A. fundyense cell concentration reasonably well. Model hindcast solutions were further used to diagnose physical and biological factors controlling the bloom dynamics. Surface wind fields modulated the bloom’s horizontal and vertical distribution. The initial cyst distribution was found to be the dominant factor affecting the severity and the interannual variability of the A. fundyense bloom. Initial cyst abundance for the 2006 bloom was about 50% of that prior to the 2005 bloom. As the result, the time-averaged gulf-wide cell concentration in 2006 was also only about 60% of that in 2005. In addition, weaker alongshore currents and episodic upwelling-favorable winds in 2006 reduced the spatial extent of the bloom as compared with 2005.
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影响因子：
3.2
作者：
Shchepetkin, AF;McWilliams, JC
通讯作者：
McWilliams, JC
影响因子：
3.2
作者：
Marchesiello, Patrick;McWilliams, James C.;Shchepetkin, Alexander
通讯作者：
Shchepetkin, Alexander
影响因子：
3.6
作者：
He, Ruoying;McGillicuddy, Dennis J., Jr.
通讯作者：
McGillicuddy, Dennis J., Jr.
DOI：
10.1016/j.dsr2.2005.09.004
发表时间：
2005-01-01
影响因子：
3
作者：
Anderson, DM;Keafer, BA;Smith, KW
通讯作者：
Smith, KW
DOI：
10.1016/s0967-0645(96)00052-5
发表时间：
1996-01-01
影响因子：
3
作者：
Limeburner, R;Beardsley, RC
通讯作者：
Beardsley, RC