风场对太湖叶绿素a空间分布的影响

叶绿素a的浓度是水环境评价的重要参数。根据2005—2009年太湖全湖32个采样点的20次太湖采样数据,结合气象要素资料模拟的太湖风场,探求了风场对太湖叶绿素a空间分布的影响。结果表明:叶绿素a浓度的高值中心位于太湖西北侧、竺山湾以及梅梁湾流域,而太湖东南部的叶绿素a浓度较低;全太湖全年以东南风为主,南部风速较大,北部风速较弱;风场对叶绿素a的输移作用明显,在风场作用下,叶绿素向太湖西北部和北部输移,造成了该地区太湖流域叶绿素浓度普遍偏高。

Effects of wind field on spatial distribution of chlorophyll-a concentration in Taihu Lake

Chlorophyll-a concentration is an important parameter in assessing water environment. Based on the 20 times investigation data at 32 stations in Taihu Lake in 2005-2009 and the Lake wind fields simulated by meteorological data, this paper explored the effects of the wind fields on the spatial distribution of chlorophyll-a in the Lake. The results showed that the high-value center of chlorophyll-a was in the northwestern Taihu Lake, Zhunshan Bay, and Meiliang Bay, while the lower value was distributed in southeastern Taihu Lake. In whole year, the wind direction was mainly southeast, and the wind was stronger in the south but weaker in the north of the Lake. Wind field had obvious effects on the translocation of chlorophyll-a. Under the action of the wind fields, the chlorophyll-a concentration transported gradually to the northwest and north of Taihu Lake, and accordingly, the chlorophyll-a concentration in these areas was generally higher.