Changes in the Bathymetry and Volume of Glacial Lake Agassiz Between 11,000 and 9300 14C yr B.P.
Changes in the Bathymetry and Volume of Glacial Lake Agassiz Between 11,000 and 9300 14C yr B.P.
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DOI：
10.1006/qres.2000.2157
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发表时间：
2000-09
影响因子：
2.3
通讯作者：
D. Leverington;J. Mann;J. Teller
中科院分区：
文献类型：
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作者：
D. Leverington;J. Mann;J. Teller
在其4000年的历史中，阿加西冰川湖的体积和表面积变化很大。阿加西斯湖七个阶段的计算机模型被用来量化该湖早期历史上约11,000至9,300 14C年B.P.(约13,000至10,300卡尔年B.P.)的变化。赫尔曼海岸线(约11000个14C年B.P.)刚形成，阿加西兹湖的水量似乎就减少了85%，这是因为溢流突然改变路线，从向南进入密西西比河流域的路线流向其东部出口。这个排水系统通过五大湖和圣劳伦斯湾向北大西洋排放了大约9500千米的水。随着这条向东的溢流路线的关闭，这个湖的面积达到了最大，面积为260,000平方公里，体积为22,700平方公里。在那之后不久发生了第二次重大的水量减少，在向东进入五大湖的Kaiashk出口开放后，水量减少了10%，2500-7000千米3的水被释放到北大西洋。这些排放可能影响了大洋环流和北大西洋深水生产。
The volume and surface area of glacial Lake Agassiz varied considerably during its 4000-year history. Computer models for seven stages of Lake Agassiz were used to quantify these variations over the lake's early history, between about 11,000 and 9300 14C yr B.P. (ca. 13,000 to 10,300 cal yr B.P.). Just after formation of the Herman strandlines (ca. 11,000 14C yr B.P.), the volume of Lake Agassiz appears to have decreased by >85% as a consequence of the abrupt rerouting of overflow to its eastern outlet from its southward routing into the Mississippi River basin. This drainage released about 9500 km3 of water into the North Atlantic Ocean via the Great Lakes and Gulf of St. Lawrence. Following closure of this eastern routing of overflow, the lake reached its maximum size at about 9400 14C yr B.P. with an area of >260,000 km2 and a volume of >22,700 km3. A second major reduction in volume occurred shortly after that, when its volume decreased >10% following the opening of the Kaiashk outlet to the east into the Great Lakes, and 2500–7000 km3 of water was released into the North Atlantic Ocean. These discharges may have affected ocean circulation and North Atlantic Deep Water production.