Diffusive methane burst during a blue tide, wind-driven event in a meromictic lake
Diffusive methane burst during a blue tide, wind-driven event in a meromictic lake
复制标题
半积云湖中的蓝潮、风驱动事件期间扩散甲烷爆发
DOI：
10.1016/j.marpolbul.2022.113792
复制
发表时间：
2022
影响因子：
5.8
通讯作者：
Maruya Yasuyuki
中科院分区：
文献类型：
--
作者：
Sasaki Masafumi;Nakayama Keisuke;Maruya Yasuyuki
网走湖是日本亚北极地区北海道的一个典型的半混合湖，在该湖中形成了强烈的分层。当下层的缺氧水被强风涌上水面时，鱼类和蚬由于缺乏溶解氧而死亡。这种现象被称为蓝潮。2008年发生蓝潮后，湖水中溶解甲烷含量下降了100 t以上。这是发现了由于溶解有甲烷的缺氧水上升而导致大量甲烷扩散到大气中的现象。我们将这一事件命名为“甲烷爆发”。这也是第一个报告，风驱动的上升流再现使用数值分析程序和分析的甲烷爆发。在这次蓝色潮汐期间，甲烷通量大约是平时的170倍。
Strong stratification has formed in Lake Abashiri, a typical meromictic lake in Hokkaido, in the subarctic zone in Japan. When the anoxic water of the lower layer is upwelled to the surface by a strong wind, fish and corbicula clams die due to a lack of dissolved oxygen. This event is called as blue tide. It was observed that the dissolved methane in the lake decreased more than 100 t after the blue tide which occurred in 2008. This is the discovery of the phenomenon that a large quantity of methane diffuses to the atmosphere caused by upwelling of anoxic water which contains dissolved methane. We named the event as “methane burst”. It is also the first report that the wind-driven upwelling is reproduced using a numerical analysis code and the methane burst is analyzed. During this blue tide, the methane flux was approximately 170 times greater than usual.