Methane in the Columbia River Plume

靠近海岸和大陆架的地区明显更多 与开放的海洋相比， CH4预算由于缺乏数据而忽略了这一事实。 对华盛顿附近海岸地区的调查， 俄勒冈州，特别是受哥伦比亚影响的地区 河流羽流和评价该羽流对 CH4逃逸到大气中的速率将有助于构建 准确的CH4预算。 平均而言，哥伦比亚河下游是超饱和的， 甲烷的120倍。 也有活跃的人口 甲烷氧化细菌的数量 每天消耗20 nM甲烷。 初步 有证据表明，在河口，由于盐度 增加到千分之五以上，这种微生物 活动停止。 这项研究将确定一名海军陆战队员是否 甲烷氧化有机体的种群得以建立 随着哥伦比亚河的羽流向下游移动， 残留的甲烷，或者如果河流供应的甲烷是 完全消失在大气层中。 这项研究与 所有的河流系统，并具有重要意义，目前的尝试， 为海洋开发甲烷预算。

Near shore and continental shelf areas are significantly more supersaturated with CH4 than are the open oceans, yet global CH4 budgets ignore this fact because of the paucity of data. Investigations of the near shore regions of Washington and Oregon, particularly those areas influenced by the Columbia River plume and evaluations of the impact of this plume on the rate of CH4 evasion to the atmosphere will help to construct accurate CH4 budgets. The lower Columbia River is, on average, supersaturaterd with methane by a factor of 120. There is also an active population of methane oxidizing bacteria within the river with an average consumption rate of 20 nM methane per day. Preliminary evidence indicates that within the estuary, as the salinity increases above about 5 parts per thousand, this microbial activity ceases. This study will determine whether a marine population of methane oxidizing organisms becomes established as the Columbia River plume moves downstream and consumes the residual methane or if the riverine supply of methane is completely evaded to the atmosphere. Ths study is relevant to all river systems and is of significance to current attempts to develop a methane budget for the oceans.