“永冻土解冻和土壤排水对氧化亚氮的排放不会有显著影响”哥本哈根大学Bo Elberling领衔的报导写到。

"Thawing and drainage of the soils had little impact on nitrous oxide production," Nature said in a statement of the study led by Bo Elberling of Copenhagen University.

菲尼克斯放置三个支架的地形相对来说比较平坦，地面上多角形图案看起来好像是由于地下永冻土的扩张和收缩形成的。

The terrain where Phoenix set its three legs is relatively flat with polygon-shaped patterns in the ground likely caused by the expansion and contraction of underground ice.

周日发表的一项研究显示北极永冻土壤解冻可以释放出氧化亚氮，俗称笑气。 这种温室气体对气候变化的贡献一般为世人所忽视。

OSLO (Reuters) - Thawing permafrost can release nitrous oxide, also known as laughing gas, a contributor to climate change that has been largely overlooked in the Arctic, a study showed on Sunday.