Radon 222 excess measured on water bottle samples during HEINCKE cruise HE153

In the years 2000 and 2001 we measured methane concentrations exceeding up to two orders of magnitude the equilibrium with the atmosphere in the water column on the SW-Spitsbergen continental shelf. This methane anomaly extended from its centre on the shelf westwards over the upper slope and eastwards well into the inner basins of the two southernmost Spitsbergen fjords, the Hornsundfjord and the van Mijenfjord. Methane concentrations and stable carbon isotopic ratios varied between 2 and 240 nM, and between -53 per mill and -20 per mill VPDB, respectively. Methane in high concentrations was depleted in 13C whereas in low concentrations d13CCH4 values were highly variable. […]

在2000年和2001年间，我们对斯匹次卑尔根西南大陆架水柱中的甲烷浓度进行了测量，其浓度超过大气平衡值的两个数量级。这一甲烷异常现象从大陆架中心的甲烷浓度峰值向西延伸至上部斜坡，并向东深入至最南端两个斯匹次卑尔根峡湾——霍恩斯文德峡湾和范米延峡湾的内部盆地。甲烷浓度和稳定的碳同位素比值介于2至240纳摩尔之间，以及分别介于每毫升-53至-20之间（以VPDB为标准）。高浓度甲烷的13C含量较低，而低浓度甲烷的d13CCH4值则表现出高度的不确定性。...