The North Atlantic Ocean as a source of atmospheric N2O
The North Atlantic Ocean as a source of atmospheric N2O
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DOI：
10.1111/j.2153-3490.1974.tb01962.x
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发表时间：
1974-02
期刊：
影响因子：
--
通讯作者：
J. Hahn
中科院分区：
文献类型：
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作者：
J. Hahn
1969年、1970年和1971年，在北大西洋的3次巡航中进行了海水N2 O的测量.在几个监测站从海面和水深3000米处采集了水样。在热带-亚热带纬度的地表水浓度平均为0.5？每升海水中含氮量为100克.在38.5° N ~ 48.5° N范围内，平均0.4？每升海水中发现了1.5g N2 O。在冰岛-法罗海脊地区，地表水浓度平均为0.4？当水温为10°C时，每升海水中的N2 O含量为0.5g;当水温为5°C时，每升海水中的N2 O含量为1.5g。垂直N2 O浓度分布通常表现出两个极大值：一个较小的极大值在100和200 m之间，一个较大的极大值在400和1000 m之间，N2 O浓度最高可达0.8？g/升海水。除少数样本外，测量结果表明北大西洋海水中的N2 O过饱和。从热带-副热带纬度到48.5° N，上层海水的过饱和度超过100%。再往北，海水的N2 O过饱和度降低。对于1000米以下的上层海水，从垂直剖面图中获得了以下平均值：在热带纬度约为66%的过饱和度，在亚热带纬度约为47%，在38.5° N至48.5° N范围内约为42%，在冰岛-法罗海脊地区约为12-20%的过饱和度。人们可以得出这样的结论：北大西洋是大气中N2 O的净来源.很可能其他海洋也有同样的能力。DOI：10.1111/j.2153-3490.1974.tb01962.x
In 1969, 1970, and 1971 N 2 O measurements of sea water were carried out during 3 cruises in the open North Atlantic ocean. Water samples were taken from the sea's surface and from depths down to 3000 m at several stations. Surface water concentrations in the tropical-subtropical latitudes averaged 0.5 ?g N 2 O per liter sea water. For the range from 38.5° N to 48.5° N, an average of 0.4 ?g N 2 O per liter sea water was found. In the area of the Iceland—Faroe ridge, the surface water concentrations averaged 0.4 ?g N 2 O per liter' sea water when water temperatures were 10°C, and 0.5 ?g N 2 O per liter sea water when water temperatures were 5°C. The vertical N 2 O concentration profiles often show two maxima: a smaller one between 100 and 200 m and a large one between 400 and 1000 m with N 2 O concentrations up to 0.8 ?g per liter sea water. With the exception of a few samples, the measurements indicated that the North Atlantic sea water is supersaturated with N 2 O. Supersaturation values up to more than 100% were found in the upper layers of the sea water from the tropical-subtropical latitudes up to 48.5° N. Further north the N2O supersaturation of the sea water decreases. For the upper sea water layers down to 1000 m the following average values were obtained from vertical profiles: in tropical latitudes about 66% super-saturation, in subtropical latitudes about 47%, in the range from 38.5° N to 48.5° N about 42%, and in the area of the Iceland—Faroe ridge about 12–20% supersaturation. One may conclude that the North Atlantic ocean acts as a net source of atmospheric N 2 O. It is probable that the other oceans have the same ability. DOI: 10.1111/j.2153-3490.1974.tb01962.x