pstrongAbstract./strong In September 2013, we observed an expanse of surface water with low COsub2/sub partial pressure (ip/iCOsub2/subsupsea/sup) (&span class="thinspace"/span200span class="thinspace"/span?μatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of COsub2/sub in this region was the result of massive primary production after the sea-ice retreat in June and July. In the surface of the Canada Basin, salinity was low (&span class="thinspace"/span27) and ip/iCOsub2/subsupsea/sup was closer to the aira??sea COsub2/sub equilibrium (a??a??span class="thinspace"/span360span class="thinspace"/span?μatm). From the relationships between salinity and total alkalinity, we confirmed that the low salinity in the Canada Basin was due to the larger fraction of meltwater input (a??a??span class="thinspace"/span0.16) rather than the riverine discharge (a??a??span class="thinspace"/span0.1). Such an increase in ip/iCOsub2/subsupsea/sup was not so clear in the coastal region near Point Barrow, where the fraction of riverine discharge was larger than that of sea-ice melt. We also identified low ip/iCOsub2/subsupsea/sup (&span class="thinspace"/span250span class="thinspace"/span?μatm) in the depth of 30a??50span class="thinspace"/spanm under the halocline of the Canada Basin. This subsurface low ip/iCOsub2/subsupsea/sup was attributed to the advection of Pacific-origin water, in which dissolved inorganic carbon is relatively low, through the Chukchi Sea where net primary production is high. Oxygen supersaturation (&span class="thinspace"/span20span class="thinspace"/span?μmolspan class="thinspace"/spankgsupa??1/sup) in the subsurface low ip/iCOsub2/subsupsea/sup layer in the Canada Basin indicated significant net primary production undersea and/or in preformed condition. If these low ip/iCOsub2/subsupsea/sup layers surface by wind mixing, they will act as additional COsub2/sub sinks; however, this is unlikely because intensification of stratification by sea-ice melt inhibits mixing across the halocline./p.
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机译：> >摘要。2013年9月，我们观察到地表水呈低CO 2 分压（ p CO 2 sea ）（＆ class =“ thinspace”> 200 class =“ thinspace”> ？μatm）在楚科奇海北冰洋西部。该地区CO 2 的大幅欠饱和是6月和7月海冰撤退后大规模初级生产的结果。在加拿大盆地的表面，盐度很低（ span class =“ thinspace”> 27）， p CO 2 海更接近aira ?? sea CO 2 平衡（a ?? a ?? class =“ thinspace”> 360 class =“ thinspace”> ？μatm）。从盐度和总碱度之间的关系，我们确认了加拿大盆地的低盐度是由于较大比例的熔体水输入（a ?? a ?? class =“ thinspace”> 0.16）而不是比河水排放量（a ?? a ?? class =“ thinspace”> 0.1）大。在鲍罗角附近的沿海地区， p CO 2 sea 的这种增加并不太明显，那里的河水排放量大于海冰融化。我们还确定了 p CO 2 sea （＆ class =“ thinspace”> 250 class =“在加拿大盆地盐湖下30a？50 class =“ thinspace”> m的深度中的“ thinspace“> ？μatm）。地下 p CO 2 sea 的这种低水平归因于太平洋原水的平流，其中溶解的无机碳相对较低，通过净初级生产力高的楚科奇海。氧气过饱和（＆ class =“ thinspace”> 20 class =“ thinspace”> ？μmol class =“ thinspace”> kg a？加拿大盆地地下 p CO 2 sea 层中的？1 ）表明海底和/或处于预成型状态。如果这些低 p CO 2 sea 层通过风混合而浮出水面，它们将充当额外的CO 2 汇;但是，这不太可能发生，因为海冰融化层化的加剧会抑制整个卤代烃的混合。。
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