Using the nitrogen chemical tracer N₂* (an anomaly of [N₂] in terms of the saturation ratio of dissolved nitrogen gas to dissolved argon gas in seawater), we quantitatively investigated the processes that affect the flux of oceanic nitrogen gas at the air-sea interface in the subarctic region of the Sea of Okhotsk (OK) and the North Pacific Ocean (NP): denitrification, air injection, and rapid cooling, in five regions, (i) the inflow region from NP into OK, (ii) the continental shelf region, (iii) the continental slope region, (iv) the Okhotsk Sea pelagic ocean region and (v) the outflow region from OK to NP following the flow of seawater from upstream to downstream. In the inflow region, half of ∼1 μmol kg⁻¹ of N₂* amount was due to the denitrification effect, followed by 40% due to the rapid cooling effect, and the remaining about 10% was due to the air injection effect. On the continental shelf, N₂* showed a maximum value of ∼8 μmol kg⁻¹, of which about 56% was the rapid cooling effect, followed by the denitrification effect of 44%, which resulted from the formation of the dense shelf water (DSW) and the active biological production on the continental shelf. On the continental slope, the denitrification effect accounted for three-fourths of N₂*, and the remaining one-fourth was due to the rapid cooling effect, which is due to the mixing of DSW with the surrounding seawater and the active denitrification at a wide depth on the continental slope. In the pelagic ocean region, the N₂* content was the lowest in OK and the fraction of the three effects are almost the same as on the continental slope, which is related to the process of DSW incorporation into the Okhotsk Sea Intermediate Water. In the outflow region from OK to NP, which is downstream of the above regions, the N₂* content steeply decreased by 60% compared to the Okhotsk Sea pelagic ocean region due to tidal mixing in the Bussol Strait. The above quantitative analysis of these five regions showed that the Kruzenshtern Strait, the Bussol’ Strait and the continental shelf and slope of OK play an important role in controlling the three effects affecting the flux of ocean nitrogen gas in OK and NP.

使用氮化学示踪剂 N ₂ *（就海水中溶解氮气与溶解氩气的饱和比而言[N ₂ ]的异常），我们定量研究了影响海洋氮气在空气中通量的过程-鄂霍次克海 (OK) 和北太平洋 (NP) 亚北极地区的海界面：反硝化、空气注入和快速冷却，五个区域，(i) 从 NP 流入 OK 的区域，(ii) ) 大陆架区，(iii) 大陆坡区，(iv) 鄂霍次克海远洋区，以及 (v) 随着海水从上游流向下游，从 OK 到 NP 的流出区。在流入区，~1 μmol kg ^-1 N _{2 的}一半* 量是由于反硝化作用，其次是 40% 是由于快速冷却作用，其余约 10% 是由于空气喷射作用。在大陆架上，N ₂ * 的最大值为~8 μmol kg ^-1，其中约56%为急冷效应，其次是44%的反硝化效应，这是由于形成稠密的陆架水所致(DSW) 和大陆架上的活跃生物生产。在大陆坡上，反硝化作用占N ₂的四分之三*，剩下的四分之一是由于快速冷却效应，这是由于DSW与周围海水的混合以及大陆坡上较宽深度的活跃反硝化作用。在远洋区，OK的N ₂ * 含量最低，三种效应的比例与大陆坡几乎相同，这与DSW并入鄂霍次克海中间水的过程有关。在从 OK 到 NP 的流出区，即上述区域的下游，N ₂* 由于布索尔海峡的潮汐混合，与鄂霍次克海的远洋海域相比，含量急剧下降了 60%。以上对这五个区域的定量分析表明，克鲁岑施腾海峡、布索尔海峡以及OK大陆架和斜坡在控制OK和NP影响海洋氮气通量的三种效应方面发挥了重要作用。