We present a high-resolution spatial study of ocean surface carbon dioxide partial pressure (pCO2), temperature and salinity coupled with a seismic survey performed in subpolar waters with a variable presence of glaciers along the coastal margins of Admiralty Bay and the Bransfield Strait, northern Antarctic Peninsula, during the late spring season. Three zones were identified in this bay. The shallow and relatively fresh SHALLOW GLACIER THAW zone in the inner portion of the bay had high freshwater inputs from active glacial meltwater channels, representing higher pCO2 levels (median ~438 μatm) than the shallow and relatively salty SHALLOW zone without glaciers along the margins and dominated by macroalgae communities at the bottom, which showed relatively low pCO2 levels (median ~371 μatm). The deep and relatively salty CENTRE zone was highly influenced by seawater intrusions from the Bransfield Strait, representing intermediate pCO2 levels (median ~397 μatm). The net sea-air CO2 fluxes in late spring obtained from the high-resolution surface survey in Admiralty Bay indicate a condition of near neutral air-sea CO2 flux, with a median (25–75% interquartile range) value of -0.07 mmol m-2 day-1 (ranging from -12.21 to +4.33 mmol m-2 day-1), contrasting with the slight source to the atmosphere estimated from measurements only in the CENTRE zone. This finding suggests that temperature-sensitive metabolic and physical-chemical processes may cause significant variability in the ocean surface distribution of CO2 over short shoreline distances in the northern Antarctic Peninsula.

中文翻译：

---

晚春南大洋沿岸 pCO2 高分辨率空间分布

我们提出了海洋表面二氧化碳分压的高分辨率空间研究（p一氧化碳2)、温度和盐度以及在春末季节在亚极地水域进行的地震调查，在金钟湾和南极半岛北部布兰斯菲尔德海峡的沿海边缘存在不同的冰川。在这个海湾中确定了三个区域。海湾内部较浅且相对新鲜的 SHALLOW GLACIER THAW 区有来自活跃冰川融水通道的大量淡水输入，代表较高的p一氧化碳2水平（中位数~438 μatm）比浅层和相对咸度的 SHALLOW 带边缘没有冰川，底部以大型藻类群落为主，显示相对较低p一氧化碳2水平（中位数~371 μatm）。较深且相对含盐的 CENTER 带受布兰斯菲尔德海峡海水入侵的影响较大，代表中间p一氧化碳2水平（中位数~397 μatm）。净海气CO2从金钟湾高分辨率地表测量中获得的晚春通量表明近中性的海气 CO2 条件2通量，中位数（25-75% 四分位距）值为 -0.07 mmol m-2日-1（范围从 -12.21 到 +4.33 mmol m-2日-1)，与仅在中心区域的测量估计的大气轻微源形成对比。这一发现表明，温度敏感的代谢和物理化学过程可能会导致海洋表面二氧化碳分布的显着变化2在南极半岛北部的短海岸线上。