Abstract

During January–March 2011, 29 atmospheric Δ¹⁴CO₂ samples were measured along the R/V Xuelong cruise track from Zhongshan Station (69.37°S, 76.38°E; Antarctica) to Shanghai. The extent of fossil fuel contamination in the samples was evaluated by comparison with contemporary hemispheric-scale averages of Δ¹⁴CO₂, together with transport analysis and consideration of the δ¹³CO₂ levels in the samples. Generally, the Δ¹⁴CO₂ levels along the route south to 40.67°S were lower than the hemispheric-scale average. Circumpolar deep water (CDW) upwelling, stratosphere–troposphere transport (STT), and regional transport associated with the Fukushima nuclear power plant (NPP) accident in Japan on 12 March 2011 were found to have influenced Δ¹⁴CO₂ levels at the sampling sites. In comparison with the atmospheric Δ¹⁴CO₂ level (45.7 ± 3.5‰ (1σ)) measured in the coastal region of East Antarctica, CDW upwelling caused reduction of ∼10‰ in Δ¹⁴CO₂ in two cross sections: 62.0°–64.0°S along 74.0°E and 51.7°–54.0°S along 80.5°–84.0°E. Conversely, STT-enhanced Δ¹⁴CO₂ was ∼7‰ (∼3‰) at Zhongshan (around 45.0°S). The linkage was supported by a certain Model-3/CMAQ simulation that indicated dispersion of radionuclides from the Fukushima NPP accident over the East Asian region, which explained the individual high Δ¹⁴CO₂ (52‰) level on 29 March 2011 in Shanghai.

摘要

2011年1月- 3月29大气压Δ期间^14个CO ₂被沿R / V测量样品雪龙至上海;中山站（南极洲69.37°S，76.38。E）巡航轨迹。样品中的化石燃料污染的程度通过用Δ的当代半球尺度的平均值比较来评价¹⁴ CO ₂，与δ的运输分析和考虑一起¹³ CO ₂水平的样品英寸 通常，Δ ¹⁴ CO ₂沿南至40.67°S的路线的水平低于半球平均水平。北极圈的深层水（CDW）上涌，平流层-对流层传输（STT），以及区域交通与福岛核电站（NPP）事故发生在日本2011年12月相关的发现影响了Δ ¹⁴ CO ₂的采样点水平。在与大气Δ比较¹⁴ CO ₂（45.7±3.5‰（1σ））在东南极洲，CDW的沿海区域中测量上升流在Δ减少引起的〜10‰水平¹⁴ CO ₂在两个横截面：62.0°-64.0沿74.0°E的°S和沿80.5°-88.4°E的51.7°-54.0°S。相反地，STT-增强Δ ¹⁴ CO ₂在中山（大约45.0°S），约为7‰（〜3‰）。联动装置是由某些型号-3 / CMAQ仿真支持从福岛NPP事故在东亚区域，其解释了单独的高Δ放射性核素的指示的分散体¹⁴ CO ₂在上海（52‰）的水平上29 2011年3月。