Abstract. To mitigate the rumen enteric methane (CH₄) produced by ruminant livestock, Asparagopsis taxiformis is proposed as an additive to ruminant feed. During the cultivation of Asparagopsis taxiformis in the sea or in terrestrial based systems, this macroalgae, like most seaweeds and phytoplankton, produces a large amount of bromoform (CHBr₃), which may contribute to ozone depletion once released into the atmosphere. In this study, the impact of CHBr₃ on the stratospheric ozone layer resulting from potential emissions from proposed Asparagopsis cultivation in Australia is assessed by weighting the emissions of CHBr₃ with the ozone depletion potential (ODP), which is traditionally defined for long-lived halogens but has been also applied to very short lived substances (VSLSs). An annual yield of ~3.5 × 10⁴ Mg dry weight (DW) is required to meet the needs of 50 % of the beef feedlot and dairy cattle in Australia. Our study shows that the intensity and impact of CHBr₃ emissions varies dependent on location and cultivation scenarios. Of the proposed locations, tropical farms near the Darwin region are associated with largest CHBr₃ ODP values. However, farming of Asparagopsis using either ocean or terrestrial cultivation systems at any of the proposed locations does not have potential to impact the ozone layer. Even if all Asparagopsis farming was performed in Darwin, the emitted CHBr₃ would amount to less than 0.016 % of the global ODP-weighted emissions. The remains are relatively small even if the intended annual yield in Darwin is scaled by a factor 30 to meet the global requirements, which will increase the global ODP-weighted emissions by 0.48 %

中文翻译：

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澳大利亚芦笋养殖溴仿对环境的潜在影响

摘要。为了减少反刍家畜产生的瘤胃肠道甲烷 (CH ₄ )，建议将Asparagopsis taxformis作为反刍动物饲料的添加剂。在海洋或陆基系统中培育Asparagopsis taxformis期间，这种大型藻类与大多数海藻和浮游植物一样，会产生大量溴仿 (CHBr ₃ )，一旦释放到大气中，可能会导致臭氧消耗。在这项研究中，CHBr的影响₃从提出潜在的排放导致平流层臭氧层上Asparagopsis在澳大利亚种植通过加权CHBr的排放评估₃臭氧消耗潜能值 (ODP)，传统上定义为长寿命卤素，但也适用于极短寿命物质 (VSLS)。需要~3.5 × 10 ⁴ Mg 干重 (DW)的年产量才能满足澳大利亚 50% 的肉牛饲养场和奶牛的需求。我们的研究表明，CHBr ₃排放的强度和影响因地点和种植场景而异。在提议的地点中，达尔文地区附近的热带农场与最大的 CHBr ₃ ODP 值相关。然而，在任何拟议地点使用海洋或陆地栽培系统种植芦笋都不会影响臭氧层。即使所有的芦笋如果在达尔文进行农业，排放的 CHBr ₃将少于全球 ODP 加权排放量的 0.016%。即使将达尔文的预期年产量按比例增加 30 倍以满足全球要求，剩余物也相对较少，这将使全球 ODP 加权排放量增加 0.48%