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Potential environmental impact of bromoform from Asparagopsis farming in Australia
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2022-06-14 , DOI: 10.5194/acp-22-7631-2022 Yue Jia , Birgit Quack , Robert D. Kinley , Ignacio Pisso , Susann Tegtmeier
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2022-06-14 , DOI: 10.5194/acp-22-7631-2022 Yue Jia , Birgit Quack , Robert D. Kinley , Ignacio Pisso , Susann Tegtmeier
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 terrestrially based systems, this macroalgae,
like most seaweeds and phytoplankton, produces a large amount of bromoform
(CHBr3), which contributes to ozone depletion once released into the
atmosphere. In this study, we focus on the impact of CHBr3 on the
stratospheric ozone layer resulting from potential emissions from proposed
Asparagopsis cultivation in Australia. The impact is assessed by weighting the emissions
of CHBr3 with its ozone depletion potential (ODP), which is
traditionally defined for long-lived halocarbons but has also been applied
to very short-lived substances (VSLSs). An annual yield of ∼3.5 × 104 Mg dry weight 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 vary, depending on location
and cultivation scenarios. Of the proposed locations, tropical farms near
the Darwin region are associated with the largest CHBr3 ODP values.
However, farming of Asparagopsis using either ocean or terrestrial
cultivation systems at any of the proposed locations does not have the potential
to significantly impact the ozone layer. Even if all Asparagopsis farming were performed
in Darwin, the CHBr3 emitted into the atmosphere would amount to less
than 0.02 % of the global ODP-weighted emissions. The impact of remaining
farming scenarios is also relatively small even if the intended annual yield
in Darwin is scaled by a factor of 30 to meet the global requirements, which
will increase the global ODP-weighted emissions up to ∼0.5 %.
中文翻译:
澳大利亚芦笋养殖中溴仿的潜在环境影响
为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。在海中或陆基系统中培养滑行天门冬期间,这种大型藻类与大多数海藻和浮游植物一样,会产生大量的溴仿 (CHBr 3 ),一旦释放到大气中就会导致臭氧消耗。在这项研究中,我们关注 CHBr 3对平流层臭氧层的影响,这是由于澳大利亚拟建 的天门冬种植的潜在排放造成的。通过加权 CHBr 3的排放量来评估影响臭氧消耗潜能值 (ODP),传统上定义为长寿命卤化碳,但也适用于寿命极短的物质 (VSLS)。 为满足澳大利亚 50% 的肉牛饲养场和奶牛的需求,需要∼3.5 × 10 4 Mg 干重的年产量。我们的研究表明,CHBr 3排放的强度和影响因地点和种植情况而异。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,种植芦笋在任何拟议地点使用海洋或陆地耕作系统都不会对臭氧层产生重大影响。即使在达尔文进行所有天门冬养殖,排放到大气中的 CHBr 3也将不到全球 ODP 加权排放量的 0.02%。即使达尔文的预期年产量增加 30 倍以满足全球需求,其余农业情景的影响也相对较小,这将使全球 ODP 加权排放量增加至∼0.5 %。
更新日期:2022-06-15
中文翻译:
澳大利亚芦笋养殖中溴仿的潜在环境影响
为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。在海中或陆基系统中培养滑行天门冬期间,这种大型藻类与大多数海藻和浮游植物一样,会产生大量的溴仿 (CHBr 3 ),一旦释放到大气中就会导致臭氧消耗。在这项研究中,我们关注 CHBr 3对平流层臭氧层的影响,这是由于澳大利亚拟建 的天门冬种植的潜在排放造成的。通过加权 CHBr 3的排放量来评估影响臭氧消耗潜能值 (ODP),传统上定义为长寿命卤化碳,但也适用于寿命极短的物质 (VSLS)。 为满足澳大利亚 50% 的肉牛饲养场和奶牛的需求,需要∼3.5 × 10 4 Mg 干重的年产量。我们的研究表明,CHBr 3排放的强度和影响因地点和种植情况而异。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,种植芦笋在任何拟议地点使用海洋或陆地耕作系统都不会对臭氧层产生重大影响。即使在达尔文进行所有天门冬养殖,排放到大气中的 CHBr 3也将不到全球 ODP 加权排放量的 0.02%。即使达尔文的预期年产量增加 30 倍以满足全球需求,其余农业情景的影响也相对较小,这将使全球 ODP 加权排放量增加至∼0.5 %。