Abstract：
Acadia National Park (ANP) is located on Mt. Desert Island, ME on the U.S. Atlantic coast. ANP is routinely a top-ten most popular National Park with over four million visits in 2022. The overall contribution and negative effects of long-range atmospheric transport and local sources of dioxin-like contaminants endangering natural and wildlife resources is unknown. Dioxin-like (DL) contaminants polychlorinated dibenzo-p-dioxins (∑PCDD) and polychlorinated dibenzofurans (∑PCDF), non-ortho coplanar PCBs (∑CP4), and polychlorinated naphthalenes (∑PCNs) were measured at the McFarland Hill air monitoring station (44.37⁰N, 68.26⁰W). On a mass/volume basis, total PCNs averaged 90.9 % (788 fg/m3) of DL contaminants measured annually, with 92.9 % of the collected total in the vapor-phase. Alternatively, total dioxin/furans (∑PCDD/Fs) represented 71.6 % of the total toxic equivalence (∑TEQ) (1.018 fg-TEQ/m3), with 69.7 % in the particulate-phase. Maximum concentrations measured for individual sampling events for ∑PCDD/F, ∑CP4, and ∑PCN were 159 (winter), 139 (summer), and 2100 (autumn), fg/m3 respectively. Whereas the maximum ∑TEQ concentrations for individual sampling events for ∑PCDD/F, ∑CP4, and ∑PCN were 2.8 (autumn), 0.38 (summer), and 0.71 (autumn), fg-TEQ/m3 respectively. Pearson correlations were calculated for ∑PCDD/Fs and ∑PCN particulate/vapor-phase air concentrations and PM2.5 wood smoke \"indicator\" species. The most significant correlations were observed in autumn for particulate-phase ∑PCDD/Fs suggesting a relationship between visitation-generated combustion sources (campfires and/or waste burning) or climate-change mediated forest fires. Significant Clausius-Clapeyron (C-C) correlations observed for particulate-phase ∑PCDDs (r2 = 0.567) as ambient temperatures decreased suggests a connection between localized domestic heating sources or visitor-based burning of wood/trash resources. Alternatively, highly significant C-C vapor-phase ∑CP4-PCBs correlations (r2 = 0.815) implies that the majority of ∑CP4-PCB loading to ANP is from long-range atmospheric transport processes. Based on these findings, Acadia National Park should be classified as a remote site with minor depositional impacts from ∑PCDD/Fs, ∑CP4-PCBs, and ∑PCN atmospheric transport or local diffuse sources.
摘要：
阿卡迪亚国家公园（ANP）位于Mt.沙漠岛,我在美国大西洋海岸。ANP通常是十大最受欢迎的国家公园，2022年访问量超过400万。远距离大气迁移和二恶英样污染物的本地来源危害自然和野生动植物资源的总体贡献和负面影响尚不清楚。类二恶英（DL）污染物多氯二苯并对二恶英（∑PCDD）和多氯二苯并呋喃（∑PCDF），非正共平面PCB(∑CP4)，和多氯萘(∑PCNs)在麦克法兰希尔空气监测站(44.37ºN，68.26威尔士）。在质量/体积的基础上，总PCN平均每年测量90.9%(788fg/m3)的DL污染物，在气相中收集到的总量的92.9%。或者，总二恶英/呋喃(∑PCDD/Fs)占总毒性当量(∑TEQ)(1.018fg-TEQ/m3)的71.6%，在颗粒相中占69.7%。针对∑PCDD/F的单个采样事件测得的最大浓度，∑CP4和∑PCN分别为159(冬季)，139（夏季），2100年（秋季），fg/m3。而对于∑PCDD/F，单个采样事件的最大∑TEQ浓度，∑CP4和∑PCN分别为2.8（秋季），0.38（夏季），和0.71（秋季），fg-TEQ/m3。计算了∑PCDD/Fs和∑PCN颗粒/气相空气浓度和PM2.5木材烟雾“指标”物种的Pearson相关性。在秋季，颗粒相∑PCDD/Fs观察到了最显着的相关性，表明探视产生的燃烧源（篝火和/或废物燃烧）或气候变化介导的森林火灾之间存在关系。随着环境温度的降低，在颗粒相∑PCDD（r2=0.567）中观察到的克劳修斯-克拉皮龙（C-C）相关性显着，表明本地家庭热源或访客燃烧木材/垃圾资源之间存在联系。或者，非常显着的C-C气相∑CP4-PCB相关性（r2=0.815）意味着大部分∑CP4-PCB负载到ANP来自远距离大气传输过程。基于这些发现,阿卡迪亚国家公园应被归类为一个偏远的地点，其沉积影响较小，来自∑PCDD/Fs。∑CP4-PCB,和∑PCN大气传输或局部扩散源。
