Source apportionment of black carbon aerosols by isotopes (14C and 13C) and Bayesian modeling from two remote islands in east Asian outflow region

被引：2

作者：

Uchida, Masao ^{[1
,10
]}

Mantoku, Kanako ^{[1
]}

Kumata, Hidetoshi ^{[2
]}

Kaneyasu, Naoki ^{[3
,4
]}

Handa, Daishi ^{[5
]}

Arakaki, Takemitsu ^{[5
]}

Kobayashi, Toshiyuki ^{[1
]}

Hatakeyama, Shiro ^{[6
]}

Shibata, Yasuyuki ^{[1
,7
]}

Kawamura, Kimitaka ^{[8
,9
]}

机构：

[1] Natl Inst Environm Studies, NIES TERRA AMS Facil, Tsukuba 3050053, Japan

[2] Tokyo Univ Pharm & Life Sci, Hachioji 3344454, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba 3058569, Japan

[4] Fukushima Inst Res Educ & Innovat, Namie 9791521, Japan

[5] Univ Ryukyus, Nishihara, Okinawa 9030213, Japan

[6] Asia Ctr Air Pollut Res, Niigata 9502144, Japan

[7] Tokyo Univ Sci, Tokyo 1628601, Japan

[8] Hokkaido Univ, Sapporo 0600819, Japan

[9] Chubu Univ, Kasugai 4878501, Japan

[10] 16-2 Onogawa, Tsukuba 3050053, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2023年 / 538卷

基金：

日本学术振兴会;

关键词：

Black carbon; PM2; 5; Radiocarbon; Cape Hedo; Okinawa island; Fukue island; East Asia; Asian outflow; Source apportionment; FUKUE ISLAND; AIR-POLLUTION; C-14; ANALYSIS; FOSSIL; IMPACT; FIRES; JAPAN; AMS;

D O I：

10.1016/j.nimb.2023.02.002

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We report the results of source apportionment of combustion-derived black carbon (BC), in PM2.5 aerosols collected from the East Asian continental outflow region at two islands; Okinawa and Fukue during the period from October 2009 to May 2010. The 14C contents of BC from Okinawa (Cape Hedo) and Fukue islands (Fukue) varied from 24.4 to 34.2 pMC and from 18.1 to 43.0 pMC, respectively. Source apportionment of BC was con-ducted by using a simple 14C mass balance model and a dual-isotope Bayesian Markov chain Monte Carlo model. Biomass combustion contributions (e.g., wood fuel and crop residues) were 23-31 % (mean 27 +/- 3 %) at Cape Hedo and 15-38 % (mean 27 +/- 12 %) at Fukue. Both sites were equally affected by biomass combustion, whose levels are similar to those observed in the hotspot regions (megacities) in China. Fossil fuel contributions (e.g., oil, gasoline, and diesel) were 69-77 % (mean 74 +/- 3 %) with 2-69 % from coal and 3-76 % from liquid fossil at Cape Hedo, and 55-85 % (mean 73 +/- 12 %) at Fukue with 3 % from coal and 53-56 % from liquid fuel for the early winter. Those variations for both sites showed significantly different source region-specific trends and this trend was also consistent with the results of the air mass trajectory analysis with a higher contribution of coal-BC from North China including Beijing, and East China including Shanghai. In spring, we found a higher contri-bution of liquid fossil fuel combustion (e.g., traffic) over the East China Sea, including Pacific air masses, sug-gesting that the possible contribution of ship emissions was relatively high. Although our results for isotopes-based source apportionment of BC are preliminary, these findings suggest that long-term monitoring of BC aerosols, even in remote sites of Asian outflows, and source-specific descriptions of BC are important to improve climate models. We also recommend further measurements for implementing regionally tailored mitigation.

引用

页码：64 / 74

页数：11