Latitudinal distributions of organic nitrogen and organic carbon in marine aerosols over the western North Pacific
Latitudinal distributions of organic nitrogen and organic carbon in marine aerosols over the western North Pacific
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DOI：
10.5194/acp-11-3037-2011
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发表时间：
2011-01-01
影响因子：
6.3
通讯作者：
Uematsu, M.
中科院分区：
文献类型：
--
作者：
Miyazaki, Y.;Kawamura, K.;Uematsu, M.
2008年夏末，在北太平洋西部沿着北纬44 ° ~ 10 °的样带上采集了海洋气溶胶样品，测定了有机氮（ON）和有机碳（OC）以及总氮（TN）和总碳（TC）的同位素比值。在北纬40-44度和亚热带地区（北纬10-20度）甲烷磺酸（MSA）和二乙基铵（DEA（+））浓度的增加以及平均卫星叶绿素a数据和5天的返回轨迹表明，海洋生物活动对这些地区的气溶胶有重大影响。在这些受海洋生物影响的气溶胶中，ON的浓度增加至260 ngN m（-3）。水不溶性有机氮（WION）被认为是气溶胶中最丰富的氮，占总气溶胶氮的55 +/- 16%。特别地，在40-14度N时，平均WION/ON比高达0.93 +/-0.07。这些结果表明，海洋生物源显着贡献ON，其中大部分是由水不溶性馏分在研究区域。稳定碳同位素比（delta C-13）分析表明，平均而言，海洋来源的碳占气溶胶总碳的88 +/- 12%。此外，在海洋生物影响的气溶胶中，当ON/OC比值从0.15增加到0.35时，Δ C-13显示出更高的值（从-22至20 ‰）。这些结果清楚地表明，有机氮富集在有机气溶胶起源于一个海洋区域具有高的生物生产力，表明含氮有机化合物从海洋表面到海洋大气的优先转移。两个WION浓度和WION/水不溶性有机碳（WIOC）的比例往往会随着当地风速的增加而增加，这表明通过海上喷雾的海洋到空中的ON排放对研究区域的海洋有机气溶胶有显着的贡献。
Marine aerosol samples were collected over the western North Pacific along the latitudinal transect from 44 degrees N to 10 degrees N in late summer 2008 for measurements of organic nitrogen (ON) and organic carbon (OC) as well as isotopic ratios of total nitrogen (TN) and total carbon (TC). Increased concentrations of methanesulfonic acid (MSA) and diethylammonium (DEA(+)) at 40-44 degrees N and subtropical regions (10-20 degrees N) together with averaged satellite chlorophyll-a data and 5-day back trajectories suggest a significant influence of marine biological activities on aerosols in these regions. ON exhibited increased concentrations up to 260 ngN m(-3) in these marine biologically influenced aerosols. Water-insoluble organic nitrogen (WION) was found to be the most abundant nitrogen in the aerosols, accounting for 55 +/- 16% of total aerosol nitrogen. In particular, the average WION/ON ratio was as high as 0.93 +/- 0.07 at 40-14 degrees N. These results suggest that marine biological sources significantly contributed to ON, a majority of which is composed of water-insoluble fractions in the study region. Analysis of the stable carbon isotopic ratios (delta C-13) indicated that, on average, marine-derived carbon accounted for similar to 88 +/- 12% of total carbon in the aerosols. In addition, the delta C-13 showed higher values (from -22 to 20 parts per thousand) when ON/OC ratios increased from 0.15 to 0.35 in marine biologically influenced aerosols. These results clearly show that organic nitrogen is enriched in organic aerosols originated from an oceanic region with high biological productivity, indicating a preferential transfer of nitrogen-containing organic compounds from the sea surface to the marine atmosphere. Both WION concentrations and WION/water-insoluble organic carbon (WIOC) ratios tended to increase with increasing local wind speeds, indicating that sea-to-air emissions of ON via sea spray contribute significantly to the marine organic aerosols over the study region.