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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >DIMETHYL SULFIDE, METHANE SULFONIC ACID AND PHYSICOCHEMICAL AEROSOL PROPERTIES IN ATLANTIC AIR FROM THE UNITED KINGDOM TO HALLEY BAY
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DIMETHYL SULFIDE, METHANE SULFONIC ACID AND PHYSICOCHEMICAL AEROSOL PROPERTIES IN ATLANTIC AIR FROM THE UNITED KINGDOM TO HALLEY BAY

机译：从英国到哈利湾的二甲基硫醚，亚磺酸磺酸盐和理化气溶胶性质在大西洋中

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The concentrations of dimethyl sulfide in air were obtained during a cruise between the United Kingdom and the Antarctic in the period October 1992 to January 1993 using a method of sampling and analysis optimized to avoid interferences from oxidants. In equatorial regions (30 degrees N to 30 degrees S) the atmospheric DMS concentration ranged from 3 to 46 ng (S) m(-3), with an average of 18 ng (S) m(-3). In the polar waters and regions south of the Falkland Islands, concentrations from 3 to 714 ng (S) m(-3) were observed, with a mean concentration of 73 ng (S) m(-3). The concentrations of a range of DMS oxidation products were also obtained. No clear relationships between reactant and product concentrations were seen. Information on particle number concentration, Fuchs surface area and the thermal volatility characteristics of the ambient aerosol was obtained, but again no clear relationships with sulfur concentrations were observed. Accumulation mode particle concentrations averaged 25 cm(-3) in the clean marine and polar air masses south of 58 degrees S while background condensation nuclei (CN) concentrations were of the order of 400-600 cm(-3). Simplistic calculations suggest that a particle source strength of about 20-60 particles cm(-3) d(-1) is required to sustain this background CN concentration. It is not clear whether boundary layer nucleation of new CN or entrainment from the free troposphere provided the source of CN. Periods of elevated CN concentrations (>4000 cm(-3)) were regularly observed in the boundary layer over the Weddell Sea and were attributed to ''bursts'' of new particle formation. However, shortly after these nucleation events the CN concentration rapidly decayed to the background level through coagulation losses, suggesting little impact on die background CN or cloud condensation nuclei (CCN) concentration. [References: 58]
机译：1992年10月至1993年1月，在英国和南极之间的航行中，采用了优化的采样和分析方法以避免氧化剂的干扰，获得了空气中二甲基硫的浓度。在赤道地区（北纬30度至南纬30度），大气DMS浓度范围为3至46 ng（S）m（-3），平均为18 ng（S）m（-3）。在福克兰群岛以南的极地水域和南部地区，观察到的浓度为3至714 ng（S）m（-3），平均浓度为73 ng（S）m（-3）。还获得了一系列DMS氧化产物的浓度。在反应物和产物浓度之间没有清楚的关系。获得了有关粒子数浓度，Fuchs表面积和环境气溶胶热挥发性特征的信息，但仍未观察到与硫浓度的明确关系。在南纬58度以南的清洁海洋和极地气团中，积累模式的颗粒浓度平均为25 cm（-3），而背景凝结核（CN）的浓度约为400-600 cm（-3）。简单的计算表明，需要约20-60个粒子cm（-3）d（-1）的粒子源强度来维持此背景CN浓度。尚不清楚新CN的边界层成核或来自自由对流层的夹带提供CN的来源。定期在韦德尔海边界层观察到CN浓度升高的时期（> 4000 cm（-3）），这归因于新颗粒形成的“爆发”。但是，在这些成核事件发生后不久，CN浓度通过凝结损失迅速降至背景水平，表明对背景CN或云凝结核（CCN）浓度的影响很小。 [参考：58]

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