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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >ESTIMATION OF SEASONAL DIMETHYL SULPHIDE FLUXES OVER THE NORTH ATLANTIC OCEAN AND THEIR CONTRIBUTION TO EUROPEAN POLLUTION LEVELS
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ESTIMATION OF SEASONAL DIMETHYL SULPHIDE FLUXES OVER THE NORTH ATLANTIC OCEAN AND THEIR CONTRIBUTION TO EUROPEAN POLLUTION LEVELS

机译：大西洋北半球季节性二甲硫通量的估算及其对欧洲污染水平的贡献

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摘要

A monthly resolved emission budget which aims to reproduce the observed seasonal variations of dimethyl sulphide (DMS) production over the oceans is derived for the North Atlantic Ocean. The monthly cycle of DMS concentrations in seawater and their distribution over the North Atlantic Ocean was determined from a collation of available field measurements. DMS fluxes are calculated on the basis of Liss and Merlivat's (1986) formulation of sea-to-atmosphere gas exchange, using six-hourly meteorological data from the European Center for Medium-Range Forecasts for the year 1988. This allows to show the influence of meteorological conditions on the DMS fluxes to the atmosphere. Results show averaged fluxes over the North Atlantic Ocean in the range 39-390 mu g S m(-2) d(-1), with a monthly summer maximum between 67 and 1260 mu g S m(-2) d(-1), about 20 times larger than the winter minimum. The contribution of natural oceanic sulphur to the acidic deposition levels over Europe is evaluated with the help of a three-dimensional Eulerian dispersion model and is compared to the separate contributions of European and North American anthropogenic sources. The relative contribution of biogenic sulphur to total sulphur deposition over the west coast of Europe does not exceed 2% on a yearly basis although it can be close to 10% during the summer months. Considering the uncertainty ranges associated both to the estimation of DMS fluxes and to the subsequent dispersion in the atmosphere, the actual contribution of North Atlantic DMS to European pollution levels can vary by a factor of 3. [References: 54]
机译：得出了每月解析的排放预算，该预算旨在再现北大西洋海洋上观测到的二甲基硫（DMS）生产的季节性变化。海水中DMS浓度及其在北大西洋中的分布的每月周期是根据可用的现场测量结果整理得出的。 DMS通量的计算是基于Liss和Merlivat（1986）的海-大气间气体交换公式，并使用了来自欧洲中程预报中心1988年的六小时气象数据。这可以显示出其影响气象条件对DMS通向大气的通量的影响。结果显示，北大西洋的平均通量在39-390μg S m（-2）d（-1）范围内，夏季每月最大值在67至1260μgS m（-2）d（-1）之间），大约是冬季最小值的20倍。借助三维欧拉弥散模型，评估了欧洲自然海洋硫对酸性沉积水平的贡献，并将其与欧洲和北美人为来源的单独贡献进行了比较。尽管在夏季月份中，生物成因硫对欧洲西海岸总硫沉积的相对贡献每年不超过2％，但可能接近10％。考虑到与DMS通量的估算以及随后的大气扩散有关的不确定性范围，北大西洋DMS对欧洲污染水平的实际贡献可能相差3倍。[参考文献：54]

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