Easy Volcanic Aerosol (EVA v1.0): an idealized forcing generator for climate simulations
Easy Volcanic Aerosol (EVA v1.0): an idealized forcing generator for climate simulations
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DOI：
10.5194/gmd-9-4049-2016
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发表时间：
2016-11
影响因子：
5.1
通讯作者：
M. Toohey;B. Stevens;H. Schmidt;C. Timmreck
中科院分区：
文献类型：
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作者：
M. Toohey;B. Stevens;H. Schmidt;C. Timmreck
抽象的。火山喷发产生的平流层硫酸盐气溶胶对地球气候有重大影响。为了在气候模式模拟中包括火山喷发的影响，Easy火山气溶胶(EVA)强迫发生器为给定的火山喷发属性的输入列表提供作为时间、纬度、高度和波长的函数的平流层气溶胶光学特性。EVA基于平流层输送的参数化三箱模式和简单的尺度关系，用于从平流层硫酸盐质量推算中可见光(550 Nm)气溶胶光学厚度和气溶胶有效半径。根据Mie理论计算的预先计算的查找表被用来产生与波长相关的气溶胶消光、单次散射反照率和散射不对称因子值。选择EVA的结构形式及其参数的调整，是为了与1991年皮纳图博喷发后平流层气溶胶性质的卫星重建以及之前的千年时间尺度强迫重建，包括1815年坦博拉喷发，产生最好的一致。EVA可以用来为气候模型产生火山强迫，该模型基于最近的观察和物理理解，但在任何选择的时间尺度上都是内部自洽的。此外，EVA的构造是为了便于对气溶胶属性的不同方面进行修改，以便在模型试验中使用，以帮助进一步了解火山气溶胶的哪些方面对气候系统很重要。
Abstract. Stratospheric sulfate aerosols from volcanic eruptions have a significant impact on the Earth's climate. To include the effects of volcanic eruptions in climate model simulations, the Easy Volcanic Aerosol (EVA) forcing generator provides stratospheric aerosol optical properties as a function of time, latitude, height, and wavelength for a given input list of volcanic eruption attributes. EVA is based on a parameterized three-box model of stratospheric transport and simple scaling relationships used to derive mid-visible (550 nm) aerosol optical depth and aerosol effective radius from stratospheric sulfate mass. Precalculated look-up tables computed from Mie theory are used to produce wavelength-dependent aerosol extinction, single scattering albedo, and scattering asymmetry factor values. The structural form of EVA and the tuning of its parameters are chosen to produce best agreement with the satellite-based reconstruction of stratospheric aerosol properties following the 1991 Pinatubo eruption, and with prior millennial-timescale forcing reconstructions, including the 1815 eruption of Tambora. EVA can be used to produce volcanic forcing for climate models which is based on recent observations and physical understanding but internally self-consistent over any timescale of choice. In addition, EVA is constructed so as to allow for easy modification of different aspects of aerosol properties, in order to be used in model experiments to help advance understanding of what aspects of the volcanic aerosol are important for the climate system.