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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A general climate model simulation of the aerosol radiative effects of the Laacher See eruption (10,900 BC)
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A general climate model simulation of the aerosol radiative effects of the Laacher See eruption (10,900 BC)

机译：Laacher See喷发的气溶胶辐射效应的一般气候模型模拟（公元前10900年）

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摘要

A simulation of radiative forcing and zonal mean temperature effects is presented for the Laacher See eruption (10,900 B.C.). A climate model which also covers the middle atmosphere is forced with background conditions representative of the Younger Dryas period. The Laacher See eruption is simulated by the injection of 15 Mt Of SO2 to the lower stratosphere. The resulting sulfate loading in the stratosphere is comparable with post-Pinatubo (1991) observations, but clearly restricted to the Northern Hemisphere. The sulfate aerosol decays with an e-folding time of approximately 11 months, that is, also similar to recent observations. The high concentration of aerosol in the high latitudes leads to strongly intensified cooling in the polar night and to an intensified polar vortex. This produces midlatitude "continental winter warming" in the troposphere as observed after tropical eruptions. After tropical eruptions, strong absorption of terrestrial and near-infrared solar radiation in the lower latitudes is responsible for the strengthening of the polar vortex. However, for midlatitude and high-latitude eruptions it is the intense irradiance of longwave radiation from the aerosol-containing layer at polar latitudes that produces the meridional thermal gradient enhancing the polar vortex. [References: 44]
机译：给出了Laacher See爆发（公元前10900年）的辐射强迫和纬向平均温度效应的模拟。一个也包含中层大气的气候模型被迫以代表年轻树妖时代的背景条件为基础。通过向平流层下部注入15 Mt的SO2来模拟Laacher See爆发。平流层中产生的硫酸盐含量与皮纳图博火山（1991年）之后的观测结果相当，但显然仅限于北半球。硫酸盐气溶胶以约11个月的电子折叠时间衰减，这也与最近的观察结果相似。高纬度地区的高浓度气溶胶会导致极地夜晚的降温强烈并导致极地涡旋加剧。热带喷发后观测到，这会在对流层产生中纬度“大陆冬季变暖”。热带爆发后，低纬度地区强烈吸收了地面和近红外太阳辐射，这是导致极地涡旋增强的原因。但是，对于中纬度和高纬度爆发，正是来自气溶胶含气层的长波辐射在极纬度的强烈辐照，产生了增强极涡的子午热梯度。 [参考：44]

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