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首页> 外文期刊>Atmospheric chemistry and physics >Modeling cosmogenic radionuclides sup10/supBe and sup7/supBe during the Maunder Minimum using the ECHAM5-HAM General Circulation Model
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Modeling cosmogenic radionuclides sup10/supBe and sup7/supBe during the Maunder Minimum using the ECHAM5-HAM General Circulation Model

机译：使用ECHAM5-HAM通用循环模型在Maunder最小值期间模拟宇宙成因放射性核素 10 Be和 7 Be

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All existing 10Be records from Greenland and Antarctica show increasingconcentrations during the Maunder Minimum period (MM), 1645–1715, when solaractivity was very low and the climate was colder (little ice age). In detail,however, the 10Be records deviate from each other. We investigate towhat extent climatic changes influence the 10Be measured in ice bymodeling this period using the ECHAM5-HAM general circulation model.Production calculations show that during the MM the mean global 10Beproduction was higher by 32% than at present due to lower solar activity.Our modeling shows that the zonally averaged modeled 10Be depositionflux deviates by only ~8% from the average increase of 32%, indicatingthat climatic effects are much smaller than the production change. Due toincreased stratospheric production, the 10Be content in the downwardfluxes is larger during MM, leading to larger 10Be deposition fluxes inthe subtropics, where stratosphere-troposphere exchange (STE) is strongest.In polar regions the effect is small. In Greenland the deposition changedepends on latitude and altitude. In Antarctica the change is larger in theeast than in the west. We use the 10Be/7Be ratio to study changes inSTE. We find larger change between 20° N–40° N duringspring, pointing to a stronger STE in the Northern Hemisphere during MM. Inthe Southern Hemisphere the change is small. These findings indicate thatclimate changes do influence the 10Be deposition fluxes, but not enoughto significantly disturb the production signal. Climate-induced changesremain small, especially in polar regions.
机译：格陵兰岛和南极洲的所有现有 10 Be记录都表明，在1645年至1715年的蒙德最小时期（MM）期间，浓度升高了，当时太阳活动非常低，气候更冷（小冰河时期）。但是，详细而言， 10 Be记录彼此不同。我们通过使用ECHAM5-HAM通用环流模型对该时段进行建模，研究了气候变化在多大程度上影响了冰中 10 的测量。生产计算表明，在MM期间，全球平均 10 由于较低的太阳活动，增产比目前高32％。我们的模型显示，区域平均建模的 10 Be沉积通量与平均增长32％仅相差约8％，表明气候效应比生产变化要小得多。由于平流层产量的增加，MM向下通量中的 10 Be含量较大，导致亚热带中平流层-对流层交换（STE）为在极地地区，效果很小。在格陵兰，沉积变化取决于纬度和高度。在南极洲，东部的变化大于西部的变化。我们使用 10 Be / 7 Be比值研究STE的变化。我们发现春季20°N–40°N之间的变化较大，这表明MM期间北半球的STE较强。在南半球，变化很小。这些发现表明气候变化确实会影响 10 Be沉积通量，但不足以显着干扰生产信号。气候引起的变化仍然很小，尤其是在极地地区。

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