Capturing convection essential for projections of climate change in African dust emission

Capturing convection essential for projections of climate change in African dust emission
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捕获对流对于预测非洲沙尘排放中的气候变化至关重要

DOI:
10.1038/s41612-021-00201-x
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发表时间:
2021
影响因子:
9
通讯作者:
Garcia-Carreras L
Garcia-Carreras L
中科院分区:
地球科学1区
文献类型:
--
作者:
Garcia-Carreras L

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夏季的撒哈拉沙漠和萨赫勒地区是世界上最大的空中矿物尘埃来源。冷池流出湿对流('haboobs')是夏季隆起的主要来源,但基本上是失踪的全球模式,提出了重大问题的可靠性气候预测的灰尘和灰尘的影响。在这里,我们使用对流允许模拟泛非洲气候变化,明确捕捉haboobs,调查全球模型的这一关键限制是否会影响预测。我们表明,明确的对流是关键捕捉所观察到的夏季最大的灰尘产生的风,这是错过了参数化对流。尽管如此,未来的气候变化在沙尘产生的风是更敏感的显式对流的影响,更广泛的气象比他们自己的哈布,模式差异的变化,沙尘产生的风达到60%的当前值。因此,结果表明,改善对流的气候模式的尘埃预测的重要性。
The summertime Sahara and Sahel are the world’s largest source of airborne mineral dust. Cold-pool outflows from moist convection (‘haboobs’) are a dominant source of summertime uplift but are essentially missing in global models, raising major questions on the reliability of climate projections of dust and dust impacts. Here we use convection-permitting simulations of pan-African climate change, which explicitly capture haboobs, to investigate whether this key limitation of global models affects projections. We show that explicit convection is key to capturing the observed summertime maximum of dust-generating winds, which is missed with parameterised convection. Despite this, future climate changes in dust-generating winds are more sensitive to the effects of explicit convection on the wider meteorology than they are to the haboobs themselves, with model differences in the change in dust-generating winds reaching 60% of current values. The results therefore show the importance of improving convection in climate models for dust projections.
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