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On the impact of future climate change on tropopause folds and tropospheric ozone

机译：关于对流层压折叠和对流层臭氧的对抗气候变化的影响

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摘要

Using a transient simulation for the period 19602100 with the state-of-the-art ECHAM5/MESSy Atmospheric Chemistry (EMAC) global model and a tropopause fold identification algorithm, we explore the future projected changes in tropopause folds, stratosphere-to-troposphere transport (STT) of ozone, and tropospheric ozone under the RCP6.0 scenario. Statistically significant changes in tropopause fold frequencies from 1970-1999 to 2070-2099 are identified in both hemispheres, regionally exceeding 3 %, and are associated with the projected changes in the position and intensity of the subtropical jet streams. A strengthening of ozone STT is projected for the future in both hemispheres, with an induced increase in transported stratospheric ozone tracer throughout the whole troposphere, reaching up to 10 nmol mol(-1) in the upper troposphere, 8 nmol mol(-1) in the middle troposphere, and 3 nmol mol(-1) near the surface. Notably, the regions exhibiting the largest changes of ozone STT at 400 hPa coincide with those with the highest fold frequency changes, highlighting the role of the tropopause folding mechanism in STT processes under a changing climate. For both the eastern Mediterranean and Middle East (EMME) and Afghanistan (AFG) regions, which are known as hotspots of fold activity and ozone STT during the summer period, the year-to-year variability of middle-tropospheric ozone with stratospheric origin is largely explained by the short-term variations in ozone at 150 hPa and tropopause fold frequency. Finally, ozone in the lower troposphere is projected to decrease under the RCP6.0 scenario during MAM (March, April, and May) and JJA (June, July, and August) in the Northern Hemisphere and during DJF (December, January, and February) in the Southern Hemisphere, due to the decline of ozone precursor emissions and the enhanced ozone loss from higher water vapour abundances, while in the rest of the troposphere ozone shows a remarkable increase owing mainly to the STT strengthening and the stratospheric ozone recovery.
机译：使用瞬态仿真在19602100期间，具有最先进的ECHAM5 /凌乱的大气化学（EMAC）全球模型和对流折叠识别算法，我们探讨了对流层到对流层运输的未来预计变化（STT）臭氧和rcp6.0场景下的对流层臭氧。从1970-1999到2070-2099的统计学上显着的变化在两个半球中鉴定出来，区域上超过3％，并且与亚热带喷射流的位置和强度的投影变化相关。在整个对流层中，在整个半球上投射臭氧STT的未来，在整个对流层中诱导输送的平坦型臭氧示踪剂，在上层过度达到10nmol摩尔（-1），8 Nmol Mol（-1）在中间对流层中，以及3诺米尔莫尔（-1）附近。值得注意的是，表现出400hPa的臭氧STT变化的区域与倍频变化最高的臭氧的变化，突出了在变化气候下的STT过程中的对流折叠折叠机制的作用。对于东地中海和中东（EMME）和阿富汗（AFG）地区，称为夏季期间的折叠活动和臭氧STT的热点，具有平流层来源的中层臭氧的逐年变异性是在很大程度上解释了150 HPA和对流倍倍率的臭氧的短期变化。最后，较低的对流层中的臭氧被预计在摩尔（3月，4月，5月）和JJA（六月，7月，8月）在北半球和DJF（1月，1月，1月份和1月）期间（六月，7月和8月）下的RCP6.0情景下降。 2月）在南半球，由于臭氧前体排放和来自较高水蒸气丰富的增强臭氧损失的衰落，而在对流层臭氧的其余部分，主要是由于STT强化和平流层臭氧恢复而显着增加。

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