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yexuqing木虫之王 (文学泰斗)
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Atmospheric rivers cause warm winters and extreme heat events
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Atmospheric rivers cause warm winters and extreme heat events 大气层河流导致暖冬和极端高温事件 ▲ 作者：Serena R. Scholz & Juan M. Lora ▲链接： https://www.nature.com/articles/s41586-024-08238-7 ▲摘要： 在此，我们展示了在许多中纬度地区，大气层河流（AR）频繁发生的季节的温度也高于平均温度，并且AR事件与高于气候平均值5—10°C的温度异常有关。这是由于低层大气中感热和水汽的异常水平输送和辐合，增加了地表向下的感热通量和向下的长波辐射。 在小时的时间尺度上，在中纬度的大部分地区，超过70%的极端温暖温度异常发生在AR内，并且AR与全球许多地区的潮湿和复合热浪有关，这表明将AR纳入考量因素可能会提高某些极端热事件的预测能力。 ▲ Abstract： Here we show that seasons with more frequent ARs also have warmer than average temperatures in many mid-latitude regions, and that AR events are associated with temperature anomalies of 5–10?°C above the climatological mean. This is due to anomalous horizontal transport and convergence of sensible heat and moisture in the lower atmosphere, which increases both downward sensible heat flux and downwelling long-wave radiation at the surface. On an hourly timescale, over 70% of extreme warm-temperature anomalies occur within ARs in large portions of the mid-latitudes, and ARs are associated with moist and compound heatwaves in many regions worldwide, suggesting that consideration of ARs may improve predictive capability for certain extreme heat events. Our results demonstrate that ARs significantly impact air temperatures on a wide array of timescales, and that they may play a wider role in global energy transport than previously recognized. |
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