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yexuqing木蟲之王 (文學(xué)泰斗)
太陽系系主任
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[交流]
Atmospheric rivers cause warm winters and extreme heat events
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Atmospheric rivers cause warm winters and extreme heat events 大氣層河流導(dǎo)致暖冬和極端高溫事件 ▲ 作者：Serena R. Scholz & Juan M. Lora ▲鏈接： https://www.nature.com/articles/s41586-024-08238-7 ▲摘要： 在此，我們展示了在許多中緯度地區(qū)，大氣層河流（AR）頻繁發(fā)生的季節(jié)的溫度也高于平均溫度，并且AR事件與高于氣候平均值5—10°C的溫度異常有關(guān)。這是由于低層大氣中感熱和水汽的異常水平輸送和輻合，增加了地表向下的感熱通量和向下的長波輻射。 在小時的時間尺度上，在中緯度的大部分地區(qū)，超過70%的極端溫暖溫度異常發(fā)生在AR內(nèi)，并且AR與全球許多地區(qū)的潮濕和復(fù)合熱浪有關(guān)，這表明將AR納入考量因素可能會提高某些極端熱事件的預(yù)測能力。 ▲ 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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