中度的净降水量随着北极的变暖而减少
Cody C Routson1, Nicholas P McKay2, Darrell S Kaufman2
1School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, USA. cody.routson@nau.edu.
Nature
|March 29, 2019
概括
在全新纪期间,赤道至极点的温度梯度较弱,与中度降水量减少有关. 目前的变暖趋势表明,由于这种减弱的梯度,未来水资源也会减少.
科学领域:
- 古气候学
- 大气科学
- 气候模型
背景情况:
- 度温度梯度对于大气稳定性,喷流强度和旋风活动至关重要.
- 全球变暖正在削弱北半球每年的地表温度梯度,
- 这些变化对中度气候的影响尚不完全理解.
研究的目的:
- 研究全新纪度温度梯度与中度净降水之间的关系.
- 为了比较过去的气候变化与当前的变暖趋势.
主要方法:
- 全新纪元古气候记录的汇编 (10°南至90°北).
- 对全新世纪中期气候模型模拟的分析.
- 温度梯度和中度湿度演变的量化.
主要成果:
- 在 Holocene 早期到中期,度温度梯度较弱,与中度净降水量下降相关.
- 这种模式表明较弱的温度梯度导致西部流量减少,气旋较弱,降水较少.
- 目前的高度变暖正在将赤道到极点的梯度降低到全新纪的水平.
结论:
- 全新纪的数据表明,温度梯度较弱与中度降水减少之间存在联系.
- 如果目前的变暖遵循全新世纪的模式, 预计中度水资源将大幅减少.
- 了解过去的气候动态,可以了解未来的气候变化影响.
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