Decreasing relative humidity dominates a reversal of decreasing pan evaporation in mainland China after 1989

Decreasing relative humidity dominates a reversal of decreasing pan evaporation in mainland China after 1989
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1989年后,相对湿度的下降主导了中国大陆蒸发皿蒸发量下降的逆转

DOI:
10.1016/j.jhydrol.2022.127641
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发表时间:
2022-02
影响因子:
6.4
通讯作者:
Zhenzhong Zeng
Zhenzhong Zeng
中科院分区:
地球科学1区
文献类型:
--
作者:
Yubin Jin;Dashan Wang;Yu Feng;Jie Wu;Wenhui Cui;Xinyue He;Aifang Chen;Zhenzhong Zeng

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蒸发皿蒸发量(Epan)反映了地表水的蒸发潜力,是大气蒸发需求的关键指标。之前的研究发现,2000年代末之前,中国的Epanacross大幅减少,主要是风速和太阳辐射的下降。然而,自 2000 年代末以来,Epan 如何应对风速和太阳辐射的恢复仍不清楚。在这里,我们根据1965年至2018年中国2018个站点的逐日气象观测,研究了埃潘的时空格局,并分析了其控制因素。我们发现,西北和华南地区的年Epanin高于东北和中部地区。 1965年至1989年间,全国平均Epan以-6.57 mm yr−2的速度显着下降,然后以4.58 mm yr−2的速度逆转。观察到 Epantrends 存在明显的季节性差异和地理异质性。 1989年之前,风速下降是Epan下降的主要原因,而拐点之后,相对湿度则成为驱动Epan增长的主导因素。风速的恢复对我国部分地区的平变仍具有显着影响,而秋季平变仅在华中地区主要受太阳辐射影响。我们的研究结果强调了了解变化和驱动因素的重要性,并呼吁采取预防和适应行动来对抗和防止中国特别是中国南方的突发干旱。
Pan evaporation (Epan) reflects the evaporation potential of surface water and is a key indicator of atmospheric evaporative demand. Previous studies have found a substantial decrease in Epanacross China, dominated by declining wind speed and solar radiation before the late 2000 s. However, how Epanresponds to the recovery of wind speed and solar radiation since the late 2000 s remains unclear. Here, we investigate the spatial and temporal patterns of Epanand analyze its controlling factors, based on the daily meteorological observations during 1965–2018 at 2,018 stations over China. We find that the annual Epanin the northwest and south of China is higher than that in the northeast and central parts of China. The national mean Epandecreases significantly during 1965–1989 at a rate of −6.57 mm yr−2, then reverses at a rate of 4.58 mm yr−2. Distinct seasonal discrepancies and geographical heterogeneities in Epantrends are observed. Declining wind speed mainly contributes to the decrease in Epanbefore 1989, while relative humidity is shown as the dominant factor that drives the growth of Epanafter the turning point. The recovery of wind speed still has significant impact on Epanvariation in parts of China, while Epanis only mainly affected by solar radiation in parts of central China in autumn. Our findings highlight the importance of understanding Epanvariations and driving factors, and call for precautions and adaptation actions to combat and prevent flash droughts over China, especially in the south of China.
使用观测到的中国蒸发皿蒸发量评估气候模型中蒸发需求的估计
DOI: 10.1002/2016jd025166
发表时间: 2016-07
期刊: Journal of Geophysical Research - D: Atmospheres
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