The relationship between large volcanic eruptions in different latitudinal zones and spatial patterns of winter temperature anomalies over China
The relationship between large volcanic eruptions in different latitudinal zones and spatial patterns of winter temperature anomalies over China
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不同纬度地区大型火山喷发与我国冬季气温异常空间格局的关系
DOI：
10.1007/s00382-019-04937-4
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发表时间：
2019-11
期刊：
影响因子：
4.6
通讯作者：
Hao Zhixin
中科院分区：
文献类型：
--
作者：
Sun Di;Zheng Jingyun;Zhang Xuezhen;Hao Zhixin
利用再分析资料和共同体地球系统模式模拟，确定了1956-2005年中国地区冬季温度对不同纬度、不同季节大规模火山喷发响应的区域差异，并研究了相应冬季温度异常空间型的大气环流。观测和模拟都表明，中国冬季气温异常的空间分布与火山喷发的纬度和季节有关。夏季热带火山喷发，由于高度梯度增大，导致中国东部冬季气温下降0.41.6℃。冬季火山喷发导致西藏地区普遍变暖。夏季低纬火山喷发后，由于西伯利亚高压较弱，中国东部地区出现暖冬。冬季喷发后，一股反常的偏南风导致中国大部分地区略有升温。伴随着典型的北半球高纬度“槽-脊-槽”，夏季中纬度喷发后，中国东北部冬季气温下降，中国西部冬季气温升高。然而，冬季喷发后，气温普遍上升。对于夏季高纬度喷发，由于西伯利亚高压和东亚大槽的加强，冬季温度在中国西北部和中东部表现出一致的下降。由于冬季火山喷发后65°-45°N之间的经向环流减弱，中国上空出现了普遍的增温。
We identified regional differences over China of winter temperature response to large volcanic eruptions with different latitudes and seasons from 1956 to 2005, and investigated atmospheric circulations for corresponding spatial patterns of winter temperature anomalies using reanalysis data and simulations by the Community Earth System Model. Both observations and simulations show that spatial patterns of winter temperature anomalies over China are related to the latitudes and seasons of the eruptions. Tropical volcanic eruptions during summer led to winter temperature decreases of 0.4–1.6 °C in eastern China due to the increase of height gradient. Winter volcanic eruptions led to extensive warming over Tibet. Following summer volcanic eruptions at low latitude, there were warm winters in eastern China because of a weak Siberian high. An anomalous southerly wind caused slight warming over most of China following winter eruptions. With the typical “trough–ridge–trough” at high latitude of the Northern Hemisphere, the winter temperature decreased in northeastern China and increased in western China following summer eruptions at mid-latitude. However, temperature generally increased after winter eruptions. For summer eruptions at high latitude, winter temperature showed a coherent decrease over northwest and east-central China due to an intensified Siberian High and East Asian trough. The widespread warming occurred over China because of the meridional circulation between 65°N and 45°N was weaker following winter volcanic eruptions.
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影响因子：
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作者：
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