Climate Change Data Portal
DOI | 10.1029/2019JD032367 |
The Climatological Context of Trends in the Onset of Northern Hemisphere Seasonal Snow Cover, 1972–2017 | |
Allchin M.I.; Déry S.J. | |
发表日期 | 2020 |
ISSN | 2169897X |
卷号 | 125期号:17 |
英文摘要 | Several studies based on the longest remotely sensed record of Northern Hemisphere seasonal snow cover have indicated that its extent has increased over large areas of Eurasia and North America during the transition from summer to winter. Given current understanding of widespread warming trends, this finding is somewhat surprising. It has been suggested that these increases are artifacts of technological improvements in the data set's production. Alternatively, if such trends do reflect actual changes in the timing and location of snow onset, it follows that associations should exist with altered spatiotemporal patterns of atmospheric activity likely to influence the probability of snowfall. This study places significant onset trends during September to December between 1972 and 2017 within the context of means and trends of a range of relevant metrics of middle-to-lower tropospheric activity between 1972 and 2014, summarized from monthly reanalysis data. The results suggest that clear explanatory links exist between earlier (and later) onset, and patterns of trends in 500 hPa geopotential heights and sea level pressure, airflows at 500 and 850 hPa, atmospheric humidity, and near-surface temperature. These findings suggest that most incidences of progressively earlier Eurasian snow cover result from northward advection of moisture by stronger southerly winds, driven by altered zonal gradients in geopotential height north of the Himalayan ranges. Over North America, moisture has been supplied primarily from maritime sources along zonal airflows induced by meridional gradients. ©2020. American Geophysical Union. All Rights Reserved. |
英文关键词 | climate change; remote sensing; seasonal snow-onset |
语种 | 英语 |
来源期刊 | Journal of Geophysical Research: Atmospheres |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/185803 |
作者单位 | Natural Resources and Environmental Studies Program, University of Northern British Columbia, Prince George, BC, Canada; Environmental Science and Engineering Program, University of Northern British Columbia, Prince George, BC, Canada |
推荐引用方式 GB/T 7714 | Allchin M.I.,Déry S.J.. The Climatological Context of Trends in the Onset of Northern Hemisphere Seasonal Snow Cover, 1972–2017[J],2020,125(17). |
APA | Allchin M.I.,&Déry S.J..(2020).The Climatological Context of Trends in the Onset of Northern Hemisphere Seasonal Snow Cover, 1972–2017.Journal of Geophysical Research: Atmospheres,125(17). |
MLA | Allchin M.I.,et al."The Climatological Context of Trends in the Onset of Northern Hemisphere Seasonal Snow Cover, 1972–2017".Journal of Geophysical Research: Atmospheres 125.17(2020). |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Allchin M.I.]的文章 |
[Déry S.J.]的文章 |
百度学术 |
百度学术中相似的文章 |
[Allchin M.I.]的文章 |
[Déry S.J.]的文章 |
必应学术 |
必应学术中相似的文章 |
[Allchin M.I.]的文章 |
[Déry S.J.]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。