气候变化领域集成服务门户(CCPortal): Rising summer river water temperature across Canada: spatial patterns and hydroclimatic controls

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DOI	10.1088/1748-9326/ad365f
	Rising summer river water temperature across Canada: spatial patterns and hydroclimatic controls
	Shrestha, Rajesh R.; Pesklevits, Jennifer C.; Bonsal, Barrie R.; Brannen, Rosa; Guo, Tammy; Hoffman, Sydney
发表日期	2024
ISSN	1748-9326
起始页码	19
结束页码	4
卷号	19 期号:4
英文摘要	Understanding the spatio-temporal variability of climate-induced river water temperature change is critical for identifying hotspots and assessing the impacts on ecological and socioeconomic systems. Here, we employ the air2stream model reconstructed river temperature records for 106 stations in Canada (Nash Sutcliffe coefficient goodness-of-fit: minimum = 0.79; median = 0.93; maximum = 0.97) to analyze summer temperature changes over the years 1980-2018. Results reveal widespread river temperature increases from June to September, with significantly increasing trends for about 40%-60% of stations. Additionally, we find significantly rising 7-day maximum temperature and increasing occurrences over the critical 18 and 20 degrees C thresholds for about 30%-65% of stations. Furthermore, by employing the Ward's agglomerative hierarchical clustering machine learning (ML) method, we identify eight regions of spatially coherent variability and change. We find that the south-east, coast and northern prairies are the regions of high vulnerability because of the likely impacts of rising summer water temperatures on cold-water aquatic species. Additionally, by using the random forests ML method, we demonstrate that mean air temperature and its trends are the primary drivers of mean water temperature and trends, respectively. Thus, with the projected enhanced air temperature increase across Canada, an amplified future summer river warming can be expected, which could have severe consequences, particularly in already thermally-stressed river systems.
英文关键词	Air2stream model; cluster analysis; data reconstruction; hydroclimatic controls; river temperature; trend analysis; variable importance analysis
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001196311300001
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/296674
作者单位	Environment & Climate Change Canada; Environment & Climate Change Canada; Environment & Climate Change Canada; University of Waterloo; University of Victoria
推荐引用方式 GB/T 7714	Shrestha, Rajesh R.,Pesklevits, Jennifer C.,Bonsal, Barrie R.,et al. Rising summer river water temperature across Canada: spatial patterns and hydroclimatic controls[J],2024,19(4).
APA	Shrestha, Rajesh R.,Pesklevits, Jennifer C.,Bonsal, Barrie R.,Brannen, Rosa,Guo, Tammy,&Hoffman, Sydney.(2024).Rising summer river water temperature across Canada: spatial patterns and hydroclimatic controls.ENVIRONMENTAL RESEARCH LETTERS,19(4).
MLA	Shrestha, Rajesh R.,et al."Rising summer river water temperature across Canada: spatial patterns and hydroclimatic controls".ENVIRONMENTAL RESEARCH LETTERS 19.4(2024).