Investigation of Springtime Cloud Influence on Regional Climate and Its Implication in Runoff Decline in Upper Colorado River Basin
Investigation of Springtime Cloud Influence on Regional Climate and Its Implication in Runoff Decline in Upper Colorado River Basin
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科罗拉多河流域春季云对区域气候的影响及其对径流下降的影响
DOI：
10.1029/2021ea002059
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发表时间：
2022
影响因子：
3.1
通讯作者：
Fu, Rong
中科院分区：
文献类型：
--
作者：
Lin, Yun;Takano, Yoshihide;Gu, Yu;Wang, Jingyu;Zhao, Bin;Liou, Kuo‐Nan;Fu, Rong
在上游科罗拉多河流域（UCRB）的径流量和其他相关水文气候变量的年趋势的亚季节特征进行了研究，使用多个数据集，从原位观测，再分析和建模早春（2月，3月和4月），考虑到约58%的年平均径流量下降，从1980年到2018年干在三个月的减少。我们的分析表明，3月份的水文气候变量的强年度趋势比其他两个月更显着。虽然最近的观测研究将年总径流量或冷暖季节径流量的下降归因于区域变暖和降水减少，但我们首次提出，3月份径流量的较大下降趋势是由云光学厚度下降引起的，这导致降水进一步减少，温度在气候变暖的基础上增加。额外的变暖可能会通过增加3月份的蒸发来减少流域的可用水资源。最近的云抑制可能是由于更强的沉降和更大的水汽通量的分歧，在美国西南部，因为异常的环流模式在不同的气候，从而导致干燥的大气，这是不利的云的形成/发展的UCRB地区。云对UCRB 3月径流的影响揭示了在气候变化中理解水文气候亚季节变化的重要性，以及需要进一步研究环流模式对气候变化的响应及其对当地水文气候的影响。
The subseasonal features of the annual trends of runoff and other associated hydroclimatic variables in the upper Colorado River basin (UCRB) are examined using multiple data sets from in situ observations, reanalysis, and modeling for early spring (February, March, and April), given that about 58% of annual mean runoff decline from 1980 to 2018 stem from its decreases in the three months. Our analysis suggests that the strong annual trends of hydroclimatic variables in March are more statistically significant than other two months. While recent observational studies attribute the decline of runoff for either annual total or cool and warm seasons to regional warming and precipitation decrease, we suggested, for the first time, that a larger decreasing trend of the runoff in March is caused by the declining cloud optical depth which induces further decrease in precipitation and additional increase in temperature on top of climatic warming. The extra warming can reduce available water resource in the basin likely by enhancing evaporation in March. The recent cloud suppression likely results from stronger subsidence and larger moisture flux divergence over southwestern United States because of abnormal circulation patterns in varying climate, in turn leading to drier atmosphere which is unfavorable for cloud formation/development over the UCRB region. The cloud influence on the runoff in March in the UCRB revealed in this study implies the importance of understanding subseasonal variations of hydroclimate in the changing climate, as well as a need of future studies on the response of circulation patterns to climate change at subseasonal level and its implication on local hydroclimate.
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影响因子：
5.2
作者：
F. Lehner;C. Deser;I. Simpson;L. Terray
通讯作者：
F. Lehner;C. Deser;I. Simpson;L. Terray
对流层上层湿度与卷云几何和光学厚度：根据 1 年同期的 AIRS 和 CALIPSO 数据推断出的关系
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
N. Lamquin;C. Stubenrauch;J. Pelon
通讯作者：
J. Pelon
降水形成与天气场数量的统计关系
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
H. Sakakibara
通讯作者：
H. Sakakibara
有证据表明最近的变暖正在减少科罗拉多河上游的流量
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
G. McCabe;D. Wolock;G. Pederson;C. Woodhouse;S. McAfee
通讯作者：
S. McAfee
了解美国西部年度径流对季节性变暖响应的不对称性
影响因子：
5.4
作者：
Z. Ban;T. Das;D. Cayan;M. Xiao;D. Lettenmaier
通讯作者：
D. Lettenmaier