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The Roles of Climate Forcing and Its Variability on Streamflow at Daily, Monthly, Annual, and Long‐Term Scales
Water Resources Research ( IF 4.6 ) Pub Date : 2020-07-23 , DOI: 10.1029/2020wr027111
Lili Yao 1 , Dominic A. Libera 1 , Marwan Kheimi 1 , A. Sankarasubramanian 2 , Dingbao Wang 1
Affiliation  

The temporal variability of precipitation and potential evapotranspiration affects streamflow from daily to long‐term scales, but the relative roles of different climate variabilities on streamflow at daily, monthly, annual, and mean annual scales have not been systematically investigated in the literature. This paper developed a new daily water balance model, which provides a unified framework for water balance across timescales. The daily water balance model is driven by four climate forcing scenarios (observed daily climate and observed daily climate with its intra‐monthly, intra‐annual, and inter‐annual variability removed) and applied to 78 catchments. Daily streamflow from the water balance model is aggregated to coarser timescales. The relative roles of intra‐monthly, intra‐annual, and inter‐annual climate variability are evaluated by comparing the modeled streamflow forced with the climate forcings at two consecutive timescales. It is found that daily, monthly, and annual streamflow is primarily controlled by the climate variability at the same timescale. Intra‐monthly climate variability plays a small role in monthly and annual streamflow variability. Intra‐annual climate variability has significant effects on streamflow at all the timescales, and the relative roles of inter‐annual climate variability are also significant to the monthly and mean annual streamflow, which is often disregarded. The quantitative evaluation of the roles of climate variability reveals how climate controls streamflow across timescales.

中文翻译:

每日,每月,每年和长期尺度上气候强迫的作用及其变化对流量的影响

降水和潜在蒸散量的时间变化会影响从日尺度到长期尺度的径流,但是在文献中尚未系统地研究过不同气候变化在日尺度,月尺度,年尺度和年均尺度上的相对作用。本文开发了一种新的每日水平衡模型,该模型为跨时间尺度的水平衡提供了统一的框架。每日水平衡模型由四种气候强迫情景(观测到的每日气候和观测到的每日气候,去除了其月内,年内和年际变化)驱动,并应用于78个集水区。水平衡模型的每日流量汇总到更粗略的时间尺度。月内,年内,通过在两个连续的时间尺度上比较模拟的强迫水流和气候强迫,评估了年际和年际气候变异性。发现每天,每月和每年的流量主要受同一时间尺度上的气候变异性控制。月内气候变化在月和年流量变化中起很小的作用。年内气候变率在所有时间尺度上均对流量产生重大影响,年际气候变率的相对作用对于月流量和年均流量也很重要,而这常常被忽略。对气候变异性作用的定量评估揭示了气候如何控制跨时标的流量。发现每天,每月和每年的流量主要受同一时间尺度上的气候变化控制。月内气候变化在月和年流量变化中起很小的作用。年内气候变率在所有时间尺度上均对流量产生重大影响,年际气候变率的相对作用对于月流量和年均流量也很重要,而这常常被忽略。对气候变异性作用的定量评估揭示了气候如何控制跨时标的流量。发现每天,每月和每年的流量主要受同一时间尺度上的气候变异性控制。月内气候变化在月和年流量变化中起很小的作用。年内气候变率在所有时间尺度上均对流量产生重大影响,年际气候变率的相对作用对于月流量和年均流量也很重要,而这常常被忽略。对气候变异性作用的定量评估揭示了气候如何控制跨时标的流量。年内气候变率在所有时间尺度上都对流量产生重大影响,年际气候变率的相对作用对于月流量和年均流量也很重要,而这常常被忽略。对气候变异性作用的定量评估揭示了气候如何控制跨时标的流量。年内气候变率在所有时间尺度上均对流量产生重大影响,年际气候变率的相对作用对于月流量和年均流量也很重要,而这常常被忽略。对气候变异性作用的定量评估揭示了气候如何控制跨时标的流量。
更新日期:2020-07-23
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