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Snow water changes with elevation over the Western United States in IPCC AR4 models

机译：IPCC AR4模型中，雪水随美国西部海拔的升高而变化

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This work analyzes variations of snow water with elevation for a group of AR4 models over the Western United States. The results are expressed in terms of both snow water equivalent (SWE), which is the depth of snow if melted, and snow water volume (SWV), which is the total volume of SWE for a specified region. The decrease in total SWV over the study region between 1905 and 25 and 1980–99 is about 22%, which is in the range of the observed values. The results for both the A1b and B1 scenarios for the middle twenty-first century both show a near total loss of SWE at lower elevations. However, the largest losses for SWV are near 1800 m. Furthermore, the total SWV loss for the A1b scenario is about 63%, whereas that for the more moderate B1 scenario is about 49%. Thus, a reduction of greenhouse gas emissions is likely to reduce the loss of snow, which is vital to society in the dry Western United States.
机译：这项工作分析了美国西部一组AR4模型的雪水高度变化。结果以雪水当量（SWE）和雪水量（SWV）表示，雪水当量（SWE）是融化时的积雪深度，雪水量是指定区域的SWE总体积。在整个研究区域内，从1905年到25年到1980-99年间，总SWV下降了大约22％，这在观测值的范围内。二十一世纪中叶的A1b和B1情景的结果都表明，在较低海拔高度，SWE几乎全部消失。但是，SWV的最大损失接近1800 m。此外，A1b情景的总SWV损失约为63％，而中度B1情景的总SWV损失约为49％。因此，减少温室气体排放可能会减少积雪的损失，这对美国西部干旱地区的社会至关重要。

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