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首页> 外文期刊>Atmospheric chemistry and physics >Precipitation isoscape of high reliefs: interpolation scheme designed and tested for monthly resolved precipitation oxygen isotope records of an Alpine domain
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Precipitation isoscape of high reliefs: interpolation scheme designed and tested for monthly resolved precipitation oxygen isotope records of an Alpine domain

机译：高浮雕的降水等值线：插值方案设计和测试用于高山域每月解析的降水氧同位素记录

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Stable oxygen isotope composition of atmospheric precipitation (δsup18/supOsubp/sub) was scrutinized from 39 stations distributed over Switzerland and its border zone. Monthly amount-weighted δsup18/supOsubp/sub values averaged over the 1995–2000 period showed the expected strong linear altitude dependence (?0.15 to ?0.22‰ per 100 m) only during the summer season (May–September). Steeper gradients (~ ?0.56 to ?0.60‰ per 100 m) were observed for winter months over a low elevation belt, while hardly any altitudinal difference was seen for high elevation stations. This dichotomous pattern could be explained by the characteristically shallower vertical atmospheric mixing height during winter season and provides empirical evidence for recently simulated effects of stratified atmospheric flow on orographic precipitation isotopic ratios. This helps explain "anomalous" deflected altitudinal water isotope profiles reported from many other high relief regions. Grids and isotope distribution maps of the monthly δsup18/supOsubp/sub have been calculated over the study region for 1995–1996. The adopted interpolation method took into account both the variable mixing heights and the seasonal difference in the isotopic lapse rate and combined them with residual kriging. The presented data set allows a point estimation of δsup18/supOsubp/sub with monthly resolution. According to the test calculations executed on subsets, this biannual data set can be extended back to 1992 with maintained fidelity and, with a reduced station subset, even back to 1983 at the expense of faded reliability of the derived δsup18/supOsubp/sub estimates, mainly in the eastern part of Switzerland. Before 1983, reliable results can only be expected for the Swiss Plateau since important stations representing eastern and south-western Switzerland were not yet in operation.
机译：从分布在瑞士及其边界地区的39个观测站对大气降水（δ 18 O p ）的稳定氧同位素组成进行了研究。 1995-2000年期间的月平均加权δ 18 O p 值显示出预期的高度线性高度相关性（每100 m约为0.15至0.22＆permil）。仅在夏季（5月至9月）期间。在低海拔带的冬季观察到陡峭的坡度（〜0.56至0.60 permil;每100 m），而在高海拔站几乎没有观察到任何海拔差异。这种二分模式可以通过冬季冬季特征性的垂直大气混合高度较浅来解释，并为最近模拟的分层大气流量对地形降水同位素比的影响提供了经验证据。这有助于解释从许多其他高浮雕地区报告的“异常”偏转的垂直水同位素剖面。研究区域1995-1996年间每月δ 18 O p 的网格和同位素分布图。所采用的插值方法既考虑了可变混合高度，又考虑了同位素消失率的季节性差异，并将其与残余克里金法相结合。提出的数据集允许以每月分辨率对δ 18 O p 进行点估计。根据对子集执行的测试计算，该双年度数据集可以保真度扩展到1992年，而减少了子集的数据集甚至可以扩展回1983年，但代价是派生的δ 18的可靠性下降。 sup> O p 估计，主要在瑞士东部。在1983年之前，只有代表瑞士东部和西南部的重要站点尚未运行，因此对于瑞士高原只能获得可靠的结果。

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