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首页> 外文期刊>Open Journal of Modern Hydrology >Spatial and Temporal Variation of Stable Isotopes in Precipitation across Costa Rica: An Analysis of Historic GNIP Records
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Spatial and Temporal Variation of Stable Isotopes in Precipitation across Costa Rica: An Analysis of Historic GNIP Records

机译：哥斯达黎加降水中稳定同位素的时空变化：GNIP历史记录的分析

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The location of Costa Rica on the Central American Isthmus creates unique microclimate systems that receive moisture inputs directly from the Caribbean Sea and the Pacific Ocean. In Costa Rica, stable isotope monitoring was conducted by the International Atomic Energy Agency and the World Meteorological Association as part of the worldwide effort entitled Global Network of Isotopes in Precipitation. Sampling campaigns were mainly comprised of monthly-integrated samples during intermittent years from 1990 to 2005. The main goal of this study was to determine spatial and temporal isotopic variations of meteoric waters in Costa Rica using historic records. Samples were grouped in four main regions: Nicoya Peninsula (d2H = 6.65d18O －0.13; r2 = 0.86); Pacific Coast (d2H = 7.60d18O + 7.95; r2 = 0.99); Caribbean Slope (d2H = 6.97d18O + 4.97; r2 = 0.97); and Central Valley (d2H = 7.94d18O + 10.38; r2 = 0.98). The water meteoric line for Costa Rica can be defined as d2H = 7.61d18O + 7.40 (r2 = 0.98). The regression of precipitation amount and annual arithmetic means yields a slope of ﹣1.6‰ d18O per 100 mm of rain (r2 = 0.57) which corresponds with a temperature effect of ﹣0.37‰ d18O/°C. A strong correlation (r2 = 0.77) of ﹣2.0‰ d18O per km of elevation was found. Samples within the Nicoya Peninsula and Caribbean lowlands appear to be dominated by evaporation enrichment as shown in d-excess interpolation, especially during the dry months, likely resulting from small precipitation amounts. In the inter-mountainous region of the Central Valley and Pacific slope, complex moisture recycling processes may dominate isotopic variations. Generally, isotopic values tend to be more depleted as the rainy season progresses over the year. Air parcel back trajectories indicate that enriched isotopic compositions both in Turrialba and Monteverde are related to central Caribbean parental moisture and low rainfall intensities. Depleted events appear to be related to high rainfall amounts despite the parental origin of the moisture.
机译：哥斯达黎加位于中美洲地峡上，形成了独特的微气候系统，可以直接从加勒比海和太平洋接收水分输入。在哥斯达黎加，国际原子能机构和世界气象协会进行了稳定的同位素监测，这是名为“全球降水同位素网络”的全球努力的一部分。采样活动主要包括1990年至2005年间的间歇年份中的月累计采样。本研究的主要目标是使用历史记录确定哥斯达黎加大气水的时空同位素变化。样本分为四个主要区域：尼科亚半岛（d2H = 6.65d18O －0.13; r2 = 0.86）;太平洋海岸（d2H = 7.60d18O + 7.95; r2 = 0.99）;加勒比坡度（d2H = 6.97d18O + 4.97; r2 = 0.97）;和中央谷地（d2H = 7.94d18O + 10.38; r2 = 0.98）。哥斯达黎加的水流线可以定义为d2H = 7.61d18O + 7.40（r2 = 0.98）。降水量和年度算术平均值的回归表明，每100毫米降雨的斜率为﹣1.6‰d18O（r2 = 0.57），这对应于﹣0.37‰d18O /°C的温度效应。发现每公里高程﹣2.0‰d18O具有很强的相关性（r2 = 0.77）。如d过量插值所示，尼科亚半岛和加勒比低地内的样品似乎以蒸发富集为主，尤其是在干旱月份，这可能是由于降水量少所致。在中部山谷和太平洋斜坡的山间区域，复杂的水分再循环过程可能是同位素变化的主要因素。通常，随着一年中雨季的进行，同位素值趋于耗尽。航空包裹的后退轨迹表明，图里亚尔巴和蒙特维德的富集同位素组成均与加勒比中部的父母亲湿度和低降雨强度有关。尽管父母亲是潮湿的，但干旱事件似乎与高降雨量有关。

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