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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Ground-Based Water Vapor Retrieval in Antarctica: An Assessment
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Ground-Based Water Vapor Retrieval in Antarctica: An Assessment

机译：南极地基水蒸气反演：一项评估

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The atmospheric water vapor is an important indicator of the Earth's climate state and evolution. We therefore aimed at calculating the content and long-term variation of the precipitable water vapor at five coastal Antarctic stations, i.e., Casey, Davis, Mawson, McMurdo, and Mario Zucchelli. To do that, we processed the 12-year time series of GPS and radiosounding (RS) observations acquired at those stations, with the purpose of ensuring the utmost accuracy of the results adopting homogeneous, consistent, and up-to-date processing strategies for both data sets. Using the two fully independent techniques, rather consistent contents and seasonal variations of precipitable water were detected, mainly ranging from 1 (Austral winter) to 10 mm (Austral summer). At each site, correlation coefficients varying from 0.86 to 0.91 were found between the GPS and RS time series, with mean discrepancies 0.75 mm. There is no clear indication regarding the possible dry or wet biases of one technique with respect to the other, with only a notable GPS wet bias identified at Mawson and a dry bias at Casey that, nevertheless, correspond to an average difference of 1 mm on the two series; the biases at the other sites are much smaller. Although extremely small, i.e., ranging from −0.03 to 0.04 mm/year, the linear trends of the series are not always consistent in sign. In accordance with the major climate models, the RS linear trends are mostly positive, whereas depending on the site, GPS exhibits a (very small) decrease or increase in water vapor.
机译：大气中的水蒸气是地球气候状态和演变的重要指标。因此，我们的目的是计算五个沿海南极站（即凯西，戴维斯，莫森，麦克默多和马里奥·祖谢利）的可沉淀水汽含量和长期变化。为此，我们处理了在这些站获得的12年时间序列的GPS和无线电探测（RS）观测数据，目的是采用均一，一致且最新的处理策略来确保结果的最大准确性。两个数据集。使用两种完全独立的技术，可检测到的水含量和季节变化相当一致，主要范围从1（澳大利亚冬季）到10 mm（澳大利亚夏季）。在每个站点上，GPS和RS时间序列之间的相关系数在0.86至0.91之间变化，平均差异为0.75 mm。没有明显的迹象表明一种技术相对于另一种技术可能产生的干偏或湿偏，只有在莫森（Mawson）识别出显着的GPS湿偏，而在凯西（Casey）才发现干偏，这对应于1 mm的平均差两个系列；其他站点的偏差要小得多。尽管极小，即从-0.03到0.04 mm /年，但是该系列的线性趋势在符号上并不总是一致的。根据主要的气候模型，RS线性趋势大部分为正，而根据站点的不同，GPS表现出的水蒸气减少（非常小）增加。

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