An Analysis of Tropospheric Humidity Trends from Radiosondes
An Analysis of Tropospheric Humidity Trends from Radiosondes
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DOI：
10.1175/2009jcli2879.1
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发表时间：
2009-11
影响因子：
4.9
通讯作者：
M. McCarthy;P. Thorne;Holly A. Titchner
中科院分区：
文献类型：
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作者：
M. McCarthy;P. Thorne;Holly A. Titchner
摘要对探空仪的历史湿度观测资料进行了新的分析。对已知和未知的仪器和观测实践变化进行了评估，以评估其对长期趋势的偏差和不确定性的影响。数据的处理包括插值数据，以解决因缺少干燥日和寒冷温度事件而产生的已知采样偏差，对已知无线电探空仪模式变化进行初步调整，以及基于100个基于邻居的均匀化的更复杂的估计集合。在每个阶段，都对过程的影响和不确定性进行了量化。这一调整消除了欧洲和亚洲部分地区明显的干燥现象，并在昼夜观测的温度和特定湿度趋势之间引入了更大的一致性。地表的年际变率和趋势与独立的原位数据集很好地吻合，尽管相对湿度的时间序列之间存在一些明显的阶梯状差异。
Abstract A new analysis of historical radiosonde humidity observations is described. An assessment of both known and unknown instrument and observing practice changes has been conducted to assess their impact on bias and uncertainty in long-term trends. The processing of the data includes interpolation of data to address known sampling bias from missing dry day and cold temperature events, a first-guess adjustment for known radiosonde model changes, and a more sophisticated ensemble of estimates based on 100 neighbor-based homogenizations. At each stage the impact and uncertainty of the process has been quantified. The adjustments remove an apparent drying over Europe and parts of Asia and introduce greater consistency between temperature and specific humidity trends from day and night observations. Interannual variability and trends at the surface are shown to be in good agreement with independent in situ datasets, although some steplike discrepancies are apparent between the time series of relative humi...