Comparison of Ground-Based Millimeter-Wave Observations and Simulations in the Arctic Winter
Comparison of Ground-Based Millimeter-Wave Observations and Simulations in the Arctic Winter
复制标题
北极冬季地基毫米波观测与模拟的比较
DOI：
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发表时间：
2009
影响因子：
8.2
通讯作者：
M. Cadeddu
中科院分区：
文献类型：
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作者：
D. Cimini;F. Nasir;E. Westwater;V. Payne;D. Turner;E. Mlawer;M. Exner;M. Cadeddu
在2007年2月至3月举行的未充分探索波段辐射加热运动(RHUBC)期间，在阿拉斯加州巴罗的大气辐射测量计划现场运行了三个毫米波辐射计。这些辐射计包含位于183.31 GHz强水汽线周围的几个通道，这对于北极典型的非常干燥条件下的地面水汽测量至关重要。在积分水汽(IWV)含量非常低(<；2 mm)的条件下进行了同步无线电探空仪观测。对三种仪器的观测结果进行了比较，说明了它们不同的设计特点。定量地讨论了RHUBC期间三种仪器之间以及仪器与正演模式之间的总体一致性。总的来说，对几组通道对进行的仪器交叉验证表明，在总的预期不确定度范围内是一致的。仪器之间的一致性使得在这些干燥条件下IWV的测定范围在2%左右。这些数据集与使用无线电探空仪作为输入的正向模型模拟之间的比较显示，亮度-温度残差中的光谱特征，表明仪器与正向模型之间存在一定程度的不一致。正演模型误差最有可能的原因是探空仪湿度剖面中的系统误差。
During the Radiative Heating in Underexplored Bands Campaign (RHUBC), held in February-March 2007, three millimeter-wave radiometers were operated at the Atmospheric Radiation Measurement Program's site in Barrow, Alaska. These radiometers contain several channels located around the strong 183.31-GHz water vapor line, which is crucial for ground-based water-vapor measurements in very dry conditions, typical of the Arctic. Simultaneous radiosonde observations were carried out during conditions with very low integrated-water-vapor (IWV) content (< 2 mm). Observations from the three instruments are compared, accounting for their different design characteristics. The overall agreement during RHUBC among the three instruments and between instruments and forward model is discussed quantitatively. In general, the instrument cross-validation performed for sets of channel pairs showed agreement within the total expected uncertainty. The consistency between instruments allows the determination of the IWV to within around 2% for these dry conditions. Comparisons between these data sets and forward-model simulations using radiosondes as input show spectral features in the brightness-temperature residuals, indicating some degree of inconsistency between the instruments and the forward model. The most likely cause of forward-model error is systematic errors in the radiosonde humidity profiles.