Air-Broadened Half-Widths of the 22- and 183-GHz Water-Vapor Lines
Air-Broadened Half-Widths of the 22- and 183-GHz Water-Vapor Lines
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22 GHz 和 183 GHz 水蒸气谱线的空气加宽半宽度
DOI：
10.1109/tgrs.2008.2002435
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发表时间：
2008
影响因子：
8.2
通讯作者：
S. Clough
中科院分区：
文献类型：
--
作者：
V. Payne;J. Delamere;K. Cady;R. Gamache;J. Moncet;E. Mlawer;S. Clough
通过比较俄克拉荷马州和阿拉斯加大气辐射测量站的地基辐射测量值和辐射传输模型MonoRTM，确定了22-和183-GHz水汽线的空气加宽半宽和相关的不确定性。使用测量得到的宽度值为0.0900 cm-1/atm，22 GHz线的不确定性为1.6%，183 GHz线的不确定性为0.0992 cm-1/atm，2.4%。还提出了这些线的光谱参数，从新的计算使用复杂的实施罗伯特-Bonamy理论（CRB）。空气展宽宽度的CRB值为0.0913 cm-1/atm，3%的不确定性和温度指数为0.755的22-GHz线和0.0997 cm-1/atm，3%的不确定性和温度指数为0.769的183-GHz线。从测量/模型比较得出的空气加宽半宽度值与新的CRB计算结果吻合得很好。对于MonoRTM的未来版本，将采用0.0900和0.0997 cm-1/atm的宽度值，22和183 GHz线路的温度依赖性分别为0.76和0.77。
Air-broadened half-widths of the 22- and 183-GHz water-vapor lines and associated uncertainties have been determined using comparisons between ground-based radiometric measurements from Atmospheric Radiation Measurement sites in Oklahoma and Alaska, and MonoRTM, a radiative transfer model. Values of the widths obtained using the measurements are 0.0900 cm-1/atm with 1.6% uncertainty for the 22-GHz line and 0.0992 cm-1/atm with 2.4% uncertainty for the 183-GHz line. Also presented are spectroscopic parameters for these lines from new calculations performed using the complex implementation of the Robert-Bonamy theory (CRB). The CRB values of the air-broadened widths are 0.0913 cm-1/atm with 3% uncertainty and a temperature exponent of 0.755 for the 22-GHz line and 0.0997 cm-1/atm with 3% uncertainty and a temperature exponent of 0.769 for the 183-GHz line. The values for the air-broadened half-widths derived from the measurement/model comparisons show good agreement with the new CRB calculations. For future versions of MonoRTM, width values of 0.0900 and 0.0997 cm-1/atm are to be adopted with temperature dependences of 0.76 and 0.77 for the 22- and 183-GHz lines, respectively.