Air-Broadened Half-Widths of the 22-and 183-GHz Water-Vapor Lines

作者：Payne Vivienne H^*; Delamere Jennifer S; Cady Pereira Karen E; Gamache Robert R; Moncet Jean Luc; Mlawer Eli J; Clough Shepard A

来源：IEEE Transactions on Geoscience and Remote Sensing, 2008, 46(11): 3601-3617.

DOI：10.1109/TGRS.2008.2002435

• Microwave radiometry
• satellite applications
• water-vapor absorption
• water-vapor retrieval

/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.

• 出版日期2008-11