A parameterized yet accurate model of ozone and water vapor transmittance in the solar-to-near-infrared spectrum
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- 作者：Weiyi Liu (1)
Jinhuan Qiu (1) - 关键词：parameterization ; transmittance ; atmospheric absorption
- 刊名：Advances in Atmospheric Sciences
- 出版年：2012
- 出版时间：May 2012
- 年：2012
- 卷：29
- 期：3
- 页码：599-610
- 全文大小：604KB
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Jinhuan Qiu (1)
1. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China - ISSN：1861-9533
文摘
A parameterized transmittance model (PTR) for ozone and water vapor monochromatic transmittance calculation in the solar-to-near-infrared spectrum 0.3- μm with a spectral resolution of 5 cm was developed based on the transmittance data calculated by Moderate-resolution Transmittance model (MODTRAN). Polynomial equations were derived to represent the transmittance as functions of path length and airmass for every wavelength based on the least-squares method. Comparisons between the transmittances calculated using PTR and MODTRAN were made, using the results of MODTRAN as a reference. Relative root-mean-square error (RMSre) was 0.823% for ozone transmittance. RMSre values were 8.84% and 3.48% for water vapor transmittance ranges of 1-1×108 and 1-1×10, respectively. In addition, the Stratospheric Aerosol and Gas Experiment II (SAGEII) ozone profiles and University of Wyoming (UWYO) water vapor profiles were applied to validate the applicability of PTR model. RMSre was 0.437% for ozone transmittance. RMSre values were 8.89% and 2.43% for water vapor transmittance ranges of 1-1×108 and 1-1×10, respectively. Furthermore, the optical depth profiles calculated using the PTR model were compared to the results of MODTRAN. Absolute RMS errors (RMSab) for ozone optical depths were within 0.0055 and 0.0523 for water vapor at all of the tested altitudes. Finally, the comparison between the solar heating rate calculated from the transmittance of PTR and Line-by-Line radiative transfer model (LBLRTM) was performed, showing a maximum deviation of 0.238 K d (6% of the corresponding solar heating rate calculated using LBLRTM). In the troposphere all of the deviations were within 0.08 K d. The computational speed of PTR model is nearly two orders of magnitude faster than that of MODTRAN.