The Effects of Different HITRAN Versions on Calculated Long-Wave Radiation and Uncertainty Evaluation

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Supported by the National Science and Technology Support Program of China (2007BAC03A01), National Natural ScienceFoundation of China (41075056), and National Basic Research and Development (973) Program of China (2011CB403405).

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  • Four editions of the High Resolution Transmission (HITRAN) databases (HITRAN96, HITRAN2K, HITRAN04, and HITRAN08) are compared by using a line-by-line (LBL) radiative model in the long-wave calculation for six typical atmospheres. The results show that differences in downward radiative fluxes between HITRAN96 and HITRAN08 at the surface can reach a maximum of 1.70 W m–2 for tropical atmospheres. The largest difference in heating rate between HITRAN96 and HITRAN08 can reach 0.1 K day–1 for midlatitude summer atmosphere. Uncertainties caused by line intensity and air-broadened halfwidths are also evaluated in this work using the uncertainty codes given in HITRAN08. The uncertainty is found to be 1.92 W m–2 for upward fluxes at the top of the atmosphere (TOA) and 1.97 W m?2 for downward fluxes at the surface. The largest heating rate caused by the uncertainty of line intensity and air-broadened half-width can reach 0.5 K day–1. The differences in optical depths between 1300 and 1700 cm?1 caused by different HITRAN versions are larger than those caused by the uncertainties in intensity and air-broadened half-width. This paper suggests that there is inaccurate representation of line parameters over some spectral ranges in HITRAN and more attention should be paid to these ranges in fields such as remote sensing.
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