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The Effects of Different HITRAN Versions on Calculated long-wave radiation and Uncertainty Evaluation

Acta meteorologica Sinica 2012年第3期26卷 389-398页

作者：卢鹏张华荆现文 Chinese Academy of Meteorological Sciences Nanjing University of Information Science & Technology Laboratory for Climate Studies China Meteorological Administration

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 half- widths 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 hMf-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.

关键词： High Resolution Transmission (HITRAN) long-wave radiation optical depth radiative flux,heating rate

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Investigating the Effects of Madden-Julian Oscillation on Climate Elements of Iran (1980-2020)

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Journal of Atmospheric Science Research 2023年第2期6卷 21-32页

作者： Kourosh Mohammadpour Zahra Hejazizadeh Hooshang Ghaemi Mohammad Salighe Department of Natural Geography Kharazmi UniversityTehran15447-33111Iran Tehran Institute of Meteorology and Atmospheric Sciences Tehran15447-33111Iran

The Madden-Julian Oscillation is one of the large-scale climate change patterns in the maritime tropics,with sub-seasonal time periods of 30 to 60 days affecting tropical and subtropical *** phenomenon can cause changes in various quantities of the atmosphere and ocean,such as pressure,sea surface temperature,and the rate of evaporation from the ocean surface in tropical *** this research,the effects of Madden-Julian fluctuation on the weather elements of Iran have been investigated with the aim of knowing the effects of different phases in order to improve the quality of forecasts and benefits in territorial *** first,the daily rainfall data of 1980-2020 were received from the National Meteorological Organization and quality *** the Wheeler and Hendon method,the two main components RMM1 and RMM2 were analyzed,based on which the amplitude of the above two components is considered as the main indicator of the intensity and weakness of this *** index is based on the experimental orthogonal functions of the meteorological fields,including the average wind levels of 850 and 200 hectopascals and outgoing long wave radiation(OLR)between the latitudes of 20 degrees south and 20 degrees *** clustering of the 7-day sequence with a component above 1 was used as the basis for clustering all eight phases,and by calculating the abnormality of each phase compared to its long term in the DJF time frame,the zoning of each phase was produced *** the end,phases 1,2,7,8 were concluded as effective phases in Iran’s rainfall and phases 3,4,5,6 as suppressive phases of Iran’s rainfall.

关键词： Madden-Julian oscillation Tropical convection precipitation long-wave radiation Sub-seasonal oscillation

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