Estimate of atmospheric heat source over Tibetan Plateau and its uncertainties

doi:10.12006/j.issn.1673-1719.2018.111

Abstract

Abstract:

The atmospheric heat source (AHS) over Tibetan Plateau (TP) during 1980-2016 was calculated using four reanalysis data (NCEP/DOE, MERRA2, ERA-Interim and JRA-55 data), and the uncertainties was also discussed. The main conclusions are as follows: (1) Methods and data can both make deviation. Indirect method can not only get the whole layer of AHS, but also the vertical structure of AHS, while its estimation precision mainly depends on reanalysis data. (2) Compared with four reanalysis data, we found that adopting two methods with ERA-Interim data can get consistent inter-decadal variation of AHS over TP, while the AHS value calculated by direct method is greater than the indirect method. The results from four reanalysis data by indirect method obtained the obviously identical decadal variation during 1980-2016. (3) Positive AHS mainly distributed in the center and eastern of TP during March-August, and the vertical structure of AHS is “source-sink-source” from surface to high troposphere. (4) The results revealed that latent heat flux calculated by ERA-Interim data is stronger in the western and southern Gangdise, and is weaken in the south slope of Himalaya range.

Key words: Tibetan Plateau, Atmospheric heat source, Uncertainties, Direct method, Indirect method

Xiao-Qing LUO,Jian-Jun XU. Estimate of atmospheric heat source over Tibetan Plateau and its uncertainties[J]. Climate Change Research, 2019, 15(1): 33-40.

Figures/Tables 6

Fig. 1 Inter-decadal variation of atmospheric heat source based on direct method (a) and indirect method (b) using four reanalysis data over the Tibetan Plateau during 1980-2016

Fig. 2 Boxplot of atmospheric heat source based on direct method (a) and indirect method (b)

Fig. 3 March to August average of 500 hPa atmospheric heat source during 1980-2016 based on four reanalysis data

Fig. 4 March to August average of 850 hPa horizontal wind during 1980-2016 based on ERA-Interim data

Fig. 5 Vertical struction of atmospheric heat source, atmospheric moisture sink and their components based on four reanalysis data over Tibetan Plateau during 1980-2016

Fig. 6 Deviation of summer latent value between ERA-I and APHRODITE over Tibetan Plateau during 1980-2007

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