Abstract
Abstract. The Tibetan Plateau and nearby surrounding area (the Third Pole area) dramatically impacts the world’s environment and especially controls climatic and environmental changes in China, Asia and even in the Northern Hemisphere. Supported by the Chinese Academy of Sciences (CAS) and some international organizations, the Third Pole Environment (TPE) Programme is now under way. First, the background of the establishment of the TPE, the establishment and monitoring plans on long-term for the TPE and six comprehensive observation and study stations are introduced. Then the preliminary observational analysis results on atmosphere−land interaction are presented. The study on the regional distribution of land surface heat fluxes is of paramount importance over the heterogeneous landscape of the Third Pole area. A parameterization methodology based on satellite and in situ data is described and tested for deriving the regional surface heat fluxes (net radiation flux, soil heat flux, sensible heat flux and latent heat flux) over the heterogeneous landscape. As a case study, the methodology was applied to the whole Tibetan Plateau area. Eight images of MODIS data and four images of AVHRR data were used for the comparison among winter, spring, summer and autumn, and the annual variation analyses. The derived results were also validated by using the ‘‘ground truth’’ measured in the stations of the TPE. The results show that the derived surface heat fluxes in the four different seasons over the Tibetan Plateau area are in good agreement with the ground measurements. The results from AVHRR were also in agreement with MODIS. It is therefore concluded that the proposed methodology is successful for the retrieval of surface heat fluxes using the MODIS data, AVHRR data and in situ data over the Tibetan Plateau area.
Highlights
The Third Pole area is drawing increased attention among the international academic community
The characteristics of the land surface heat fluxes, the structure of the atmospheric boundary layer (ABL) and the characteristics of the atmospheric turbulent structure over the Tibetan Plateau area were derived using in situ data observed from the Third Pole Environment (TPE) in 2010
It was observed that above 9300 m a.m.s.l. the wind speed increased very rapidly and water vapour content (WV) dropped quickly. These high-gradient layers could be taken as the top of the CABL, or as an indication of the upper troposphere and the lowermost stratosphere (UTLS)
Summary
The Third Pole area (the Tibetan Plateau and nearby surrounding areas; Qiu, 2008) is drawing increased attention among the international academic community. A parameterization methodology based on satellite and in situ data will be described and tested for deriving the regional surface heat fluxes over the heterogeneous landscape of the Tibetan Plateau. The characteristics of the land surface heat fluxes, the structure of the atmospheric boundary layer (ABL) and the characteristics of the atmospheric turbulent structure over the Tibetan Plateau area were derived using in situ data observed from the TPE in 2010.
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More From: Proceedings of the International Association of Hydrological Sciences
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