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. The important roles of the Tibetan Plateau (TP) atmospheric boundary layer (ABL) in climate,weather, and air quality have long been recognized, but little is known about the TP ABLclimatological features and their west–east discrepancies due to the scarce data in the westernTP. Based on observational datasets of intensive sounding, surface sensible heat flux, solar radiation, and soil moisture from the Third Tibetan Plateau Atmospheric Scientific Experiment (TIPEX-III) and theroutine meteorological-operational-sounding and ground-based cloud cover datasets in the TibetanPlateau for the period 2013–2015, we investigate the west–east differences in summer ABLfeatures over the TP and the associated influential factors for the first time. It is found that the heights of both the convective boundary layer (CBL) and the neutral boundary layer (NBL) exhibit a diurnalvariation and a west–east difference in the TP, while these features are not remarkable for thestable boundary layer (SBL). Moreover, the ABL shows significant discrepancies in the amplitude ofthe diurnal variation and the persistent time of the development between the eastern and westernTP. In the early morning (08:00 BJT, Beijing time), the ABL height distribution is narrow, with a mean heightbelow 450 m a.g.l. (above ground level) and a small west–east difference. The SBL observedat this moment accounts for 85 % of the total TP ABL. There is a wide distribution in the ABLheight up to 4000 m a.g.l. and a large west–east difference for the total ABL height atnoon (14:00 BJT), with a mean height above 2000 m a.g.l. in the western TP and around1500 m a.g.l. in the eastern TP. The CBL accounts for 77 % of the total TP ABL atthis moment, with more than 50 % of the CBL above 1900 m a.g.l. In the late afternoon(20:00 BJT), the CBL and SBL dominate the western and eastern TP, respectively, which results in alarger west–east difference of 1054.2 m between the western and eastern TP. The high ABLheight in a cold environment over the western TP (relative to the plain areas) is similar to thatin some extreme hot and arid areas such as Dunhuang and Taklimakan deserts. In general, for thewestern (eastern) TP, there is low (high) total cloud coverage, with large (small) solar radiationat the surface and dry (wet) soil. These features lead to high (low) sensible heat flux and thuspromote (inhibit) the local ABL development. This study provides new insights for west–eaststructures of the summer ABL height, occurrence frequency, and diurnal amplitude over the TPregion and the associated reasons.

Characteristics of the summer atmospheric boundary layer height over the Tibetan Plateau and influential factors