Characteristics of the summer atmospheric boundary layer height over the Tibetan Plateau and influential factors
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Published:2021-04-06
Issue:7
Volume:21
Page:5253-5268
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Che Junhui,Zhao Ping
Abstract
Abstract. 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 ABL
climatological features and their west–east discrepancies due to the scarce data in the western
TP. 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 the
routine meteorological-operational-sounding and ground-based cloud cover datasets in the Tibetan
Plateau for the period 2013–2015, we investigate the west–east differences in summer ABL
features 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 diurnal
variation and a west–east difference in the TP, while these features are not remarkable for the
stable boundary layer (SBL). Moreover, the ABL shows significant discrepancies in the amplitude of
the diurnal variation and the persistent time of the development between the eastern and western
TP. In the early morning (08:00 BJT, Beijing time), the ABL height distribution is narrow, with a mean height
below 450 m a.g.l. (above ground level) and a small west–east difference. The SBL observed
at this moment accounts for 85 % of the total TP ABL. There is a wide distribution in the ABL
height up to 4000 m a.g.l. and a large west–east difference for the total ABL height at
noon (14:00 BJT), with a mean height above 2000 m a.g.l. in the western TP and around
1500 m a.g.l. in the eastern TP. The CBL accounts for 77 % of the total TP ABL at
this 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 a
larger west–east difference of 1054.2 m between the western and eastern TP. The high ABL
height in a cold environment over the western TP (relative to the plain areas) is similar to that
in some extreme hot and arid areas such as Dunhuang and Taklimakan deserts. In general, for the
western (eastern) TP, there is low (high) total cloud coverage, with large (small) solar radiation
at the surface and dry (wet) soil. These features lead to high (low) sensible heat flux and thus
promote (inhibit) the local ABL development. This study provides new insights for west–east
structures of the summer ABL height, occurrence frequency, and diurnal amplitude over the TP
region and the associated reasons.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference69 articles.
1. Blay-Carreras, E., Pino, D., Vilà-Guerau de Arellano, J., van de Boer, A., De Coster,
O., Darbieu, C., Hartogensis, O., Lohou, F., Lothon, M., and Pietersen, H.: Role of the residual
layer and large-scale subsidence on the development and evolution of the convective boundary
layer, Atmos. Chem. Phys., 14, 4515–4530, https://doi.org/10.5194/acp-14-4515-2014, 2014. 2. Bosveld, F. C., Baas, P., Steeneveld, G., Holtslag, A. A. M., Angevine, W. M., Bazile, E., Bruijn, E. I. F., Deacu, D., Edwards, J. M., Ek, M., Larson, V. E., Pleim, J. E., Raschendorfer, M., and Svensson, G.: The third GABLS intercomparison case for evaluation studies of boundary-layer models, Part B: Results and process understanding, Bound.-Lay. Meteorol., 152, 157–187, https://doi.org/10.1007/s10546-014-9919-1, 2014. 3. Brooks, I. M. and Rogers, D. P.: Aircraft observations of the mean and turbulent
structure of a shallow boundary layer over the Persian Gulf, Bound.-Lay. Meteorol., 95, 189–210,
https://doi.org/10.1023/A:1002623712237, 2000. 4. Chen, S. S. and Houze, R. A.: Diurnal variation and life-cycle of deep convective
systems over the tropical Pacific warm pool, Q. J. Roy. Meteor. Soc., 123, 357–388,
https://doi.org/10.1002/qj.49712353806, 1997. 5. Chen, X. L., Juan, A. Añel., Su, Z. B., Laura, de. La. Torre., Hennie, Kelder.,
Jacob, van. Peet., and Ma, Y. M.: The deep atmospheric boundary layer and its significance to the
stratosphere and troposphere exchange over the Tibetan Plateau, PLoS. ONE, 8, e56909,
https://doi.org/10.1371/journal.pone.0056909, 2013.
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