Abstract
Over the last three decades, the Tibetan Plateau has exhibited a significant increase in air temperature and a significant decrease in wind speed. How the surface heat source has changed is an important issue in monsoon research. Based on routine meteorological data, this study investigates the differences between methods for estimating trends in surface sensible heat flux on the Tibetan Plateau for the period 1984–2006. One is a physical method based on micro-meteorological theory and experiments, and takes into account both atmospheric stability and thermal roughness length. The other approach includes conventional empirical methods that assume the heat transfer coefficient is a constant value or a simple function of wind speed. The latter method is used widely in climatologic studies. Results from the physical method show that annual mean sensible heat flux has weakened by 2% per decade, and flux seasonal mean has weakened by ∼2%–4% except in winter. The two commonly used empirical methods showed high uncertainties in heat flux trend estimates, although they produced similar climatologies. Annual mean heat flux has weakened by 7% per decade when a fixed transfer coefficient is used, whereas the trend is negligible when the transfer coefficient is assumed a function of wind speed. Conventional empirical methods may therefore misrepresent the trend in sensible heat flux.
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References
Flohn H. Large-scale aspects of the “summer monsoon” in south and east Asia. J Meteorol Soc Jpn, 1957, 35: 180–186
Ye D, Gao Y. The Meteorology of the Qinghai-Xizang (Tibet) Plateau (in Chinese), Beijing, Science Press, 1979. 278
He H, McGinnis J W, Song Z, et al. Onset of the Asian summer monsoon in 1979 and the effect of Tibetan Plateau. Mon Weather Rev, 1987, 115: 1966–1994
Yanai M, Li C, Song Z. Seasonal heating of the Tibetan Plateau and its effects on the evolution of the Asian summer monsoon. J Meteor Soc Jpn, 1992, 70: 319–351
Wu G X, Zhang Y S. Tibetan Plateau forcing and timing of the monsoon onset over South Asia and South China Sea. Mon Weather Rev, 1998, 126: 913–927
Zhao P, Chen L. Climate features of atmospheric heat source/sink over the Qinghai-Xizang Plateau in 35 years and its relation to rainfall in China. Sci China Ser D-Earth Sci, 2001, 44: 858–864
Qian Y, Zhang Y, Huang Y, et al. The effects of the thermal anomalies over the Tibetan Plateau and its vicinities on climate variability in China. Adv Atmos Sci, 2004, 21: 369–381
Duan A, Liu Y, Wu G. Heating status of the Tibetan Plateau from April to June and rainfall and atmospheric circulation anomaly over East Asia in midsummer. Sci China Ser D-Earth Sci, 2005, 48: 250–257
Chen L, Reiter E R, Feng Z. The atmospheric heat source over the Tibetan Plateau: May–August 1979. Mon Weather Rev, 1985, 113: 1771–1790
Feng Z, Reiter R E, Chen L. The atmospheric heat budget over the western part of the Tibetan Plateau during MONEX, 1979. Adv Atmos Sci, 1985, 2: 454–468
Liu X D, Chen B D. Climatic warming in the Tibetan Plateau during recent decades. Int J Climatol, 2000, 20: 1729–1742
Qin J, Yang K, Liang S L, et al. The altitudinal dependence of recent rapid warming over the Tibetan Plateau. Clim Change, 2009, 97: 321–327
Duan A, Wu G. Weakening trend in the atmospheric heat source over the Tibetan Plateau during recent decades. Part I: Observations. J Clim, 2008, 21: 3149–3164
Ye B, Yang D, Ding Y, et al. A bias-corrected precipitation climatology for China. J Hydrometeorol, 2004, 5: 1147–1160
Cressman G P. Improved terrain effects in barotropic forecasts. Mon Weather Rev, 1960, 88: 327–342
Chen W, Wong D. A preliminary study on the computational method of 10-day mean sensible heat and latent heat on the Tibetan Plateau. Collected works of the Qinghai-Xizang Plateau Meteorological Experiment (Series 2) (in Chinese). Beijing: Science Press, 1984. 35–45
Zhang J, Zhu B, Zhu F, et al. Advances in the Qinghai-Xizang Plateau Meteorology—The Qinghai-Xizang Plateau Meteorological Experiment (1979) and Research (in Chinese). Beijing: Science Press, 1988. 262
Li G, Duan T, Gong Y. The bulk transfer coefficients and surface fluxes on the western Tibetan Plateau. Chin Sci Bull, 2000, 45: 1221–1226
Li G, Duan T, Gong Y, et al. Estimates of the bulk transfer coefficients and surface fluxes over the Tibetan Plateau using AWS data. J Meteorol Soc Jpn, 2001, 79: 625–635
Zhao P, Chen L. Study on climatic features of surface turbulent heat exchange coefficients and surface thermal sources over the Qinghai-Xizang Plateau. Acta Meteorol Sin, 2000, 14: 13–29
Ma Y, Tsukamoto O, Wang J, et al. Analysis of aerodynamic and thermodynamic parameters on the grassy marshland surface of Tibetan Plateau. Prog Nat Sci, 2002, 12: 36–40
Yang K, Koike T, Yang D. Surface flux parameterization in the Tibetan Plateau. Bound-Layer Meteor, 2003, 116: 245–262
Li D, Zhang J, Wu H. A diagnostic study on surface sensible heat flux anomaly in summer over the Qinghai-Xizang Plateau (in Chinese). Plateau Meteorol, 1997, 16: 367–375
Ye D Z, Wu G X. The role of the heat source of the Tibetan Plateau in the general circulation. Meteorol Atmos Phys, 1998, 67: 181–198
Yang K, Qin J, Guo X F, et al. Method development for estimating sensible heat flux over the Tibetan Plateau from CMA data. J Appl Meteorol Clim, 2009, 48: 2474–2486
Paulson C A. The mathematical representation of wind speed and temperature profiles in the unstable atmospheric surface layer. J Appl Meteorol, 1970, 9: 857–861
Högström, U L F. Review of some basic characteristics of the atmospheric surface layer. Bound-Layer Meteor, 1996, 78: 215–246
Yang K, Koike T, Ishikawa H, et al. Turbulent flux transfer over bare soil surfaces: Characteristics and parameterization. J Appl Meteorol Clim, 2008, 40: 276–290
Yang K, Tamai N, Koike T. Analytical solution of surface layer similarity equations. J Appl Meteorol, 2001, 40: 1647–1653
Ma Y, Fan S, Ishikawa H, et al. Diurnal and inter-monthly variation of land surface heat fluxes over the central Tibetan Plateau area. Theor Appl Climatol, 2005, 80: 259–273
Monin A S, Obukhov A M. Basic laws of turbulent mixing in the atmosphere near the ground. Turdy Akad Nauk SSSR Geofiz Inst, 1954, 24: 163–187
Arya S P. Introduction to Micrometeorology. London: Academic Press, 1988. 307
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Yang, K., Guo, X. & Wu, B. Recent trends in surface sensible heat flux on the Tibetan Plateau. Sci. China Earth Sci. 54, 19–28 (2011). https://doi.org/10.1007/s11430-010-4036-6
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DOI: https://doi.org/10.1007/s11430-010-4036-6