The bulk transfer coefficients and surface fluxes on the western Tibetan Plateau
- 56 Downloads
On the gradient observational data of the atmospheric surface layer from September 1997 to December 1998 collected by two sets of Automatic Weather Station (AWS) installed in Gaize and Shiquanhe on the western Tibetan Plateau, mean surface roughness lengths at the two stations above are determined to be 2.7 and 2.9 cm, respectively. The bulk transfer coefficients each day are computed by the profile-flux method, means of the bulk transfer coefficient for momentum (i.e. drag coefficient) in 1998 are 4.83×10−3 and 4.75×103 at the two stations. The surface fluxes of momentum, sensible heat and latent heat each day are further estimated by the bulk formulas, annual mean of these fluxes is 3.4×10−2 and 1.8×102N/m2, 73.1 and 67.2 W/m2, 15.4 and 2.9 W/m2, respectively. The diurnal and seasonal variations are obtained by a composite method and the relationships among the heat transfers between land and atmosphere, plateau monsoon and plateau rain season are also discussed.
Keywordswestern Tibetan Plateau AWS data surface roughness length bulk transfer coefficient surface flux
Unable to display preview. Download preview PDF.
- 1.Ye Duzheng, Gao Youxi, Qinghai-Xizang Plateau meteorology (in Chinese), Beijing: Science Press, 1979, 1–9.Google Scholar
- 2.Zhang Jijia, Zhu Baozheng, Zhu Fukang et al., Advances in Qinghai Xizang Meteorology (in Chinese), Beijing: Science Press, 1988, 14–89.Google Scholar
- 3.Yao Lanchang, Wang Anyu, Wang Qianqian et al., Study on mean atmospheric heat source over and around the Qinghai Xizang Plateau, Collected Works of the Qinghai Xizang Plateau Meteorological Science Experiment (Series 1) (in Chinese), Beijing: Science Press, 1984, 291–302.Google Scholar
- 4.Chen Wanlong, Weng Duming, Preliminary study on the computational method for the ten days sum of sensible and latent heat on the Qinghai-Xizang Plateau, Collected Works of the Qinghai-Xizang Plateau Meteorological Science Experiment (Series 2) (in Chinese), Beijing: Science Press 1984, 35–45.Google Scholar
- 5.Li Guoping, Duan Tingyang, Wan Jun et al., Determination of the drag coefficient over the Tibetan Plateau, Advances in Atmospheric Sciences. 1996, 13(4): 511.Google Scholar
- 6.Li Dongliang, Zhang Jijia, Wu Hongbao, A diagnostic study on the anomalous surface sensible heat on the Qinghai-Xizang Plateau, Plateau Meteorology (in Chinese), 1997, 16(4): 367.Google Scholar
- 7.Li Jialun, Hong Zhongxiang, Luo Weidong et al., A study of surface fluxes in Gaize area, Tibetan Plateau., Chinese Journal of Atmospheric Sciences (in Chinese), 1999,23(2): 142.Google Scholar