Analysis on Micrometeorological Characteristic in the Surface Layer of Laohugou Glacier No.12 in Qilian Mountains

LI Jian;QIN Xiang;SUN Wei-Jun;ZHANG Ming-Jie;YANG Jun-Hua

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Plateau Meteorology
Plateau Meteorology ›› 2012, Vol. 31 ›› Issue (2) : 370-379.
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Analysis on Micrometeorological Characteristic in the Surface Layer of Laohugou Glacier No.12 in Qilian Mountains

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Abstract

The micrometeorological variation characteristics, such as temperature, rainfall, specific humility, air pressure, wind, sensible heat flux, latent heat flux and so on, are analyzed based on the observed meteorological data from September 1, 2009 to August 31, 2010, at the elevation of 4 550 m of the Laohugou Glacier No.12 in Qilian Mountains. Due to the influence of the glacier underlying surface, the rising rate of  hourly mean variations of temperature is larger than the decreasing rate, opposite to the seasonal variation. The phase variation of temperature is in advance of wind speed. Precipitation mainly concentrates from May to September, which is 68.1% of the annual amount.The mean wind speed is the largest in winter, the smallest in summer, and in spring it is above in autumn. The glacier wind is heavier than valley wind in spring and autumn, opposite to in summer. It governsin winter and plays an important role in energy exchanges in the land-surface process. Themajor portion of daily mean sensible heat flux is positive, and the latent heat flux is almost negative in all the year, which increase noticeably in the case of higher temperature and larger wind speed. The absolute values of sensible heat  and latent heat fluxes in summer are larger than in winter.

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Laohugou glacier No. / Surface layer / Micrometeorological / Glacier wind / Sensible and latent

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LI Jian , QIN Xiang , SUN Wei-Jun , ZHANG Ming-Jie , YANG Jun-Hua. Analysis on Micrometeorological Characteristic in the Surface Layer of Laohugou Glacier No.12 in Qilian Mountains. Plateau Meteorology. 2012, 31(2): 370-379

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