| Analysis of change characteristic and influence factors on ground temperature in Hexi corridor eastern |
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| DOI：10.7606/j.issn.1000-7601.2014.01.037 |
| Key Words: eastern Hexi corridor ground surface temperature variation characteristics meteorological factor |
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| Abstract: |
| Using the observation data of ground surface temperature, annual temperature, evaporation, precipitation, relative humidity and wind speed etc in four meteorological stations of eastern Hexi corridor in recent 50 years, systematically analyzed the meteorological factors that influenced the
ground surface temperature by the standardized regressive coefficient in multi-linear regression. The result showed that: Ground surface temperature in low altitude plain areas is bigger than in high altitude mountain areas in eastern Hexi corridor, because of impact by the weather system, landform and altitude. Ground temperature of year and age assume very significant increasing trend in every region. Time series of ground temperature have six to nine years quasi-periodic variation. Variation trend of ground temperature in each season also assume increasing trend, rising rates in spring and summer are greater than in autumn and winter. Monthly variation of ground temperature is more consistent. Annual extreme highest and lowest ground temperature also assume increasing trend, ri
sing rates of lowest ground temperature is bigger than of extreme highest ground temperature, so contributes to annual ground temperature increasing in winter is bigger than in summer. Main influencing factors of annual ground temperature are minimum temperature and mean temperature, the second are precipitation, average wind speed and relative humidity, effect of maximum temperature is weaker and effect of evaporation is the weakest in Hexi corridor eastern. Ground temperature is positively correlated with average temperature, maximum temperature and minimum temperature. Ground temperature is negatively correlated with precipitation, relative humidity and average wind speed. Ground temperature is no correlation with evaporation. Main influence factors of ground temperature are different in every region. |
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