[1]QIANG Fang,ZHANG Mingjun,WANG Shengjie,et al.Variation of Free-Air 0℃ Isotherm Height over Tomur Peak in the Tianshan Mountain, Xinjiang Uygur Autonomous Region[J].Research of Soil and Water Conservation,2016,23(01):325-331.
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Variation of Free-Air 0℃ Isotherm Height over Tomur Peak in the Tianshan Mountain, Xinjiang Uygur Autonomous Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
23
Number of periods:
2016 01
Page number:
325-331
Column:
Public date:
2016-02-28
- Title:
- Variation of Free-Air 0℃ Isotherm Height over Tomur Peak in the Tianshan Mountain, Xinjiang Uygur Autonomous Region
- Keywords:
- Tomur Peak; 0℃ isotherm height; runoff; surface temperature
- CLC:
- P427.2+5
- DOI:
- -
- Abstract:
- Based on monthly data in 2 radiosonde stations (Aksu and Yining) in summer during the period from 1986 to 2010 over south and north for Tomur Peak in Tianshan Mountain as well as runoff data in 14 hydrological stations during the period from 1986 to 2006, climate tendency rate and correlational analysis method were applied. Variation of free-air 0℃ isotherm height for twice a day (8:00 and 20:00 Beijing Time) in summer over south and north for Tomur Peak during the period from 1986 to 2010 was analyzed, as well as the response of runoff to free-air 0℃ isotherm height was examined. The result indicates that variation of free-air 0℃ isotherm height in summer over south and north for Tomur Peak during the period from 1986 to 2010 shows increase trend. Compared with the north, the increase trend in south of Tomur is significant, in which the linear tendency rate in south (Aksu) and north (Yining) are 1.99 m/a (p > 0.1) and 1.56 m/a (p > 0.1), respectively. The increase rate for Aksu and Yining at 20:00 (0.52 m/a and 0.37 m/a) is lower than that at 8:00 (3.46 m/a and 2.76 m/a), and the warming in colder condition is more significant than that in warmer condition which is consistent with surface meteorological observation. The correlation analysis between 0℃ isotherm height and runoff during the period from 1986 to 2006 shows positive correlation. The higher proportions of glacier melt supplement show higher correlation coefficients which are 0.79, 0.76 and 0.66, respectively, in three hydrologic stations (Pochengzi, Xiehela, and Xidaqiao) at 8:00, and are statistically significant at the 0.01 level. According to the 0.5°×0.5° gridded temperature dataset and free-air 0℃ isotherm height in each radiosonde station, the correlation between free-air 0℃ isotherm height and surface temperature is better in high altitude mountainous area. The variation of free-air 0℃ isotherm height in summer modifies the processes of freezing and thawing of cryosphere (glacier, snows and Permafrost)and influences on runoff.
- References:
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