| Analysis on change tendency of relative moisture index in northern piedmont of middle Tianshan mountain over recent 30 years |
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| DOI：10.7606/j.issn.1000-7601.2013.03.40 |
| Key Words: relative moisture index aridification climate trend Xinjiang |
| Author Name | Affiliation | | CAO Xing | Urumqi Meteorological Administration, Urumqi, Xinjiang
830002, China | | WANYu | Urumqi Meteorological Administration, Urumqi, Xinjiang
830002, China | | CUI Yuling | Urumqi Meteorological Administration, Urumqi, Xinjiang
830002, China | | CAI Xinting | Urumqi Meteorological Administration, Urumqi, Xinjiang
830002, China | | GONG Hengrui | Urumqi Meteorological Administration, Urumqi, Xinjiang
830002, China | | PU Zong-chao | Urumqi Meteorological Administration, Urumqi, Xinjiang
830002, China |
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| Abstract: |
| Based on monthly temperature and precipitation data at northemn piedmont of middle Tianshan mountain from 1981-2010, relative moisture index was determined through calculating potential evaporation by using Thornthwaite method. Abrupt change pattern and eyele of relative moisture index was
analyzed using Mann-Kendall and Morlet wavelet method. The results showed the precipitation was inereased spirally, its spatial distribution is uneven, and temperature showed significant increasing tendeney. Under context of global warming, potential evapotranspiration showed spiral as-cending trend with signifieant different spatial distribution(P<0.01). The potential evapotranspiration change pattern is same in different areas, basically they alternated in same orientation, increasing or decreasing in parallel. Relative mois-ture index decreased with negative trend from south to north, in rangeof-0.88~1.10. After entering 21st eentury, it showed an obvious climatic aridification tendency and autumn has fastest aridifieation rate. However it did not show sig-nificant abrupt change time zone. Different areas showed discrepaney in oscillatory cyele. 3~6 years had better consis-tency in oscillatory cycle. At same time, 7~8 years showed obvious low-frequency oscillatory cycle. |
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