ANALYSIS OF CLIMATE VARIABILITY IN THE JINSHA RIVER VALLEY

HE Yun-ling; ZHANG Yi-ping; WU Zhi-jie

doi:10.16555/j.1006-8775.2016.02.014

Abstract:

Monthly mean surface air temperatures and precipitation at 20 meteorological stations in the Jinsha River Valley (JRV) of southwest China were analyzed for temporal-spatial variation patterns during the period 1961-2010. The magnitude of a trend was estimated using Sen’s Nonparametric Estimator of Slope approach. The statistical significance of a trend was assessed by the MK test. The results showed that mean annual air temperature has been increasing by 0.08°C /decade during the past 50 years as a whole. The climate change trend in air temperature was more significant in the winter (0.13°C/decade) than in the summer (0.03°C/decade). Annual precipitation tended to increase slightly thereafter and the increasing was mainly during the crop-growing season. Both the greatest variation of the annual mean temperature and annual precipitation were observed at the dry-hot valley area of middle reaches. Significant warming rates were found in the upper reaches whereas the dry-hot basins of middle reaches experienced a cooling trend during the past decades. Despite of the overall increasing in precipitation, more obvious upward-trends were found in the dry-hot basins of middle reaches whereas the upper reaches had a drought trend during the past decades.

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HE Yun-ling, ZHANG Yi-ping, WU Zhi-jie. ANALYSIS OF CLIMATE VARIABILITY IN THE JINSHA RIVER VALLEY [J]. Journal of Tropical Meteorology, 2016, 22(2): 243-251, https://doi.org/10.16555/j.1006-8775.2016.02.014

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ANALYSIS OF CLIMATE VARIABILITY IN THE JINSHA RIVER VALLEY

School of Resources & Environment and Earth Science, Yunnan University, Kunming 650091 China

Rev Recd Date: 2016-03-02

Abstract: Monthly mean surface air temperatures and precipitation at 20 meteorological stations in the Jinsha River Valley (JRV) of southwest China were analyzed for temporal-spatial variation patterns during the period 1961-2010. The magnitude of a trend was estimated using Sen’s Nonparametric Estimator of Slope approach. The statistical significance of a trend was assessed by the MK test. The results showed that mean annual air temperature has been increasing by 0.08°C /decade during the past 50 years as a whole. The climate change trend in air temperature was more significant in the winter (0.13°C/decade) than in the summer (0.03°C/decade). Annual precipitation tended to increase slightly thereafter and the increasing was mainly during the crop-growing season. Both the greatest variation of the annual mean temperature and annual precipitation were observed at the dry-hot valley area of middle reaches. Significant warming rates were found in the upper reaches whereas the dry-hot basins of middle reaches experienced a cooling trend during the past decades. Despite of the overall increasing in precipitation, more obvious upward-trends were found in the dry-hot basins of middle reaches whereas the upper reaches had a drought trend during the past decades.

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ANALYSIS OF CLIMATE VARIABILITY IN THE JINSHA RIVER VALLEY

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