Journal of Arid Meteorology Vol. 28 No. 4 Dec a

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1 Journal of Arid Meteorology Vol. 28 No. 4 Dec a ~ 2009 Mann - Kendall T - Yamamoto a ~ mm a 86% 3 a ~ ~ P A IPCC a 1906 ~ a /10 a ~ a 1961 ~ mm 3. 1 mm ~ ~ 59 cm ~ 0. 8 /10 a ~ Mann - Kendall T E - mail yctsc@ 126. com Journal of Arid Meteorology

2 Yamamoto ~ K = T T R 10 > R 10 > 10 K 1960 de Martonne 7 I dm = P / T ~ P T I dm de a Martonne 1975 ~ ~ ~ a /10 a Tab. 1 The decadal change of seasonal temperature 1990 anomaly in Yongchang county Unit 2000 ~ /10 a 0. 6 / 10 a a a ~ a 5 a /10 a /10 a a /10 a /10 a /10 a /10 a ~ a mm /10 a mm /10 a mm /10 a mm /10 a ~ 2009 ~ a 1982 Fig. 1 The annual change of average temperature mm 1983 ~ 1991 departure in Yongchang county during a 23 a a a a a 1 52 % a 412 Journal of Arid Meteorology

4 50 a 413 2 Fig. 2 The annual change of seasonal average temperature in Yongchang county during 1959-2009 1960 1990 1980 3 2000 ~ 2009 Fig.

2 The decadal change of seasonal precipitation mm anomaly percentage in Yongchang > 10 mm 4. 4 5. 1 1993 278. 5 1960-10. 0% 10. 0% - 20. 0% 10. 0% - 10. 1% mm 2002 269. 7 mm 2003 201.

3 4 50 a Fig. 2 The annual change of seasonal average temperature in Yongchang county during ~ 2009 Fig. 3 The yearly change of annual precipitation 4 in Yongchang county from 1959 to mm 80% Tab. 2 The decadal change of seasonal precipitation mm anomaly percentage in Yongchang > 10 mm % 10. 0% % 10. 0% % mm mm mm a 50 a a 1960 ~ ~ ~ ~ ~ % % % 30. 0% % % 10. 0% 0. 0% % 0. 9% % 20. 0% 10. 0% % 2. 0% 2000 ~ % 20. 0% 0. 0% 30. 0% 10. 7% Journal of Arid Meteorology

4 Fig. 4 The yearly change of seasonal precipitation in Yongchang from 1959 to a 5 5 a T 50 a 50 a t α = n 1 n 2 t 0 n 1 = 38 n 2 = 13 Mann - Kendall UF K 1959 ~ ~ UF α = U = ± t 0 = > UF K > U a 1996 UB 21 a UF UB α = ~ ~ Yamamoto SBN = > SBN = U = < UF UB a Journal of Arid Meteorology

5 4 50 a Fig. 5 The yearly abrupt change of temperature in Yongchang county from 1959 to 2009 Mann - Kendall 1959 ~ 2009 α = t α = > t α 1959 ~ ~ ~ ~ ~ ~ a T a a 1963 ~ ~ ~ M - K ~ 2009 α = a t α = n 1 n t 0 n n ~ ~ 2009 t 0 = > t α 1959 ~ ~ 2009 t 0 = t 0 < t α t Fig. 6 The yearly abrupt change of precipitation in Yongchang from 1959 to 2009 Yamamoto 3 Yamamoto Tab. 3 Yamamoto test of corresponding time to seek the 1963 truth or falsity of precipitation abrupt change year 1959 ~ a a M - K SBN Journal of Arid Meteorology

416 28 2. 4 1970 ~ 1978 1992 ~ 2007 50 a K 50 a Martonne 7 1 ~ 1. 5 1. 5 ~ 4. 0 I dm < 10 10 ~ 30 50 a 86% >30 7 3 a 1960 10 de Martonne 1990 1991 1963 1980 7 7 Fig.

6 ~ ~ a K 50 a Martonne 7 1 ~ ~ 4. 0 I dm < ~ a 86% > a de Martonne Fig. 7 The abrupt change trend of annual dryness in Yongchang from 1959 to a 109 d 158 d d d d d d d 2000 ~ d Fig. 8 The yearly change of frost - free 3 a 3 period in Yongchang ~ a 75% 50 a d 1998 ~ a d ~ ~ ~ d 20 d10 a Journal of Arid Meteorology

7 4 50 a 417 ~ ~ a J a ~ a 24 d a J a M J a J J a 1990 J a J a J J J J. J J J Climate Analysis in Recent 50 Years in Jinchang of Gansu Province TENG Shuichang 1 ZHAO Mingrui 2 ZHAI Cheng 3 YIN Yuchun 4 WANG Shengyuan 1 1. Yongchang Meteorological Station of Gansu Province Yongchang China 2. Minqin Meteorological Station of Gansu Province Minqin China 3. Jinchang Meteorological Bureau of Gansu Province Jinchang China 4. Wuwei Meteorological Bureau of Gansu Province Wuwei China Abstract The monthly seasonal and annual average temperature series precipitation in Yongchang during was analyzed using linear and polynomial regression methods. The results show that the average temperature presented increasing trend the abrupt change occurred in 1996 for temperature. The annual precipitation also showed increase trend since 1983 and during annual precipitation was mm more than climate average value and abrupt change occurred in 1984 for precipitation. In the 1960s and the early of 1990s it was relatively dry the driest year in history occurred in this period and during it was relatively humid the frost - free period prolonged since 1998 and it was gradually moving to the relatively warm and humid period. Key words annual average temperature annual rainfall dryness frost - free period variation Journal of Arid Meteorology

4期

中国农学通报 05,3(4):58-63 Chinese Agricultural Science Bulletin 近 50 年青海海南地区灾害性天气事件变化特征李金红, 丁生祥, 郭连云 ( 青海省海南州气象局, 青海共和 83099; 青海省同德县气象局, 青海同德 830) 摘要 : 为