AR ID METEOROLOGY 000, ,, , 30 E, , , m 14 hm 2 ( m ), , km. Vol. 26 No. 2 June, 2008 : P463.

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1 : (2008) AR ID METEOROLOGY Vol. 26 No. 2 June, , 2, 1, 2, 1, 2, 1, 2, 1, 2 (, ; 2., ) :, , MJ /m 2, 2. 7, 9%, 3. 7 m / s 0. 9,, ,, : ; ; ; : P : A 4. 5 m 2, 2 000,,,,, , 30 E, N m ( ),, [ 1 ] mm, 71%, h,, SO 2 NO x 2. 0 m / s, TSP [ 2 ] 25 km, [ 3 ], 1988, 1 ; , ,,, 1,, 2, 7 km, m m, m 14 hm 2 ( m ) ( m ), ( m) 2 km, 11 km : ; : : (200701) : ( ),,,,. E - mail: dhlhs69@163. com

2 m in ( 0. 5 h 1 ) ; , ,, MJ /m 2, MJ /m 2, MJ /m 2,, ( 2), MJ /m 2, MJ /m 2, MJ /m :, ;,, Fig. 2 The total monthly solar radiation contrast in the front and on the roof ofmogao Grottoes and 2. 2 Gobi from Ap ril to December of , 31. 0, ; , 19. 1, 18. 7, : 1), ; 2),,,, 4,,, Fig. 1 The daily solar radiation contrast in the front and on the roof of Mogao Grottoes and Gobi on June 1, Fig. 3 The daily surface temperature comparison in the front and on the roof ofmogao Grottoes and Gobi on June 1, 2005

3 2 : Fig. 4 The monthly mean surface temperature comparison in the front, on the roof of Mogao Grottoes and Gobi from Ap ril to December of Fig. 6 Comparison of the monthly mean relative hum idity in the front, on the roof of Mogao Grottoes and Gobi from Ap ril to December of , 31%, 20%, 22%, 11% 9 % ; %, 30%, 31%, 9% 8%,, > > %, ( mm mm ),, , 4. 1 m / s, 3. 7 m / s, 0. 3 m / s; m / s, 4. 1 m / s, 0. 6 m / s ,,,,,, ( 8), Fig. 5 Comparison of the daily relative hum idity in the front, on the roof ofmogao Grottoes and Gobi on June 1, Fig. 7 Comparison of daily wind speed in the front, on the roof of Mogao Grottoes and Gobi on June 1, 2005

4 Fig. 8 Comparison of monthly mean wind speed in the front, on the roof of Mogao Grottoes and Gobi from Ap ril to December of Fig. 10 Comparison of monthly mean temperature in the front, on the roof of Mogao Grottoes and Gobi from Ap ril to December of ,, 23. 8, 23. 5, 23. 7, , 14. 7, 14. 8, 3 3,, , ; ,,, 12, , 16. 5, ; 6. 3, 5. 5, , 11. 0, 15. 8, , Fig. 9 Comparison of daily temperature in the front, on the roof ofmogao Grottoes and Gobi on June 1, Fig. 11 Comparison of monthly maximum and m inimum temperature in the front of Mogao Grottoes and Gobi from Ap ril to December of 2005

5 2 : ,, Fig. 12 Comparison of mean temperature daily range in the front and on the roof of Mogao Grottoes and Dunhuang in 2004, :,, 4. 8 : 3. 2, , 2. 4,, :,, 200 m,,,, 2. 4, (0. 8 ) ;,,, [ 4 ],, (1), , MJ /m 2, 2. 7, 9%, 3. 7 m / s 0. 9 m (2),, , 4. 8, : [ 1 ],,,. [ J ]., 1990 (1) : [ 2 ],,,. [ J ]., 2006, 25 ( 1 ) : [ 3 ]. [ J ]., 2006, 26 (10) : [ 4 ]. [M ]. :, ( 35 )

6 2 : 35 D ry In trusion Ana lysis of a Strong D ust Storm in Hex i Corr idor WANG Fucun 1, 2, SHAO L iang 3, GUO L iangcai 4, FU Youzhi 2, ZHANG Yue 5 (1. Key Laboratory of A rid C lim atic Change and R educing D isaster of Gansu Province, Institute of A rid M eteorology, CMA, Lanzhou , China; 2. Zhangye M eteorological B ureau of Gansu Province, Zhangye , China; 3. Lanzhou M eteorological B ureau of Gansu P rovince, L anzhou , China; 4. J iuquan M eteorological B ureau of Gansu P rovince, J iuquan , China; 5. Gaotai M eteorological S tation of Gansu Province, Gaotai , China) Abstract:By using the reanalysis data of NCEP (1 1 ), the dry intrusion characteristic of a strong dust storm p rocess occurred in the Hexi Corridor from Ap ril 9 to 10, 2006 was analyzed. The results show that the high potential vorticity, dry air from the upper level of troposphere extended downwards and southwards, which increased the vertical component of the vorticity on the steep iso - entropy p lane and p romoted the rap id development of the low level cyclone, boundary layer. Key words: strong dust storm; dry intrusion; potential vorticity; low level jet; convergence resulted in a low level jet and the intensive convergence in the ( 29 ) Con tra st Ana lysis of Env iron m en t Factors Influenc ing M icroclima te of M ogao Grottoes L I Hongshou 1, 2, WANG W anfu 1, 2, ZHANG Guobin 1, 2, Q IU Fei 1, 2, ZHAN Hongtao 1, 2 ( 1. The Conservation Institute of D unhuang A cadem y, D unhuang , China; 2. Key Scientific Research B ase of Conservation for A ncient M ural S tate A dm inistration for Cultural Heritage, D unhuang , China) Abstract:Based on the meteorological observations, the m icroclimate ofmogao Grottoes was analyzed from different temporal and spa2 tial scales. Results show that the environment factors such as land form, water system and vegetation have some important influence on the m icroclimate there. The small landform structure ofmogao Grottoes and its water system have obvious influence on the wind speed, hum idity, temperature and solar radiation. Comparing the monthly mean values of meteorological factors in the front and on the roof of Mogao Grottoes from Ap ril to December of 2005, the solor radiation, surface temperature and wind speed decreased MJ /m 2, 2. 7 and 3. 7 m / s, respectively, and the relative hum idity increased 9%, the monthly mean temperature range in the front of Mogao Grottoes was 0. 9 less than that of Gobi. But for air temperature, it was chiefly controlled by large scale factors. The air temperature daily rang ofmogao Grottoes was 4. 8 less than that of Dunhuang in It s discovered that the environment elements of Mogao Grottoes formed more stable m icroclimate, and the stable m icroclimate was highly advantageous to the Mogao Grottoes cultural relic p reservation. It was the main reason why Mogao Grottoes had been standing there for thousands years. Key words: m icroclimate; water system; landform structure; contrast analysis