• 论文 •

### 地形对温、压、湿、风、降水和日照时数日变化影响的研究

1. 中央气象局气象科学研究院
• 出版日期:1981-10-15 发布日期:1981-10-15

### A STUDY OP THE INFLUENCE OF OROGRAPHY ON DIURNALCHANGES OF TEMPERATURE, PRESSURE, WIND VELO-CITY, PRECIPITATION, RELATIVE HIMIDITY ANDDURATION OF SUNSHINE

Lin Zhiguang

1. Aeademy of meteorological Science, Central Meteorological Bureau
• Online:1981-10-15 Published:1981-10-15

Abstract: In this paper, the following results are obtained:1. The diurnal temperature range is small on the summit of high mountains ’iutit is large in the valleys. Maximum temperature comes earlier on the summits than inthe valleys. i,e. about 13h on the summits and 14-15h in the valleys.2. The diurnal variation of precipitation on high mountain is just the contrary withthat of some large valleys: precipitation in daytime is l;:rger than that at night on thesummits, and precipitation in daytime is smaller than that at night Ln the hiurh valleys.And in large valleys of Xizhang and Yunnan, night rain follows the fine day. but inSichuan Basin, night rain follows the overcast day.3. The diurnal change of relative tumidity is very small on the summit, but is verylarge in the valley. Its maximum comes in the early morning and minimum appearsin the afternoon.4. On the top of a great mountain and in. large valley, the diurnal change of windvelocity are reverse too. In general, the maximum appears at night and the minimum inthe daytime on high mountain, while in the low valley, daytime maximum and niorhtminimum is observed. On Qing Zliang Plateau in winter and spring, the diurnal r. ngeui wind velocity is about 7? m/’sec which is the largest in our country.5. On mountain summit, two maxima and one minimum are observed on the diu-rnal curve of sunshine.- the maxima appear at U-10h, and 15-16h; minimum at about12-13h. In the valley, diurnal curve has one maximum only, it appears at about 9-10h in the dry season and about 12h in rainy season.6. On high mountains the diurnal curve of pressure have two abnormal waveswhich are different from that in the low land. In some high mountains, it has a singlewave only. We found that the diurnal range of pressure is proportional to the diurnalrange of temperature.