The Effect Of Observation Environment On Temperature In North China Plain Area

Based on the meteorological station's temperature data between 2005 and 2007 and the Meteorological offices and stations environment comprehensive research assessment material, both of them are provided by the China Meteorological Administration, the influence of the dominant land use type, the building area and the observed fields block areas on temperature measurement within 20kms from station are analyzed The main conclusions are as follows:1 The influence extent of the architectural environment on the temperature measurement within 20km surrounding the stations is studied by comparing the measurement temperature between the farmland stations and the residential stations.: (1) The temperatures on the residential stations are averagely higher than those on the farmland stations by 0.662℃. (2) The buildings near the stations have the maximum influence on the lowest temperature measurements and the minimum on the highest temperature measurements. (3) The order of the influence in different seasons is as winter>spring>autumn>summer. (4) The effect of buildings around the stations on the temperature measurements at different times in order are the 02:00>20:00>08:00>14:00. (5) The Tr-f of two stations increasing with an increase in proportion of land surface.2,Based on the former study, the impacts of construction zone area on temperature measurements is researched. The results indicate that (1) To the land use type of 5km scale and residential area of 5km～20km scale, the magnitudes of the influence fall in the range of 0.44～1.90℃and-0.04～1.08℃, respectively, which indicate that larger influence by land use type of 5km scale is found. (2) Tr-f is minimum at high temperature and maximum at low temperature within the same range. (3) With scale increase, Tr-f increase, but increase rate decrease. The closer to the residential areas, the greater influence is found.3,The study of influence on temperature measurements caused by building block and by the type station with the same scale of block area shows that:(1) the temperature of stations increase with the expanding of blocked area. Meanwhile, for two stations with different block size, their maximum temperature difference occurs at 20 o'clock. The magnitude of temperature difference of different block area among residential stations is greater than that among farmland stations. (2) The impact of shelter area on the station temperature in cropland area always show the feature that the radiation effect of local area is stronger than that of middling dimension area. While the effect of shelter area on the low station temperature in residential area show that the radiation effect of local area is stronger than that of middling dimension area, but local block is stronger than the radiation on the high temperature.(3)The influence of types of stations is greater than that by block size. With the block size increases, the impact of low-temperature measurements increases gradually, however, the influence by type of station decreases.