Changes and Comparison of Temperature and Humidity at Different Levels Over High Latitudes of Asia
|School||Hunan Normal University|
|Keywords||Asian high latitudes Different heights Temperature Humidity Temporal and spatial variation|
The past one hundred years, the global climate is changing rapidly to more than its natural rate. The impact of this change to the human is very profound. Changes in regional climate characteristics, response mechanisms and their impact in the context of global climate change, has become the focus of human attention. High latitudes in Asia as the birthplace of the cold air in Asia, climate change is a significant climate impact of the East Asian low-latitude countries and regions. According to the 946 ground meteorological stations in the high latitudes of Asia 1973-2005 monthly temperature and precipitation data, and NOAA center provided by the temperature and humidity data, analysis based on linear regression, wavelet analysis method nearly 33a to Asia high latitudes temperature, humidity spatial and temporal variation, and comparative analysis of the ground, 850hpa, 500hpa of temperature and humidity changes. Major findings include: (1) through the analysis of the surface temperature data length is greater than the trend of 20 years, 546 years the average temperature of the weather station, come 33a to the Asian high latitudes in most parts of the multi-year average temperature rising trend, only a handful of stations, there is a downward trend. 105 ° E-110 ° E between 55 ° N-65 ° N latitudes is warming the fastest growing regions, while the average annual high temperature southwestern part of the East Siberian region and the temperature of the Arctic Ocean coast decreasing. Seasonal variation trend, in January, warming to October. In addition, in time, in the Asian LATITUDES 33a, there is always a cycle of 6-8a. (2) high-latitude regions of Asia 850hpa years the average temperature of the purpose of their spatial trend, the region of the western and northern parts showed warming trends, warming faster region appeared in the northwest part of the region of the Arctic Ocean coast, but in the mountains and southeast of the southern Siberia Ministry of the Okhotsk Sea coast area showing a cooling trend, and the cooling zone temperature changes faster. In terms of seasonal distribution, in addition to the west of Lake Baikal, 80 ° E-115 ° E, a small area in the south of 60 ° N four months are cooling trend mainly, most of the other regions in January showing a warming trend in July, October, compared with the cooling trend, and the maximum cooling rate in July. Showing the state of South High North (3) Asia high latitude regions 500hpa of years of the spatial distribution of the overall average temperature, minimum temperature in the middle of the East Siberian mountains; terms of its spatial trend, the region's most showed warming trends Only the southwestern and southeastern parts of the region showing a cooling trend. 850hpa season changes, in addition to the 80 ° E-120. E small part of the area south of 60 ° N four months are cooling trend mainly outside, most of the other areas showing a warming trend in January, April, July and October by the cooling trend for the Lord, and the maximum cooling rate in July. (4) changes in the high latitudes in Asia for many years average precipitation performance space for something wet and dry Central, South wet North features dry. Seasonal distribution, in January, April, October, southeast and west precipitation, less precipitation in the middle of July, but is manifested in the south than in the north trend. January the western precipitation performance in April for a decreasing trend, while in July, most of the region's precipitation shows an increasing trend. Time, the annual average precipitation of the high latitudes of Asia there is always quasi 6-8a, and quasi-12a characteristic time scales, time scales where the quasi-12a in the central region 90 years ago less obvious. (5) the the Asian high latitudes 850hpa years average than wet spatial distribution of high value centers in the west of Lake Baikal. Years average than wet the trend, in addition to the South Siberian mountains years on average than wet showing a decreasing trend, both east and west than the wet trend, in which the the eastern maximum increase of 0.02 g / kg · 10a. Seasonal distribution, January smaller than wet, July larger than wet. In addition, the region in January than wet almost all showed increasing trend, and the rapid changes; July, parts of the West Siberian plain central mountains of southern Siberia years average wet performance decreased, eastern and central most areas than wet performance is an increasing trend. (6) the high latitudes of Asia 500hpa years average than wet spatial distribution similar to 850hpa. Terms, compared with 850hpa, spatial variation trend central than the wet areas where reductions range has increased, but the magnitude of change to reduce. From the seasonal variation trend, in addition to parts of the west and northeast of Lake Baikal showing specific humidity decreased in January, other regions more than wet the increasing trend in April, rapid changes in specific humidity in July only the mountainous southern Siberia and central parts of the West Siberian Plain specific humidity decreases, east and north of the specific humidity compared to the increase.