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Global Mean Tropospheric Temperature Trends Test during the Last 50 Years

Author: GaoXiaoRong
Tutor: DongWenJie；LiQingXiang
School: Lanzhou University
Course: Meteorology
Keywords: Troposphere Temperature changes Thin plate smoothing spline function lowess smooth
CLC: P467
Type: Master's thesis
Year: 2007
Downloads: 262
Quote: 0
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Abstract


Over the years, the use of radiosonde observations, satellite MSU data and reanalysis data, the researchers made a lot of upper-air temperature trend analysis, has achieved many important results. In the selection of high-altitude climate data, more dependent on global reanalysis data, but due to more complex analysis of data sources, analytical techniques vary assimilation, long sequence of non-uniformity problems. So far, the global high-altitude climate change is no consistent conclusions, especially conclusions difficult to convince a growing number of researchers reanalysis data, satellite remote sensing data. Therefore, the development and utilization of the upper air sounding data analysis of high-altitude climate change has always been a priority direction. Global radiosonde data IGRA (Integrated Global Radiosonde Archive), this paper developed by the U.S. National Climatic Data Center (NCDC) 1963-2006 a total of 44 years of monthly mean temperature data to study the level of global tropospheric temperature trend, combined with the NCEP, ECMWF reanalysis data and the Hadley Centre of the data sets, comparative analysis, so that the screening the IGRA analysis results the scientific and reliability of the global high-altitude temperature trend. The main conclusions of this article are as follows: 1) the average monthly temperature data IGRA, thin disk filter spline method (thin plate smoothing splines) developed a set of high quality global exploration air Wimbledon gridded data set IGRA Grid. 2) IGRA Grid data sets can truly reflect the global tropospheric temperature changes, certain scientific. 5 ° x 5 ° grid point data values ??missing data significantly better than HadAT2. Lower Tropospheric IGRA the Grid HadAT2, ERA-40 global annual average temperature change rate of close to similar trends; in the upper troposphere, IGRA Grid (1979-2006) and the NCEP / the DOE (R-2) of the temperature changes similar trend; in the lower stratosphere of 100hPa the IGRA Grid temperatures dropped rate slightly greater than HadAT2 significantly larger than the ERA-40, far less than the three NCEP / DOE (R-2). These conclusions strongly proved the reliability of the data set. 3) IGRA Grid data set of global high-altitude temperature trend detection: ① from of 1000hPa (near ground layer) up until 400hPa (middle troposphere), 1963 to 2006, the global annual average temperature increased by about 0.6 ℃ warming rate of 0.18 ± 0.02 ℃ / 10a, which 850hPa warming rate slightly larger; 100 hPa isobaric surface (lower stratosphere) temperature was a significant downward trend, the cooling rate of 0.3 to 0.5 ° C / 10. ② high northern latitudes, 1000,850 hPa pressure surface in winter rate was significantly greater than the rate of warming in summer, that nearly ground floor and lower troposphere winter warming trend is stronger than in the summer. 500hPa, the rate of warming in the summer was significantly greater than in winter.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Climatology > Climate change, historical climate
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