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• W345309026 abstract "Based on the ensemble spread, a methodology of measuring uncertainty in weather forecasts, the temperature trend and spread have been estimated using five radiosonde data sets (HadAT2, RATPAC, IUK, RAOBCORE and RICH), three Microwave Sounding Units (MSU: STAR, RSS and UAH) retrieved productions and seven reanalysis products (NCEP-NCAR, NCEP-DOE, NCEP-CFSR, MERRA, JRA-25, ERA-40, ERAinterim). The results show that the magnitude of warming or cooling depends on the data sources, atmospheric heights, and geophysical latitudes. For global mean temperature, the trend is approximately 0.2 K/decade in the troposphere and −0.8 K/decade in the stratosphere. The spread increases significantly with atmospheric height from approximately 0.1 K/decade at 850hPa to 0.8 K/decade at 30hPa. In the stratosphere, pronounced evidence was found that a cooler trend and a larger spread appear over the tropics-subtropics (40°S-40°N). There is very consistent for all datasets over the northern middle-high latitudes. However, the trend and spread shows a remarkably different feature in the three groups of datasets. The radiosonde has a larger (smaller) cooling trend magnitude and spread than the MSU (reanalysis) [e.g. reanalysis > radiosonde > MSU]. The cooling trend in NCEP-DOE and NCEP-NCAR (1.0 K/decade) is much lower than any of the other products (-0.3 ~ -0.7 K/decade) over the tropics. The spread in the reanalyses (0.35 K/decade) is around seven times greater than the value in the MSU (0.05 K/decade). The JRA25 shows a noticeable inconsistency compared to the other twelve datasets. In the troposphere, however, a warming trend increases with latitude from south to north with the warmest trend observed in the Arctic The spread increases in the opposing direction with the largest spread found in the Antarctic. It should be noted that the Antarctic shows a cooling trend in all MSUs, RICH, JRA25, MERRA and NCEP-CFSR datasets. The NCEP new reanalysis (e.g. NCEP-CFSR) shows the strongest warming trend in the tropics and the RAOBCORE is the warmest one in the Arctic. Height-latitude distribution of annual zonal-mean temperature trends (K/decade ) from 1989 onwards. Radiosonde: (a) HADAT2, (b) IUK, (c) RAOBCORE, (d) RATPAC, (e) RICH; Reanalysis: (f) NCEP-NCAR, (g) NCEP-DOE, (h) NCEP-CFSR, (i) ERA-40,(j) ERA-interim, (k) MERRA, (L) JRA-25. Shading indicated the statistical significance t-test at the 95% confident level Global Temperature on 850mb y = 0.0158x 0.2381 R = 0.5215 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 Merra ERA40 ERAim JRA25 NCEP-R1 NCEP-R2 CFSR HADAT2 RICH RAOBCORE RATPAC Model OBS Model+OBS Linear (Model+OBS) Global Temperature on 150mb y = -0.0133x + 0.2083 R = 0.1826 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 Merra ERA40 ERAim JRA25 NCEP-R1 NCEP-R2 CFSR HADAT2 RICH RAOBCORE RATPAC Model OBS Model+OBS Linear (Model+OBS) Global Temperature on 30mb y = -0.0575x + 0.8798 R = 0.6454 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 Merra ERA40 ERAim JRA25 NCEP-R1 NCEP-R2 CFSR HADAT2 RICH RAOBCORE RATPAC Model OBS Model+OBS Linear (Model+OBS) Vertical profile of the mean trends and spreads (K/decade) for the global mean temperature from 1989 onwards in (a) total twelve members of reanalyses and radiosondes, (b) seven reanalyses, (c) five radiosonde, (d) the difference between reanalyses and radiosonde -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 850 700 500 300 250 200 150 100 70 50 30 spread mean Reanalyses +Radiosonde -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 850 700 500 300 250 200 150 100 70 50 30" @default.
• W345309026 created "2016-06-24" @default.
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• W345309026 date "2010-12-01" @default.
• W345309026 modified "2023-09-23" @default.
• W345309026 title "Uncertainties Evaluation of Temperature Trends from Multiple Radiosondes, Microwave Sounding Units and Reanalyses Products" @default.
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