Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3561-9 |
How accurately do we know the temperature of the surface of the earth? | |
Lovejoy, S. | |
2017-12-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | The earth's near surface air temperature is important in a variety of applications including for quantifying global warming. We analyze 6 monthly series of atmospheric temperatures from 1880 to 2012, each produced with different methodologies. We first estimate the relative error by systematically determining how close the different series are to each other, the error at a given time scale is quantified by the root mean square fluctuations in the pairwise differences between the series as well as between the individual series and the average of all the available series. By examining the differences systematically from months to over a century, we find that the standard short range correlation assumption is untenable, that the differences in the series have long range statistical dependencies and that the error is roughly constant between 1 month and one century-over most of the scale range, varying between +/- 0.03 and +/- 0.05 K. The second part estimates the absolute measurement errors. First we make a stochastic model of both the true earth temperature and then of the measurement errors. The former involves a scaling (fractional Gaussian noise) natural variability term as well as a linear (anthropogenic) trend. The measurement error model involves three terms: a classical short range error, a term due to missing data and a scale reduction term due to insufficient space-time averaging. We find that at 1 month, the classical error is ae +/- 0.01 K, it decreases rapidly at longer times and it is dominated by the others. Up to 10-20 years, the missing data error gives the dominate contribution to the error: 15 +/- 10% of the temperature variance; at scales > 10 years, the scale reduction factor dominates, it increases the amplitude of the temperature anomalies by 11 +/- 8% (these uncertainties quantify the series to series variations). Finally, both the model itself as well as the statistical sampling and analysis techniques are verified on stochastic simulations that show that the model well reproduces the individual series fluctuation statistics as well as the series to series fluctuation statistics. The stochastic model allows us to conclude that with 90% certainty, the absolute monthly and globally averaged temperature will lie in the range -0.109 to 0.127 A degrees C of the measured temperature. Similarly, with 90% certainty, for a given series, the temperature change since 1880 is correctly estimated to within +/- 0.108 of its value. |
英文关键词 | Global temperature Uncertainty Scaling Stochastic modelling |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000415579000027 |
WOS关键词 | FRACTAL CHARACTERIZATION ; CLIMATE ; MACROWEATHER ; DEPENDENCE ; NETWORK |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36131 |
专题 | 气候变化 |
作者单位 | McGill Univ, Dept Phys, 3600 Univ St, Montreal, PQ H3A 2T8, Canada |
推荐引用方式 GB/T 7714 | Lovejoy, S.. How accurately do we know the temperature of the surface of the earth?[J]. CLIMATE DYNAMICS,2017,49. |
APA | Lovejoy, S..(2017).How accurately do we know the temperature of the surface of the earth?.CLIMATE DYNAMICS,49. |
MLA | Lovejoy, S.."How accurately do we know the temperature of the surface of the earth?".CLIMATE DYNAMICS 49(2017). |
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