globalchange  > 气候减缓与适应
DOI: 10.1175/JCLI-D-17-0335.1
Scopus记录号: 2-s2.0-85028507742
论文题名:
Corrigendum: The effective number of spatial degrees of freedom of a time-varying field [J. Climate, 12, (1999) (1990-2009)] doi: 10.1175/1520-0442(1999)0121990:TENOSD2.0.CO;2
作者: Vecchi G.A.; Msadek R.; Anderson W.; Chang Y.-S.; Delworth T.; Dixon K.; Gudgel R.; Rosati A.; Stern B.; Villarini G.; Wittenberg A.; Yang X.; Zeng F.; Zhang R.; Zhang S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期:18
起始页码: 7579
结束页码: 7582
语种: 英语
英文摘要: In the original manuscript of Vecchi et al. (2013), Eq. (6), which is used to quantify the effective number of degrees of freedom in two autocorrelated time series Neff, was incorrectly transcribed from Bretherton et al. (1999). The correct equation is, where N is the number of samples in each time series, and rτ X and rτ Y are the biased estimates of the autocorrelation of each time series at lag τ. We evaluated whether the equation was incorrectly transcribed in the text of Vecchi et al. (2013), or whether the incorrect equation in the published paper was implemented in the calculations for the manuscript (which would have led to a substantial overestimate of the effective degrees of freedom). We found that the equation had been incorrectly transcribed. However, in reviewing the implementation of the equation an error was found. This error stemmed from an indexing mistake when referencing an array, in which the lag-1 autocorrelation term in the summation in the denominator (which is always less than 1) was summed once instead of twice, while the lag-0 autocorrelation term (which is exactly 1) was summed twice. Therefore, the degrees of freedom were underestimated in the original Vecchi et al. (2013) manuscript; this led to an overestimation in the size of the error bars in Figs. 2, 4, and 9. For Figs. 2 and 4, because the lag-1 autocorrelation of both the time series was close to 1, the underestimation in Neff was generally between 1 and 2, and resulted in only minor changes to the error bars, without impacting the validity of the statements about statistical significance. © 2017 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48734
Appears in Collections:气候减缓与适应
气候变化与战略

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作者单位: Department of Geosciences, Princeton University, Princeton, NJ, United States; Princeton Environmental Institute, Princeton University, Princeton, NJ, United States; Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique, Toulouse, France; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Department of Earth Science Education, Kongju National University, South Korea; University Corporation for Atmospheric Research, Boulder, CO, United States; IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA, United States; Physical Oceanography Laboratory of Ocean University of China, Qingdao, China; Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao, China; Function Laboratory for Ocean Dynamics and Climate, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China

Recommended Citation:
Vecchi G.A.,Msadek R.,Anderson W.,et al. Corrigendum: The effective number of spatial degrees of freedom of a time-varying field [J. Climate, 12, (1999) (1990-2009)] doi: 10.1175/1520-0442(1999)0121990:TENOSD2.0.CO;2[J]. Journal of Climate,2017-01-01,30(18)
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