DOI: 10.1002/2017JC013427
Scopus记录号: 2-s2.0-85040198355
论文题名: Uncertainties in Climatological Seawater Density Calculations
作者: Dai H. ; Zhang X.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 3 起始页码: 2192
结束页码: 2212
语种: 英语
英文关键词: climatology
; correlation coefficient
; seawater density calculation
; TEOS-10
; uncertainty analysis
Scopus关键词: climatology
; correlation
; density
; global climate
; global ocean
; salinity
; sea level pressure
; seawater
; sensor
; thermodynamics
; uncertainty analysis
; vertical profile
; water temperature
; Atlantic Ocean
; Baltic Sea
英文摘要: In most applications, with seawater conductivity, temperature, and pressure data measured in situ by various observation instruments e.g., Conductivity-Temperature-Depth instruments (CTD), the density which has strong ties to ocean dynamics and so on is computed according to equations of state for seawater. This paper, based on density computational formulae in the Thermodynamic Equation of Seawater 2010 (TEOS-10), follows the Guide of the expression of Uncertainty in Measurement (GUM) and assesses the main sources of uncertainties. By virtue of climatological decades-average temperature/Practical Salinity/pressure data sets in the global ocean provided by the National Oceanic and Atmospheric Administration (NOAA), correlation coefficients between uncertainty sources are determined and the combined standard uncertainties uc(ρ) in seawater density calculations are evaluated. For grid points in the world ocean with 0.25° resolution, the standard deviations of uc(ρ) in vertical profiles cover the magnitude order of 10−4 kg m−3. The uc(ρ) means in vertical profiles of the Baltic Sea are about 0.028kg m−3 due to the larger scatter of Absolute Salinity anomaly. The distribution of the uc(ρ) means in vertical profiles of the world ocean except for the Baltic Sea, which covers the range of (0.004, 0.01) kg m−3, is related to the correlation coefficient r(SA,p) between Absolute Salinity SA and pressure p. The results in the paper are based on sensors' measuring uncertainties of high accuracy CTD. Larger uncertainties in density calculations may arise if connected with lower sensors' specifications. This work may provide valuable uncertainty information required for reliability considerations of ocean circulation and global climate models. © 2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114325
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Ocean Exploration Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen, China
Recommended Citation:
Dai H.,Zhang X.. Uncertainties in Climatological Seawater Density Calculations[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(3)