从实地数据估算海冰上阻力系数的不确定性

IF 2.3 3区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Sébastien Blein, Virginie Guemas, Ian M. Brooks, Andrew D. Elvidge, Ian A. Renfrew
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引用次数: 0

摘要

地表湍流交换对海冰动力学、海洋和海冰热量预算以及极地大气都起着关键作用。表层湍流通量参数化的不确定性主要由传输系数决定,参数化的发展需要从实地数据中估计这些传输系数。测量误差会通过传输系数的计算传播,并与用于校正稳定性效应的经验稳定性函数的不确定性一起造成总误差。在此,我们提出了一种方法,用于评估它们对每个系数估计值以及总阻力系数不确定性的单独贡献,并将此方法应用于 SHEBA 试验。我们得出结论,对于最常见的阻力系数值(介于(1.0乘以10^{-3}\)和(2.5乘以10^{-3}\)之间),相对总不确定性介于25和50(\%\)之间。对于稳定参数为\(|\zeta|>1\)的稳定或不稳定条件,中性阻力系数的总不确定性平均超过中性阻力系数本身的值,而对于\(|\zeta|<1\),总不确定性约为阻力系数的25\(\%\)。对于更接近中性的条件,这种不确定性主要是由表面湍动动量通量的测量不确定性造成的,因此应努力减少不确定性。我们还提出了一种客观的实地数据筛选程序,包括保留中性阻力系数相对误差不超过给定阈值的数据。与其他数据筛选方法相比,除了常用的通量质量控制程序外,这种方法还能减少阻力系数的离散性,我们认为这表明数据集的质量更高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Uncertainties of Drag Coefficient Estimates Above Sea Ice from Field Data

Uncertainties of Drag Coefficient Estimates Above Sea Ice from Field Data

Surface turbulent exchanges play a key role on sea ice dynamics, on ocean and sea ice heat budgets and on the polar atmosphere. Uncertainties in parameterizations of surface turbulent fluxes are mostly held by the transfer coefficients and estimates of those transfer coefficients from field data are required for parameterization development. Measurement errors propagate through the computation of transfer coefficients and contribute to its total error together with the uncertainties in the empirical stability functions used to correct for stability effects. Here we propose a methodology to assess their contributions individually to each coefficient estimate as well as the total drag coefficient uncertainty and we apply this methodology on the example of the SHEBA campaign. We conclude that for most common drag coefficient values (between \(1.0\times 10^{-3}\) and \(2.5\times 10^{-3}\)), the relative total uncertainty ranges from 25 and 50\(\%\). For stable or unstable conditions with a stability parameter \(|\zeta |>1\) on average, the total uncertainty in the neutral drag coefficient exceeds the neutral drag coefficient value itself, while for \(|\zeta |<1\) the total uncertainty is around 25\(\%\) of the drag coefficient. For closer-to-neutral conditions, this uncertainty is dominated by measurement uncertainties in surface turbulent momentum fluxes which should therefore be the target of efforts in uncertainty reduction. We also propose an objective data-screening procedure for field data, which consists of retaining data for which the relative error on neutral drag coefficient does not exceed a given threshold. This method, in addition to the commonly used flux quality control procedure, allows for a reduction of the drag coefficient dispersion compared to other data-screening methods, which we take as an indication of better dataset quality.

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来源期刊
Boundary-Layer Meteorology
Boundary-Layer Meteorology 地学-气象与大气科学
CiteScore
7.50
自引率
14.00%
发文量
72
审稿时长
12 months
期刊介绍: Boundary-Layer Meteorology offers several publishing options: Research Letters, Research Articles, and Notes and Comments. The Research Letters section is designed to allow quick dissemination of new scientific findings, with an initial review period of no longer than one month. The Research Articles section offers traditional scientific papers that present results and interpretations based on substantial research studies or critical reviews of ongoing research. The Notes and Comments section comprises occasional notes and comments on specific topics with no requirement for rapid publication. Research Letters are limited in size to five journal pages, including no more than three figures, and cannot contain supplementary online material; Research Articles are generally fifteen to twenty pages in length with no more than fifteen figures; Notes and Comments are limited to ten journal pages and five figures. Authors submitting Research Letters should include within their cover letter an explanation of the need for rapid publication. More information regarding all publication formats can be found in the recent Editorial ‘Introducing Research Letters to Boundary-Layer Meteorology’.
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