The Dissipation of Fluctuating Tracer Variances
The Dissipation of Fluctuating Tracer Variances
复制标题
波动示踪方差的耗散
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Roland
中科院分区：
文献类型：
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作者：
De Szoeke;A. Roland
Abstract The evolution of the covariance of two tracers involves a quantity called codissipation, proportional to the covariance of the gradients of the two tracers, and analogous to the dissipation of tracer variance. The evolution of the variance of a composite tracer—a linear combination of two simple, primary tracers—depends on the“composite dissipation,” a combination of the individual simple tracer dissipations and the codissipation. The composite dissipation can be negative (implying growth of the variance of the composite tracer) for structures in which the correlation of the simple tracer gradients are large enough (i.e., large codissipation). This situation occurs in the phenomena of double diffusion and salt fingering. A particular composite tracer called watermass variation, a measure of water-type scatter about the mean tracer versus tracer relationship, lacks production terms of the conventional form—tracer flux multiplying tracer gradient—in its variance evolution balance. Only codissipatio...
