The number and quality of ocean pH measurements have increased substantially over the past few decades such that trends, variability, and spatial patterns of change are now being evaluated. However, comparing pH changes across domains with different initial pH values can be misleading because a pH change reflects a relative change in the hydrogen ion concentration ([H⁺], expressed in mol kg⁻¹) rather than an absolute change in [H⁺]. We recommend that [H⁺] be used in addition to pH when describing such changes and provide three examples illustrating why.

中文翻译：

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技术说明：解释pH值变化

在过去的几十年中，海洋pH值测量的数量和质量已大大增加，因此现在正在评估趋势，变化和空间变化模式。但是，比较具有不同初始pH值的跨域的pH变化可能会产生误解，因为pH变化反映的是氢离子浓度的相对变化（[H ⁺ ]，以mol kg ^-1表示），而不是[H ⁺ ]。我们建议在描述此类变化时除pH值外还使用[H ⁺ ]，并提供三个示例说明原因。