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Ｕ_（３７）~Ｋ是指少数藻类生物所特有的一种分子化合物（长链不饱和酮）的不饱和指数。在现代海洋沉积物中，Ｕ_（３７）~Ｋ与浮游有孔虫的１８Ｏ值具有很好的相关性。在实验室培养的藻类生物体中、海洋悬浮颗粒物及海洋沉积柱样的表层样中均检测出长链不饱和酮，其Ｕ_（３７）~Ｋ与生物生长环境的海水表层温度具有很好的线性关系。因此，在古气候研究中，Ｕ_（３７）~Ｋ可作为一种有效的古温度指标，且在古气候研究中已得到应用。主要介绍了Ｕ_（３７）~Ｋ作为海水表层温度指标的原理、定量公式及其研究现状和存在的问题。
U_ (37) ~ K refers to the unsaturated index of a molecular compound (long-chain unsaturated ketone) that is unique to a few algae organisms. In modern marine sediments, U_ (37) ~ K has good correlation with 18O values of planktonic foraminifera. Long-chain unsaturated ketones were detected in both marine suspended particles and marine sediment-like samples in laboratory-cultured algae organisms. The U_ (37) ~ K and seawater surface temperature of the biological growth environment were very good Linear relationship. Therefore, in the paleoclimate research, U_ (37) ~ K can be used as an effective paleoclimatic index and has been applied in paleoclimate research. This paper mainly introduces the principle, quantitative formula, research status and existing problems of U_ (37) ~ K as the sea surface temperature index.