Diol and keto-ol concentrations decreased with increasing oxygen exposure time.

1,15‐DOXI and upwelling indices were not affected by oxic degradation.

Oxic degradation may cause changes in LDI and derived SSTs.

The class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0146638016300912&_mathId=si1.gif&_user=111111111&_pii=S0146638016300912&_rdoc=1&_issn=01466380&md5=d81ac3b81c775f06decf58cabfa867f6">class="imgLazyJSB inlineImage" height="23" width="24" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0146638016300912-si1.gif">class="mathContainer hidden">class="mathCode">${\text{U}}_{37}^{{\text{K}}^{\prime }}$ index did not show changes with increasing oxygen concentration.

Keto-ols are slightly better preserved than the corresponding diols.