Carbon monoxide (CO) is a trace gas that plays an essential role in global climate change despite not being a strong absorber of solar radiation. It is considered an indirect greenhouse gas as it reacts with hydroxyl radicals that would otherwise oxidize methane and halocarbons, reducing the oxidation capacity of the atmosphere and extending the half-lives of these potent greenhouse gases while also producing carbon dioxide (Evans & Puckrin, 1995;Thompson, 1992). Moreover, CO is the second most abundant carbon-containing component in the photo-degradation of chromophoric dissolved organic matter (CDOM)-the light absorbing fraction of dissolved organic carbon. It can be used as a proxy for other important photo-products that are more challenging to measure, such as carbon dioxide (CO 2 ) and biolabile carbon (Miller et al., 2002;Miller & Zepp, 1995;White et al., 2010). CO may be the key to advancing research on limiting CO 2 photoproduction on a global scale, which is an integral part of the global carbon cycle.The ocean is considered an important source of atmospheric CO, especially in offshore areas far from land. There are many reports on the daily cycles and supersaturation of CO in seawater, dating back as far as 50 years (Ohta, 1997;Swinnerton et al., 1970). Sources (photoproduction) and sinks (bacterial consumption and sea-air
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