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Abstract. In contrast to the large number of studies on humic waters from permafrost-freeregions and oligotrophic waters from permafrost-bearing regions, the bio-and photolability of DOM from the humic surface waters of permafrost-bearingregions has not been thoroughly evaluated. Following standardized protocol,we measured biodegradation (at low, intermediate and high temperatures) andphotodegradation (at one intermediate temperature) of DOM in surface watersalong the hydrological continuum (depression → stream →thermokarst lake → Pechora River) within a frozenpeatland in European Russia. In all systems, within the experimental resolution of 5 % to 10 %,there was no bio- or photodegradation of DOM over a 1-month incubation period. Itis possible that the main cause of the lack of degradation is the dominanceof allochthonous refractory (soil, peat) DOM in all waters studied. However, allsurface waters were supersaturated with CO2. Thus, this study suggeststhat, rather than bio- and photodegradation of DOM in the water column,other factors such as peat pore-water DOM processing and respiration ofsediments are the main drivers of elevated pCO2 and CO2 emission in humicboreal waters of frozen peat bogs.

Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation