Oxygen measurements at the very low concentrations (< 5 µmol O2 per kg) found in some parts of LOZs (low oxygen zones) are technically challenging and the historical data at very low oxygen concentrations have been often suspect (Bianchi et al., 2012). Consequently, estimation of the extent and evolution of OMZs (oxygen minimum zones) with particularly low oxygen concentrations at their core (e.g. AMZs [anoxic marine zones]) are still uncertain. …That’s from page 19 of the actual report, so already they are equivocating.
Thank you. Amazing.