movement in search of optimal temperature

Ocean acidification

While anthropogenic atmospheric CO2  dominates contributions to ocean acidification (OA) on a global scale, other human induced stresses may affect it on a local scale. \cite{Feely_2010}For example, acid rain from vehicle emissions and industry cause an increase in ocean acidity, which is likely relevant, at least near urbanised regions \cite{Doney_2007}. Any addition of organic carbon to the ocean, such as sewage, decomposes to dissolved inorganic carbon (DIC), and increases acidity \cite{Nagelkerken_2015}. Agricultural run-off provides nutrients which then fuel (an anthropogenic) increase in production of organic carbon in the ocean\cite{Howarth_2002}, again increasing acidity.'' DIC, pH, total alkalinity (TA), and partial pressure of CO2  (PCO2 )— must be known, in addition to temperature and salinity. To be more accurate, phosphate and silicic acid concentrations are also required  \cite{Haigh_2015}.''

Ocean deoxygenation 

Ocean deoxygenation refers to the loss of oxygen from the oceans due to climate change (Keeling et al. 2010)