Recycling of iron in SouthernOcean declining as population of chinstrap penguins shrinks NatureComms
) was considered. Although similar plumes can be observed emanating from nearby locations, those plumes come from the sediments and snow melting, as there are no penguin colonies located in those spots. Plumes being released from Vapour Col, carry as well the guano runoff, which contains the Fe that was later used to calculate the export efficiency.
Finally, to obtain Fe release efficiencies from the breeding site, the percentage that the Fe in the considered water volume represents from the total accumulated Fe in the guano from ground was calculated. For the whole extension of Vapour Col, 380.2 m. These guano volumes were used to obtain Fe content and subsequently its percentage being released in the water .
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