Data of Accumulation potential of dissolved organic matter under physical-ecological controls in the rapidly changing Central Indian Ocean

Published: 11 January 2023| Version 1 | DOI: 10.17632/mrddf37zxz.1
Contributors:
Yixue Zhang,
Ying Wu

Description

There is a lack of knowledge about the variability of marine dissolved organic matter (DOM) pools under ongoing ocean warming, which is the key to understanding oceanic carbon storage. The tropical Indian Ocean (IO) is ideal for predicting the climatic feedback in marine DOM pools for being one of the fastest-warming oceans. However, DOM transformation and export remain underexplored and enigmatic in the IO. Here, we integrated in situ DOM observations and incubation experiments in the Central IO (CIO) and Bay of Bengal (BoB). A large DOM pool was found in the CIO, where we emphasized the prominent contribution of subsurface production, with physical forcing seasonally playing a supporting role. The incubation results revealed the active heterotrophy in the BoB, whereas dark carbon fixation by ammonia-oxidizing microorganisms was considered an alternative strategy in the subsurface CIO. In mesopelagic waters, the CIO exhibited great metabolic potential for changing the reactivity of the DOM pool. In the context of ocean warming, we speculated that the DOM pool in the BoB might have a positive feedback, while the CIO might have a more complex response due to subsurface temperature anomalies. Our findings reduced uncertainties in future estimates of oceanic carbon sequestration and preliminarily highlighted the role of CIO as a substantial modulator for climatic feedback.

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Institutions

East China Normal University

Categories

Earth Sciences

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