Mangrove Creeks Are a Sink for Isoprene—A Functional Link Between Ecosystems

Hrebien, Victoria; Deschaseaux, Elisabeth; Rosentreter, Judith A.; Eyre, Bradley D.

doi:10.1029/2021jg006418

Cited by 1 publication

(1 citation statement)

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“…Firstly, the tidal export rates are based on the net flux of hourly samples interpolated over 10-minute intervals. The net export is the small difference between a large ebb export and a large flood import, each with their own error, which is propagated into the small net difference (Fischer et al, 1979;Hrebien et al, 2021). There are uncertainties associated with matching the water depths and volumes of the incoming and outgoing tides and over two tidal cycles.…”

Section: Sources Of Mangrove Dic and Talkmentioning

confidence: 99%

Uncertainties about the role of terrestrial dissolved inorganic carbon and alkalinity loads in buffering the Great Barrier Reef lagoon against ocean acidification

Rosentreter,

Eyre

2024

Preprint

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Terrestrial dissolved inorganic carbon (DIC) and total alkalinity (TAlk) loads have contrasting effects on the pH and carbonate chemistry of the coastal ocean. While TAlk can buffer against ocean acidification, elevated exports of free CO2 can further exacerbate ocean acidification. In this study, we estimate terrestrial DIC and TAlk loads from rivers and mangrove floodplains from six bioregions and over different flow years to assess their influence on the buffering capacity of the Great Barrier Reef (GBR) lagoon in Australia.Overall, we find a large range of terrestrial (river + mangrove) DIC (-0.91 to 2.60 Tg C yr -1 ) and TAlk (-0.04 to 2.62 Tg C yr -1 ) loads that were higher in high flow years and in the tropical wet bioregions. Importantly, we show that a net buffering effect on the GBR is possible based on terrestrial loads that include short-term mangrove TAlk export rates that are higher in TAlk compared to DIC. However, when we consider long-term mangrove TAlk production via pyrite formation, which is low in TAlk, we find that terrestrial loads can acidify the GBR lagoon. Because of the large range associated with current measurements, it remains unclear if terrestrial inorganic carbon loads buffer or acidify the GBR lagoon. Ongoing monitoring will be essential to improve predictions of the conditions and drivers of the carbonate chemistry of the GBR coastal waters with immediate consequences on the health of the reef ecosystem.

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Section: Sources Of Mangrove Dic and Talkmentioning

confidence: 99%