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# Coastal black-carbon budgets need a groundwater pathway
- URL: https://intelligence.wildlandseco.com/2026-11-01-beibu-groundwater-black-carbon-budget/
- Published: 2026-11-01T14:35:42.000Z
- Updated: 2026-11-01T14:35:42.000Z
- Description: Wet-season measurements in China's Beibu Gulf show rivers dominate dissolved black-carbon transport, while non-riverine routes add a measurable fraction.
- Author: Benjamin Worlund
- Tags: Water, Oceans, Climate, #ecological-intelligence, #brief-2026-11-01, #global-radar, #peer-reviewed, #geo-asia

Evidence

Peer-reviewed

Geography

Northern Beibu Gulf, China

System

River-ocean carbon pathways and submarine groundwater

## WHAT THE EVIDENCE SAYS

Seasonal coastal observations and salinity mixing analysis estimated approximately 8.0 tonnes/day dissolved black-carbon input from rivers and 1.7 tonnes/day from non-riverine sources in the wet season, attributed primarily to submarine groundwater discharge.

## WHY IT MATTERS / OUR READ

Coastal budgets that stop at mapped river mouths may miss material pathways beneath shorelines.

## CAVEATS / UNCERTAINTY

Concentrations and fluxes rely on reconstructed endmembers; non-riverine inputs are not experimentally isolated to groundwater alone.

## SOURCE

JGR Oceans — Zhang et al. (29 Oct 2026)  
[View original evidence ↗](https://doi.org/10.1029/2026JC024573?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-11-01

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-11-01/)