Hydrology, rather than wildfire burn extent, determines post‐fire organic and black carbon export from mountain rivers in central coastal California

Author:

Barton Riley1ORCID,Richardson Christina M.2ORCID,Pae Evelyn1,Montalvo Maya S.23,Redmond Michael24,Zimmer Margaret A.2,Wagner Sasha1

Affiliation:

1. Department of Earth and Environmental Sciences Rensselaer Polytechnic Institute Troy New York USA

2. Department of Earth and Planetary Sciences University of California Santa Cruz California USA

3. Department of Geography Simon Fraser University Burnaby British Columbia Canada

4. Department of Climate and Space Sciences and Engineering University of Michigan at Ann Arbor Ann Arbor Michigan USA

Abstract

AbstractCoastal mountain rivers export disproportionately high quantities of terrestrial organic carbon (OC) directly to the ocean, feeding microbial communities and altering coastal ecology. To better predict and mitigate the effects of wildfires on aquatic ecosystems and resources, we must evaluate the relationships between fire, hydrology, and carbon export, particularly in the fire‐prone western United States. This study examined the spatiotemporal export of particulate and dissolved OC (POC and DOC, respectively) and particulate and dissolved black carbon (PBC and DBC, respectively) from five coastal mountain watersheds following the 2020 CZU Lightning Complex Fires (California, USA). Despite high variability in watershed burn extent (20–98%), annual POC, DOC, PBC, and DBC concentrations remained relatively stable among the different watersheds. Instead, they correlated significantly with watershed discharge. Our findings indicate that hydrology, rather than burn extent, is a primary driver of post‐fire carbon export in coastal mountain watersheds.

Funder

Consortium of Universities for the Advancement of Hydrologic Science

National Science Foundation

Rensselaer Polytechnic Institute

Publisher

Wiley

Subject

Aquatic Science,Oceanography

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