Detecting Hot Spots of Methane Flux Using Footprint-Weighted Flux Maps

Camilo Rey-Sanchez*, Ariane Arias-Ortiz, Kuno Kasak, Housen Chu, Daphne Szutu, Joseph Verfaillie, Dennis Baldocchi

*Autor corresponent d’aquest treball

Producció científica: Contribució a una revistaArticleRecercaAvaluat per experts

12 Cites (Scopus)

Resum

In this study, we propose a new technique for mapping the spatial heterogeneity in gas exchange around flux towers using flux footprint modeling and focusing on detecting hot spots of methane (CH4) flux. In the first part of the study, we used a CH4 release experiment to evaluate three common flux footprint models: the Hsieh model (Hsieh et al., 2000), the Kljun model (Kljun et al., 2015), and the K & M model (Kormann and Meixner, 2001), finding that the K & M model was the most accurate under these conditions. In the second part of the study, we introduce the Footprint-Weighted Flux Map, a new technique to map spatial heterogeneity in fluxes. Using artificial CH4 release experiments, natural tracer approaches and flux chambers we mapped the spatial flux heterogeneity, and detected and validated a hot spot of CH4 flux in a oligohaline restored marsh. Through chamber measurements during the months of April and May, we found that fluxes at the hot spot were on average as high as 6589 ± 7889 nmol m−2 s−1 whereas background flux from the open water were on average 15.2 ± 7.5 nmol m−2 s−1. This study provides a novel tool to evaluate the spatial heterogeneity of fluxes around eddy-covariance towers and creates important insights for the interpretation of hot spots of CH4 flux, paving the way for future studies aiming to understand subsurface biogeochemical processes and the microbiological conditions that lead to the occurrence of hot spots and hot moments of CH4 flux.

Idioma originalEnglish
Número d’articlee2022JG006977
Nombre de pàgines22
RevistaJournal of Geophysical Research: Biogeosciences
Volum127
Número8
DOIs
Estat de la publicacióPublicada - d’ag. 2022

Fingerprint

Navegar pels temes de recerca de 'Detecting Hot Spots of Methane Flux Using Footprint-Weighted Flux Maps'. Junts formen un fingerprint únic.

Com citar-ho