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Seasonal Temperature Distributions and Variations in Salt Marshes: Field Investigation and Numerical Simulation

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Bibliographic Details
Title: Seasonal Temperature Distributions and Variations in Salt Marshes: Field Investigation and Numerical Simulation
Authors: Xiayang Yu, Xinghua Xu, Lucheng Zhan, Haifeng Cheng, Pei Xin
Source: Water Resources Research, Vol 60, Iss 8, Pp n/a-n/a (2024)
Publisher Information: American Geophysical Union (AGU), 2024.
Publication Year: 2024
Subject Terms: Environmental sciences, climate change, 13. Climate action, surface water‐groundwater interaction, tide, heat conduction, GE1-350, 15. Life on land, coastal wetland, 01 natural sciences, 6. Clean water, 0105 earth and related environmental sciences
Description: Soil temperature regulates biogeochemical processes and is a key environmental factor affecting salt marsh ecosystems. Previous studies on soil temperature and heat transport in intertidal marshes predominantly focused on short‐term changes, leaving seasonal variations unclear. This study conducted a yearlong field and modeling investigation to examine temporal and spatial temperature variations in a creek‐marsh section under estuarine and meteorological influences. The results showed that inundating tidal water propagated the seasonal water temperature signal to marsh soils, especially at low elevations, thereby modulating air temperature‐induced soil temperature variations and distributions. The response of soil temperature to air and tidal water temperatures exhibited a damped and delayed pattern. In contrast, tide‐induced porewater circulations near the creek facilitated the temperature responses. A regression model incorporating a Gamma distribution function was developed to quantify the delayed and cumulative thermal effects of tidal water and air on shallow soil temperatures. The model coefficients varied along the creek‐marsh section, capturing the seasonal regulation of periodic tidal inundation on soil temperature in the low‐elevation marsh and near the creek. Sensitivity analyses indicated that relative sea level rise lowered yearly‐averaged temperatures for the marsh platform by enhancing latent heat export. Surface water warming increased the marsh temperatures at lower elevations. This study demonstrates that the creek‐marsh topography, warming, and relative sea level rise jointly affect soil temperature dynamics, advancing our understanding of temperature‐dependent biogeochemical processes in marsh ecosystems.
Document Type: Article
Language: English
ISSN: 1944-7973
0043-1397
DOI: 10.1029/2023wr037016
Access URL: https://doaj.org/article/544c66c158a043e593745c41772ca637
Rights: CC BY
Accession Number: edsair.doi.dedup.....2dfadc82d2d5d2299ba87f6166981769
Database: OpenAIRE
Description
Abstract:Soil temperature regulates biogeochemical processes and is a key environmental factor affecting salt marsh ecosystems. Previous studies on soil temperature and heat transport in intertidal marshes predominantly focused on short‐term changes, leaving seasonal variations unclear. This study conducted a yearlong field and modeling investigation to examine temporal and spatial temperature variations in a creek‐marsh section under estuarine and meteorological influences. The results showed that inundating tidal water propagated the seasonal water temperature signal to marsh soils, especially at low elevations, thereby modulating air temperature‐induced soil temperature variations and distributions. The response of soil temperature to air and tidal water temperatures exhibited a damped and delayed pattern. In contrast, tide‐induced porewater circulations near the creek facilitated the temperature responses. A regression model incorporating a Gamma distribution function was developed to quantify the delayed and cumulative thermal effects of tidal water and air on shallow soil temperatures. The model coefficients varied along the creek‐marsh section, capturing the seasonal regulation of periodic tidal inundation on soil temperature in the low‐elevation marsh and near the creek. Sensitivity analyses indicated that relative sea level rise lowered yearly‐averaged temperatures for the marsh platform by enhancing latent heat export. Surface water warming increased the marsh temperatures at lower elevations. This study demonstrates that the creek‐marsh topography, warming, and relative sea level rise jointly affect soil temperature dynamics, advancing our understanding of temperature‐dependent biogeochemical processes in marsh ecosystems.
ISSN:19447973
00431397
DOI:10.1029/2023wr037016