Seasonality of temperature dependence of methane fluxes from natural wetlands
Data files
Jul 15, 2025 version files 3.88 GB
-
ECdata.xlsx
8.09 MB
-
README.md
2.61 KB
-
tas_day_NorESM2-MM_ssp585.zip
3.87 GB
Abstract
Temperature dependence is a crucial parameter in estimating methane (CH4) fluxes from natural wetlands, yet our understanding of this parameter remains inadequate. Seasonal fluctuations in water levels and ecosystem productivity lead to seasonal differences in CH4 production and oxidation. We hypothesized the existence of seasonality in the temperature dependence of CH4 fluxes. To validate this hypothesis, we analyzed the FLUXNET-CH4 dataset to determine the seasonal variation in temperature dependence of CH4 fluxes. We divided the year into six seasons based on air temperature and assessed the temperature dependence for each season using the apparent activation energy calculated by the Boltzmann-Arrhenius equation. Our results showed that temperature dependence showed a unimodal trend with seasons, with the apparent activation energy peaking in early summer (0.60 eV), and reaching its lowest point in late winter (-0.02 eV). This seasonal pattern of temperature dependence was consistent across wetlands with different vegetation types and hydrological conditions. Modeling of global wetland CH4 emissions based on seasonal temperature dependences showed a 19% (4-45%) increase in emission rates under the most severe temperature rise scenario. Our results emphasize the seasonality of temperature dependence, which will help to further improve current and future predictions of wetland CH4 emissions.
Data associated with:
Journal Name: Functional Ecology
Journal Code: FE
Print ISSN: 0269-8463
Online ISSN: 1365-2435
Title: Seasonality of temperature dependence of methane fluxes from natural wetlands
Authors: Li, Jinshuai; Hao, Tianxiang; Chen, Hongyang; Knox, Sara; Yang, Meng; Chen, Zhi; Yu, Guirui
Contact Author: Tianxiang Hao (E-mail: hao_tianxiang@163.com)
Description of files and variables
1. List of variables in sheet 1 of ECdata.xlsx:
- NUM: Data counting
- SITE_ID: Flux Site ID
- CLASS: Wetland category
- DOM_VEG: Vegetation category
- LATITUDE: Site latitude
- LONGITUDE: Site longitude
- YEAR: Measurement year
- MONTH: Measurement month
- DAY: Measurement day
- NUMBER: Data counting at stations within a year
- TA: Air temperature, unit: ℃
- TS: Soil temperature, unit: ℃
- GPP: Gross primary productivity, unit: g/m2/d
- RE: Rcosystem respiration, unit: g/m2/d
- WTD: Water table depth, unit: m
- NEE: Net ecosystem exchange, unit: g/m2/d
- CH4: Methane emission rate, unit: g/m2/d
2. Temperature data for future climate scenarios: tas_day_NorESM2-MM_ssp585.zip
DATA SOURCE
Global climate model: NorESM2‑MM (Norwegian Earth System Model version 2, medium‑resolution)
Project: CMIP6
Native grid label: gn (Gaussian native ~1° atmosphere grid, 192 × 288)
Experiment/Scenario: SSP5-8.5
Time coverage: 2015-01-01 to 2100-12-31 (daily)
Calendar: 365_day / noleap (February 29 absent)
VARIABLE DEFINITIONS
- tas: Near surface (2 meter) air temperature, unit: K
- lat: Latitude
- lon: Longitude
- time: Time coordinate, unit: day
FILE NAMING PATTERN
tas_day_NorESM2-MM_ssp585_r1i1p1f1_gn_YYYYMMDD-YYYYMMDD.nc
where YYYYMMDD‑YYYYMMDD denotes the inclusive start and end dates stored inside the file.
NOTES
Terminology: '*_bnds'
In CMIP style NetCDF files, any variable whose name ends with '_bnds' (e.g., 'time_bnds', 'lat_bnds', 'lon_bnds') stores the lower and upper bounds of the associated coordinate. For example, spatial ('lat', 'lon'): south-north or west-east edges of that cell, temporal ('time'): exact start and end of the time interval.
Auxiliary Files: 'wget-20231003003144'
Plain‑text log generated by the 'wget' download utility. It records the original URLs, timestamps, and checks used to retrieve the NetCDF data from the CMIP6 archive. The file contains no climate variables and can be deleted after verification, but retaining it helps reproduce or audit the download process.