2025.06.25

Quasi-Real-Time Estimation of CO₂/CH₄ Emission Ratios Based on Atmospheric Observations at Hateruma Island

Overview

We present a near-real-time estimation of the CO₂/CH₄ emission ratio based on atmospheric observations on Hateruma Island.

Atmospheric Observations

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Changes in atmospheric CO₂ and CH₄ concentrations observed at Hateruma and Yonaguni

Changes in atmospheric CO₂ and CH₄ concentrations observed at Hateruma and Yonaguni

Data Access

Estimation Method

The ratio of atmospheric concentration variations (ΔCO₂/ΔCH₄) observed during the three months from January to March reflects the CO₂/CH₄ emission ratio in China.

Chart or figure related to Estimation Method
Chart or figure related to Estimation Method
Chart or figure related to Estimation Method

Data Access

Estimation of Long-term Changes in CO₂/CH₄ Emission Ratios in East Asian Continent

Chart or figure related to Estimation of Long-term Changes in CO₂/CH₄ Emission Ratios in East Asian Continent

Estimated Changes in FFCO₂/CH₄ Emission Ratios in East Asian Continent Since 2020

Rate of change is calculated relative to the average value for the preceding nine years (2011-2019).

Chart or figure related to Estimated Changes in FFCO₂/CH₄ Emission Ratios in East Asian Continent Since 2020

Data Access