Abstract
Hydrofluorocarbons (HFCs) are strong greenhouse gases and regulated by the Montreal Protocol as substitutes of ozone depletion substances. Currently, Chinese HFC emissions keep increasing, and the inventory is only on a national or city level. A high-resolution gridded HFC emission inventory is needed to develop HFC reduction policy and phase-down schedule. We developed a method by integrating point sources with longitude and latitude information and area sources using the proxy factor to explore the distribution of R-410A [a mixture of HFC-32 (CH2F2) and HFC-125 (C2HF5)] emissions from the room air-conditioning sector on a 10 × 10 km2 grid scale. Variety of regression models (including the principal component analysis, multiple linear regressions, stepwise regressions, and linear regression), analysis scale (national level and provincial level), and data dimensions (the proxy factor and unit-area value) were tested. The gross domestic product was found as the optimal proxy factor and used to spatialize R-410A emissions at a high-resolution scale. Compared to the national-level analysis, model evaluation parameters were largely improved for the provincial-level regression analysis, including root-mean-square error (from 20.96 to 11.35), normalized mean bias (from 0.16 to − 0.01), normalized mean error (from 0.45 to 0.20), mean absolute error (from 11.27 to 4.97), correlation coefficient (from 0.91 to 0.97), and relative error (from 39% to 76%), suggesting a better performance for the provincial-level analysis. This study provides a cost-effective method to establish fine-resolution HFC inventory. Meanwhile, high-resolution emissions grid data could be further applied to implement site-specific management of low-carbon development.
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Data availability
The data and material that supporting the findings of this study are available from the corresponding author (Bo Yao) on request.
Abbreviations
- AAT:
-
Average annual temperature
- HDD18 & CDD26:
-
Heating degree days and cooling degree days
- CO2-eq:
-
Carbon dioxide-equivalent
- DMSP-OLS:
-
Defense Meteorological Satellite Program Operational Linescan System
- F-gas:
-
Fluorinated greenhouse gas
- GDP:
-
Gross domestic product
- GHG:
-
Greenhouse gas
- GWP:
-
Global warming potential
- HFC:
-
Hydrofluorocarbon
- R-410A:
-
Known as HFC-410A, a blend of HFC-32 (CH2F2) and HFC-125 (C2HF5)
- NTL:
-
Nighttime light
- ODS:
-
Ozone-depleting substance
- RAC:
-
Room air-conditioning
- RP:
-
Resident population
- \(E_{Inventory,i}\) :
-
R-410A emissions of the prefecture-level city i from emission inventory (kg)
- \(E_{model,i}\) :
-
R-410A emissions of the prefecture-level city i from the model prediction (kg)
- \(GDP_{grid,j}\) :
-
GDP value in each of the 10 × 10 km2 grid of the province or a province-level municipality j (1010 RMB)
- \(GDP_{province,j}\) :
-
Summed GDP value of the province or a province-level municipality j (1010 RMB)
- \(HFC - 410A_{grid,j}\) :
-
R-410A emissions in each of the 10 × 10 km2 grid of the province or a province-level municipality j (kg)
- \(HFC - 410A_{province,j}\) :
-
Total R-410A emissions of the province or a province-level municipality j (kg)
- \(N\) :
-
Number of prefecture-level cities, \(N\) = 330
- \(NMB\) :
-
Normalized mean bias
- \(NME\) :
-
Normalized mean error
- \(MAE\) :
-
Mean absolute error
- \(R\) :
-
Correlation coefficient
- \(RE\) :
-
Relative error
- \(RMSE\) :
-
Root-mean-square error
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Acknowledgements
This work was supported by the National Key R&D Program of China (Grant No. 2019YFC0214502) and the National Natural Science Foundation of China (Grant No. 72074154 and No. 72174125).
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PW and LZ performed research, analyzed data, and wrote the paper; BY, YZ, and BC designed research, performed research and provided the part on policy implication; HL and ZX organized the literature review; HY, YD, PW, LL and YR provided and verified the data; LP, LC, XB, and YL organized and formatted the paper.
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Wu, P., Zhang, L., Yao, B. et al. Spatialization of Chinese R-410A emissions from the room air-conditioning sector. Environ Dev Sustain 25, 5263–5281 (2023). https://doi.org/10.1007/s10668-022-02264-z
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DOI: https://doi.org/10.1007/s10668-022-02264-z