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Comparison of approaches to spatiotemporally interpolate land surface air temperature for the Qinghai–Tibet Plateau

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Abstract

The Qinghai–Tibet Plateau has complex geomorphic features, which makes it difficult to interpolate surface air temperature precisely because of sparse samples and intensive spatial variations. Different interpolation methods have been developed, and they perform differently under various situations. The statistical errors of interpolation methods are determined by the population properties, the condition of the samples, and the adequacy of covariates. However, few studies have focused on optimal interpolation strategies for Qinghai–Tibet Plateau. In this study, seven typical interpolation models were used and compared. The model-based methods (e.g., ordinary kriging), design-based methods (inverse distance weight (IDW), thin plate splines (TPS), and combined methods (e.g., spatiotemporal regression kriging) were considered. Using auxiliary information, spatiotemporal ordinary kriging, and spatiotemporal stratified kriging models were built. Methods were evaluated by cross validation with mean absolute error (MAE) and root-mean-square error (RMSE). Results showed that for both of the index (RMSE, MAE), spatiotemporal kriging stratified by seasons (1.016 °C RMSE, 0.767 °C MAE) < spatiotemporal kriging stratified by climate regions (1.018 °C, 0.767 °C) < spatiotemporal ordinary kriging (1.022 °C, 0.774 °C) < spatiotemporal regression kriging (1.058 °C, 0.806 °C) < TPS (1.551 °C, 1.143 °C) < ordinary kriging (2.674 °C, 2.044 °C) < IDW (2.917 °C, 2.296 °C). In conclusion, under the condition of sparsely distributed stations and complex geomorphic features in the study area, taking advantages of time dimensional information, spatiotemporal heterogeneity and covariates (i.e., elevation) can improve interpolation precision effectively.

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Data availability

Daily surface air temperature dataset was downloaded from the China Meteorological Data Service Center (http://data.cma.cn/). DEM data from DEMSRE3 was obtained from WorldGrids.org portal (http://worldgrids.org/doku.php/wiki:demsre3).

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Acknowledgements

We thank contributions from all the reviewers in improving this paper. This study was supported by the National Science Foundation of China (nos. 41971357, 42130713)

Funding

This work was supported by the National Science Foundation of China (nos. 41971357, 42130713).

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FS and CX wrote the main manuscript text. FS completed figures and tables with the instructions from CX and MH. CX provided the meteorological observation data. All authors reviewed the manuscript.

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Correspondence to Chengdong Xu.

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The authors have no relevant financial or non-financial interests to disclose.

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Shen, F., Xu, C. & Hu, M. Comparison of approaches to spatiotemporally interpolate land surface air temperature for the Qinghai–Tibet Plateau. Environ Earth Sci 82, 452 (2023). https://doi.org/10.1007/s12665-023-11151-3

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  • DOI: https://doi.org/10.1007/s12665-023-11151-3

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