Abstract
Key message
We identified the climate zones where the climate has highest variation similarity to aid to climate data selection.
Abstract
The calculation of climate-growth correlations is the analytical foundation to study climate change influence on tree growth in dendrochronology. However, the majority of climate data used in climate-growth correlation analyses are not directly recorded on the sample sites, but obtained from nearby weather stations. We used a sample site in Saihanba region as a case study to address how correlation bias may occur if nearby climate products have no high correlation with the climate in the sample site. Temperatures in the sample site and from other data resources were highly correlated, suggesting that small potential bias in growth-temperature correlations when using temperatures from nearby climate stations. However, precipitation had large spatial variability, resulting in low correlation between precipitation of the sample site and precipitation from other resources. Large biases in growth-precipitation analysis would be expected when using precipitation from nearby stations, suggesting that precipitation records should be carefully chosen. To aid in this selection, we used a cluster analysis and multiple data-products across China to identify regions where station climate do and do not reflect accurately site conditions, and classified temperature and precipitation zones where climate has high correlation among grid cells of the same climate zone based on similarity of the macroclimate using a ~ 2.5 km resolution gridded climate dataset. Using climate stations located in the same cluster as the sample sites would help to prevent or reduce correlation biases in growth-climate analyses. The generated temperature and precipitation zones are freely available to download as GeoTIFF files in the online supplementary materials (Fig. 1S and Fig. 2S).
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Funding
This work was funded by the National Key Research and Development Program of China (2017YFD0600403), the Education Department of Hebei Province (BJ2020025), the National Natural Science Foundation of China (41601045), and Talent introduction program in Hebei Agricultural University (YJ201918).
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XZ processed the data, analyzed the results, and wrote the majority of the manuscript. XZ and XH designed the experiment and methodology. RM participated the manuscript writing, reviewed, and edited the earlier version. CX, and MH participated in data processing and data collection.
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The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.
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Communicated by Achim Braeuning .
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Zhang, X., Manzanedo, R.D., Xu, C. et al. How to select climate data for calculating growth-climate correlation. Trees 35, 1199–1206 (2021). https://doi.org/10.1007/s00468-021-02108-9
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DOI: https://doi.org/10.1007/s00468-021-02108-9