Statistical forecast of GDDs and CHs for northern Mexico improved for bias correction
DOI:
https://doi.org/10.29312/remexca.v16i30.4048Keywords:
analogous years, bias correction, growing degree-days, chilling hoursAbstract
The existing information on monthly climate forecasts of agrometeorological variables, such as growing degree-days and chilling hours, is limited. This work presented the evaluation of a statistical forecast of growing degree-days and chilling hours for northern Mexico, with a focus on grape- and pecan-producing regions. The forecasting model is based on the analogous years method, using sea surface temperature anomalies through the monthly Niño-3.4 index, which is based on the ERSSTv5 database. In addition, it uses monthly historical databases of growing degrees-days and chilling hours, corresponding to the periods 1925-2012 and 1950-2020, respectively. To evaluate the model, monthly retrospective forecasts of growing degree-days and chilling hours were made for a period of 12 years (2012-2023) and contrasted with observations. It was found that the model underestimated up to -100 growing degree-days for regions in the south and center of the country; in contrast, for Sonora, Chihuahua, Durango, and Coahuila, the growing degree-days were underestimated with values ranging from -20 to -60 growing degree-days. In the case of chilling hours, it was found that the model underestimated up to 60 chilling hours, mainly in Chihuahua, Durango, Zacatecas, Baja California, and the center of the country. Based on these results, a bias correction method was applied, which was based on subtracting the mean bias, to reduce the error in the forecast. The corrected model showed a reduction in bias, mainly in cold months. Nevertheless, persistent bias was found in the model after applying bias correction.
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