Characteristics of Spatial and Temporal Variation of Autumn Rain in Guizhou Province under the Background of Climate Change

PurposeIn order to understand the change characteristics of autumn rain in Guizhou Province, scientific reference was provided for agriculture meteorological service and climate change response in this region.

MethodThe variation trend and spatial pattern of autumn rain in Guizhou Province in the past 58 years were analyzed by linear regression, wavelet analysis and IDW interpolation based on the daily precipitation data of 84 meteorological observation stations in Guizhou Province from 1960 to 2017.

ResultThere were decline trends for occurrence frequency, occurrence station proportion of autumn rain and autumn rain index in the past 58 years. However, an increasing trend could be found since the 2010s . There were prominent spatial heterogeneities for variation trend, occurrence frequency and index of autumn rain. The occurrence scope of mild autumn rain was big while occurrence scope of moderate and severe autumn rains were relatively small. There were two time scale variation cycles for autumn rain, and 19a was the main period of change.

ConclusionThe decline of occurrence frequency, occurrence station proportion of autumn rain and autumn rain index is beneficial to agricultural production. However, the western region in Guizhou with higher frequency of occurrence of autumn rain needs to establish countermeasures and reduce the loss of agricultural production.