Fig. 3: Monthly time series and trend differences of 6-month SPEI during 1981–2022. | Nature

Fig. 3: Monthly time series and trend differences of 6-month SPEI during 1981–2022.

From: Warming accelerates global drought severity

Fig. 3: Monthly time series and trend differences of 6-month SPEI during 1981–2022.

a, The quasi-global average (50° S–50° N) 6-month SPEI based on AEDclm, Prclm and HRSPEI. MSWEP_AEDclm and CHIRPS_AEDclm refer to the average SPEI based on MSWEP and CHIRPS precipitation and AEDclm (climatological mean of GLEAM and hPET). GLEAM_Prclm and hPET_Prclm show the average SPEI based on AED from GLEAM and hPET and Prclm (climatological mean of MSWEP and CHIRPS). b, The trend difference between SPEI based on observations (observed precipitation and AED) and SPEI based on observed precipitation and climatology of AED (AEDclm). c, The trend difference between SPEI based on observations and SPEI based on observed AED and climatology of precipitation (Prclm). Non-significant trends (P > 0.05) are marked in grey to enhance clarity. The trend excludes dry land areas with average annual rainfall below 180 mm. For regions above 50° N, the trend is based on the mean of MSWEP_hPET and MSWEP_GLEAM, as CHIRPS is available up to 50° N.

Back to article page