Comparisons of climate change characteristics in typical arid regions of the Northern Hemisphere

In recent years, with the frequent occurrence of severe drought events, climate change in arid regions has become one research hotspots. However, previous studies mainly focused on a specific region, and correlations differences among various have not been clearly understood. this study, based latest monthly gridded dataset CRU, we compare characteristics its relationship large-scale oceanic oscillation indexes three typical Pan-Central-Asia (PCA), North America (NAm) Africa (NAf) multiple perspectives. The results show that precipitation PCA NAm increased obviously over past 80 while NAf decreased. After 1980s, warm-wet types. This type former continues to present, but latter’s changed warm-dry since 21st century. remains 1990s. Nonetheless, semi-arid patterns remain unchanged. an anti-phase variability pattern compared both interdecadal multi-decadal time scales. Pacific Decadal Oscillation (PDO) great influence NAm. temperature is significantly related variations Arctic (AO). inland contribution strong warming effect during cold season whole year much greater than warm season, coastal greater. mid-latitude dominated by cold-season regardless whether these are near sea or not. low-latitude little difference between seasons.