Abrupt Change in Sahara Precipitation and the Associated Circulation Patterns

• 作者: Celestin Sindikubwabo Chenghai Wang Ruolin Li
• 来源期刊: 大气和气候科学(英文)
• 学科: 地球科学
• 关键词: DROUGHT Recovery NORTH AFRICA SAHARA DESERT TREND Climate
• 年，卷（期）: 2018,（2）
• 页码范围: 262-273
• 页数: 12页
• 分类号: P4

摘要

This study investigates the changes in inter-annual summer precipitation and the relationship with the atmospheric general circulation in the Sahara Desert occurred in the last 40 years (1971-2010). The results show that the summer precipitation undergone in drought recovery with a strong abrupt change at the end of 20th century. This change in Sahara precipitation is subsequently accompanied with the changes in the atmospheric circulation. The Sahara drought recovery is associated with a significant warming in the tropical and extratropical sea surface temperature, which led to the increase in moisture budget of the tropical African monsoon. The remarkable features such as the strengthening in Arctic high and mid-latitude upper level westerly wind, weakening in subpolar low and upper tropospheric zonal wind over North Africa have shown a distinct relationship with the Sahara precipitation changes.