The Tibetan Plateau (TP) plays an important role in regulating the global hydrologic cycle. Using a fully coupled climate model, we conduct sensitivity experiments to quantify the impact of the TP on North Africa precipitation. Removing the TP in the model can enhance North African precipitation. Specifically, North Africa precipitation increases substantially during the rainy season (from May to October) though it remains unchanged during the dry season (from November to April). During the rainy season, the TP’s absence in the model causes an anomalous moisture transport from the Indian Ocean and tropical Atlantic to North Africa, which enhances the moisture convergence over North Africa and increases precipitation there. Later on, the change in the Atlantic, that is, cooling (warming) in the North (South) Atlantic forces a southward cross-equatorial moisture transport anomaly from North Africa to the equatorial Atlantic, decreasing the moisture convergence over North Africa and thus precipitation. In general, the moisture convergence is strengthened in most regions of North Africa due to the TP removal, so the resultant precipitation is increased. During the dry season, atmospheric convection center over the Africa continent is located mainly south of the equator, and there is almost no anomalous moisture transport toward North Africa in response to the TP removal. These results suggest that the uplift of the TP may have led to North African aridity.

青藏高原（TP）在调节全球水文循环方面发挥着重要作用。使用完全耦合的气候模型，我们进行了敏感性实验，以量化 TP 对北非降水的影响。去除模型中的 TP 可以增强北非降水。具体而言，北非降水在雨季（从 5 月到 10 月）大幅增加，但在旱季（从 11 月到 4 月）保持不变。在雨季，模式中TP的缺失导致印度洋和热带大西洋到北非的异常水分输送，这增强了北非的水分辐合并增加了那里的降水。后来大西洋的变化，也就是，北（南）大西洋的冷却（变暖）迫使从北非到赤道大西洋向南越过赤道的水分输送异常，减少了北非的水分辐合，从而减少了降水。总的来说，北非大部分地区由于TP的去除，水汽辐合增强，导致降水量增加。在旱季，非洲大陆上空的大气对流中心主要位于赤道以南，几乎没有响应TP去除的异常水分向北非输送。这些结果表明青藏高原的抬升可能导致了北非干旱。总的来说，北非大部分地区由于TP的去除，水汽辐合增强，导致降水量增加。在旱季，非洲大陆上空的大气对流中心主要位于赤道以南，几乎没有响应TP去除的异常水分向北非输送。这些结果表明青藏高原的抬升可能导致了北非干旱。总的来说，北非大部分地区由于TP的去除，水汽辐合增强，导致降水量增加。在旱季，非洲大陆上空的大气对流中心主要位于赤道以南，几乎没有响应TP去除的异常水分向北非输送。这些结果表明青藏高原的抬升可能导致了北非干旱。