Eritrean central-highland precipitation and associations with sea-surface temperature and atmospheric circulation,International Journal of Climatology

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Eritrean central-highland precipitation and associations with sea-surface temperature and atmospheric circulation
International Journal of Climatology ( IF 3.5 ) Pub Date : 2021-04-14 , DOI: 10.1002/joc.7138
Mussie Fessehaye _{1,

2} , Yuri Brugnara _{1,

2} , Jörg Franke _{1,

2} , Stefan Brönnimann _{1,

2}

Affiliation

This study explores the teleconnection between the boreal summer precipitation for the central highlands of Eritrea, with respect to global sea-surface temperature (SST) and atmospheric parameters (winds, pressure, humidity, and vertical velocity) as indirect indicators of atmospheric circulation. The central-highland summer (Jul–Aug) precipitation (1914–2015) is significantly negatively correlated with the Atlantic Niño (ATL3) index. Similarly, with a 2-month (May) or 1-month lead (Jun), SSTs over the equatorial Atlantic (Gulf of Guinea) are inversely correlated with the central-highland summer precipitation. Moreover, the regional atmospheric circulation reveals that the boreal summer precipitation series has a significant positive correlation with the westerly wind over the Gulf of Guinea at 700 hPa and a negative correlation with the Tropical Easterly Jet (TEJ) at 200 hPa. Overall, these findings depict the African Walker circulation cell, whereby a low-level westerly wind flows from the Gulf of Guinea across central Africa, coupled with a rising branch over north-eastern Africa, and reverses as an easterly wind at a higher level. These significant correlations between Atlantic Ocean SST as the precipitation-driving factor enabled the development and validation of an area-specific seasonal precipitation prediction model, as precipitation in this region is temporally and spatially highly variable.

中文翻译：

厄立特里亚中部高地降水及其与海面温度和大气环流的关联

本研究探讨了厄立特里亚中部高地北方夏季降水与作为大气环流间接指标的全球海面温度 (SST) 和大气参数（风、压力、湿度和垂直速度）之间的遥相关关系。中部高原夏季（7-8月）降水（1914-2015）与大西洋尼诺（ATL3）指数显着负相关。同样，在提前 2 个月（5 月）或 1 个月（6 月）的情况下，赤道大西洋（几内亚湾）的海温与中部高地夏季降水呈负相关。而且，区域大气环流显示，北半球夏季降水序列与700 hPa几内亚湾西风显着正相关，与200 hPa热带东风急流（TEJ）负相关。总体而言，这些发现描述了非洲沃克环流单元，其中低层西风从几内亚湾穿过中部非洲，加上非洲东北部的上升支流，并在更高水平逆转为东风。大西洋海温作为降水驱动因素之间的这些显着相关性使得特定区域的季节性降水预测模型的开发和验证成为可能，因为该地区的降水在时间和空间上是高度可变的。这些发现描述了非洲沃克环流单元，其中一股低空西风从几内亚湾穿过中非，加上非洲东北部上空的上升支流，并在更高水平逆转为东风。大西洋海温作为降水驱动因素之间的这些显着相关性使得特定区域的季节性降水预测模型的开发和验证成为可能，因为该地区的降水在时间和空间上是高度可变的。这些发现描述了非洲沃克环流单元，其中一股低空西风从几内亚湾穿过中非，加上非洲东北部上空的上升支流，并在更高水平逆转为东风。大西洋海温作为降水驱动因素之间的这些显着相关性使得特定区域的季节性降水预测模型的开发和验证成为可能，因为该地区的降水在时间和空间上是高度可变的。

更新日期：2021-04-14

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