西非季风(WAM)和大西洋冷舌(ACT)爆发的区域气候模式

K. B. Kouassi, A. Diawara, K. Kouadio, Fidèle Yoroba, E. Toualy
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引用次数: 0

摘要

本研究重点研究了1983-2000年苏达诺-萨赫勒地区大西洋冷舌(ACT)和西非季风(WAM)爆发的发生及其关系。使用两个模拟(WAFSSTERA和WAFSTREY)来研究区域大气模型(MAR)对两个不同的海面温度数据集(ERA-40和Reynolds SST数据集)的敏感性。MAR重现了几内亚地区的降雨量高值。在两次模拟中观察到弱降水带(<1mm/天)。WAFSSTERA的年平均日降雨量(约1.6毫米/天)高于WAFSTREY。WAM的模拟起始日期指数(ODI)显示季风流更多地向北渗透,特别是在几内亚湾的洪水年。这些结果还表明,季风的爆发并不取决于用于强制模型的SST数据集。最后,ODI和ACT发病日期之间的负差异可能是由于温暖的SST。南方热输运的年演变也与这种差异相一致。它显示出在7.5°N(西非平均降雨平衡位置)左右每年都会出现负异常和正异常。这项研究可能有助于预测WAM发作和ACT情景关系。关键词:大西洋冷舌,发病日期指数,区域气候模式,海面温度,西非季风。
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West African Monsoon (WAM) and Atlantic Cold Tongue (ACT) onsets using Regional Climate Model
This study focused on the occurrences and relationships of the Atlantic Cold Tongue (ACT) and the West African Monsoon (WAM) onsets in the Sudano-Sahelian region during 1983-2000. Two simulations (WAFSSTERA and WAFSSTREY) were used to investigate the sensitivity of the Regional Atmospheric Model (MAR) for two different datasets of sea surface temperature (ERA-40 and Reynolds SST datasets). The MAR reproduced the rainfall high values in the Guinean zone. A band of weak precipitation (<1 mm/day) was observed in the two simulations. WAFSSTERA gave more annual daily average rainfall (~1.6 mm/day) than WAFSSTREY. The simulated onset date index (ODI) of WAM showed more northward penetration of monsoon flow, particularly during flood years in the Gulf of Guinea. These results also indicated that the monsoon onset did not depend on the SST dataset used to force the model. Finally, the negative difference between ODIs and ACT onset date could be due to warm SST. The yearly evolution of the southern heat transport was also in agreement with this difference. It showed yearly succession of negative and positive anomalies around 7.5°N (mean rainy equilibrium position over West Africa). Such study could be useful for the forecast of WAM onset and ACT scenario relationships. Key words: Atlantic cold tongue, onset date index, regional climate model, sea surface temperature, West African Monsoon.
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Scientific Research and Essays
Scientific Research and Essays 综合性期刊-综合性期刊
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审稿时长
3.3 months
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