气候远程联系对尼日利亚萨赫勒地区(SRN)水文干旱的影响

IF 1.9 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Meteorology and Atmospheric Physics Pub Date : 2024-04-05 DOI:10.1007/s00703-024-01016-0
Akinwale T. Ogunrinde, Israel Emmanuel, David A. Olasehinde, Oluwaseun T. Faloye, Toju Babalola, Iyanda M. Animashaun
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引用次数: 0

摘要

了解干旱的时空模式及其与主要气候指数的联系对于制定早期预警和干旱缓解战略至关重要。本研究分析了尼日利亚萨赫勒地区的水文干旱变异性及其与全球气候指数的联系。在进行干旱分析之前,通过三次同质性测试验证了气温和降水数据的一致性。研究利用该地区的六个同步站,通过标准化降水蒸散指数(SPEI)确定干旱期。利用 SPEI 数据研究了干旱特征,如持续时间、严重程度和振幅。通过 Mann-Kendall 趋势分析和小波分析分别评估了干旱模式的趋势和变异性。利用皮尔逊相关分析探讨了大型气候指数与干旱之间的关系。趋势分析表明,干旱发生率在增加,其中四个站点的结果显著。小波分析表明,2-4 年和 4-8 年波段对了解 SPEI 干旱模式至关重要。相关性分析表明了各种气候趋势对同期气候事件的影响,将气候指数对干旱的影响排序为:MEI/SOI > NAO > AMO > DMI。相干性分析发现,厄尔尼诺/南方涛动与 SPEI 之间,以及 NAO 与 SPEI 之间,分别在 2-7 年和 8 年波段上存在明显的相关性。相位差表明,严重的干湿期与拉尼娜和厄尔尼诺事件相一致,强厄尔尼诺事件和 AMO 负相位主要造成该地区的严重干旱。
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Impact of climate teleconnections on hydrological drought in the Sahel Region of Nigeria (SRN)

Understanding the spatial and temporal patterns of drought and their connection with major climate indices is crucial for creating early warning and drought mitigation strategies. This study analyzed hydrological drought variability and its association with global climate indices in the Sahel Region of Nigeria. Before conducting drought analysis, temperature and precipitation data were verified for consistency using three homogeneity tests. The study utilized six synoptic stations across the area to identify drought periods through the Standardized Precipitation Evapotranspiration Index (SPEI). Drought characteristics such as duration, severity, and amplitude were examined using SPEI data. Trend and variability in drought patterns were assessed with Mann–Kendall trend analysis and wavelet analysis, respectively. The relationship between large climate indices and drought was explored using Pearson correlation analysis. Trend analysis indicated an increase in drought occurrences, with significant findings in four stations. Wavelet analysis identified the 2–4 and 4–8 year bands as crucial for understanding SPEI drought patterns. Correlation analysis showed the influence of various climate trends on concurrent climate events, ranking the impact of climate indices on drought as MEI/SOI > NAO > AMO > DMI. Coherence analysis found significant correlations between ENSO and SPEI, and NAO and SPEI, in the 2–7 and > 8-year bands, respectively. Phase differences suggested that severe wet and dry periods align with La Nina and El Nino events, with strong El Nino events and AMO negative phases mainly causing severe droughts in the area.

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来源期刊
Meteorology and Atmospheric Physics
Meteorology and Atmospheric Physics 地学-气象与大气科学
CiteScore
4.00
自引率
5.00%
发文量
87
审稿时长
6-12 weeks
期刊介绍: Meteorology and Atmospheric Physics accepts original research papers for publication following the recommendations of a review panel. The emphasis lies with the following topic areas: - atmospheric dynamics and general circulation; - synoptic meteorology; - weather systems in specific regions, such as the tropics, the polar caps, the oceans; - atmospheric energetics; - numerical modeling and forecasting; - physical and chemical processes in the atmosphere, including radiation, optical effects, electricity, and atmospheric turbulence and transport processes; - mathematical and statistical techniques applied to meteorological data sets Meteorology and Atmospheric Physics discusses physical and chemical processes - in both clear and cloudy atmospheres - including radiation, optical and electrical effects, precipitation and cloud microphysics.
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