南大西洋上空简单的副热带高压系统指数

IF 2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Kwesi A. Quagraine, Bruce Hewitson, Francis Nkrumah, Kwesi T. Quagraine, Temitope S. Egbebiyi
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引用次数: 0

摘要

这项研究为南大西洋高压(SAHP)系统引入了一种新的指数,以加深对区域气候多变性和变化的理解。副热带高压对区域气候有重大影响,但目前缺乏衡量其行为的综合指数。利用 1940 年至 2023 年的ERA5 再分析数据,拟议指数估算了 3 hPa 范围内最大海平面气压周围区域的加权中心点。这种方法确保了针对副热带高压事件的毗连区估算的稳健性和灵活性。结果表明,该指数有效地反映了 SAHP 的位置和强度。研究表明,SAHP 的纬度变化具有较强的单峰结构,而经度变化则呈现双峰结构。该指数的季节模式显示出明显的变化,与夏季(DJF)和秋季(MAM)相比,冬季(JJA)和春季(SON)的指数值相对较高,凸显了 SAHP 指数的年内变异性。在厄尔尼诺/南方涛动事件期间,SAHP 的平均中心点位置会发生显著变化,在厄尔尼诺期间会向西和向极地移动,而在拉尼娜期间则更加稳定。该指数计算要求最低,灵活性强,可应用于各种数据集,有助于评估未来副热带高压的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A simple subtropical high-pressure system index over the South Atlantic

A simple subtropical high-pressure system index over the South Atlantic

This research introduces a novel index for the South Atlantic High Pressure (SAHP) system to enhance understanding of regional climate variability and change. Subtropical highs significantly influence regional climates, yet comprehensive indices to measure their behaviours are lacking. Utilizing ERA5 reanalysis data from 1940 to 2023, the proposed index estimates a weighted centroid of the area surrounding the maximum sea level pressure within a 3 hPa range. This method ensures robustness and flexibility in contiguous area estimation specific to subtropical high events. Results showed the index effectively reflects the position and intensity of the SAHP. The study reveals that latitudinal variability of the SAHP has a strong unimodal structure, whereas longitudinal variability exhibits a bimodal structure. Seasonal patterns of the index show noticeable changes, with winter (JJA) and spring (SON) months having relatively high index values compared to summer (DJF) and autumn (MAM) months, underscoring the intra-annual variability of the SAHP index. During ENSO events, the mean centroid position of the SAHP shifts significantly, moving westwards and polewards during El Niño and showing greater stability during La Niña. The index, with minimal computation requirements and flexibility, can be applied across diverse datasets, aiding in the assessment of future subtropical high changes.

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来源期刊
Atmospheric Science Letters
Atmospheric Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.90
自引率
3.30%
发文量
73
审稿时长
>12 weeks
期刊介绍: Atmospheric Science Letters (ASL) is a wholly Open Access electronic journal. Its aim is to provide a fully peer reviewed publication route for new shorter contributions in the field of atmospheric and closely related sciences. Through its ability to publish shorter contributions more rapidly than conventional journals, ASL offers a framework that promotes new understanding and creates scientific debate - providing a platform for discussing scientific issues and techniques. We encourage the presentation of multi-disciplinary work and contributions that utilise ideas and techniques from parallel areas. We particularly welcome contributions that maximise the visualisation capabilities offered by a purely on-line journal. ASL welcomes papers in the fields of: Dynamical meteorology; Ocean-atmosphere systems; Climate change, variability and impacts; New or improved observations from instrumentation; Hydrometeorology; Numerical weather prediction; Data assimilation and ensemble forecasting; Physical processes of the atmosphere; Land surface-atmosphere systems.
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