气候变化领域集成服务门户(CCPortal): Quantifying rainfall seasonality across South Africa on the basis of the relationship between rainfall and temperature

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DOI	10.1007/s00382-020-05597-5
	Quantifying rainfall seasonality across South Africa on the basis of the relationship between rainfall and temperature
	Roffe S.J.; Fitchett J.M.; Curtis C.J.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-07-08
英文摘要	South Africa spans the subtropics at the interface between tropical, subtropical, and temperate weather systems, and consequently experiences distinct summer-, winter- and year-round rainfall zones (SRZ, WRZ and YRZ). Spatio-temporal characteristics of the various weather systems are broadly understood, however, the rainfall seasonality classification at the transition between these rainfall zones remains disputed. This surrounds the complexity of rainfall regimes, however, metrics with dissimilar rainfall seasonality definitions have been applied, hindering comparability. To address this dispute, meteorological data spanning 1987–2016 from 46 weather stations is used to assess the utility of a metric posited to quantify rainfall seasonality through a seasonality score derived from a ratio of monthly rainfall: temperature. This score statistically discriminates SRZ, WRZ and YRZ conditions, fulfilling an important requirement for a metric applied to South Africa. Nelspruit (NEL; score = 1.59) represents the strongest SRZ conditions across 30 eastern and central locations with scores > 0.30. Cape Town Wo (CTW; score = − 1.04) represents the strongest WRZ conditions across seven southwestern Cape and west coast locations with scores < − 0.30. Characterising the SRZ-to-WRZ transition region with scores from − 0.30 to 0.30, nine YRZ locations were classified. With the weakest score, Oudtshoorn (OUD; score = − 0.05), within the Cape Fold mountains, most represents YRZ conditions. Applicability across all weather stations, compatibility with known rainfall drivers, and agreement with known spatial rainfall seasonality characteristics demonstrates the ratio’s utility. Strong correspondence of scores between station and gridded data applications demonstrates additional confidence in the ratio, establishing its value for further application. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	Rainfall seasonality metrics; Seasonality score; South Africa; Summer rainfall zone; Winter rainfall zone; Year-round rainfall zone
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183331
作者单位	School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South Africa; Department of Geography, Environmental Management and Energy Studies, University of Johannesburg, Johannesburg, South Africa
推荐引用方式 GB/T 7714	Roffe S.J.,Fitchett J.M.,Curtis C.J.. Quantifying rainfall seasonality across South Africa on the basis of the relationship between rainfall and temperature[J],2021,56(2021-07-08).
APA	Roffe S.J.,Fitchett J.M.,&Curtis C.J..(2021).Quantifying rainfall seasonality across South Africa on the basis of the relationship between rainfall and temperature.Climate Dynamics,56(2021-07-08).
MLA	Roffe S.J.,et al."Quantifying rainfall seasonality across South Africa on the basis of the relationship between rainfall and temperature".Climate Dynamics 56.2021-07-08(2021).