气候变化领域集成服务门户(CCPortal): Standardized rainfall indices for the West and Central Sahel, and the Guinea Coast

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.816398
	Standardized rainfall indices for the West and Central Sahel, and the Guinea Coast
	Fink; Andreas H; Schrage; Jon M; Kotthaus; Simone
发布日期	2010-11-08
数据集类型	dataset
英文简介	For years, various indices of seasonal West African precipitation have served as useful predictors of the overall tropical cyclone activity in the Atlantic Ocean. Since the mid-1990s, the correlation unexpectedly deteriorated. In the present study, statistical techniques are developed to describe the nonstationary nature of the correlations between annual measures of Atlantic tropical cyclone activity and three selected West African precipitation indices (namely, western Sahelian precipitation in June-September, central Sahelian precipitation in June-September, and Guinean coastal precipitation in the preceding year's August-November period). The correlations between these parameters are found to vary over the period from 1921 to 2007 on a range of time scales. Additionally, considerable year-to-year variability in the strength of these correlations is documented by selecting subsamples of years with respect to various meteorological factors. Broadly, in years when the environment in the main development region is generally favorable for enhanced tropical cyclogenesis (e.g., when sea surface temperatures are high, when there is relatively little wind shear through the depth of the troposphere, or when the relative vorticity in the midtroposphere is anomalously high), the correlations between indices of West African monsoon precipitation and Atlantic tropical cyclone activity are considerably weaker than in years when the overall conditions in the region are less conducive. Other more remote climate parameters, such as the phase of the Southern Oscillation, are less effective at modulating the nature of these interactions.
空间范围	Median Latitude: 12.833333 * Median Longitude: -4.000000 * South-bound Latitude: 9.000000 * West-bound Longitude: -15.000000 * North-bound Latitude: 15.000000 * East-bound Longitude: 5.000000
时间范围	1921-01-01T00:00:00 - 2007-01-01T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/219999
推荐引用方式 GB/T 7714	Fink,Andreas H,Schrage,et al. Standardized rainfall indices for the West and Central Sahel, and the Guinea Coast.2010-11-08.https://doi.org/10.1594/PANGAEA.816398.