气候变化领域集成服务门户(CCPortal): Variability of the Turkana Low-Level Jet in Reanalysis and Models: Implications for Rainfall

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DOI	10.1029/2020JD034154
	Variability of the Turkana Low-Level Jet in Reanalysis and Models: Implications for Rainfall
	King J.A.; Engelstaedter S.; Washington R.; Munday C.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	The complex topography of East Africa poses challenges for accurate modeling of regional climate. The Turkana Channel in northwestern Kenya is an important feature because of a persistent low-level jet (LLJ) that blows through it, which has complex interactions with local and regional rainfall. We establish the annual cycle and interannual variability of the LLJ in the ERA5, MERRA-2, and JRA-55 reanalyses. The jet is strongest during wet seasons in the surrounding region. Results suggest a statistically significant weakening of the LLJ over the last 30–40 years in two out of the three reanalyses. We propose an explanation based on the jet's relationship with regional warming patterns and zonal surface pressure gradients, which link the jet to larger-scale climate dynamics including the Walker Circulation. If these changes continue in the future, there may be significant implications for rainfall including increases in northwest Kenya and decreases further inland. However, the global models used to produce climate projections vary in their simulations of the LLJ in part because they represented topography. Consequently, it is not possible to assess how future LLJ changes will affect regional climate using CMIP5 models alone. Differences between the reanalyses preclude their direct use for model evaluation. Improving the processes by which topographical observations are mapped onto model grids could lead to improvements in the simulation of the East African climate. A field campaign to measure the LLJ directly could resolve uncertainties in the literature, help constrain reanalyses, and determine which models have the most realistic LLJ representation. © 2021. The Authors.
英文关键词	climate; CMIP5; East Africa; low-level jets; rainfall; reanalysis
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185211
作者单位	School of Geography and the Environment, University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	King J.A.,Engelstaedter S.,Washington R.,et al. Variability of the Turkana Low-Level Jet in Reanalysis and Models: Implications for Rainfall[J],2021,126(10).
APA	King J.A.,Engelstaedter S.,Washington R.,&Munday C..(2021).Variability of the Turkana Low-Level Jet in Reanalysis and Models: Implications for Rainfall.Journal of Geophysical Research: Atmospheres,126(10).
MLA	King J.A.,et al."Variability of the Turkana Low-Level Jet in Reanalysis and Models: Implications for Rainfall".Journal of Geophysical Research: Atmospheres 126.10(2021).