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FCFA Research Consortium Summary - IMPALA

Roy Bouwer (SouthSouthNorth); Lulueka Dlamini (SouthSouthNorth); Catherine Senior (Met Office)

This brief provides a summary of the IMPALA research consortium which carried out pan-Africa climate science and climate change research as part of the FCFA programme. IMPALA aimed to improve the understanding of Africa's climate and the mechanisms of future…

African Easterly Jet South: control, maintenance mechanisms and link with Southern subtropical waves

Giresse Kuete, Wilfried Pokam Mba & Richard Washington

The African Easterly Jet South (AEJ-S) is an important feature of the central African mid tropospheric circulation and has been identified as a key contributor to convection over the region. This study uses 21-year (1983–2003) Reanalysis data sets of ERA-Interim,…

Regional differences in the response of rainfall to convectively coupled Kelvin waves over tropical Africa

Lawrence S. Jackson, Richard J. Keane, Declan L. Finney, John H. Marsham, Douglas J. Parker, Catherine A. Senior, and Rachel A. Stratton

The representation of convection remains one of the most important sources of bias in global models, and evaluation methods are needed that show that models provide the correct mean state and variability, both for the correct reasons. Here we develop…

In situ constraints on the vertical distribution of global aerosol

Watson-Parris, D., Schutgens, N., Reddington, C., Pringle, K.J., Liu, D., Allan, J.D., Coe, H., Carslaw, K.S. and Stier, P.

Despite ongoing efforts, the vertical distribution of aerosols globally is poorly understood. This in turn leads to large uncertainties in the contributions of the direct and indirect aerosol forcing on climate. Using the Global Aerosol Synthesis and Science Project (GASSP)…

The impact of air–sea coupling and ocean biases on the seasonal cycle of southern West African precipitation

Wainwright, C. M., Hirons, L. C., Klingaman, N. P., Allan, R. P., Black, E., & Turner, A. G.

The biannual seasonal rainfall regime over the southern part of West Africa is characterised by two wet seasons, separated by the ‘Little Dry Season’ in July–August. Lower rainfall totals during this intervening dry season may be detrimental for crop yields…

Press release: Met Office leads ground-breaking research collaboration on modelling African climate, showing enhanced future changes in wet and dry extremes

Jean-Pierre Roux, Zablone Owiti, Beth Mackay, Elizabeth Kendon, Cath Senior, Dave Rowell, John Marsham, Rachel James, Wilfried Pokam

A 4-year investment into one of the most ambitious research collaborations to date that focuses on African climate has delivered far-reaching results to advance international climate science. The international collaboration, led by the Met Office, the UK’s national meteorological service, has developed the first…

Evaluation of Regional‐Scale Soil Moisture‐Surface Flux Dynamics in Earth System Models Based on Satellite Observations of Land Surface Temperature

Belen Gallego‐Elvira, Christopher M. Taylor, Phil P. Harris, and Darren Ghent

There is a lack of high‐quality global observations to evaluate soil drying impacts on surface fluxes in Earth system models (ESMs). Here we use a novel diagnostic based on the observed warming of the land relative to the atmosphere during…

The Impact of Indian Ocean Mean-State Biases in Climate Models on the Representation of the East African Short Rains

Linda Hirons and Andrew Turner

The role of the Indian Ocean dipole (IOD) in controlling interannual variability in the East African short rains, from October to December, is examined in state-of-the-art models and in detail in one particular climate model. In observations, a wet short-rainy…

Significantly increased extreme precipitation expected in Europe and North America from extratropical cyclones

Matt Hawcroft, Ella Walsh, Kevin Hodges and Giuseppe Zappa

For the Northern Hemisphere extratropics, changes in the mid-latitude storm tracks are key to understanding the impacts of climate warming, but projections of their future location in current climate models are affected by large uncertainty. Here, we show that in…

Mesoscale Circulations and Organized Convection in African Easterly Waves

Lorenzo Tomassini

Global convection-permitting model simulations and remote sensing observations are used to investigate the interaction between organized convection, both moist and dry, and the atmospheric circulation in the case of an African easterly wave (AEW). The wave disturbance is associated with…