Impact of GCM boundary forcing on regional climate modeling of West African summer monsoon precipitation and circulation features

2016 ◽  
Vol 48 (5-6) ◽  
pp. 1503-1516 ◽  
Author(s):  
Ibourahima Kebe ◽  
Mouhamadou Bamba Sylla ◽  
Jerome Adebayo Omotosho ◽  
Pinghouinde Michel Nikiema ◽  
Peter Gibba ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Climate Modeling ◽  
Regional Climate ◽  
Regional Climate Modeling ◽  
West African ◽  
Monsoon Precipitation

scholarly journals West African monsoon precipitation impacted by the South Eastern Atlantic biomass burning aerosol outflow

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
F. Solmon ◽  
N. Elguindi ◽  
M. Mallet ◽  
C. Flamant ◽  
P. Formenti
Keyword(s):  
Biomass Burning ◽  
Climate Modeling ◽  
Global Climate ◽  
Regional Climate ◽  
Regional Scale ◽  
West African Monsoon ◽  
Regional Climate Modeling ◽  
West African ◽  
African Monsoon ◽  
Low Cloud

AbstractThe West African Monsoon (WAM) is a complex system depending on global climate influences and multiple regional environmental factors. Central and Southern African biomass-burning (SABB) aerosols have been shown to perturb WAM during episodic northward inter-hemispheric transport events, but a possible dynamical connection between the core of the SABB aerosol outflow and the WAM system remains unexplored. Through regional climate modeling experiments, we show that SABB aerosols can indeed impact WAM dynamics via two competitive regional scale and inter-hemispheric dynamical feedbacks originating from (i) enhanced diabatic heating occurring in the Southeastern Atlantic low-cloud deck region, and (ii) aerosol and cloud-induced sea surface temperature cooling. These mechanisms, related to aerosol direct, semi-direct, and indirect effects, are shown to have different seasonal timings, resulting in a reduction of June to September WAM precipitation, while possibly enhancing late-season rainfall in WAM coastal areas.

scholarly journals Effect of the African greenbelt position on West African summer climate: a regional climate modeling study

2018 ◽  
Vol 137 (1-2) ◽  
pp. 309-322 ◽  
Author(s):  
Adama Bamba ◽  
Ismaila Diallo ◽  
N’Datchoh E. Touré ◽  
Kouakou Kouadio ◽  
Abdourahamane Konaré ◽  
...  
Keyword(s):  
Climate Modeling ◽  
Regional Climate ◽  
Regional Climate Modeling ◽  
West African ◽  
Summer Climate ◽  
Modeling Study

scholarly journals Effects of Diurnal Cycle on a Simulated Asian Summer Monsoon

2012 ◽  
Vol 25 (24) ◽  
pp. 8394-8408 ◽  
Author(s):  
Song-You Hong ◽  
Masao Kanamitsu ◽  
Jung-Eun Kim ◽  
Myung-Seo Koo
Keyword(s):  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Diurnal Cycle ◽  
Climate Modeling ◽  
Asian Summer Monsoon ◽  
Regional Climate ◽  
Sensible Heat Flux ◽  
Regional Climate Modeling ◽  
The Tibetan Plateau ◽  
Modeling Framework

Abstract This study investigates the effects of the diurnal cycle on monsoonal circulations over Asia in summer with a focus on precipitation. To this end, two sets of experiments are designed in a regional climate modeling framework forced by reanalysis data. The control experiment is a normal integration in which radiation is computed hourly, whereas the no-diurnal experiment is an experimental integration in which the daily averaged solar flux is computed once a day. Analysis of the results from the two experiments reveals that the diurnal cycle enhances the daily averaged sensible heat flux over land and the latent flux over oceans, which means that daytime net solar heating exceeds nighttime cooling in terms of the effects in surface climate and monsoonal circulations. Seasonal precipitation increased by about 3% over land and 11% over oceans. The surface hydroclimate over land is strongly influenced by the interaction between land and the atmosphere, and results in cooler surface temperatures except over the Tibetan Plateau. Over oceans, a robust increase in precipitation results from enhanced planetary boundary layer mixing. The diurnal cycle over the Tibetan Plateau region is found to decrease surface albedo by melting snow during the daytime, which contributes to the formation of the thermal low near the surface and the Tibetan high in the upper troposphere. The resultant monsoonal precipitation is modulated by an increase (decrease) in precipitation over northern (southern) India. This modulation results in the summer monsoon over East Asia being shifted northward.

scholarly journals Urban Climates and Climate Change

2020 ◽  
Vol 45 (1) ◽  
pp. 411-444 ◽  
Author(s):  
Valéry Masson ◽  
Aude Lemonsu ◽  
Julia Hidalgo ◽  
James Voogt
Keyword(s):  
Climate Change ◽  
Climate Modeling ◽  
Regional Climate ◽  
Urban Climate ◽  
Regional Climate Modeling ◽  
Climate Impact ◽  
Local Climate ◽  
Urban Climatology ◽  
Recent Developments ◽  
Global Agenda

Cities are particularly vulnerable to extreme weather episodes, which are expected to increase with climate change. Cities also influence their own local climate, for example, through the relative warming known as the urban heat island (UHI) effect. This review discusses urban climate features (even in complex terrain) and processes. We then present state-of-the-art methodologies on the generalization of a common urban neighborhood classification for UHI studies, as well as recent developments in observation systems and crowdsourcing approaches. We discuss new modeling paradigms pertinent to climate impact studies, with a focus on building energetics and urban vegetation. In combination with regional climate modeling, new methods benefit the variety of climate scenarios and models to provide pertinent information at urban scale. Finally, this article presents how recent research in urban climatology contributes to the global agenda on cities and climate change.

The state of the art and fundamental aspects of regional climate modeling in South America

2018 ◽  
Vol 1436 (1) ◽  
pp. 98-120 ◽  
Author(s):  
Tércio Ambrizzi ◽  
Michelle Simões Reboita ◽  
Rosmeri Porfírio da Rocha ◽  
Marta Llopart
Keyword(s):  
South America ◽  
State Of The Art ◽  
Climate Modeling ◽  
Regional Climate ◽  
Regional Climate Modeling ◽  
The State
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