2012
DOI: 10.1002/qj.2062
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Impact of soil moisture and convectively generated waves on the initiation of a West African mesoscale convective system

Abstract: A mesoscale convective system (MCS) case study was observed over northeast Mali as part of the African Monsoon Multidisciplinary Analysis (AMMA) on 31 July 2006. Observations of this case suggest that the soil-moisture heterogeneity and atmospheric gravity waves emitted from a 'parent' MCS were important trigger mechanisms for this system. This study uses high-resolution Met Office Unified Model (MetUM) simulations to assess the importance of the synoptic circulation, land-surface and gravity waves in the init… Show more

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Cited by 32 publications
(29 citation statements)
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References 78 publications
(100 reference statements)
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“…The study domain extends from the tropical forest in the south to the Sahara Desert in the north (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) • N, 20 • W-40 • E) and encompasses the entire Sahel (a well-known hot spot of land-atmosphere interactions) [47][48][49] (Figure 1a). Most of the annual rainfall in the region occurs during the monsoon months of June-September and is of convective origin [50].…”
Section: Study Domainmentioning
confidence: 99%
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“…The study domain extends from the tropical forest in the south to the Sahara Desert in the north (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) • N, 20 • W-40 • E) and encompasses the entire Sahel (a well-known hot spot of land-atmosphere interactions) [47][48][49] (Figure 1a). Most of the annual rainfall in the region occurs during the monsoon months of June-September and is of convective origin [50].…”
Section: Study Domainmentioning
confidence: 99%
“…The large uncertainty in the feedback remains within the indirect path of soil moisture-rainfall coupling at convective scales, i.e., (sub-)daily and 10-100 km. Multiple modeling studies and limited observational evidence agree on the mechanisms governing the effect of soil moisture on deep convection triggering [14,15]. However, the influence of soil moisture state on rainfall and its properties, such as volume or timing, remains less studied and is expected to be more subtle [16].…”
Section: Introductionmentioning
confidence: 99%
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“…However, over Niger and Chad the dust uplift is close to the climatology or is anomalously low. The position of the SHL suggests that the anomalously strong AODs are generated by the lifting of dust by low-level jets over Algeria (e.g., Birch et al 2013) and the strong winds linked to the Atlantic inflow region over western Sahara and Mauritania (e.g., Grams et al 2010). The composite TRMM rainfall for DAY 2 5 indicates a strong north-south gradient with less rain in the north and more in the south of the box.…”
Section: ) Dust Upliftmentioning
confidence: 99%
“…Marsham et al (2011) highlight disagreement between analyses in the Saharan heat low region. Birch et al (2013), Schepanski et al (2014), and Roberts and Knippertz (2014) highlight the sensitivity of high-resolution simulations over West Africa to differing initial conditions from (re)analysis products. In Roberts and Knippertz (2014) several products [the Global Forecast System operational analysis, the Interim European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-Interim), and the ECMWF operational analysis] were used to initialize high-resolution simulations using the same Weather Research and Forecasting Model setup.…”
Section: Introductionmentioning
confidence: 99%