Climatology of convective available potential energy (<scp>CAPE</scp>) in <scp>ERA</scp>‐Interim reanalysis over West Africa

Meukaleuni, Cyrille; Lenouo, André; Monkam, David

doi:10.1002/asl.601

Cited by 20 publications

(16 citation statements)

References 22 publications

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“…The change of sign yields in a net decrease during 36 years from the dry period (OND and JFM) to the wet season (AMJ and JAS) in the band of latitudes 10°N around Chad and Niger can be due to the migration of the ITCZ which is also linked to the southward decrease of convective available potential energy (CAPE) during the both periods. A similar result on the seasonal study of CAPE trends was found by Meukaleuni et al (2016).…”

Section: Climatology and Trends Of Blhsupporting

confidence: 86%

“…If 95% confidence intervals for two seasonal means are calculated (approximately) by adding or subtracting two standard errors, the intervals do not overlap, so the difference in means is statistically very significant. The magnitude of a given trend is estimated by linear regression, although the error is rarely normally distributed in BLH (Meukaleuni et al 2016). For more discussion of the linear trend model, see Nau 2014.…”

Section: Methodsmentioning

confidence: 99%

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Climatology of West Africa boundary layer

Ndao¹,

Lenouo²,

Badiane³

et al. 2020

Terr. Atmos. Ocean. Sci.

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Monthly means, seasonal variances, and trends of a global climatology boundary layer height (BLH) over West Africa are presented based on 36 years (1979 -2014) of six-hourly ERA-Interim reanalysis. In this region, we found that there is a link between the West Africa Monsoon (WAM) and the monthly means of BLH where largest values of BLH variances are developed in the tropics close to the Inter Tropical Convergence Zone (ITCZ). High temperatures and sufficient moisture are also available close this area. Seasonal trend magnitudes vary from -20 to 20 m per decade during the period 1979 -2014 and characterize by negative trend over east of the Sahara region. Trends are only included in the analysis, if their probability exceeds the 95% significance level. Case study of diurnal variation was done during the African monsoon multidisciplinary analyses Special Observing Period 3 (AMMA SOP3) experiment (August 2006). We found that the lower boundary-layer appears around 875 hPa in the monsoon layer where the wind decreases at midday in interaction through exchange processes with air originating from above the boundary layer. In the same time, the dust in Saharan Air Layer (SAL) seems to modify the atmospheric boundary layer (ABL) thermodynamic attributes by altering the shortwave and longwave radiative budget.

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Section: Climatology and Trends Of Blhsupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Climatology of West Africa boundary layer

Ndao¹,

Lenouo²,

Badiane³

et al. 2020

Terr. Atmos. Ocean. Sci.

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“…Another important indicator of PBL dynamics is the CAPE, which manifests the atmospheric instability and the potential density of deep convection and has been widely used in convective precipitation prediction, severe weather analysis and forecasting, cumulus parameterization in general circulation models, etc. (Donner & Phillips, ; Meukaleuni et al, ; Washington & Parkinson, ). Previous observational studies show that the variability of the CAPE is largely dominated by PBL thermodynamic properties (Donner & Phillips, ; McBride & Frank, ; Zhang, ).…”

Section: Methodsmentioning

confidence: 99%

The Regional Impact of Urban Heat Mitigation Strategies on Planetary Boundary Layer Dynamics Over a Semiarid City

Jooho

Wang

2018

JGR Atmospheres

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The rapid urbanization and associated landscape changes strongly modulate heat and moisture transfer processes on the urban surface as well as in the planetary boundary layer (PBL) via urban landatmosphere interactions. In this study, we employed the mesoscale Weather Research and Forecasting (WRF) model with realistic urban dynamics to assess the effects of two urban landscaping strategies for urban heat mitigation (viz., green roofs and white roofs) on the PBL dynamics for hot summer periods over a semiarid city, Phoenix of Arizona. Our results show that the effects of green roofs and white roofs on PBL dynamics are markedly different at daytime and nighttime. At daytime, both roofing systems reduce the sensible heat flux significantly by~150 W/m 2 , lower the PBL height by~700 m, and decrease the maximum convective available potential energy (CAPE) by~40 J/kg over the built terrain. At nighttime, both sensible and latent heat fluxes increase with green roofs by~4 and~6 W/m 2 , respectively. In contrast, with white roofs, a marginal reduction of sensible heat flux by~4 W/m 2 was observed, owing to the remnant effect of daytime cooling. In addition, both roofing systems reduce the CAPE over the urban core but increase the CAPE over the rural surrounding, implying that the use of green or white roofs may potentially enhance the probability of precipitation toward the outskirt of the city. 2011; Yang et al., 2016). These impact of modified urban surface hydrothermal processes, in turn, will be SONG ET AL. 6410

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“…Climatology of CAPE presented in terms of seasonal means, variances and FIGURE 1. Rainfall: a -convectional, b -cyclonic/frontal, c -cyclonic (Gabler et al, 2009) a b c trends shows large values toward 12°--16° N with maxima during summer, according to higher relative humidity due to the arrival of monsoon in West Africa (Meukaleuni, Lenouo & Monkam, 2016). Also, their synoptic study of the role of convective available potential energy on formation rainstorm over Iraq and resulted in convectional precipitation coincides convective available potential energy this due to Low Mediterranean Sea and Low Sudanese and the northern regions of Iraq have the highest CAPE, followed by the central regions and southern regions, accompanied by the highest rainfall values (Namdar, 2017).…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of the convective available potential energy by precipitation over Iraq using ECMWF data for the period of 1989–2018

Al-Taai

Abbood

2020

srees

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The Convective Available Potential Energy (CAPE) represents the amount of energy for a sample of air. The sample departs vertically within the atmosphere and through these values the potential energy to predict the extreme weather conditions such as storms, hurricanes, lightning and thunder. Data are taken by CAPE, convective precipitation (Cp) and total precipitation (Tp) from satellites recorded by the European Centre for Medium-Range Weather Forecasts (ECMWF). The choice of 30 years (1989– –2018) over Iraq station between two latitudes (29.5°–37.22° N) and two longitudes (48.45°–38.45° E). Otherwise, we have studied total yearly mean of CAPE, Cp and Tp over Iraq, the total monthly mean of CAPE, Cp and Tp for the selected station, as well as the relationship between of CAPE, Cp and Tp for the selected station. The results showed that the highest total yearly mean of CAPE, Cp and Tp over Iraq was included northern stations and lowest was included central and southern stations. The highest total monthly mean of CAPE, Cp and Tp for Zakho station. The relationship between the CAPE and Cp is positive and the relationship between CAPE and Tp is positive too at five stations but Mosul station represents very high correlation while Zakho station represents the low correlation.

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Climatology of convective available potential energy (CAPE) in ERA‐Interim reanalysis over West Africa

Cited by 20 publications

References 22 publications

Climatology of West Africa boundary layer

Climatology of West Africa boundary layer

The Regional Impact of Urban Heat Mitigation Strategies on Planetary Boundary Layer Dynamics Over a Semiarid City

Analysis of the convective available potential energy by precipitation over Iraq using ECMWF data for the period of 1989–2018

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