Modeling the atmospheric life cycle and radiative impact of mineral dust in the Hadley Centre climate model

Woodward, Stephanie

doi:10.1029/2000jd900795

Cited by 330 publications

(381 citation statements)

References 37 publications

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“…One of them is the latest one obtained by analysis of the aerosol samples collected in western China desert during ADEC experiments as described above (hereafter, noted as ADEC dust model) and another one is the dust model recommend by World Meteorology Organization (WMO) which has been widely used in the studies on dust radiative forcing calculations (Sokolik and Golitsyn 1993, Sokolik and Toon 1998, Woodward 2001.…”

Section: Data Descriptionmentioning

confidence: 99%

Sensitivity Experiments on the Effects of Optical Properties of Dust Aerosols on Their Radiative Forcing under Clear Sky Condition

Shi

Wang

et al. 2005

Journal of the Meteorological Society of Japan

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There are many uncertainties in the quantitative assessment of radiative effects due to atmospheric dust aerosol and the optical properties of dust particles contribute large to them. Numerical sensitivity experiments to evaluate the impacts of optical characteristics on the radiative forcing have been performed in this study. The experiments involve the effects of refractive indices, single scattering albedo, asymmetry factor and optical depth of the dust particles. An updated data set of refractive indices representing East Asian dust and the data set recommended by World Meteorology Organization (WMO) are used in our calculations for comparison. A k-distribution model for solar and thermal radiation transfer is employed in the calculation of radiative forcing. It is found that comparing with the WMO model, East Asian dust model has stronger scattering and weaker absorption at solar regime, which leads to higher negative forcing at the top of atmosphere (TOA) in this study. The more important is the signs of radiative forcing at TOA over certain regions could be reversed for the two dust models, which emphasizes the essentiality of accurate measurements of optical properties of dust aerosols for quantitatively estimating their radiative forcing.

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Section: Data Descriptionmentioning

confidence: 99%

Sensitivity Experiments on the Effects of Optical Properties of Dust Aerosols on Their Radiative Forcing under Clear Sky Condition

Shi

Wang

et al. 2005

Journal of the Meteorological Society of Japan

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“…The WAM regulates the seasonal cycle of dry and wet seasons in response to annual cycle in solar forcing. The Sahara desert over West Africa is the largest source of mineral dust aerosol in the world (e.g., Woodward, 2001;Prospero et al, 2003). The Saharan dust emitted during the WAM season can significantly affect the WAM development and precipitation, because it interacts with both shortwave (SW) and longwave (LW) radiation, and modifies the radiative and physical properties of clouds (e.g., Miller et al, 2004;Yoshioka et al, 2007;Konare et al, 2008;Lau et al, 2009;Kim et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Radiative impact of mineral dust on monsoon precipitation variability over West Africa

et al. 2011

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Abstract. The radiative forcing of dust and its impact on precipitation over the West Africa monsoon (WAM) region is simulated using a coupled meteorology and aerosol/chemistry model (WRF-Chem). During the monsoon season, dust is a dominant contributor to aerosol optical depth (AOD) over West Africa. In the control simulation, on 24-h domain average, dust has a cooling effect (−6.11 W m −2 ) at the surface, a warming effect (6.94 W m −2 ) in the atmosphere, and a relatively small TOA forcing (0.83 W m −2 ). Dust modifies the surface energy budget and atmospheric diabatic heating. As a result, atmospheric stability is increased in the daytime and reduced in the nighttime, leading to a reduction of late afternoon precipitation by up to 0.14 mm/h (25%) and an increase of nocturnal and early morning precipitation by up to 0.04 mm/h (45%) over the WAM region. Dust-induced reduction of diurnal precipitation variation improves the simulated diurnal cycle of precipitation when compared to measurements. However, daily precipitation is only changed by a relatively small amount (−0.17 mm/day or −4%). The dust-induced change of WAM precipitation is not sensitive to interannual monsoon variability. On the other hand, sensitivity simulations with weaker to stronger absorbing dust (in order to represent the uncertainty in dust solar absorptivity) show that, at the lower atmosphere, dust longwave warming effect in the nighttime surpasses its shortwave cooling effect in the daytime; this leads to a less stable atmosphere associated with more convective precipitation in the nighttime. As a result, the dust-induced change of daily WAM precipitation varies from a significant reduction of −0.52 mm/day (−12%, weaker absorbing dust) to a small increase of 0.03 mm/day (1%, stronger absorbing dust). This variation originates from the competition between dust impact on daytime and nightCorrespondence to: C. Zhao (chun.zhao@pnl.gov) time precipitation, which depends on dust shortwave absorption. Dust reduces the diurnal variation of precipitation regardless of its absorptivity, but more reduction is associated with stronger absorbing dust.

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“…Indeed, the Sahara desert acts as the strongest source of mineral dust aerosol in the world (Woodward, 2001;Prospero et al, 2003). The most intense dust events in Sahara and Sahelian regions are frequently generated in summer (Marticorena et al, 1997) due to favourable large scale conditions, but there is also a significant dust production throughout the year.…”

Section: Introductionmentioning

confidence: 99%

Impact of dust aerosols on the radiative budget, surface heat fluxes, heating rate profiles and convective activity over West Africa during March 2006

et al. 2009

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Abstract. The present work analyses the effect of dust aerosols on the surface and top of atmosphere radiative budget, surface temperature, sensible heat fluxes, atmospheric heating rate and convective activity over West Africa. The study is focused on the regional impact of a major dust event over the period of 7-14 March 2006 through numerical simulations performed with the mesoscale, nonhydrostatic atmospheric model MesoNH. Due to its importance on radiative budgets, a specific attention has been paid to the representation of dust single scattering albedo (SSA) in MesoNH by using inversions of the AErosol RObotic NETwork (AERONET). The radiative impacts are estimated using two parallel simulations, one including radiative effects of dust and the other without them. The simulations of dust aerosol impacts on the radiative budget indicate remarkable instantaneous (at midday) decrease of surface shortwave (SW) radiations over land, with regional (9 • -17 • N, 10 • W-20 • E) mean of −137 W/m 2 during the 9 to 12 March period. The surface dimming resulting from the presence of dust is shown to cause important reduction of both surface temperature (up to 4 • C) and sensible heat fluxes (up to 100 W/m 2 ), which is consistent with experimental observations. At the top of the atmosphere, the SW cooling (regional mean of

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Modeling the atmospheric life cycle and radiative impact of mineral dust in the Hadley Centre climate model

Cited by 330 publications

References 37 publications

Sensitivity Experiments on the Effects of Optical Properties of Dust Aerosols on Their Radiative Forcing under Clear Sky Condition

Sensitivity Experiments on the Effects of Optical Properties of Dust Aerosols on Their Radiative Forcing under Clear Sky Condition

Radiative impact of mineral dust on monsoon precipitation variability over West Africa

Impact of dust aerosols on the radiative budget, surface heat fluxes, heating rate profiles and convective activity over West Africa during March 2006

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