Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/acp-19-6893-2019 |
The sensitivity of the colour of dust in MSG-SEVIRI Desert Dust infrared composite imagery to surface and atmospheric conditions | |
Banks, Jamie R.1; Huenerbein, Anja1; Heinold, Bernd1; Brindley, Helen E.2,3; Deneke, Hartwig1; Schepanski, Kerstin1 | |
通讯作者 | Banks, Jamie R. |
来源期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:10页码:6893-6911 |
英文摘要 | Infrared Desert Dust composite imagery taken by the Spinning Enhanced Visible and InfraRed Imager (SEVIRI), onboard the Meteosat Second Generation (MSG) series of satellites above the equatorial East Atlantic, has been widely used for more than a decade to identify and track the presence of dust storms from and over the Sahara Desert, the Middle East, and southern Africa. Dust is characterised by distinctive pink colours in the Desert Dust false-colour imagery; however, the precise colour is influenced by numerous environmental properties, such as the surface thermal emissivity and skin temperature, the atmospheric water vapour content, the quantity and height of dust in the atmosphere, and the infrared optical properties of the dust itself. For this paper, simulations of SEVIRI infrared measurements and imagery have been performed using a modelling system, which combines dust concentrations simulated by the aerosol transport model COSMO-MUSCAT (COSMO: COnsortium for Small-scale MOdelling; MUSCAT: MUltiScale Chemistry Aerosol Transport Model) with radiative transfer simulations from the RTTOV (Radiative Transfer for TOVS) model. Investigating the sensitivity of the synthetic infrared imagery to the environmental properties over a 6-month summertime period from 2011 to 2013, it is confirmed that water vapour is a major control on the apparent colour of dust, obscuring its presence when the moisture content is high. Of the three SEVIRI channels used in the imagery (8.7, 10.8, and 12.0 mu m), the channel at 10.8 mu m has the highest atmospheric transmittance and is therefore the most sensitive to the surface skin temperature. A direct consequence of this sensitivity is that the background desert surface exhibits a strong diurnal cycle in colour, with light blue colours possible during the day and purple hues prevalent at night. In dusty scenes, the clearest pink colours arise from high-altitude dust in dry atmospheres. Elevated dust influences the dust colour primarily by reducing the contrast in atmospheric transmittance above the dust layer between the SEVIRI channels at 10.8 and 12.0 mu m, thereby boosting red and pink colours in the imagery. Hence, the higher the dust altitude, the higher the threshold column moisture needed for dust to be obscured in the imagery: for a sample of dust simulated to have an aerosol optical depth (AOD) at 550 nm of 2-3 at an altitude of 3-4 km, the characteristic colour of the dust may only be impaired when the total column water vapour is particularly moist (greater than or similar to 39 mm). Meanwhile, dust close to the surface (altitude < 1 km) is only likely to be apparent when the atmosphere is particularly dry and when the surface is particularly hot, requiring column moisture less than or similar to 13mm and skin temperatures less than or similar to 314 K, and is highly unlikely to be apparent when the skin temperature is less than or similar to 300 K. Such low-altitude dust will regularly be almost invisible within the imagery, since it will usually be beneath much of the atmospheric water vapour column. It is clear that the interpretation of satellite-derived dust imagery is greatly aided by knowledge of the background environment. |
类型 | Article |
语种 | 英语 |
国家 | Germany ; England |
开放获取类型 | gold, Green Submitted |
收录类别 | SCI-E |
WOS记录号 | WOS:000468810000002 |
WOS关键词 | SAHARAN HEAT LOW ; RADIATIVE-TRANSFER MODEL ; MINERAL DUST ; SATELLITE DETECTION ; OPTICAL-PROPERTIES ; REFRACTIVE-INDEX ; AEROSOL ; VARIABILITY ; AFRICA ; CLOUDS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/214474 |
作者单位 | 1.Leibniz Inst Tropospher Res TROPOS, Leipzig, Germany; 2.Imperial Coll London, Space & Atmospher Phys Grp, London, England; 3.Imperial Coll London, NERC Natl Ctr Earth Observat, London, England |
推荐引用方式 GB/T 7714 | Banks, Jamie R.,Huenerbein, Anja,Heinold, Bernd,et al. The sensitivity of the colour of dust in MSG-SEVIRI Desert Dust infrared composite imagery to surface and atmospheric conditions[J],2019,19(10):6893-6911. |
APA | Banks, Jamie R.,Huenerbein, Anja,Heinold, Bernd,Brindley, Helen E.,Deneke, Hartwig,&Schepanski, Kerstin.(2019).The sensitivity of the colour of dust in MSG-SEVIRI Desert Dust infrared composite imagery to surface and atmospheric conditions.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(10),6893-6911. |
MLA | Banks, Jamie R.,et al."The sensitivity of the colour of dust in MSG-SEVIRI Desert Dust infrared composite imagery to surface and atmospheric conditions".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.10(2019):6893-6911. |
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