A 3-D evaluation of the MACC reanalysis dust product over Europe, northern Africa and Middle East using CALIOP/CALIPSO dust satellite observations

Georgoulias, Aristeidis K.; Tsikerdekis, Athanasios; Amiridis, Vassilis; Marinou, Eleni; Benedetti, Angela; Zanis, Prodromos; Alexandri, Georgia; Mona, Lucia; Kourtidis, Konstantinos; Lelieveld, Jos

doi:10.5194/acp-18-8601-2018

Cited by 25 publications

(18 citation statements)

References 59 publications

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“…Thus, Wet_Dep improves the AOD bias score by slightly underestimating it; additionally, it reduces RMSE. Such improvements substantially correct the spatiotemporal distribution of the suspended dust throughout the simulation period and are contributing factors to the reduction of its well-known dust concentration overestimation problem [60,64,[76][77][78].…”

Section: Discussionmentioning

confidence: 98%

The Implementation of a Mineral Dust Wet Deposition Scheme in the GOCART-AFWA Module of the WRF Model

et al. 2018

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The principal objective of this study is to present and evaluate an advanced dust wet deposition scheme in the Weather and Research Forecasting model coupled with Chemistry (WRF-Chem). As far as the chemistry component is concerned, the Georgia Tech Goddard Global Ozone Chemistry Aerosol Radiation and Transport of the Air Force Weather Agency (GOCART-AFWA) module is applied, as it supports a binary scheme for dust emissions and transport. However, the GOCART-AFWA aerosol module does not incorporate a wet scavenging scheme, nor does it interact with cloud processes. The integration of a dust wet deposition scheme following Seinfeld and Pandis into the WRF-Chem model is assessed through a case study of large-scale Saharan dust transport over the Eastern Mediterranean that is characterized by severe wet deposition over Greece. An acceptable agreement was found between the calculated and measured near surface PM10 concentrations, as well as when model estimated atmospheric optical depth (AOD) was validated against the AERONET measurements, indicating the validity of our dust wet deposition scheme.

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Section: Discussionmentioning

confidence: 98%

The Implementation of a Mineral Dust Wet Deposition Scheme in the GOCART-AFWA Module of the WRF Model

et al. 2018

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“…A mean bias of 25% was found between MACC and LIVAS, a dust product based on CALIPSO observations over Europe, northern Africa and Middle East (Georgoulias et al, 2018). Additionally, the correlation between MACC and AERONET was found to range from 0.6 over the Sahara and Sahel to 0.8 over typical regions of dust transport (Cuevas et al, 2015).…”

Section: Macc and Era-interimmentioning

confidence: 90%

The day-to-day co-variability between mineral dust and cloud glaciation: A proxy for heterogeneous freezing

Villanueva¹,

Heinold²,

Seifert³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> To estimate the global co-variability between mineral dust aerosol and cloud glaciation, an aerosol model reanalysis was combined with satellite retrievals of cloud thermodynamic phase. We used the CALIPSO-GOCCP and DARDAR products from the A-Train satellite constellation to obtain the cloud phase and the MACC reanalysis to estimate the dust mixing-ratio in the atmosphere. Night-time retrievals within a temperature range from +3&#8201;&#176;C to &#8722;42&#8201;&#176;C for the period 2007&#8211;2010 were included. The results confirm that the cloud thermodynamic phase is highly dependent on temperature and latitude. However, at mid- and high latitudes, at equal temperature and within narrow constrains for humidity and static stability the average frequency of fully glaciated clouds increase by +5 to +10&#8201;% for higher mineral dust mixing-ratios. The differentiation between humidity-stability regimes reduced the confounding influence of meteorology on the observed relationship between dust and cloud ice. Furthermore, for similar mixing-ratios of mineral dust the cloud ice occurrence-frequency in the Northern Hemisphere was found to be higher than in the Southern Hemisphere at &#8722;30&#8201;&#176;C but lower at &#8722;15&#8201;&#176;C. This may suggest a difference in the susceptibility of cloud glaciation to the presence of dust. Based on previous studies, the differences at &#8722;15&#8201;&#176;C could be explained by higher feldspar fractions in the Southern Hemisphere, while the differences at &#8722;30&#8201;&#176;C may be explained by the higher freezing efficiency of clay minerals in the Northern Hemisphere.</p>

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“…A minimum dust AOD value of 0.3 was set-where needed-in defining the areas impacted by dust to ensure the presence of dust in the atmosphere over the Hellenic Seas. Evaluations of the ECMWF/MACC (Monitoring Atmospheric Composition and Climate) AOD re-analysis at visible wavelengths against measurements and observations showed that it presents an overestimation when dust load is low especially during spring, summer and autumn and an underestimation for values >0.3 [60], while a root mean square difference from observations of about 0.25 was reported for Thessaloniki AERONET (AErosol RObotic NETwork) station [61]. In addition, during the summer and autumn events of the present study, PM10 values <50 were observed when the forecasted dust AOD was <0.25.…”

Section: Methodsmentioning

confidence: 99%

Exploring Possible Influence of Dust Episodes on Surface Marine Chlorophyll Concentrations

Kotta

Kitsiou

2019

JMSE

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Desert dust deposition is thought to act as fertilizer for phytoplankton growth, since it is rich in the required nutrients. The Mediterranean Sea is a nutrient poor marine environment—with its eastern part being the most oligotrophic—which is subject to dust transport. The Hellenic Seas are part of this low-nutrient, low-chlorophyll environment and they are also affected by dust deposition events. Thus, the dust fertilizing effect can be particularly important, especially during the stratification period, when the nutrients needed for phytoplankton growth are not imported from deeper layers. Some individual dust events are examined here in respect of their possible influence on phytoplankton, through the observed variations of satellite derived chlorophyll concentrations. Two strong dust events that were also extreme weather events and three events in the June–September stratification period are examined for the Hellenic Seas as well as a strong dust event in the Central Mediterranean Sea. The results, only when based on absolute chlorophyll differences above 50%, show that dust events seem to favour phytoplankton abundance mainly during the low productive period; however, these differences are area-limited. The difficulty of reaching safe results through specific dust events and discriminating between other meteorological factors favouring phytoplankton growth are also discussed.

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A 3-D evaluation of the MACC reanalysis dust product over Europe, northern Africa and Middle East using CALIOP/CALIPSO dust satellite observations

Cited by 25 publications

References 59 publications

The Implementation of a Mineral Dust Wet Deposition Scheme in the GOCART-AFWA Module of the WRF Model

The Implementation of a Mineral Dust Wet Deposition Scheme in the GOCART-AFWA Module of the WRF Model

The day-to-day co-variability between mineral dust and cloud glaciation: A proxy for heterogeneous freezing

Exploring Possible Influence of Dust Episodes on Surface Marine Chlorophyll Concentrations

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