Impact of soil moisture on dust outbreaks in East Asia: Using satellite and assimilation data

Kim, Hyunglok; Choi, Minha

doi:10.1002/2015gl063325

Cited by 74 publications

(43 citation statements)

References 42 publications

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“…In addition, vegetation‐atmosphere interactions and dust‐climate feedbacks are also important processes in local atmosphere‐land interactions, despite their impacts on each other. Decreased soil moisture can markedly enhance dust outbreaks under certain wind conditions [ Kim and Choi , ]. The ability of atmospheric dust to suppress precipitation can contribute to a positive desertification feedback whereby plant mortality and enhanced dust emissions result from the reduced vegetation cover [ Rosenfeld et al ., ; Huang et al ., ].…”

Section: Impacts Of Atmosphere‐land Interactionsmentioning

confidence: 99%

Dryland climate change: Recent progress and challenges

Huang

et al. 2017

Reviews of Geophysics

591

331

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Drylands are home to more than 38% of the world's population and are one of the most sensitive areas to climate change and human activities. This review describes recent progress in dryland climate change research. Recent findings indicate that the long‐term trend of the aridity index (AI) is mainly attributable to increased greenhouse gas emissions, while anthropogenic aerosols exert small effects but alter its attributions. Atmosphere‐land interactions determine the intensity of regional response. The largest warming during the last 100 years was observed over drylands and accounted for more than half of the continental warming. The global pattern and interdecadal variability of aridity changes are modulated by oceanic oscillations. The different phases of those oceanic oscillations induce significant changes in land‐sea and north‐south thermal contrasts, which affect the intensity of the westerlies and planetary waves and the blocking frequency, thereby altering global changes in temperature and precipitation. During 1948–2008, the drylands in the Americas became wetter due to enhanced westerlies, whereas the drylands in the Eastern Hemisphere became drier because of the weakened East Asian summer monsoon. Drylands as defined by the AI have expanded over the last 60 years and are projected to expand in the 21st century. The largest expansion of drylands has occurred in semiarid regions since the early 1960s. Dryland expansion will lead to reduced carbon sequestration and enhanced regional warming. The increasing aridity, enhanced warming, and rapidly growing population will exacerbate the risk of land degradation and desertification in the near future in developing countries.

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Section: Impacts Of Atmosphere‐land Interactionsmentioning

confidence: 99%

Dryland climate change: Recent progress and challenges

Huang

et al. 2017

Reviews of Geophysics

591

331

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“…In such cases, higher wind speeds are required to uplift dust particles. Overall, similar conclusions have been obtained by Kim and Choi [] who have compared the MODIS Deep Blue AOD (column atmospheric) to the wind speed and soil moisture from Global Land Data Assimilation System (GLDAS/NOAH). However, the transported aerosols, which are not affected by the soil moisture and wind speed, from the surrounding areas could significantly impact the results.…”

Section: Resultsmentioning

confidence: 99%

Dust emission parameterization scheme over the MENA region: Sensitivity analysis to soil moisture and soil texture

Gherboudj

Beegum

Marticorena

et al. 2015

J. Geophys. Res. Atmos.

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The mineral dust emissions from arid/semiarid soils were simulated over the MENA (Middle East and North Africa) region using the dust parameterization scheme proposed by Alfaro and Gomes (2001), to quantify the effect of the soil moisture and clay fraction in the emissions. For this purpose, an extensive data set of Soil Moisture and Ocean Salinity soil moisture, European Centre for Medium‐Range Weather Forecasting wind speed at 10 m height, Food Agricultural Organization soil texture maps, MODIS (Moderate Resolution Imaging Spectroradiometer) Normalized Difference Vegetation Index, and erodibility of the soil surface were collected for the a period of 3 years, from 2010 to 2013. Though the considered data sets have different temporal and spatial resolution, efforts have been made to make them consistent in time and space. At first, the simulated sandblasting flux over the region were validated qualitatively using MODIS Deep Blue aerosol optical depth and EUMETSAT MSG (Meteosat Seciond Generation) dust product from SEVIRI (Meteosat Spinning Enhanced Visible and Infrared Imager) and quantitatively based on the available ground‐based measurements of near‐surface particulate mass concentrations (PM10) collected over four stations in the MENA region. Sensitivity analyses were performed to investigate the effect of soil moisture and clay fraction on the emissions flux. The results showed that soil moisture and soil texture have significant roles in the dust emissions over the MENA region, particularly over the Arabian Peninsula. An inversely proportional dependency is observed between the soil moisture and the sandblasting flux, where a steep reduction in flux is observed at low friction velocity and a gradual reduction is observed at high friction velocity. Conversely, a directly proportional dependency is observed between the soil clay fraction and the sandblasting flux where a steep increase in flux is observed at low friction velocity and a gradual increase is observed at high friction velocity. The magnitude of the percentage reduction/increase in the sandblasting flux decreases with the increase of the friction velocity for both soil moisture and soil clay fraction. Furthermore, these variables are interdependent leading to a gradual decrease in the percentage increase in the sandblasting flux for higher soil moisture values.

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“…When no soil moisture data is available for some pixels during a month, the pixel is considered to be a plausible dust emitting surface regarding the soil moisture criterion. Kim and Choi (2015) have studied the correlation between measured dust AOD, wind speed and soil moisture. They have 10 shown that "the threshold soil moisture for dust outbreak increased with increasing wind speed", and that for a volumetric soil moisture higher than 16% the measured AODs are only barely affected by wind speed conditions, indicating that this value could be a general soil moisture threshold above which dust emissions are almost impossible.…”

Section: Soil Moisturementioning

confidence: 99%

African mineral dust sources: a combined analysis based on 3D dust aerosols distributions, winds and surface parameters

Vandenbussche

Mazière

2017

Preprint

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Abstract. Mineral dust aerosols are a key player in the climate system. Their emissions are not yet characterised enough to ensure their good representation in climate models. The work presented here aims at a better characterisation of dust sources by a new analysis method. We use the three-dimensional dust aerosols distribution from the Infrared Atmospheric Sounding Interferometer (IASI), obtained with the Mineral Aerosols Profiling from Infrared Radiances (MAPIR) algorithm. The availability of vertical information on top of total column information allows to better separate emissions from transport. However, the 5 presence of dust at the surface could also be due to low altitude transport, or to deposition processes. Therefore, to strengthen the analysis, we have completed it with an analysis of wind speed and surface state parameters (land cover, vegetation, moisture). For the more complex case of the Sahel, we have also analysed the soil type and the wind direction patterns. Our analysis highlights the well-known Saharan hot-spots, but also a less well-known significant emission place west of the Bodélé depression. The study of Sahel dust sources is a new feature for satellite-based analyses. Our results are coherent with those drawn 10 from local ground-based measurements, allowing to extend our analysis to the entire Sahel area with confidence. We also provide a morning versus evening comparison, helping to distinguish the different emission mechanisms in play, and a small year-to-year variation analysis.

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Impact of soil moisture on dust outbreaks in East Asia: Using satellite and assimilation data

Cited by 74 publications

References 42 publications

Dryland climate change: Recent progress and challenges

Dryland climate change: Recent progress and challenges

Dust emission parameterization scheme over the MENA region: Sensitivity analysis to soil moisture and soil texture

African mineral dust sources: a combined analysis based on 3D dust aerosols distributions, winds and surface parameters

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