Aerosol Deposition Impacts on Land and Ocean Carbon Cycles

Mahowald, N. M.; Scanza, Rachel A.; Brahney, Janice; Goodale, Christine L.; Hess, Peter; Moore, J. Keith; Neff, Jason C.

doi:10.1007/s40641-017-0056-z

Cited by 123 publications

(102 citation statements)

References 200 publications

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“…Mahowald et al (2017) indicated that during dust events, AOD can be used as a reliable tool to represent dust loading in the atmosphere. High AOD values were observed in Mongolia, Inner Mongolia, Hexi Corridor, the eastern Taklimakan Desert, and the Northwest China Plain (Fig.…”

Section: Trajectory Modelmentioning

confidence: 99%

“…We estimated that 0.9 Tg of dust was deposited over North America. Iron deposition over the North Pacific Ocean was estimated by ourselves to be 0.19 Tg, assuming the dust contained 3.5 % iron (Luo et al, 2005;Mahowald et al, 2017). Transport of dust emitted from East Asian desert sources is highly dependent on atmospheric circulation (Zhang et al, 1997).…”

Section: Atmospheric Dust Depositionmentioning

confidence: 99%

“…Trans-Pacific transport of mineral dust from East Asia to North America has been frequently detected during springtime (Merrill et al, 1989;Mahowald et al, 1999;Zhao et al, 2003;McKendry et al, 2008;Cottle et al, 2013a). Longrange transport of dust aerosol has been substantiated by ice core samples taken at the North Pole (Jaffe et al, 1999;Mahowald et al, 2017). In addition, oceanic chlorophyll observations have suggested a strong linkage between mineral dust and oceanic primary production after atmospheric dust deposition events (Young et al, 1991;Mahowald et al, 2009).…”

mentioning

confidence: 96%

“…Duce et al (1991) and Tagliabue et al (2017) also suggest a possible association between dust storms and enrichment of iron (Fe) and phosphorus (P) in oceans. Mineral dust aerosols are the primary source of Fe in the atmosphere (Mahowald et al, 2017). According to physically based model estimation, more than 60 Tg Fe and 1 Tg P are deposited into world oceans as a result of the fallout of atmospheric dust (Luo et al, 2005;Mahowald et al, 2017).…”

mentioning

confidence: 99%

“…Mineral dust aerosols are the primary source of Fe in the atmosphere (Mahowald et al, 2017). According to physically based model estimation, more than 60 Tg Fe and 1 Tg P are deposited into world oceans as a result of the fallout of atmospheric dust (Luo et al, 2005;Mahowald et al, 2017). However, uncertainties exist in assessing the global dust cycle due to a lack of understanding in parameterizing dust emission, transport, and deposition (Wang et al, 2000;Ginoux et al, 2001;Mahowald et al, 2003;Shao and Dong, 2006;Zhao et al, 2010;Huneeus et al, 2011;Kok, 2011).…”

mentioning

confidence: 99%

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East Asian dust storm in May 2017: observations, modelling, and its influence on the Asia-Pacific region

et al. 2018

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Abstract. A severe dust storm event originated from the Gobi Desert in Central and East Asia during 2–7 May 2017. Based on Moderate Resolution Imaging Spectroradiometer (MODIS) satellite products, hourly environmental monitoring measurements from Chinese cities and East Asian meteorological observation stations, and numerical simulations, we analysed the spatial and temporal characteristics of this dust event as well as its associated impact on the Asia-Pacific region. The maximum observed hourly PM10 (particulate matter with an aerodynamic diameter ≤ 10 µm) concentration was above 1000 µg m−3 in Beijing, Tianjin, Shijiazhuang, Baoding, and Langfang and above 2000 µg m−3 in Erdos, Hohhot, Baotou, and Alxa in northern China. This dust event affected over 8.35 million km2, or 87 % of the Chinese mainland, and significantly deteriorated air quality in 316 cities of the 367 cities examined across China. The maximum surface wind speed during the dust storm was 23–24 m s−1 in the Mongolian Gobi Desert and 20–22 m s−1 in central Inner Mongolia, indicating the potential source regions of this dust event. Lidar-derived vertical dust profiles in Beijing, Seoul, and Tokyo indicated dust aerosols were uplifted to an altitude of 1.5–3.5 km, whereas simulations by the Weather Research and Forecasting with Chemistry (WRF-Chem) model indicated 20.4 and 5.3 Tg of aeolian dust being deposited respectively across continental Asia and the North Pacific Ocean. According to forward trajectory analysis by the FLEXible PARTicle dispersion (FLEXPART) model, the East Asian dust plume moved across the North Pacific within a week. Dust concentrations decreased from the East Asian continent across the Pacific Ocean from a magnitude of 103 to 10−5 µg m−3, while dust deposition intensity ranged from 104 to 10−1 mg m−2. This dust event was unusual due to its impact on continental China, the Korean Peninsula, Japan, and the North Pacific Ocean. Asian dust storms such as those observed in early May 2017 may lead to wider climate forcing on a global scale.

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Section: Trajectory Modelmentioning

confidence: 99%

Section: Atmospheric Dust Depositionmentioning

confidence: 99%

mentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

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East Asian dust storm in May 2017: observations, modelling, and its influence on the Asia-Pacific region

et al. 2018

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Patterns and Processes in Aerosol Bulk Deposition: Insights from a 9-year Study of 7Be, 210Pb, Sulfate and Major/Trace Elements

Landis

Feng

Kaste

et al. 2021

Preprint

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We report fallout radionuclide (FRN) and major/trace element (MTE) contributions to bulk atmospheric deposition in Hanover, NH USA (43.7022°N, 72.2896°W). Deposition of 7 Be, 210 Pb and SO 4 covary [R 2 >0.4, n=461] but are discriminated by production sources, depositional mechanisms, meteorological controls, MTE associations, and seasonal biases. 7 Be is dominated by rainout (78% of total deposition), recharged by long-range transport (+23% over mean, o.m.), influenced by stratospheretroposphere-exchange (+9% o.m.) and solar activity (-2% per doubling of sunspot count). Correlation with particulate nitrogen (+9% per doubling of N) indicates 7 Be affinity for biogenic aerosols. 210 Pb is dominated by dry+washout deposition (54% of total) and convective storms (+107% o.m), is depleted in marine moisture sources (-133% o.m.), correlated with S (+9% per doubling of S) and biased to autumn with Mn, Hg, and V (+7% o.m.). Coincident long-term declines in S and 210 Pb (-14%, -4% per year) suggest co-scavenging by PbSO 4 . 7 Be: 210 Pb ratios increase asymptotically with precipitation through the dry-washoutrainout transition and recharge of 7 Be. At the global scale, 7 Be: 210 Pb increases with precipitation for North American/European sites due to recharge of 7 Be in mid-latitude storm belts [R 2 =0.64, n=31]. Conversely, 7 Be: 210 Pb is independent of precipitation for Southeast/East Asian sites where 7 Be recharge is low [R 2 =0.01, n=40]. Globally, 7 Be: 210 Pb ratios in dry deposition reflect resuspended aerosols with mean age of ca. 200 days, contributing <5% of 210 Pb deposition. Different aerosol populations contributing to FRN deposition across spatial and temporal scales should emerge as a focus in terrestrial 7 Be, 210 Pb and 10 Be tracer applications.

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Spatiotemporal evolution of aeolian dust in China: An insight into the synoptic records of 1984–2020 and nationwide practices to combat desertification

Zhang

Lei

et al. 2023

Land Degrad Dev

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Aeolian dust is closely related to land degradation, desertification, and sand and dust storm weather, and is a significant factor influencing the Earth's biogeochemical cycles. Here we present an investigation of the recent synoptic features of atmospheric dust in China and analyze its spatiotemporal change based upon meteorological observation data and satellite products. It shows that aeolian dust frequency in China has decreased gradually from 1984 to 2020. The outbreak frequency of dust storms declined significantly by 97.7%, followed by severe dust storm, dust in suspension, and blowing dust with 88.8%, 75%, and 64.3% reduction, respectively. The main dust sources influencing China are the Mongolian Gobi Desert, the Taklimakan Desert, the Hexi Corridor, the Alxa Plateau Desert, the Qaidam basin Desert, and the northeast‐southwest stretching semiarid farming‐pasture ecotone. Atlantic multidecadal oscillation (AMO) and Pacific decadal oscillation (PDO) may play an important role in teleconnection with aeolian dust event occurrence in China. Their correlation coefficients are −0.6 and 0.37, respectively. For more than 40 years, China has made huge investments in ecological restoration projects, and enacted national policies and laws to mitigate desertification. Significant environmental improvement has consequently ensued in China in the early 21st century, and the aeolian dust events were reduced to a record minimum in 2020. In contrast to the growing nationwide greenness, China is now facing up to an incremental dust risk generated from extraterritorial source regions such as the Mongolian Gobi Desert and Central Asian desiccated salt lakes.

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Aerosol Deposition Impacts on Land and Ocean Carbon Cycles

Cited by 123 publications

References 200 publications

East Asian dust storm in May 2017: observations, modelling, and its influence on the Asia-Pacific region

East Asian dust storm in May 2017: observations, modelling, and its influence on the Asia-Pacific region

Patterns and Processes in Aerosol Bulk Deposition: Insights from a 9-year Study of 7Be, 210Pb, Sulfate and Major/Trace Elements

Spatiotemporal evolution of aeolian dust in China: An insight into the synoptic records of 1984–2020 and nationwide practices to combat desertification

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