Record-breaking dust loading during two mega dust storm events over northern China in March 2021: aerosol optical and radiative properties and meteorological drivers

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(12), P. 7905 - 7932

Published: June 17, 2022

Abstract. Although a remarkable reduction in the frequency of sand and dust storms (SDSs) past several decades has been reported over northern China (NC), two unexpected mega SDSs occurred on 15–20 27–29 March 2021 (abbreviated as “3.15” “3.27” SDS events), which reawakened widespread concern. This study characterizes optical, microphysical, radiative properties aerosols their meteorological drivers during these events using Sun photometer observations Beijing comprehensive set multiple satellite (including MODIS, VIIRS, CALIOP, Himawari-8) ground-based CMA visibility network AD-Net) combined with atmospheric reanalysis data. Moreover, long-term (2000–2021) optical depth (DOD) dataset retrieved from MODIS measurements was also utilized to evaluate historical ranking loading NC events. During 3.15 3.27 events, invasion plumes greatly degraded large areas NC, extreme low 50 500 m recorded at most sites 15 28 March, respectively. Despite shorter duration event relative event, sun larger peak AOD (∼2.5) former than latter (∼2.0), mainly attributed short-term intrusion coarse-mode particles effective radii (∼1.9 µm) volume concentrations (∼2.0 µm3 µm−2) event. The shortwave direct aerosol forcing induced by estimated be −92.1 −111.4 W m−2 top atmosphere, −184.7 −296.2 surface, +92.6 +184.8 atmosphere CALIOP show that plume lifted an altitude 4–8 km, its range impact extended source eastern coast China. In contrast, lifting height lower confirmed lidar observations. MODIS-retrieved DOD data registered massive intense episode same period history 2 decades. These were associated both circulation extremes local anomalies favored enhanced emissions Gobi Desert (GD) across southern Mongolia NC. Meteorological analysis revealed triggered exceptionally strong Mongolian cyclone generated nearly location (along central plateau Inner Mongolia) conjunction surface-level cold high-pressure system rear, albeit differences magnitude spatial extent impact. GD, early melting spring snow caused near-surface temperature regions, together negative soil moisture decreased precipitation, formed drier barer surfaces, allowed for increased into strongly surface winds cyclone.

Language: Английский

---

Mega Asian dust event over China on 27–31 March 2021 observed with space-borne instruments and ground-based polarization lidar

Atmospheric Environment, Journal Year: 2022, Volume and Issue: 285, P. 119238 - 119238

Published: June 16, 2022

Language: Английский

---

Aerosol optical and radiative properties and their environmental effects in China: A review

Earth-Science Reviews, Journal Year: 2023, Volume and Issue: 248, P. 104634 - 104634

Published: Nov. 26, 2023

Language: Английский

---

Dust and climate interactions in the Middle East: Spatio-temporal analysis of aerosol optical depth and climatic variables

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 172176 - 172176

Published: April 2, 2024

The Middle East (ME) is grappling with an alarming increase in dust levels, measured as aerosol optical depth (AOD), which poses significant threats to air quality, human health, and ecological stability. This study aimed investigate correlations between climate non-climate driving factors AOD the ME over last four-decade (1980–2020), based on analysis of three variables: actual evapotranspiration (AET), potential (PET), precipitation (P). A comprehensive conducted discern patterns trends, a particular focus regions such Rub al-Khali, Ad-Dahna, An-Nafud Desert, southern Iraq, where consistently high levels were observed. 77 % area classified arid or semi-arid aridity index. Our results indicate upward trend Iran, Yemen, Saudi Arabia. We noted increasing AET Euphrates Tigris basin, northern-Iran, Nile region, along rising PET zones Syria. Conversely, P showed notable decrease northern-Iraq, Syria, southwestern southern-Turkey. Comparison long-term changes (10-year moving averages) consistent decreasing all regions. Utilizing Budyko space-based analysis, we found that climatic mainly influence much East, while non-climatic have strong impact certain areas like Tigris-basin, northern-Iran. experiences complex intricate interactions events their drivers. To address this issue, multi-system approach necessary, considers both Moreover, efficient control strategy should include soil water conservation, advanced monitoring, public awareness campaigns involve regional international collaboration.

Language: Английский

---

Retrieval of total and fine mode aerosol optical depth by an improved MODIS Dark Target algorithm

Environment International, Journal Year: 2022, Volume and Issue: 166, P. 107343 - 107343

Published: June 11, 2022

Total and fine mode aerosol optical depth (AODT AODF), as well the fraction (FMF = AODF/AODT), are critical variables for climate change atmospheric environment studies. The retrievals with high accuracy from satellite observations, particularly FMF AODF over land, remain challenging. This study aims to improve Moderate-resolution Imaging Spectro-radiometer (MODIS) land dark target (DT) algorithm retrieving AODT, AODF, on a global scale. Based fact that underestimated surface reflectance (SR) could overestimate AODT underestimate size parameter in DT algorithm, two robust schemes were developed SR determination: first (NEW1 DT) used top of atmosphere instead at 2.12 µm; second (NEW2 eleven-year MODIS data establish monthly spectral relationship model (2.12-0.47 2.12-0.65 µm) database pixel-by-pixel Then novel lookup table approach based physical process was proposed retrieve FMF. new FMF, compared AERosol RObotic NETwork (AERONET) retrievals. Results showed root mean square error (RMSE) 0.096-0.103, 0.098-0.099, 0.167-0.180 AODTs, AODFs, FMFs, respectively, which better than Collection 6.1 (C6.1) (0.117, 0.235, 0.426) validation by AERONET sites. From results, NEW2 provided coarse AOD retrievals, while NEW1 had performances. spatial patterns AODC algorithms comparable those Polarization Directionality Earth's Reflectances product. Hence, have potential provide products scientific community using long-term data.

Language: Английский

---

Climatology of aerosol component concentrations derived from multi-angular polarimetric POLDER-3 observations using GRASP algorithm

Earth system science data, Journal Year: 2022, Volume and Issue: 14(7), P. 3439 - 3469

Published: July 29, 2022

Abstract. The study presents a climatology of aerosol composition concentrations obtained by recently developed algorithm approach, namely the Generalized Retrieval Atmosphere and Surface Properties (GRASP)/Component. It is applied to whole archive observations from POLarization Directionality Earth's Reflectances (POLDER-3). conceptual specifics GRASP/Component approach in direct retrieval speciation (component fraction) without intermediate retrievals optical characteristics. Although global validation derived component product challenging, results are line with general knowledge about types different regions. In addition, we compare GRASP-derived black carbon (BC) dust components those Modern-Era Retrospective Analysis for Research Applications, version 2 (MERRA-2) product. Quite reasonable agreement was found between spatial temporal distribution species provided GRASP MERRA-2. differences, however, appeared regions known strong biomass burning emissions; reasons discrepancies discussed. other components, such as absorbing (BC, brown (BrC), iron-oxide content mineral dust) scattering (ammonium sulfate nitrate, organic carbon, non-absorbing aerosols, represent scarce but imperative information potential adjustment chemical transport models. properties (e.g., depth (AOD), Ångström exponent (AE), single-scattering albedo (SSA), fine- coarse-mode (AODF AND AODC)) were agree well Aerosol Robotic Network (AERONET) ground reference data, fully consistent previous Optimized, High Precision (HP) Models versions POLDER-3 data. Thus, presented extensive provides an opportunity understanding variabilities trends regional distributions species. addition additional valuable, qualitatively new insight and, therefore, demonstrates advantages multi-angular polarimetric (MAP) satellite next frontier inversion advanced observations. satellite-based dataset expected be useful improving emissions component-resolved radiative forcing estimations. products publicly available (https://www.grasp-open.com/products/, last access: 15 March 2022) used current registered under https://doi.org/10.5281/zenodo.6395384 (Li et al., 2022b).

Language: Английский

---

Effects of emission reductions on major anthropogenic aerosol-radiation-cloud interactions in East Asia in winter during 2007–2020

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 327, P. 120499 - 120499

Published: April 8, 2024

Language: Английский

---

Factors affecting precipitation formation and precipitation susceptibility of marine stratocumulus with variable above- and below-cloud aerosol concentrations over the Southeast Atlantic

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(4), P. 2769 - 2793

Published: March 2, 2022

Abstract. Aerosol–cloud–precipitation interactions (ACIs) provide the greatest source of uncertainties in predicting changes Earth's energy budget due to poor representation marine stratocumulus and associated ACIs climate models. Using situ data from 329 cloud profiles across 24 research flights NASA ObseRvations Aerosols above CLouds their intEractionS (ORACLES) field campaign September 2016, August 2017, October 2018, it is shown that contact between above-cloud biomass burning aerosols over Southeast Atlantic Ocean was with precipitation suppression a decrease susceptibility (So) aerosols. The 173 “contact” aerosol concentration (Na) greater than 500 cm−3 within 100 m tops had 50 % lower rate (Rp) 20 So, on average, compared 156 “separated” Na less up at least tops. Contact separated statistically significant differences droplet (Nc) effective radius (Re) (95 confidence intervals two-sample t test are reported). 84 90 higher Nc 1.4 1.6 µm Re profiles. In clean boundary layers (below-cloud 350 cm−3), 25 31 0.2 0.5 Re. polluted exceeding 98 108 1.8 On other hand, insignificant average liquid water path, thickness, meteorological parameters like surface temperature, tropospheric stability, estimated inversion strength. These results suggest microphysical properties were driven by rather effects, adjustments existing relationships Rp model parameterizations should be considered account for role ACIs.

Language: Английский

---

Spatio-temporal changes of spring-summer dust AOD over the Eastern Mediterranean and the Middle East: Reversal of dust trends and associated meteorological effects

Atmospheric Research, Journal Year: 2022, Volume and Issue: 281, P. 106509 - 106509

Published: Nov. 11, 2022

Language: Английский

---

Analysis of Long‐Term Trends in the Vertical Distribution and Transport Paths of Atmospheric Aerosols in Typical Regions of China Using 15 Years of CALIOP Data

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(14)

Published: July 1, 2023

Abstract Long‐range transport and vertical distribution of aerosols are important factors for assessing the uncertainty in aerosol radiative forcing. This paper reveals trends optical properties China using 15 years Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) data. The Hybrid Single‐Particle Lagrangian integrated trajectory model was used to analyze layer highest occurrence frequencies dust, polluted continental elevated smoke aerosols. results indicated that (a) there were significant regional seasonal differences depth (AOD) trend a given region depends on changes type frequency corresponding largest AOD profile. dust Beijing‐Tianjin‐Hebei (BTH) Central China. considerable decrease 0–2 km led column AOD. (b) main types also affected by sources long‐range pathways. In BTH, originated from Mongolian Plateau, accounting 57.88% total trajectories. Pearl River Delta dominated aerosols, trajectories mainly originating Myanmar Vietnam, 27.38% 29.59%, respectively. 15‐year backward Tibetan Plateau India is increasing.

Language: Английский

---