Article
Environmental Sciences
Y. AboEl-Fetouh, N. T. O'Neill, J. K. Kodros, J. R. Pierce, H. Lu, K. Ranjbar, P. Xian
Summary: The GEOS-Chem TOMAS (GCT) simulations of AERONET-inversion products during 2015 were compared with AERONET-inversion products from the multi-year climatology of AboEl-Fetouh et al. (2020). The study found that while GCT captured the springtime coarse mode (CM) peak and the late summer/fall increase in amplitude of that peak, it did not capture the spring to summer radius increase of the fine mode (FM) peak. The lack of capturing the FM radius increase was attributed to the large GCT cell size and difficulties in modeling coagulation-induced smoke particle size. The large deviations between GCT and AERONET retrievals were attributed to an extreme forest fire event in July 2015.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Claire E. Simpson, Christopher D. Arp, Yongwei Sheng, Mark L. Carroll, Benjamin M. Jones, Laurence C. Smith
Summary: Research focused on Pleistocene sand sea lakes in the Arctic Coastal Plain of northern Alaska was conducted to collect in situ bathymetric data for testing 12 model variants for predicting lake depth. Using Landsat-8 Operational Land Imager (OLI) images, lake depth gradients were measured to select and calibrate the most accurate spectral-depth models for each study lake. Integration of bathymetric data with remotely sensed lake surface area allowed for quantification of lake water storage volumes and highlighted the need for additional in situ data to develop a regional model solution.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Environmental Sciences
K. M. Markowicz, J. Lisok, P. Xian
Summary: This study presents the climatology of aerosol optical properties and radiative forcing over the Arctic, showing different contributions of various aerosol types to aerosol optical depth and their impact on radiative forcing. Cloud cover reduces surface cooling effect and shifts the radiative forcing towards positive values.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Fenix Garcia-Tigreros, Clayton D. Elder, Martin R. Kurek, Benjamin L. Miller, Xiaomei Xu, Kimberly P. Wickland, Claudia Czimczik, Mark M. Dornblaser, Robert G. Striegl, Ethan D. Kyzivat, Laurence C. Smith, Robert G. M. Spencer, Charles E. Miller, David E. Butman
Summary: Northern high-latitude lakes are important for carbon processing and emission of permafrost-derived carbon. The fate and emission pathways of permafrost carbon in these lakes remain uncertain. This study used radiocarbon dating to identify the sources of carbon in nine lakes in Alaska and found that permafrost-derived carbon contributes to the dissolved carbon in some lakes, but the overall transport of permafrost carbon in the lakes is small.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Hujia Zhao, Ke Gui, Yanjun Ma, Yangfeng Wang, Yaqiang Wang, Hong Wang, Yu Zheng, Lei Li, Lei Zhang, Huizheng Che, Xiaoye Zhang
Summary: In this study, the seasonal evolution and vertical distribution of aerosol loading in northeastern China were analyzed using satellite observations and reanalysis data. The results showed that aerosol optical depth was higher in spring and summer, particularly for sulfate and organic matter species. The aerosol extinction coefficient exhibited different distributions at different seasons and heights. Overall, there was a decreasing trend in aerosol optical depth in northeastern China.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
M. Ashok Williams, K. Nirmal Raj, A. Naga Rajesh, T. V. Lakshmi Kumar, D. Narayana Rao
Summary: Sea breeze onset studies are crucial for understanding the impact of local air pollution and the environment. This study focuses on the sea breeze onset time in a semi-urban area on the tropical east coast of India. The results indicate a decrease in black carbon mass concentration and an increase in aerosol optical depth after the sea breeze onset.
PURE AND APPLIED GEOPHYSICS
(2022)
Article
Environmental Sciences
Anne Gadeke, Christopher D. Arp, Anna K. Liljedahl, Ronald P. Daanen, Lei Cai, Vladimir A. Alexeev, Benjamin M. Jones, Mark S. Wipfli, Jorg Schulla
Summary: This study analyzed the hydrological processes in the Arctic Coastal Plain and found that extreme climate events and lake water withdrawal have significant impacts on watershed hydrology. The results showed that drought scenarios had a greater reduction in streamflow than water withdrawal alone, and long-term water withdrawal resulted in a new equilibrium in low flow and seasonal runoff. The study highlights the importance of considering the combined effects of climate change and industrial water withdrawals in land management.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Hongke Cai, Ke Gui, Wanting Jiang, Yaqin Mao, Yue Yang, Zuosen Zhao
Summary: This study investigates the climatology and interannual variability of aerosol loading and properties in southwestern China and northern India based on satellite observations and reanalysis data. The results show that high aerosol optical depth is mainly observed in the Sichuan Basin and northern India, dominated by anthropogenic aerosols and mineral dust aerosols respectively. The lower troposphere contributes significantly to aerosol loading, and the Tibetan Plateau has relatively lower aerosol optical depth.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Engineering, Environmental
Arthur J. Sedlacek III, Ernie R. Lewis, Timothy B. Onasch, Paquita Zuidema, Jens Redemann, Daniel Jaffe, Lawrence I. Kleinman
Summary: The lifecycle of black carbon (BC)-containing particles from biomass burns is primarily influenced by changes in particle coating, with the coating mass increasing rapidly, then remaining relatively constant for a period before slowly decreasing. The initial increase in coating mass can be used to determine the formation rates of secondary organic aerosol (SOA).
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Limnology
Anders Frugard Opdal, Tom Andersen, Dag O. Hessen, Christian Lindemann, Dag L. Aksnes
Summary: The forest cover in Northern Europe has been increasing over the past 120 years, resulting in more vegetation and carbon fixation. This leads to higher export of degraded plant-litter to surface waters, causing freshwater browning. The connection between freshwater browning and coastal water darkening is not well understood, but this study shows that forests in Northern Europe can influence coastal water clarity across thousands of kilometers.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Environmental Sciences
Ke Gui, Huizheng Che, Yu Zheng, Yaqiang Wang, Lei Zhang, Hujia Zhao, Lei Li, Junting Zhong, Wenrui Yao, Xiaoye Zhang
Summary: This study utilized a long-term dataset to analyze the global climatology of seasonal AODs, with results showing different types and sizes of aerosols contribute differently to the global aerosol impact. The study also found significant declines in seasonal TAOD in most regions globally, with small-size AOD and spherical AOD contributing most significantly to the decrease.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yongjing Ma, Yongli Tian, Yuanzhe Ren, Zifa Wang, Lin Wu, Xiaole Pan, Yining Ma, Jinyuan Xin
Summary: This study analyzed aerosol optical depth (AOD) measurements from 2017 to 2020 in urban Hohhot, a transitional zone between a depopulated area and an East Asian urban agglomeration in the Mongolian plateau. The results indicate that Hohhot experiences a slightly polluted level of aerosols, mainly consisting of a mixture of coarse dust aerosols and fine urban/industrial aerosols. The air flows in Hohhot are predominantly influenced by continental air from the depopulated zone, with additional contributions from southern and western air masses carrying urban/industrial aerosols.
Article
Environmental Sciences
Shantikumar S. Ningombam, Pradeep Khatri, E. J. L. Larson, Umesh Chandra Dumka, Chandan Sarangi, R. Vineeth
Summary: Biomass burning releases a large amount of pollutants and aerosols, impacting regional and global climate as well as air quality and human health. This study investigated the temporal and spatial distributions of biomass burning and its contribution to aerosol optical and radiative impacts in six major regions across the globe. The findings revealed that the highest fire counts occurred during the active burning phase, followed by the post and pre burning phases. The active and post fire regimes were characterized by high levels of absorption aerosol optical depth and the presence of mixed aerosols.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Yi Wang, Jun Wang, Robert C. Levy, Yingxi R. Shi, Shana Mattoo, Jeffrey S. Reid
Summary: By developing the CW-1km algorithm, spatial continuity of Aerosol Optical Depth (AOD) between land, coast, and open ocean is improved, and the availability of AOD product is increased by 47.0%. Compared with 15 years of marine aerosol network measurements, CW-1km AODs are validated to have a normalized mean bias of 1.0%, much smaller than the 17.6% for the original DT product.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Tingting Liao, Ke Gui, Yingfang Li, Xinying Wang, Yang Sun
Summary: Different types of aerosols in Southwest China exhibit distinct vertical distributions and seasonal variations, largely influenced by human emissions and biomass burning. Polluted continental/smoke and polluted dust are major aerosol sources, but have shown a decline since 2013, likely due to stricter regulations on industry emissions and biomass burning. This study provides important insights into the regional aerosol characteristics and their evolution over time, contributing to a better understanding of trans-regional aerosol transport and climate effects in the region.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
A. L. Gill, R. M. Grinder, C. R. See, F. S. Chapin, L. C. DeLancey, M. C. Fisk, P. M. Groffman, T. Harms, S. E. Hobbie, J. D. Knoepp, J. M. H. Knops, M. Mack, P. B. Reich, A. D. Keiser
Summary: Autotrophic and heterotrophic organisms require stoichiometrically balanced ratios of C to nutrients, and the availability of soil C influences the competition between autotrophic nitrifiers and heterotrophic decomposers for ammonium, affecting N mineralization and nitrification dynamics. This study used data from the LTER network to examine the impact of soil C concentration on the relationship between net nitrification and net N mineralization. The results showed that soil C availability constrains the fraction of mineralized N that undergoes nitrification, leading to decreased nitrification rates in high C concentration soils.
Article
Green & Sustainable Science & Technology
Brian Walker, Anne-Sophie Crepin, Magnus Nystrom, John M. M. Anderies, Erik Andersson, Thomas Elmqvist, Cibele Queiroz, Scott Barrett, Elena Bennett, Juan Camilo Cardenas, Stephen R. R. Carpenter, F. Stuart Chapin III, Aart de Zeeuw, Joern Fischer, Carl Folke, Simon Levin, Karine Nyborg, Stephen Polasky, Kathleen Segerson, Karen C. C. Seto, Marten Scheffer, Jason F. F. Shogren, Alessandro Tavoni, Jeroen van den Bergh, Elke U. U. Weber, Jeffrey R. R. Vincent
Summary: Financial advisers suggest diversifying investment portfolios to adapt to market fluctuations, and similarly, nature has diversified species to maintain ecosystem function. However, in areas such as urban planning, public health, transportation, and food production, this diversity seems overlooked. As we enter a period of unprecedented turbulence, it is important to actively design and manage response diversity. This Perspective discusses what response diversity is, how it can be expressed, enhanced, and lost, and emphasizes the need to strengthen diverse options for responding to disruptions.
NATURE SUSTAINABILITY
(2023)
Article
Environmental Sciences
Shawnee A. Kasanke, Donald A. Walker, F. Stuart Chapin, Daniel H. Mann
Summary: Widespread glacial retreat in arctic mountain ranges creates new habitats for flora and fauna that are threatened by rapid warming. A study in the Brooks Range shows that primary succession after deglaciation involves small communities of plant species, with low species turnover and persistent pioneer taxa such as lichens. Succession is slow but directional, leading to increased species richness and vegetation cover over thousands of years.
ARCTIC ANTARCTIC AND ALPINE RESEARCH
(2023)
Article
Forestry
Melinda T. T. Berman, Xinxin Ye, Laura H. H. Thapa, David A. A. Peterson, Edward J. J. Hyer, Amber J. J. Soja, Emily M. M. Gargulinski, Ivan Csiszar, Christopher C. C. Schmidt, Pablo E. E. Saide
Summary: In this study, a novel algorithm is developed to estimate hourly accumulated burned area using non-convex polygons containing VIIRS active-fire detections. Hourly time series are created by combining VIIRS estimates with FRP estimates from GOES-17 data. The results show that the hourly accumulation of burned area for multiple fires from 2019 to 2020 generally correlate strongly with airborne IR observations, exhibiting correlation coefficient values usually greater than 0.95 and errors <20%.
INTERNATIONAL JOURNAL OF WILDLAND FIRE
(2023)
Correction
Environmental Sciences
Yang Ou, Lei Li, Zhengqiang Li, Ying Zhang, Oleg Dubovik, Yevgeny Derimian, Cheng Chen, David Fuertes, Yisong Xie, Anton Lopatin, Fabrice Ducos, Zongren Peng
Article
Meteorology & Atmospheric Sciences
Francis A. Turney, Pablo E. Saide, Pedro A. Jimenez Munoz, Domingo Munoz-Esparza, Edward J. Hyer, David A. Peterson, Maria E. Frediani, Timothy W. Juliano, Amy L. DeCastro, Branko Kosovic, Xinxin Ye, Laura H. Thapa
Summary: Predicting the evolution of wildfires, including burned area, smoke emissions, and energy release, is crucial for air quality forecasting and emergency response planning. This study compares a coupled fire-weather model with current methods used in air quality forecasts. The results show that incorporating containment efforts in the model has the greatest impact on accurate predictions of daily burned area.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Theano Drosoglou, Ioannis-Panagiotis Raptis, Massimo Valeri, Stefano Casadio, Francesca Barnaba, Marcos Herreras-Giralda, Anton Lopatin, Oleg Dubovik, Gabriele Brizzi, Fabrizio Niro, Monica Campanelli, Stelios Kazadzis
Summary: This study aims to evaluate the effect of NO2 absorption on the columnar properties of aerosols, including aerosol optical depth (AOD), Angstrom exponent (AE), and single scattering albedo (SSA). The researchers utilized multiannual records of AOD, AE, and SSA collected from sun photometers in the Rome area. They investigated the uncertainties introduced in aerosol retrievals by NO2 absorption using co-located spectroradiometer systems and satellite-based NO2 products. The results showed that the standard network products overestimated AOD and AE, and the correction for NO2 was more effective in areas with high NO2 pollution events.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Geochemistry & Geophysics
Meng Zhou, Jun Wang, Lorena Castro Garcia, Xi Chen, Arlindo M. da Silva, Zhuosen Wang, Miguel O. Roman, Edward J. Hyer, Steven D. Miller
Summary: We introduce the second-generation Fire Light Detection Algorithm (FILDA-2), which improves fire detection and retrieval of radiative power (FRP), fire visible energy fraction (VEF), and fire modified combustion efficiency (MCE) using multiple-spectral radiances measured by VIIRS. FILDA-2 can detect smaller and cooler fires than the operational VIIRS algorithm and provides daily global pixel-level characterizations of MCE for nighttime surface fires.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Meteorology & Atmospheric Sciences
Hyungwon John Park, Jeffrey S. S. Reid, Livia S. S. Freire, Christopher Jackson, David H. H. Richter
Summary: The representation of in situ measurements of sea spray or dust particles is a likely contributor to the unrealistic range of flux and concentration outcomes in the literature. This paper conducts high-resolution large eddy simulations to better understand the temporal evolution and volumetric variability of coarse-to-giant-mode marine aerosol particles and their relationship to turbulent transport. The results show that turbulent flux sampling is influenced by spatial length scales, sampling methods, and atmospheric stability.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)
Article
Meteorology & Atmospheric Sciences
Milagros E. Herrera, Oleg Dubovik, Benjamin Torres, Tatyana Lapyonok, David Fuertes, Anton Lopatin, Pavel Litvinov, Cheng Chen, Jose Antonio Benavent-Oltra, Juan L. Bali, Pablo R. Ristori
Summary: Understanding uncertainties in aerosol and surface property retrievals is crucial for characterizing atmospheric processes accurately. Despite challenges in characterizing error budgets, dynamic error estimates are essential for remote sensing approaches. The GRASP algorithm provides dynamic error estimates for retrieved aerosol and surface properties, considering both random and systematic uncertainties, aiding in optimizing observation schemes and retrieval set-ups.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)
Article
Environmental Sciences
Eva-Lou Edwards, Jeffrey S. Reid, Peng Xian, Sharon P. Burton, Anthony L. Cook, Ewan C. Crosbie, Marta A. Fenn, Richard A. Ferrare, Sean W. Freeman, John W. Hair, David B. Harper, Chris A. Hostetler, Claire E. Robinson, Amy Jo Scarino, Michael A. Shook, G. Alexander Sokolowsky, Susan C. van den Heever, Edward L. Winstead, Sarah Woods, Luke D. Ziemba, Armin Sorooshian
Summary: Monitoring and modeling aerosol particle life cycle in Southeast Asia faces challenges due to cloud cover, meteorology, and diverse aerosol species. This study evaluates the accuracy of an aerosol model in providing crucial information for the region through comparisons with airborne aerosol and meteorological measurements. The results show good agreement between the modeled and retrieved aerosol properties, despite the challenging environment and limited satellite observations.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Alireza Moallemi, Rob L. Modini, Tatyana Lapyonok, Anton Lopatin, David Fuertes, Oleg Dubovik, Philippe Giaccari, Martin Gysel-Beer
Summary: Polar nephelometers are useful instruments for measuring light scattered by aerosol particles, providing important information about aerosol properties. Using Bayesian information content analysis, it has been found that even basic polar nephelometers can provide informative measurements, and adding multiwavelength and/or polarimetric measurement capabilities increases the information content. Truncation at extreme angles can decrease the information content, but more comprehensive measurements can mitigate this effect. The number and placement of angular measurements also have an impact on the information content.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)
Article
Environmental Sciences
Thomas Druge, Pierre Nabat, Marc Mallet, Martine Michou, Samuel Remy, Oleg Dubovik
Summary: This study implements BrC aerosols in a climate model and analyzes their radiative and climatic effects. The results show that the inclusion of BrC improves the estimation of aerosol optical properties and has a positive impact on the climate in Africa and South America.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Peng Xian, Jianglong Zhang, Norm T. O'Neill, Jeffrey S. Reid, Travis D. Toth, Blake Sorenson, Edward J. Hyer, James R. Campbell, Keyvan Ranjbar
Summary: In this study, the climatology and trend of Arctic aerosol optical depth (AOD) for the spring and summer periods from 2003 to 2019 were analyzed, and the statistics and trends of extreme AOD events in the Arctic were reported. Extreme events were mainly dominated by fine-mode aerosol particles, with biomass burning (BB) smoke events being the main cause in the North American Arctic, the Asian Arctic, and most areas of the Arctic Ocean.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Alexander Sinyuk, Brent N. Holben, Thomas F. Eck, David M. Giles, Ilya Slutsker, Oleg Dubovik, Joel S. Schafer, Alexander Smirnov, Mikhail Sorokin
Summary: This paper discusses the history and modification of the smoothness constraints on the imaginary part of the refractive index in the AERONET retrieval algorithm to adapt to different types of aerosol absorption characteristics. The new version of the smoothness constraints significantly reduced the retrieved single-scattering albedo and spectral residual errors for brown-carbon-containing aerosols, especially at short wavelengths.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)