Monitoring and tracking the trans-Pacific transport of aerosols using  multi-satellite aerosol optical depth composites

Naeger, Aaron; Gupta, Pawan; Zavodsky, Bradley; McGrath, Kevin

doi:10.5194/amt-9-2463-2016

Cited by 14 publications

(10 citation statements)

References 54 publications

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“…4 and S8). AOD peaks in Europe in 2002, in ChinaSE in 2006 and 2014, (possibly related to changes in anthropogenic emissions; Sogacheva et al, 2018a, b). Relative AOD peaks over the Atlantic dust area in 1998, 2012 and 2015 (Peyridieu et al, 2013), and obvious AOD peaks in Indonesia related to the intensive forest fires in 1997, 2002, 2006(Chang et al, 2015Shi et al, 2019) are clearly seen.…”

Section: Aod Time Seriesmentioning

confidence: 99%

Merging regional and global aerosol optical depth records from major available satellite products

et al. 2020

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Abstract. Satellite instruments provide a vantage point for studying aerosol loading consistently over different regions of the world. However, the typical lifetime of a single satellite platform is on the order of 5–15 years; thus, for climate studies, the use of multiple satellite sensors should be considered. Discrepancies exist between aerosol optical depth (AOD) products due to differences in their information content, spatial and temporal sampling, calibration, cloud masking, and algorithmic assumptions. Users of satellite-based AOD time-series are confronted with the challenge of choosing an appropriate dataset for the intended application. In this study, 16 monthly AOD products obtained from different satellite sensors and with different algorithms were inter-compared and evaluated against Aerosol Robotic Network (AERONET) monthly AOD. Global and regional analyses indicate that products tend to agree qualitatively on the annual, seasonal and monthly timescales but may be offset in magnitude. Several approaches were then investigated to merge the AOD records from different satellites and create an optimised AOD dataset. With few exceptions, all merging approaches lead to similar results, indicating the robustness and stability of the merged AOD products. We introduce a gridded monthly AOD merged product for the period 1995–2017. We show that the quality of the merged product is as least as good as that of individual products. Optimal agreement of the AOD merged product with AERONET further demonstrates the advantage of merging multiple products. This merged dataset provides a long-term perspective on AOD changes over different regions of the world, and users are encouraged to use this dataset.

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Section: Aod Time Seriesmentioning

confidence: 99%

Merging regional and global aerosol optical depth records from major available satellite products

et al. 2020

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“…CC BY 4.0 License. Naeger et al (2016) combined daily AOD products from polar-orbiting and geostationary satellites to generate a near-realtime (NRT) daily AOD composite product for a case study of trans-Pacific transport of Asian pollution and dust aerosols in mid-March 2014. Li et al (2016a) constructed a monthly mean AOD ensemble by combining monthly AOD anomaly time series from five widely used satellite products (MODIS, MISR, SeaWiFS, OMI and POLDER) and applying an Ensemble Kalman Filter technique to these multi-sensor and ground-based aerosol observations to reduce uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Merging regional and global AOD records from 15 available satellite products

Sogacheva

Popp

Sayer

et al. 2019

Preprint

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Abstract. Satellite instruments provide a vantage point to study aerosol loading consistently over different regions of the world. However, the typical lifetime of a single satellite platform is on the order of 5&#8211;15 years; thus, for climate studies the usage of multiple satellite sensors should be considered. This paper assesses some options for creating merged products from an ensemble of 15 individual aerosol optical depth (AOD) data records produced from a broad range of institutions, sensors, and algorithms. Discrepancies exist between AOD products due to differences in their information content, spatial and temporal sampling, calibration, retrieval algorithm approach, as well as cloud masking and other algorithmic assumptions. Users of satellite-based regional AOD time-series are often confronted with the challenge of choosing the appropriate dataset for the intended application. In this study AOD products from different sensors and algorithms are discussed with respect to temporal and spatial differences. Several approaches are investigated to merge AOD records from different satellites, based on evaluation and inter-comparison results. Global and regional comparison of AOD monthly aggregates with ground-based AOD from the Aerosol Robotic Network (AERONET) indicates that different products agree qualitatively for major aerosol source regions on annual, seasonal and monthly time scales, but have regional offsets. All merged regional AOD time series show highly consistent temporal patterns illustrating the evolution of regional AOD. With few exceptions, all merging approaches lead to similar results, reassuring the usefulness and stability of the merged products. Here, we introduce a monthly AOD merged product for the period 1995&#8211;2017, which provides a long-term perspective on AOD changes over different regions of the world. We show that the quality of the merged product is as good as that of individual products. Optimal agreement of the AOD merged product with the AERONET further demonstrates the advantage of the merging of multiple products.

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“…In addition, the use of multiple satellite instruments, with different characteristics, is proposed to obtain more accurate information on the transport of aerosols and trace gases and their vertical distribution (e.g. Naeger et al, 2016). Recently, a technique has been demonstrated that makes it possible to derive CCN (cloud condensation nuclei) concentrations at cloud base using remote sensing of cloud properties (Rosenfeld et al, 2016).…”

Section: Main Pollutantsmentioning

confidence: 99%

Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region

et al. 2016

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Abstract. The northern Eurasian regions and Arctic Ocean will very likely undergo substantial changes during the next decades. The Arctic-boreal natural environments play a crucial role in the global climate via albedo change, carbon sources and sinks as well as atmospheric aerosol production from biogenic volatile organic compounds. Furthermore, it is expected that global trade activities, demographic movement, and use of natural resources will be increasing in the Arctic regions. There is a need for a novel research approach, which not only identifies and tackles the relevant multi-disciplinary research questions, but also is able to make a holistic system analysis of the expected feedbacks. In this paper, we introduce the research agenda of the Pan-Eurasian Experiment (PEEX), a multi-scale, multi-disciplinary and international program started in 2012 (https://www.atm.helsinki.fi/peex/). PEEX sets a research approach by which large-scale research topics are investigated from a system perspective and which aims to fill the key gaps in our understanding of the feedbacks and interactions between the land-atmosphereaquatic-society continuum in the northern Eurasian region. We introduce here the state of the art for the key topics in the PEEX research agenda and present the future prospects of the research, which we see relevant in this context.

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Monitoring and tracking the trans-Pacific transport of aerosols using multi-satellite aerosol optical depth composites

Cited by 14 publications

References 54 publications

Merging regional and global aerosol optical depth records from major available satellite products

Merging regional and global aerosol optical depth records from major available satellite products

Merging regional and global AOD records from 15 available satellite products

Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region

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