Zobrazeno 1 - 10
of 109
pro vyhledávání: '"Mark W, Shephard"'
Autor:
Mahmoudreza Momeni, Yunsoo Choi, Arash Kashfi Yeganeh, Arman Pouyaei, Jia Jung, Jincheol Park, Mark W. Shephard, Enrico Dammers, Karen E. Cady-Pereira
Publikováno v:
Environment International, Vol 184, Iss , Pp 108473- (2024)
Uncertainty in ammonia (NH3) emissions causes the inaccuracy of fine particulate matter simulations, which is associated with human health. To address this uncertainty, in this work, we employ the iterative finite difference mass balance (iFDMB) tech
Externí odkaz:
https://doaj.org/article/1c5cae86c9754f719445aed294652efd
Publikováno v:
Frontiers in Environmental Science, Vol 11 (2023)
Spatiotemporal monitoring of reactive nitrogen atmospheric deposition is essential for understanding its impact on sensitive ecosystems and quantifying cumulative effects. However, the sparsity of direct surface flux measurements combined with barrie
Externí odkaz:
https://doaj.org/article/59a4b43461414d1195bcb751547f8bab
Autor:
Evan White, Mark W. Shephard, Karen E. Cady-Pereira, Shailesh K. Kharol, Sean Ford, Enrico Dammers, Evan Chow, Nikolai Thiessen, David Tobin, Greg Quinn, Jason O’Brien, Jesse Bash
Publikováno v:
Remote Sensing, Vol 15, Iss 10, p 2610 (2023)
Presented is a methodology to explicitly identify and account for cloud-free satellite measurements below a sensor’s measurement detection level. These low signals can often be found in satellite observations of minor atmospheric species with weak
Externí odkaz:
https://doaj.org/article/df09cdc334034859abd8db40f3b9f7e9
Autor:
Changsub Shim, Jihyun Han, Daven K. Henze, Mark W. Shephard, Liye Zhu, Nankyoung Moon, Shailesh K. Kharol, Enrico Dammers, Karen Cady-Pereira
Publikováno v:
Atmosphere, Vol 13, Iss 8, p 1227 (2022)
We analyzed the multi-year relationship between particulate matter (PM10 and PM2.5) concentrations and possible precursors including NO2, SO2, and NH3 based on local observations over the Seoul Metropolitan Area (SMA) from 2015 to 2017. Surface NH3 c
Externí odkaz:
https://doaj.org/article/60cf5cc875eb4f81bd7db5693e8bd52b
Publikováno v:
Journal of Advances in Modeling Earth Systems, Vol 11, Iss 9, Pp 2934-2957 (2019)
Abstract Ammonia surface flux is bidirectional; that is, net flux can be either upward or downward. In fertilized agricultural croplands and grasslands there is usually more emission than deposition especially in midday during warmer seasons. In Nort
Externí odkaz:
https://doaj.org/article/c62788014b074c1591e034289443d112
Autor:
Christopher A Beale, Fabien Paulot, Cynthia A Randles, Rui Wang, Xuehui Guo, Lieven Clarisse, Martin Van Damme, Pierre-François Coheur, Cathy Clerbaux, Mark W Shephard, Enrico Dammers, Karen Cady-Pereira, Mark A Zondlo
Publikováno v:
Environmental Research Letters, Vol 17, Iss 10, p 104006 (2022)
Ammonia (NH _3 ) is a key precursor of haze particles and fine particulate matter (PM _2.5 ) and its spatiotemporal variabilities are poorly constrained. In this study, we present measurements of NH _3 over the Indian subcontinent region from the Inf
Externí odkaz:
https://doaj.org/article/6b1ec13229824c1dbd96704ac5cf7d11
The narrow cross section of cloud and aerosol properties retrieved by L2 algorithms that operate on data from EarthCARE's nadir-pointing sensors is broadened across-track by an algorithm that is described and demonstrated here. This scene constructio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77edbb9e708fff7b41c9cd7f8c5f57d3
https://amt.copernicus.org/articles/16/2319/2023/
https://amt.copernicus.org/articles/16/2319/2023/
Autor:
Karen Elena Cady-Pereira, Xuehui Guo, Rui Wang, April Leytem, Chase Calkins, Elizabeth Berry, Kang Sun, Markus Müller, Armin Wisthaler, Vivienne H. Payne, Mark W. Shephard, Mark A. Zondlo, Valentin H. Kantchev
Ammonia is a significant precursor of PM2.5 particles and thus contributes to poor air quality in many regions. Furthermore, ammonia concentrations are rising due to the increase of large scale, intensive agricultural activities, which are often acco
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffbef306f81464d9a868a7b5d248fb53
https://doi.org/10.5194/amt-2022-336
https://doi.org/10.5194/amt-2022-336
Autor:
Mahmoudreza Momeni, Yunsoo Choi, Arash Kashfi Yeganeh, Arman Pouyaei, Jia Jung, Jincheol Park, Mark W. Shephard, Enrico Dammers, Karen E. Cady-Pereira
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::faf144bf90af7ad3a41f01991d42c311
https://doi.org/10.2139/ssrn.4395242
https://doi.org/10.2139/ssrn.4395242
Autor:
Shelley van der Graaf, Enrico Dammers, Arjo Segers, Richard Kranenburg, Martijn Schaap, Mark W. Shephard, Jan Willem Erisman
Publikováno v:
Atmospheric Chemistry and Physics. 22:951-972
Atmospheric levels of ammonia (NH3) have substantially increased during the last century, posing a hazard to both human health and environmental quality. The atmospheric budget of NH3, however, is still highly uncertain due to an overall lack of obse