Zobrazeno 1 - 10
of 35
pro vyhledávání: '"F M, Hopkins"'
Autor:
Z. Zhu, J. González-Rocha, Y. Ding, I. Frausto-Vicencio, S. Heerah, A. Venkatram, M. Dubey, D. Collins, F. M. Hopkins
Publikováno v:
Atmospheric Measurement Techniques, Vol 17, Pp 3883-3895 (2024)
This paper evaluates the performance of a multirotor uncrewed aircraft and AirCore system (UAAS) for measuring vertical profiles of wind velocity (speed and direction) and the mole fractions of methane (CH4) and carbon dioxide (CO2), and it presents
Externí odkaz:
https://doaj.org/article/8da4772aaf4546dbadb92c16e1632600
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 4521-4543 (2023)
With global wildfires becoming more widespread and severe, tracking their emissions of greenhouse gases and air pollutants is becoming increasingly important. Wildfire emissions have primarily been characterized by in situ laboratory and field observ
Externí odkaz:
https://doaj.org/article/0d389cc2188d4dc9b25887297f933f3b
Publikováno v:
AGU Advances, Vol 3, Iss 6, Pp n/a-n/a (2022)
Abstract Fossil fuel carbon dioxide (CO2) emissions (ffCO2) constitute the majority of greenhouse gas emissions and are the main determinant of global climate change. The COVID‐19 pandemic caused wide‐scale disruption to human activity and provid
Externí odkaz:
https://doaj.org/article/13c4bc3b1823413b9dfbdb1538ab80b0
Publikováno v:
Earth System Science Data, Vol 13, Pp 1151-1166 (2021)
Dairies emit roughly half of total methane (CH4) emissions in California, generating CH4 from both enteric fermentation by ruminant gut microbes and anaerobic decomposition of manure. Representation of these emission processes is essential for manage
Externí odkaz:
https://doaj.org/article/e1aa461af6f545738799809829654c90
Publikováno v:
Environmental Research Letters, Vol 18, Iss 9, p 094030 (2023)
In recent decades, there has been a significant increase in annual area burned in California’s Sierra Nevada mountains. This rise in fire activity has prompted the need to understand how historical forest management practices affect fuel compositio
Externí odkaz:
https://doaj.org/article/ad66a5ee0bec432092b9d4586d87bde8
Autor:
V. Carranza, T. Rafiq, I. Frausto-Vicencio, F. M. Hopkins, K. R. Verhulst, P. Rao, R. M. Duren, C. E. Miller
Publikováno v:
Earth System Science Data, Vol 10, Pp 653-676 (2018)
Methane (CH4) is a potent greenhouse gas (GHG) and a critical target of climate mitigation efforts. However, actionable emission reduction efforts are complicated by large uncertainties in the methane budget on relevant scales. Here, we present Vi
Externí odkaz:
https://doaj.org/article/4ed3cc39863a49869190ea6bc26c57bf
Autor:
K. R. Verhulst, A. Karion, J. Kim, P. K. Salameh, R. F. Keeling, S. Newman, J. Miller, C. Sloop, T. Pongetti, P. Rao, C. Wong, F. M. Hopkins, V. Yadav, R. F. Weiss, R. M. Duren, C. E. Miller
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Pp 8313-8341 (2017)
We report continuous surface observations of carbon dioxide (CO2) and methane (CH4) from the Los Angeles (LA) Megacity Carbon Project during 2015. We devised a calibration strategy, methods for selection of background air masses, calculation of ur
Externí odkaz:
https://doaj.org/article/e334f043db3a425fa25417cd687de895
Autor:
L. Kuai, J. R. Worden, K.-F. Li, G. C. Hulley, F. M. Hopkins, C. E. Miller, S. J. Hook, R. M. Duren, A. D. Aubrey
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 7, Pp 3165-3173 (2016)
We introduce a retrieval algorithm to estimate lower tropospheric methane (CH4) concentrations from the surface to 1 km with uncertainty estimates using Hyperspectral Thermal Emission Spectrometer (HyTES) airborne radiance measurements. After resampl
Externí odkaz:
https://doaj.org/article/d1f45d9930f54bcba4c5f4e6db347231
Autor:
G. C. Hulley, R. M. Duren, F. M. Hopkins, S. J. Hook, N. Vance, P. Guillevic, W. R. Johnson, B. T. Eng, J. M. Mihaly, V. M. Jovanovic, S. L. Chazanoff, Z. K. Staniszewski, L. Kuai, J. Worden, C. Frankenberg, G. Rivera, A. D. Aubrey, C. E. Miller, N. K. Malakar, J. M. Sánchez Tomás, K. T. Holmes
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 5, Pp 2393-2408 (2016)
Currently large uncertainties exist associated with the attribution and quantification of fugitive emissions of criteria pollutants and greenhouse gases such as methane across large regions and key economic sectors. In this study, data from the airbo
Externí odkaz:
https://doaj.org/article/952d35a4890d445a802e1f26501f38cc
Publikováno v:
Atmospheric Measurement Techniques, Vol 8, Iss 8, Pp 3481-3492 (2015)
Ground-based measurements of atmospheric trace gas species and criteria pollutants are essential for understanding emissions dynamics across space and time. Gas composition in the lower 50 m of the atmosphere has the greatest direct impacts on human
Externí odkaz:
https://doaj.org/article/d3d9240e0c874285b3ec30446d671cfa