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Continuous light absorption photometer for long-term studies
A new photometer is described for continuous determination of the aerosol light absorption coefficient, optimized for long-term studies of the climate-forcing properties of aerosols. Measurements of the light attenuation coefficient are made at blue, green, and red wavelengths, with a detection limit of 0.02 Mm(-1) and a precision of 4 % for hourly averages. The uncertainty of the light absorption coefficient is primarily determined by the uncertainty of the correction scheme commonly used to convert the measured light attenuation to light absorption coefficient and ranges from about 20 % at sites with high loadings of strongly absorbing aerosols up to 100 % or more at sites with low loadings of weakly absorbing aerosols. Much lower uncertainties (ca. 40 %) for the latter case can be achieved with an advanced correction scheme.
2015 | Journal of Advances in Modeling Earth Systems, 7(2), 938-962.
Description:
This paper describes a general method for the treatment of convective momentum transport (CMT) in large-scale dynamical solvers that use a cyclic, two...
2017 | Atmospheric Chemistry and Physics, 17(18), 11135-11161.
Description:
Following the recent Global Carbon Project (GCP) synthesis of the decadal methane (CH4) budget over 2000-2012 (Saunois et al., 2016), we analyse here ...
2018 | Journal of Geophysical Research-Atmospheres, 123(21), 12368-12393.
Description:
We examine the distribution and fate of nitrogen oxides (NOx) in the lower troposphere over the Northeast United States (NE US) using aircraft observa...
2017 | Atmospheric Chemistry and Physics, 17(2), 1161-1186.
Description:
We report measurements of CH4 (measured in situ by the Harvard University Picarro Cavity Ringdown Spectrometer (HUPCRS) and NOAA Unmanned Aircraft Sys...
VOCs related to oil and gas extraction operations in the United States were measured by H3O+ chemical ionization time-of-flight mass spectrometry (H3O...
2017 | Atmospheric Chemistry and Physics, 17(8), 5331-5354.
Description:
Ambient pine forest air was oxidized by OH, O-3, or NO3 radicals using an oxidation flow reactor (OFR) during the BEACHON-RoMBAS (Bio-hydro-atmosphere...
2017 | Journal of Advances in Modeling Earth Systems, 9(1), 627-646.
Description:
Low and high clouds of shallow extent, especially stratocumulus and even more so for high-level cirrus clouds that reside where vertical resolution is...
The sum of all reactive nitrogen species (NOy) includes NOx (NO2 + NO) and all of its oxidized forms, and the accurate detection of NOy is critical to...
2019 | Journal of Great Lakes Research, 45(3), 536-546.
Description:
NOAA GLERL has routinely flown a hyperspectral imager to detect cyanobacteria harmful algal blooms (cyanoHABs) over the Great Lakes since 2015. Three ...
The optical backscattering from particles in the ocean is an important quantity that has been measured by remote sensing techniques and in situ instru...
2017 | Journal of Geophysical Research-Atmospheres, 122(7), 3944-3952.
Description:
In the current study, the electromagnetic properties of porous aerosol particles are calculated in two ways. In the first, a porous target input file ...
2016 | Environmental Research Letters, 11(6), 064017.
Description:
Due to the success of the Montreal Protocol in limiting emissions of ozone-depleting substances, concentrations of atmospheric carbon dioxide, nitrous...
2017 | Atmospheric Chemistry and Physics, 17(11), 7193-7212.
Description:
Measurements of primary biological aerosol particles (PBAP), especially at altitudes relevant to cloud formation, are scarce. Single-particle mass spe...
2017 | Journal of Geophysical Research-Atmospheres, 122(22), 12416-12432.
Description:
We report on measurements of acyl peroxy nitrates (APNs) obtained from two ground sites and the NSF/National Center for Atmospheric Research C-130 air...
2017 | Journal of Geophysical Research-Atmospheres, 122(2), 1261-1280.
Description:
Much attention has been focused on the transport of ozone (O-3) to the western U.S., particularly given the latest revision of the National Ambient Ai...
2017 | Atmospheric Chemistry and Physics, 17(4), 2881-2899.
Description:
To investigate the effect of additional CO2 observations in the Siberia region on the Asian and global surface CO2 flux analyses, two experiments usin...
At local scales, emissions of methane and carbon dioxide are highly uncertain. Localized sources of both trace gases can create strong local gradients...
2017 | Atmospheric Chemistry and Physics, 17(24), 15151-15165.
Description:
This study analyzes seasonal and spatial patterns of column carbon dioxide (CO2) over North America, calculated from aircraft and tall tower measureme...
2017 | Atmospheric Chemistry and Physics, 17(4), 2721-2739.
Description:
NH3 retrievals from the NASA Tropospheric Emission Spectrometer (TES), as well as surface and aircraft observations of NH3(g) and submicron NH4(p), ar...
2015 | Journal of Hydrometeorology, 16(4), 1636-1657.
Description:
This paper summarizes and synthesizes the research carried out under the NOAA Drought Task Force (DTF) and submitted in this special collection. The D...
Long-term measurements of atmospheric mass concentrations of black carbon (BC) are needed to investigate changes in its emission, transport, and depos...
2017 | Journal of Geophysical Research: Atmospheres, 122(6), 3544-3572
Description:
Long-term measurements of the light absorption coef ficient ( babs) obtained with a particle soot absorption photometer (PSAP), babs(PSAP), have been...
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