scholarly journals Column closure studies of lower tropospheric aerosol and water vapor during ACE-Asia using airborne Sun photometer and airborne in situ and ship-based lidar measurements

2003 ◽  
Vol 108 (D23) ◽  
pp. ACE 24-1-ACE 24-22 ◽  
Author(s):  
B. Schmid
Keyword(s):  
Water Vapor ◽  
Tropospheric Aerosol ◽  
Lidar Measurements ◽  
Sun Photometer

scholarly journals Clear-sky closure studies of lower tropospheric aerosol and water vapor during ACE-2 using airborne sunphotometer, airborne in-situ, space-borne, and ground-based measurements

Tellus B ◽  
2000 ◽  
Vol 52 (2) ◽  
pp. 568-593 ◽  
Author(s):  
Beat Schmid ◽  
John M. Livingston ◽  
Philip B. Russell ◽  
Philip A. Durkee ◽  
Haflidi H. Jonsson ◽  
...  
Keyword(s):  
Water Vapor ◽  
Clear Sky ◽  
Tropospheric Aerosol

scholarly journals Clear-sky closure studies of lower tropospheric aerosol and water vapor during ACE-2 using airborne sunphotometer, airborne in-situ, space-borne, and ground-based measurements

Tellus B ◽  
2000 ◽  
Vol 52 (2) ◽  
pp. 568-593 ◽  
Author(s):  
Beat Schmid ◽  
John M. Livingston ◽  
Philip B. Russell ◽  
Philip A. Durkee ◽  
Haflidi H. Jonsson ◽  
...  
Keyword(s):  
Water Vapor ◽  
Clear Sky ◽  
Tropospheric Aerosol

scholarly journals Comparison of Water Vapor Measurements by Airborne Sun Photometer and Diode Laser Hygrometer on the NASA DC-8

2008 ◽  
Vol 25 (10) ◽  
pp. 1733-1743 ◽  
Author(s):  
J. M. Livingston ◽  
B. Schmid ◽  
P. B. Russell ◽  
J. R. Podolske ◽  
J. Redemann ◽  
...  
Keyword(s):  
Water Vapor ◽  
Diode Laser ◽  
Free Stream ◽  
Vapor Density ◽  
Aircraft Fuselage ◽  
Sun Photometer ◽  
Local Water ◽  
Highly Correlated ◽  
First Time

Abstract In January–February 2003, the 14-channel NASA Ames airborne tracking sun photometer (AATS) and the NASA Langley/Ames diode laser hygrometer (DLH) were flown on the NASA DC-8 aircraft. The AATS measured column water vapor on the aircraft-to-sun path, while the DLH measured local water vapor in the free stream between the aircraft fuselage and an outboard engine cowling. The AATS and DLH measurements have been compared for two DC-8 vertical profiles by differentiating the AATS column measurement and/or integrating the DLH local measurement over the altitude range of each profile (7.7–10 km and 1.1–12.5 km). These comparisons extend, for the first time, tests of AATS water vapor retrievals to altitudes >∼6 km and column contents <0.1 g cm−2. To the authors’ knowledge, this is the first time suborbital spectroscopic water vapor measurements using the 940-nm band have been tested in conditions so high and dry. Values of layer water vapor (LWV) calculated from the AATS and DLH measurements are highly correlated for each profile. The composite dataset yields r 2 0.998, rms difference 7.7%, and bias (AATS minus DLH) 1.0%. For water vapor densities AATS and DLH had r 2 0.968, rms difference 27.6%, and bias (AATS minus DLH) −4.2%. These results for water vapor density compare favorably with previous comparisons of AATS water vapor to in situ results for altitudes <∼6 km, columns ∼0.1 to 5 g cm−2, and densities ∼0.1 to 17 g m−3.

scholarly journals Comparison of water vapor measurements by airborne Sun photometer and near-coincident in situ and satellite sensors during INTEX/ITCT 2004

2007 ◽  
Vol 112 (D12) ◽  
Author(s):  
J. Livingston ◽  
B. Schmid ◽  
J. Redemann ◽  
P. B. Russell ◽  
S. A. Ramirez ◽  
...  
Keyword(s):  
Water Vapor ◽  
Satellite Sensors ◽  
Sun Photometer

scholarly journals Intercomparison of in-situ aircraft and satellite aerosol measurements in the stratosphere

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Oscar S. Sandvik ◽  
Johan Friberg ◽  
Bengt G. Martinsson ◽  
Peter F. J. van Velthoven ◽  
Markus Hermann ◽  
...  
Keyword(s):  
Stratospheric Aerosol ◽  
Aerosol Composition ◽  
Tropospheric Aerosol ◽  
Lidar Measurements ◽  
Northern Hemispheric ◽  
Extratropical Tropopause ◽  
Passenger Aircraft ◽  
First Time

Abstract Aerosol composition and optical scattering from particles in the lowermost stratosphere (LMS) have been studied by comparing in-situ aerosol samples from the IAGOS-CARIBIC passenger aircraft with vertical profiles of aerosol backscattering obtained from the CALIOP lidar aboard the CALIPSO satellite. Concentrations of the dominating fractions of the stratospheric aerosol, being sulphur and carbon, have been obtained from post-flight analysis of IAGOS-CARIBIC aerosol samples. This information together with literature data on black carbon concentrations were used to calculate the aerosol backscattering which subsequently is compared with measurements by CALIOP. Vertical optical profiles were taken in an altitude range of several kilometres from and above the northern hemispheric extratropical tropopause for the years 2006-2014. We find that the two vastly different measurement platforms yield different aerosol backscattering, especially close to the tropopause where the influence from tropospheric aerosol is strong. The best agreement is found when the LMS is affected by volcanism, i.e., at elevated aerosol loadings. At background conditions, best agreement is obtained some distance (>2 km) above the tropopause in winter and spring, i.e., at likewise elevated aerosol loadings from subsiding aerosol-rich stratospheric air. This is to our knowledge the first time the CALIPSO lidar measurements have been compared to in-situ long-term aerosol measurements.

Lidar measurements of tropospheric aerosol and water vapor profiles during the winter season campaigns over the metropolitan area of Sao Paulo, Brazil

2014 ◽  
Author(s):  
Fábio J. S. Lopes ◽  
Gregori A. Moreira ◽  
Patricia F. Rodrigues ◽  
Juan Luis Guerrero-Rascado ◽  
Maria F. Andrade ◽  
...  
Keyword(s):  
Water Vapor ◽  
Metropolitan Area ◽  
Winter Season ◽  
Sao Paulo ◽  
São Paulo ◽  
Tropospheric Aerosol ◽  
Lidar Measurements

scholarly journals In-situ NiO nanostructure growth during heating in water vapor atmosphere

2021 ◽  
Vol 27 (S1) ◽  
pp. 2102-2103
Author(s):  
Boyi Qu ◽  
Klaus van Benthem
Keyword(s):  
Water Vapor ◽  
Water Vapor Atmosphere

In situ FTIR studies of CO oxidation over Fe-free and Fe-promoted PtY catalysts: Effect of water vapor addition

2011 ◽  
Vol 344 (1-2) ◽  
pp. 111-121 ◽  
Author(s):  
Zeinhom M. El-Bahy ◽  
Ahmed I. Hanafy ◽  
Mohamed M. Ibrahim ◽  
Masakazu Anpo
Keyword(s):  
Water Vapor ◽  
Co Oxidation ◽  
In Situ Ftir ◽  
Effect Of Water ◽  
Ftir Studies

Simultaneous lidar measurements of wind, temperature, water vapor, and nonsphericity of aerosol in the troposphere

2001 ◽  
Author(s):  
Makoto Abo ◽  
Chikao Nagasawa ◽  
Yasukuni Shibata ◽  
Masahiro Funada
Keyword(s):  
Water Vapor ◽  
Lidar Measurements ◽  
Temperature Water

scholarly journals Aerosol optical and microphysical retrievals from a hybrid multiwavelength lidar data set – DISCOVER-AQ 2011

2014 ◽  
Vol 7 (9) ◽  
pp. 3095-3112 ◽  
Author(s):  
P. Sawamura ◽  
D. Müller ◽  
R. M. Hoff ◽  
C. A. Hostetler ◽  
R. A. Ferrare ◽  
...  
Keyword(s):  
Remote Sensing ◽  
In Situ Measurements ◽  
Index Of Refraction ◽  
High Spectral Resolution ◽  
Lidar Data ◽  
Data Set ◽  
Microphysical Properties ◽  
Lidar Measurements ◽  
Multiwavelength Lidar

Abstract. Retrievals of aerosol microphysical properties (effective radius, volume and surface-area concentrations) and aerosol optical properties (complex index of refraction and single-scattering albedo) were obtained from a hybrid multiwavelength lidar data set for the first time. In July 2011, in the Baltimore–Washington DC region, synergistic profiling of optical and microphysical properties of aerosols with both airborne (in situ and remote sensing) and ground-based remote sensing systems was performed during the first deployment of DISCOVER-AQ. The hybrid multiwavelength lidar data set combines ground-based elastic backscatter lidar measurements at 355 nm with airborne High-Spectral-Resolution Lidar (HSRL) measurements at 532 nm and elastic backscatter lidar measurements at 1064 nm that were obtained less than 5 km apart from each other. This was the first study in which optical and microphysical retrievals from lidar were obtained during the day and directly compared to AERONET and in situ measurements for 11 cases. Good agreement was observed between lidar and AERONET retrievals. Larger discrepancies were observed between lidar retrievals and in situ measurements obtained by the aircraft and aerosol hygroscopic effects are believed to be the main factor in such discrepancies.

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