Results 11 to 20 of about 28,409 (225)

Field comparison of network Sun photometers [PDF]

Journal of Geophysical Research: Atmospheres, 2003
Measurements of aerosol optical depth have become more numerous since the mid‐1990s with the onset of commercially available, high‐quality, low‐maintenance automatic instrumentation. The development of several networks for aerosol measurements, and the next day availability of preliminary data for some, have further enhanced interest in the products ...
L. J. Bruce McArthur, David H. Halliwell, Ormanda J. Niebergall, Norm T. O'Neill, James R. Slusser, Christoph Wehrli   +5 more
openaire   +1 more source

Verification of CALIOP, MODIS, MISR, and OMI aerosol optical depth retrievals against Sun-photometer data over Zanjan [PDF]

تحقیقات کاربردی علوم جغرافیایی, 2021
In this paper, aerosol optical depth measured by Caliop, MODIS, MISR, and OMI satellite sensors is compared with Sun-photometer data located in the Institute for Advanced Studies in Basic Sciences (IASBS) from December 2009 to December 2013 over Zanjan ...
Ali Bayat, Ahmad Assar Enayati, Azimeh Toshani   +2 more
doaj  

Comparison of the aerosol optical properties and size distribution retrieved by sun photometer with in situ measurements at midlatitude [PDF]

Atmospheric Measurement Techniques, 2016
Aerosols influence the Earth radiative budget through scattering and absorption of solar radiation. Several methods are used to investigate aerosol properties and thus quantify their direct and indirect impacts on climate.
A. Chauvigné, K. Sellegri, M. Hervo, N. Montoux, P. Freville, P. Goloub   +5 more
doaj   +1 more source

Detection and characterization of volcanic ash plumes over Lille during the Eyjafjallajökull eruption [PDF]

Atmospheric Chemistry and Physics, 2013
Routine sun-photometer and micro-lidar measurements were performed in Lille, northern France, in April and May 2010 during the Eyjafjallajökull volcanic eruption.
A. Mortier, P. Goloub, T. Podvin, C. Deroo, A. Chaikovsky, N. Ajtai, L. Blarel, D. Tanre, Y. Derimian   +8 more
doaj   +1 more source

Combining Sun-Photometer, PM Monitor and SMPS to Inverse the Missing Columnar AVSD and Analyze Its Characteristics in Central China

Atmosphere, 2022
Columnar aerosol volume size distribution (AVSD) is an important atmospheric parameter that shows aerosol microphysical properties and can be used to analyze the impact of aerosols on the radiation budget balance, as well as regional climate effects ...
Ao Miao, Shikuan Jin, Yingying Ma, Boming Liu, Nan Jiang, Wenzhuo He, Xiaokun Qian, Yifan Zheng   +7 more
doaj   +1 more source

Improving Langley calibrations by reducing diurnal variations of aerosol Ångström parameters [PDF]

Atmospheric Measurement Techniques, 2013
Errors in the sun photometer calibration constant lead to artificial diurnal variations, symmetric around solar noon, of the retrieved aerosol optical depth (AOD) and the associated Ångström exponent α and its curvature γ.
A. Kreuter, S. Wuttke, M. Blumthaler
doaj   +1 more source

Calibration of Raman lidar water vapor profiles by means of AERONET photometer observations and GDAS meteorological data [PDF]

Atmospheric Measurement Techniques, 2018
We present a practical method to continuously calibrate Raman lidar observations of water vapor mixing ratio profiles. The water vapor profile measured with the multiwavelength polarization Raman lidar PollyXT is calibrated by means of co-located ...
G. Dai, G. Dai, D. Althausen, J. Hofer, R. Engelmann, P. Seifert, J. Bühl, R.-E. Mamouri, S. Wu, S. Wu, A. Ansmann   +10 more
doaj   +1 more source

Ship-Based Sun Photometer Measurements Using Microtops Sun Photometers

Journal of Atmospheric and Oceanic Technology, 2001
Abstract The use of hand-held Microtops II sun photometers (built by Solar Light Inc.) on ship platforms is discussed. Their calibration, filter stability, and temperature effects are also described. It is found that under rough conditions, the ship motion causes the largest error, which can result in a bias toward higher optical depths.
John N. Porter, Mark Miller, Christophe Pietras, Craig Motell   +3 more
openaire   +1 more source

Assessment of the total precipitable water from a sun photometer, microwave radiometer and radiosondes at a continental site in southeastern Europe [PDF]

Atmospheric Measurement Techniques, 2019
In this study, we discuss the differences in the total precipitable water (TPW), retrieved from a Cimel sun photometer operating at a continental site in southeast Europe, between version 3 (V3) and version 2 (V2) of the AErosol RObotic NETwork (AERONET)
K. Fragkos, B. Antonescu, D. M. Giles, D. M. Giles, D. Ene, M. Boldeanu, G. A. Efstathiou, L. Belegante, D. Nicolae   +8 more
doaj   +1 more source

Discovery of optical pulsations in V2116 Ophiuchi/GX 1+4 [PDF]

, 1997
We report the detection of pulsations with $\sim 124$ s period in V2116 Oph, the optical counterpart of the low-mass X-ray binary GX 1+4. The pulsations are sinusoidal with modulation amplitude of up to 4% in blue light and were observed in ten different
Braga J., Bruch A., Cieslinski D., Clemens D. Gneiding, Francisco J. Jablonski, Glass I. S., Greenhill J. G., Ilovaisky S. A., João Braga, Krzeminski W., Laurent P., Manchanda R. K., Marildo G. Pereira, Mony B., Nagase F., Predehl P., Rao A. R., Shahbaz T.   +17 more
core   +2 more sources