Results 21 to 30 of about 5,576 (50)

Post-process correction improves the accuracy of satellite PM_2.5 retrievals [PDF]

Atmospheric Measurement Techniques
Estimates of PM2.5 levels are crucial for monitoring air quality and studying the epidemiological impact of air quality on the population. Currently, the most precise measurements of PM2.5 are obtained from ground stations, resulting in limited spatial ...
A. Porcheddu, V. Kolehmainen, T. Lähivaara, A. Lipponen   +3 more
doaj   +1 more source

Greenhouse gas column observations from a portable spectrometer in Uganda [PDF]

Atmospheric Measurement Techniques
The extensive terrestrial ecosystems of tropical Africa are a significant store of carbon and play a key but uncertain role in the atmospheric budgets of carbon dioxide and methane.
N. Humpage, N. Humpage, H. Boesch, H. Boesch, H. Boesch, W. Okello, J. Chen, F. Dietrich, M. F. Lunt, M. F. Lunt, L. Feng, L. Feng, P. I. Palmer, P. I. Palmer, F. Hase   +14 more
doaj   +1 more source

A quality control method based on physical constraints and data-driven collaborative artificial intelligence for wind observations along high-speed railway lines [PDF]

Atmospheric Measurement Techniques
This study proposed a new quality control method via physical constraints and data-driven collaborative artificial intelligence (PD-BX) to reduce wind speed measurement errors caused by the complex environment along high-speed railway lines, achieving ...
X. Xiong, J. Chen, Y. Zhang, X. Chen, Y. Zhang, X. Ye   +5 more
doaj   +1 more source

Distribution characteristics of the summer precipitation raindrop spectrum on the Qinghai–Tibet Plateau [PDF]

Atmospheric Measurement Techniques
To enhance the precision of precipitation forecasting in the Qinghai–Tibet Plateau region, a comprehensive study of both macro- and micro-characteristics of local precipitation is imperative. In this study, we investigated the particle size distribution,
F. Wang, F. Wang, Y. Duan, Y. Huo, Y. Huo, Y. Cao, Q. Wang, T. Zhang, J. Liu, G. Cao   +9 more
doaj   +1 more source

Deployment and evaluation of an NH₄⁺∕ H₃O⁺ reagent ion switching chemical ionization mass spectrometer for the detection of reduced and oxygenated gas-phase organic compounds [PDF]

Atmospheric Measurement Techniques
Reactive organic carbon (ROC) is diverse in its speciation, functionalization, and volatility, with varying implications for ozone production and secondary organic aerosol formation and growth.
C. L. Zang, M. D. Willis
doaj   +1 more source

JAXA Level 2 cloud and precipitation microphysics retrievals based on EarthCARE radar, lidar, and imager: the CPR_CLP, AC_CLP, and ACM_CLP products [PDF]

Atmospheric Measurement Techniques
This study introduces the primary products and features of active-sensor-based Level 2 cloud microphysics products of the Japanese Aerospace Exploration Agency (JAXA; i.e., the cloud radar standalone cloud product (CPR_CLP), the radar–lidar synergy cloud
K. Sato, H. Okamoto, T. Nishizawa, Y. Jin, T. Y. Nakajima, M. Wang, M. Satoh, W. Roh, W. Roh, H. Ishimoto, R. Kudo   +10 more
doaj   +1 more source

Retrieval of NO₂ profiles from 3 years of Pandora MAX-DOAS measurements in Toronto, Canada [PDF]

Atmospheric Measurement Techniques
The purpose of this work is to derive new nitrogen dioxide (NO2) vertical profiling data products from Pandora spectrometers and investigate the factors contributing to the bias of this dataset relative to established ground-based and spaceborne datasets.
R. Alwarda, R. Alwarda, K. Bognar, X. Zhao, V. Fioletov, J. Davies, S. C. Lee, D. Griffin, A. Lupu, U. Frieß, A. Cede, A. Cede, Y. Su, K. Strong   +13 more
doaj   +1 more source

Revised methodology for CO₂ and CH₄ measurements at remote sites using a working standard-gas-saving system [PDF]

Atmospheric Measurement Techniques
We have revised a calculation method of mole fractions and uncertainties for in situ CO2 and CH4 measurements with a working standard-gas-saving system. It uses on-site compressed air to track the baseline drift of sensors. The Japan–Russia Siberian Tall
M. Sasakawa, N. Tsuda, T. Machida, M. Arshinov, D. Davydov, A. Fofonov, B. Belan   +6 more
doaj   +1 more source

Reconstruction of 3D precipitation measurements from FY-3G MWRI-RM imaging and sounding channels [PDF]

Atmospheric Measurement Techniques
The Fengyun-3G satellite (FY-3G), China's first precipitation measurement satellite, was launched on 17 April 2023. FY-3G carries the advanced Multi-Channel Microwave Radiance Imager-Rainfall Measurement (MWRI-RM) system, which, compared to the previous ...
Y. Yang, Y. Yang, W. Han, W. Han, H. Sun, H. Sun, J. Li, J. Yan, Z. Gao, Z. Gao   +9 more
doaj   +1 more source

The impact of differences in retrieval algorithms between processing centers on GNSS radio occultation refractivity retrievals in the planetary boundary layer [PDF]

Atmospheric Measurement Techniques
Global Navigation Satellite System radio occultation (GNSS RO) performance in the planetary boundary layer is strongly dependent on retrieval algorithms. In this work, we characterize differences in refractivity retrievals in the planetary boundary layer
S. Vannah, S. S. Leroy, C. O. Ao, E. R. Kursinski, K. J. Nelson, K.-N. Wang, F. Xie   +6 more
doaj   +1 more source