Binary phase-shift keying optical transmission in the C-band with coherent intradyne reception is demonstrated over a long-range (10.45 km) link through the atmosphere. The link emulates representative channel conditions for geostationary optical feeder uplinks in satellite communications. The digital signal processing used in recovering the transmitted data and the performed measurements are described. Finally, the bit error rate results for 10 Gbit/s, 20 Gbit/s, and 30 Gbit/s of the outdoor experiments are presented and compared with back-to-back measurements and theory.
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http://dx.doi.org/10.1364/OL.42.002173 | DOI Listing |
J Environ Manage
December 2024
Department of Civil and Environmental Engineering, Seoul National University, Seoul, South Korea. Electronic address:
Environ Sci Technol
November 2024
Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States.
High-resolution, comprehensive exposure data are crucial for accurately estimating the human health impact of PM. In recent years, satellite remote sensing data have been increasingly utilized in PM models to overcome the limited spatial coverage of ground monitoring stations. However, data gaps in satellite-retrieved parameters such as aerosol optical depth (AOD), the sparsity of regulatory air quality monitors for model training, and nonlinear relationships between PM and meteorological conditions can affect model performance and cause data gaps in most existing PM models.
View Article and Find Full Text PDFGlob Chang Biol
July 2024
Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
The extreme dry and hot 2015/16 El Niño episode caused large losses in tropical live aboveground carbon (AGC) stocks. Followed by climatic conditions conducive to high vegetation productivity since 2016, tropical AGC are expected to recover from large losses during the El Niño episode; however, the recovery rate and its spatial distribution remain unknown. Here, we used low-frequency microwave satellite data to track AGC changes, and showed that tropical AGC stocks returned to pre-El Niño levels by the end of 2020, resulting in an AGC sink of Pg C year during 2014-2020.
View Article and Find Full Text PDFNature
March 2024
Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada.
Overnight fires are emerging in North America with previously unknown drivers and implications. This notable phenomenon challenges the traditional understanding of the 'active day, quiet night' model of the diurnal fire cycle and current fire management practices. Here we demonstrate that drought conditions promote overnight burning, which is a key mechanism fostering large active fires.
View Article and Find Full Text PDFEnviron Pollut
April 2024
Climate and Air Quality Research Department, National Institute of Environmental Research, 42 Hwangyong-ro, Seogu, 22689 Incheon, Republic of Korea.
The worst forest fires in Korean history broke out on March 4, 2022 and lasted for ten days. In order to monitor the catastrophic forest fires, Geostationary Korea Multi-Purpose Satellite (GK)-2 A Advanced Meteorological Imager (AMI) and GK-2B Geostationary Environment Monitoring Spectrometer (GEMS) data were used in this study. Aerosol optical depth (AOD) irretrievable for the biomass-burning aerosols produced with water vapor classified as could-contaminated, was reconstructed by ultraviolet aerosol index (UVAI).
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