scholarly journals Atmospheric Profile Retrieval Algorithm for Next Generation Geostationary Satellite of Korea and Its Application to the Advanced Himawari Imager

2017 ◽  
Vol 9 (12) ◽  
pp. 1294 ◽  
Author(s):  
Su Lee ◽  
Myoung-Hwan Ahn ◽  
Sung-Rae Chung
Keyword(s):  
Geostationary Satellite ◽  
Retrieval Algorithm ◽  
Next Generation ◽  
Atmospheric Profile

Evaluation of Atmospheric Profile Retrieval Algorithm for GK2A Satellite with Dropsonde Observations

2019 ◽  
Vol 56 (2) ◽  
pp. 225-233
Author(s):  
Tae-Myung Kim ◽  
Su Jeong Lee ◽  
Myoung-Hwan Ahn ◽  
Sung-Rae Chung
Keyword(s):  
Retrieval Algorithm ◽  
Atmospheric Profile

A Characterization of Cirrus Cloud Properties That Affect Laser Propagation

2008 ◽  
Vol 47 (5) ◽  
pp. 1322-1336
Author(s):  
Donald C. Norquist ◽  
Paul R. Desrochers ◽  
Patrick J. McNicholl ◽  
John R. Roadcap
Keyword(s):  
Particle Size ◽  
High Altitude ◽  
Satellite Imagery ◽  
Geostationary Satellite ◽  
Retrieval Algorithm ◽  
Water Path ◽  
Ice Water Path ◽  
Laser Extinction ◽  
Ice Water ◽  
Transmission Models

Abstract Future high-altitude laser systems may be affected by cirrus clouds. Laser transmission models were applied to measured and retrieved cirrus properties to determine cirrus impact on power incident on a target or receiver. A major goal was to see how well radiosondes and geostationary satellite imagery could specify the required properties. Based on the use of ground-based radar and lidar measurements as a reference, errors in cirrus-top and cirrus-base height estimates from radiosonde observations were 20%–25% of geostationary satellite retrieval errors. Radiosondes had a perfect cirrus detection rate as compared with 80% for satellite detection. Ice water path and effective particle size were obtained with a published radar–lidar retrieval algorithm and a documented satellite algorithm. Radar–lidar particle size and ice water path were 1.5 and 3 times the satellite retrievals, respectively. Radar–lidar-based laser extinction coefficients were 55% greater than satellite values. Measured radar–lidar cirrus thickness was consistently greater than satellite-retrieved thickness, but radar–lidar microphysical retrieval required detection by both sensors at each range gate, which limited the retrievals’ vertical extent. Greater radar–lidar extinction and greater satellite-based cirrus thickness yielded comparable optical depths for the two independent retrievals. Laser extinction–transmission models applied to radiosonde-retrieved cirrus heights and satellite-retrieved microphysical properties revealed a significant power loss by all models as the laser beam transits the cirrus layer. This suggests that cirrus location is more important than microphysics in high-altitude laser test support. Geostationary satellite imagery may be insufficient in cirrus detection and retrieval accuracy. Humidity-sensitive radiosondes are a potential proxy for ground-based remote sensors in cirrus detection and altitude determination.

Evaluation of the GOES-R ABI LAP Retrieval Algorithm Using the GOES-13 Sounder

2014 ◽  
Vol 31 (1) ◽  
pp. 3-19 ◽  
Author(s):  
Yong-Keun Lee ◽  
Zhenglong Li ◽  
Jun Li ◽  
Timothy J. Schmit
Keyword(s):  
Microwave Radiometer ◽  
Precipitable Water ◽  
Retrieval Algorithm ◽  
Earth Observing System ◽  
Radiosonde Observation ◽  
Global Positioning ◽  
Atmospheric Radiation Measurement ◽  
Atmospheric Profile ◽  
Infrared Radiances ◽  
Environmental Prediction

Abstract A physical retrieval algorithm has been developed for deriving the legacy atmospheric profile (LAP) product from infrared radiances of the Advanced Baseline Imager (ABI) on board the next-generation Geostationary Operational Environmental Satellite (GOES-R) series. In this study, the GOES-R ABI LAP retrieval algorithm is applied to the GOES-13 sounder radiance measurements (termed the GOES-13 LAP retrieval algorithm in this study) for its validation as well as for potential transition of the GOES-13 LAP retrieval algorithm for the operational processing of GOES sounder data. The GOES-13 LAP retrievals are compared with five different truth measurements: radiosonde observation (raob) and microwave radiometer–measured total precipitable water (TPW) at the Atmospheric Radiation Measurement Cloud and Radiation Testbed site, conventional raob, TPW measurements from the global positioning system–integrated precipitable water NOAA network, and TPW measurements from the Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E). The results show that with the GOES-R ABI LAP retrieval algorithm, the GOES-13 sounder provides better water vapor profiles than the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) forecast fields at the levels between 300 and 700 hPa. The root-mean-square error (RMSE) and standard deviation (STD) of the GOES-13 sounder TPW are consistently reduced from those of the GFS forecast no matter which measurements are used as the truth. These substantial improvements indicate that the GOES-R ABI LAP retrieval algorithm is well prepared to provide continuity of quality to some of the current GOES sounder products, and the algorithm can be transferred to process the current GOES sounder measurements for operational product generation.

Next-generation non-geostationary satellite communication systems: link characterization and system perspective

2018 ◽  
pp. 151-179
Author(s):  
Charilaos Kourogiorgas ◽  
Apostolos Z. Papafragkakis ◽  
Athanasios D. Panagopoulos ◽  
Spiros Ventouras
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Geostationary Satellite ◽  
Next Generation ◽  
System Perspective

scholarly journals Sensitivity of formaldehyde (HCHO) column measurements from a geostationary satellite to temporal variation of the air mass factor in East Asia

2017 ◽  
Vol 17 (7) ◽  
pp. 4673-4686 ◽  
Author(s):  
Hyeong-Ahn Kwon ◽  
Rokjin J. Park ◽  
Jaein I. Jeong ◽  
Seungun Lee ◽  
Gonzalo González Abad ◽  
...  
Keyword(s):  
Optical Properties ◽  
East Asia ◽  
Temporal Variation ◽  
Temporal Changes ◽  
Geostationary Satellite ◽  
Retrieval Algorithm ◽  
Observation System ◽  
Aerosol Optical Properties ◽  
Air Mass ◽  
True Values

Abstract. We examine upcoming geostationary satellite observations of formaldehyde (HCHO) vertical column densities (VCDs) in East Asia and the retrieval sensitivity to the temporal variation of air mass factors (AMFs) considering the presence of aerosols. Observation system simulation experiments (OSSE) were conducted using a combination of a global 3-D chemical transport model (GEOS-Chem), a radiative transfer model (VLIDORT), and a HCHO retrieval algorithm developed for the Geostationary Environment Monitoring Spectrometer (GEMS), which will be launched in 2019. Application of the retrieval algorithm to simulated hourly radiances yields the retrieved HCHO VCDs, which are then compared with the GEOS-Chem HCHO VCDs as true values for the evaluation of the retrieval algorithm. In order to examine the retrieval sensitivity to the temporal variation of AMF, we examine three AMF specifications, AMFm, AMFh, and AMFmh, using monthly, hourly, and monthly mean hourly input data for their calculation, respectively. We compare the retrieved HCHO VCDs using those three AMFs and find that the HCHO VCDs with AMFh are in better agreement with the true values than the results using AMFmh and AMFm. AMFmh reflects diurnal variation of planetary boundary layer and other meteorological parameters, so that the results with AMFmh show a better performance than those with AMFm. The differences between AMFh and AMFm range from −0.76 to 0.74 in absolute value and are mainly caused by temporal changes in aerosol chemical compositions and aerosol vertical distributions, which result in −27 to 58 and −34 to 43 % changes in HCHO VCDs over China, respectively, compared to HCHO VCDs using AMFm. We apply our calculated AMF table together with OMI aerosol optical properties to OMI HCHO products in March 2006, when Asian dust storms occurred, and find −32 to 47 % changes in the retrieved HCHO columns due to temporal changes in aerosol optical properties in East Asia. The impact of aerosol temporal variability cannot be neglected for future geostationary observations.

scholarly journals A new benchmark for surface radiation products over the East Asia-Pacific region retrieved from the Himawari-8/AHI next-generation geostationary satellite

2021 ◽  
pp. 1-40
Author(s):  
Husi Letu ◽  
Takashi Y. Nakajima ◽  
Tianxing Wang ◽  
Huazhe Shang ◽  
Run Ma ◽  
...  
Keyword(s):  
East Asia ◽  
Land Surface ◽  
Radiant Energy ◽  
Geostationary Satellite ◽  
Surface Radiation ◽  
Asia Pacific ◽  
Next Generation ◽  
Spatiotemporal Resolution ◽  
Downward Radiation ◽  
Mean Square Errors

AbstractSurface downward radiation (SDR), including shortwave downward radiation (SWDR) and longwave downward radiation (LWDR), is of great importance to energy and climate studies. Considering the lack of reliable SDR data with a high spatiotemporal resolution in the East Asia-Pacific (EAP) region, we derived SWDR and LWDR at 10-min and 0.05° resolutions for this region from 2016-2020 based on the next-generation geostationary satellite Himawari-8 (H-8). The SDR product is unique in terms of its all-sky features, high accuracy and high resolution levels. The cloud effect is fully considered in the SDR product, and the influence of high aerosol loadings and topography on the SWDR are considered. Compared to benchmark products of the radiation, such as Clouds and the Earth’s Radiant Energy System (CERES) and the European Centre for Medium-Range Weather Forecasts (ECMWF) next-generation reanalysis (ERA5), and the Global Land Surface Satellite (GLASS), not only is the resolution of the new SDR product notably much higher but the product accuracy is also higher than that of those products. In particular, hourly and daily root mean square errors of the new SWDR are 104.9 and 31.5 Wm−2, respectively, which are much smaller than those of CERES (at 121.6 and 38.6 Wm−2, respectively), ERA5 (at 176.6 and 39.5 Wm−2, respectively) and GLASS (daily of 36.5 Wm−2). Meanwhile, RMSEs of hourly and daily values of the new LWDR are 19.6 and 14.4 Wm−2, respectively, which are comparable to that of CERES and ERA5, and even better over high altitude regions.

scholarly journals Sensitivity of formaldehyde (HCHO) column measurements from a geostationary satellite to aerosol temporal variation in East Asia

2016 ◽  
Author(s):  
Hyeong-Ahn Kwon ◽  
Rokjin J. Park ◽  
Jaein I. Jeong ◽  
Seungun Lee ◽  
Gonzalo González Abad ◽  
...  
Keyword(s):  
East Asia ◽  
Temporal Variation ◽  
Geostationary Satellite ◽  
Dust Storms ◽  
Radiative Transfer Model ◽  
Retrieval Algorithm ◽  
Observation System ◽  
Transfer Model ◽  
True Value ◽  
The Impact

Abstract. We examine upcoming geostationary satellite observations of formaldehyde (HCHO) columns in East Asia and the retrieval sensitivity to the temporal variation of air mass factor (AMF) considering the presence of aerosols. Observation system simulation experiments (OSSE) were conducted using a combination of a global 3-D chemical transport model (GEOS-Chem), a radiative transfer model (VLIDORT), and a HCHO retrieval algorithm developed for Geostationary Environment Monitoring Spectrometer (GEMS), which will be launched in 2019. Application of the retrieval algorithm to simulated hourly radiances yields the retrieved HCHO column concentrations, which are then compared with the GEOS-Chem HCHO columns as a true value for the evaluation of the retrieval algorithm. In order to examine the retrieval sensitivity to the temporal variation of AMF, we compare the retrieved HCHO columns using monthly versus hourly AMF values and find that the HCHO vertical columns with hourly AMF are in better agreement with the true values, relative to those with monthly AMF. The differences between hourly and monthly AMF range from −0.70 to 0.73 in absolute value and are mainly caused by temporal changes of aerosol chemical composition: scattering aerosol enhances AMF, whereas absorbing aerosol reduces it. The temporal variations of AMF caused by aerosols increase and decrease HCHO VCDs by 84 % and 34 %, respectively, compared to HCHO VCDs using monthly AMF. We apply our calculated AMF with the aerosol effects to OMI HCHO products in March, 2006 when Asian dust storms occurred and find −18 %–33 % changes in the retrieved HCHO columns in East Asia. The impact of aerosols cannot be neglected for future geostationary observations.

Sign in / Sign up

Export Citation Format

Share Document