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94 results on '"Liu, Gin-Rong"'

5. An overview of regional experiments on biomass burning aerosols and related pollutants in Southeast Asia: From BASE-ASIA and the Dongsha Experiment to 7-SEAS

Author

Lin, Neng-Huei, Tsay, Si-Chee, Maring, Hal B., Yen, Ming-Cheng, Sheu, Guey-Rong, Wang, Sheng-Hsiang, Chi, Kai Hsien, Chuang, Ming-Tung, Ou-Yang, Chang-Feng, Fu, Joshua S., Reid, Jeffrey S., Lee, Chung-Te, Wang, Lin-Chi, Wang, Jia-Lin, Hsu, Christina N., Sayer, Andrew M., Holben, Brent N., Chu, Yu-Chi, Nguyen, Xuan Anh, Sopajaree, Khajornsak, Chen, Shui-Jen, Cheng, Man-Ting, Tsuang, Ben-Jei, Tsai, Chuen-Jinn, Peng, Chi-Ming, Schnell, Russell C., Conway, Tom, Chang, Chang-Tang, Lin, Kuen-Song, Tsai, Ying I., Lee, Wen-Jhy, Chang, Shuenn-Chin, Liu, Jyh-Jian, Chiang, Wei-Li, Huang, Shih-Jen, Lin, Tang-Huang, and Liu, Gin-Rong

Published
2013
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9. Modified Bowen ratio method in near-sea-surface air temperature estimation by using satellite data

Author

Liu, Chung-Chih, Liu, Gin-Rong, Chen, Wann-Jin, and Yang, Hong-Yu

Subjects
Remote sensing -- Research, Satellite imaging -- Research, Business, Earth sciences, Electronics and electrical industries
Abstract

The near-sea-surface air temperature can be derived through Special Sensor Microwave/Imager (SSM/I) microwave and Geostationary Meteorological Satellite (GMS-5) infrared data by using a so-called modified Bowen ratio method (MBRM). A specified value ([kappa]) that was defined to be a ratio between bulk coefficients [c.sub.e] and [c.sub.h] was viewed as a constant and was input into this retrieval model for the derivation of near-sea-surface air temperature. However, there is insufficient evidence to prove the hypothesis why the specified value can be viewed as a constant and used in this model. This study strives in providing an answer. By using the iterative technique, the fact that the optimal [kappa] value oscillated merely within a small range for present experimental area covering the area from 10[degrees]N to 30[degrees]N and 105[degrees]E to 135[degrees]E is shown clearly. The small oscillation does not strongly affect the value of the derived near-sea-surface air temperature. Therefore, the optimal [kappa] value could be considered as a constant both temporally and spatially. Moreover, the results show that the rmse of the estimated near-sea-surface air temperature from SSM/I and GMS-5 data are 1.46 and 1.69 K, respectively. Therefore, the MBRM may be a good approach to estimate this parameter. However, the optimal [kappa] proposed in this study may be suitable only to present experimental area. Generally speaking, this is due to the fact that the [kappa] values are usually larger further to the north (in higher latitudes) than to the south (in lower latitudes) and also during the cold season than in the warm season. Index Terms--Modified Bowen ratio method (MBRM), nearsea-surface air temperature, optimal [kappa] value.

Published
2003

10. Profiling Transboundary Aerosols over Taiwan and Assessing Their Radiative Effects

Author

Wang, Sheng-Hsiang, Lin, Neng-Huei, Chou, Ming-Dah, Tsay, Si-Chee, Welton, Ellsworth J, Hsu, N. Christina, Giles, David M, Liu, Gin-Rong, and Holben, Brent N

Subjects
Meteorology And Climatology
Abstract

A synergistic process was developed to study the vertical distributions of aerosol optical properties and their effects on solar heating using data retrieved from ground-based radiation measurements and radiative transfer simulations. Continuous MPLNET and AERONET observations were made at a rural site in northern Taiwan from 2005 to 2007. The aerosol vertical extinction profiles retrieved from ground-based lidar measurements were categorized into near-surface, mixed, and two-layer transport types, representing 76% of all cases. Fine-mode (Angstrom exponent, alpha, approx.1.4) and moderate-absorbing aerosols (columnar single-scattering albedo approx.0.93, asymmetry factor approx.0.73 at 440 nm wavelength) dominated in this region. The column-integrated aerosol optical thickness at 500 nm (tau(sub 500nm)) ranges from 0.1 to 0.6 for the near-surface transport type, but can be doubled in the presence of upper-layer aerosol transport. We utilize aerosol radiative efficiency (ARE; the impact on solar radiation per unit change of tau(sub 500nm)) to quantify the radiative effects due to different vertical distributions of aerosols. Our results show that the ARE at the top-of-atmosphere (-23 W/ sq m) is weakly sensitive to aerosol vertical distributions confined in the lower troposphere. On the other hand, values of the ARE at the surface are -44.3, -40.6 and -39.7 W/sq m 38 for near-surface, mixed, and two-layer transport types, respectively. Further analyses show that the impact of aerosols on the vertical profile of solar heating is larger for the near-surface transport type than that of two-layer transport type. The impacts of aerosol on the surface radiation and the solar heating profiles have implications for the stability and convection in the lower troposphere.

Published
2010

16. A Contrast and Comparison of Near-Sea Surface Air Temperature/Humidity From GMS and SSM/I Data With an Improved Algorithm

Author

Liu, Gin-Rong, Liu, Chung-Chih, and Kuo, Tsung-Hua

Subjects
United States. Department of Defense. Defense Meteorological Satellite Program -- Practice, South China Sea -- Environmental aspects, Geostationary satellites -- Usage, Meteorology -- Equipment and supplies, Temperature measurements -- Equipment and supplies, Remote sensing -- Equipment and supplies, Microwaves -- Usage, Ocean-atmosphere interaction -- Measurement, Infrared sources -- Usage, Earth sciences -- Research, Business, Earth sciences, Electronics and electrical industries
Abstract

With data sets gained from Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave/Imager (SSM/I) microwave channels, Geostationary Meteorological Satellite (GMS-5) infrared channels, and ship-measured data, the statistical algorithms to estimate sea surface temperature and near-sea surface air humidity around Taiwan and the South China Sea areas are developed. Then a new, improved method to estimate near-sea surface air temperature based on the algorithm proposed by Konda et al. [1] is established in this study. The results estimated with SSM/I data show that the root mean square error (RMSE) of SST, near-sea surface air humidity and air temperature over the oceans around Taiwan and the South China Sea are 1.2 K, 1.43 g/kg, and 1.6 K, respectively. The results with GMS data are 1.7 K, 1.71 g/kg and 1.7 K, respectively. The results also show that the improvements in the algorithm of Konda et al. [1] simplify the computation scheme, improve the accuracy, and match the regional ocean-atmosphere properties in retrieving near-sea surface air temperature. The estimate produced using SSM/I and GMS data also show good consistency between them, both in temporal and spatial variations. Basically, the accuracy of this result implies strong potential for application of satellite data to relative studies and operational work in the ocean-atmosphere interaction. Index Terms--Geostationary Meteorological Satellite (GMS), near-sea surface air humidity, near-sea surface air temperature, Special Sensor Microwave/Imager (SSM/I).

Published
2001

26. SPACEBORNE MICROWAVE REMOTE SENSING MISSIONS PLANNING IN TAIWAN FOR DISASTERS MANAGEMENT

Author

YAUNG, James Yu-Chen, TSAI, Jih-Run, YU, Shiann-Jeng, LIU, Gin-Rong, CHEN, Kun-Shan, CHUNG, Shyh-Jong, and CHEN, Wann-Jin

Subjects
Microwave Remote Sensing, Satellite Mission, Disasters Early Warning, ComputerApplications_COMPUTERSINOTHERSYSTEMS
Abstract

With the Eurasia supercontinent at her west and the Pacific Ocean at east, Taiwan is in one of the most prevalent monsoon areas. Monsoons or typhoons bring along heavy precipitation that produce great threat of mud slide and land slide in the mountains. Remote sensing satellites have been developed into a powerful environment monitoring tool for the countries with space access capability. Potential disasters occurring in remote mountain areas can only rely on satellite monitoring to provide in-time early warning information before, during, and after heavy rain. Microwave remote sensing satellite, with its advantages of all-weather and night-vision capabilities and wide swath, can provide not only in-time footprint coverage at the desired disaster locations such as barrier lakes (堰塞湖), oil spill, wildfires, etc., but also general environment monitoring and disasters assessment, general resources survey and management support. In addition to the commercial data/information providers like the Astrium GEO Information Services and the MDA RADARSAT data provider, the data right issue and data availability prioritization to the users in other countries of the world remains to be an existing practice of the national satellite data/information providers, especially for sensitive data. Therefore, two microwave satellite remote sensing missions (via spaceborne active Synthetic Aperture Radar (SAR) and passive MicroWave Radiometer (MWR) remote sensing techniques) have been planned by the National SPace Organization (NSPO) mission development teams in Taiwan. The two missions have been independently planned by selecting its own mission orbit and mission system architecture for maximizing the data/information acquisition for the disasters locations (such as those SAR data for assets, risk, hazard, reference, and rapid mappings) or the rainfall information via MWR remote sensing for monitoring of the incoming typhoons and monsoons (out of the ranging distances of radars in the Taiwan island) with the capability of providing early warning information for the disasters management community.

Published
2012

31. Evaluations of cirrus contamination and screening in ground aerosol observations using collocated lidar systems

Author

Huang, Jingfeng, primary, Hsu, N. Christina, additional, Tsay, Si-Chee, additional, Holben, Brent N., additional, Welton, Ellsworth J., additional, Smirnov, Alexander, additional, Jeong, Myeong-Jae, additional, Hansell, Richard A., additional, Berkoff, Timothy A., additional, Liu, Zhaoyan, additional, Liu, Gin-Rong, additional, Campbell, James R., additional, Liew, Soo Chin, additional, and Barnes, John E., additional

Published
2012
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49. Meteorology-hydrology study targets Typhoon Nari and Taipei flood

Author

Sui, Chung Hsiung, primary, Huang, Ching-Yuang, additional, Tsai, Yi-Ben, additional, Chen, Ching-Sen, additional, Lin, Pay-Liam, additional, Shieh, Shinn-Liang, additional, Li, Ming-Hsu, additional, Liou, Yuei-An, additional, Wang, Tai-Chi Chen, additional, Wu, Ray-Shyan, additional, Liu, Gin-Rong, additional, and Chu, Yen-Hsyang, additional

Published
2002
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