Abstract
An experiment of measuring soil moisture was carried out by using dual-frequency microwave radiometer designed by the authors. The measured data were analyzed by using statistical regression method and the empirical regression model of retrieving soil moisture in L-band and C-band was developed. The soil moisture in a rainfall event was retrieved using the experiential regression model, which is consistent well with the field sampling value. The results show that when soil moisture is lower than 75%, the brightness temperature is linear with soil moisture. However, when soil moisture is higher than 75%, the brightness temperature is not linear with soil moisture, so it is difficult for microwave radiometer to measure the changes of soil moisture. The experiment verifies the effectiveness and feasibility of microwave remote sensing soil moisture. Although this method for linear regression based on the data measured with the radiometer is simple, and has strong adaptability, generally it has only local application value, and lacks universal applicability for different areas and different conditions.
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References
DELWORTH T, MANABE S, 1989. The influence of soil wetness on near-surface atmospheric variability [J]. Journal of Climate, 2(12): 1447–1462.
HRUK VAN DEN B J J M, BELJAARS A C M, 1996. Impact of some simplifying assumptions in the new ECMWF surface scheme [J]. J. Applied Meteorol., 35: 1333–1343.
JACKSON T J, LE VINE D M, GRIFFIS A et al., 1993. Soil moisture and rainfall estimation over a semiarid environment with the ESTAR microwave radiometer [J]. IEEE Transactions on Geoscience and Remote Sensing, 31: 836–841.
JIN Ya-qiu, ZHANG Jun-rong, ZHAO Ren-yu, 1990. Remote sensing of soil moisture by multi-frequency microwave radiometer and numerical calculation [R]. In: Annual Report of Changchun Jingyuetan Remote Sensing Test Site of Chinese Academy of Sciences 1989–1990 [C]. Changchun: Jilin People’s Press, 53–61. (in Chinese)
MAGAGI R D, KERR Y H, MEUNIER J C, 2000. Results of combining L and C band passive microwave airborne data over the Sahelian area [J]. IEEE Transactions on Geoscience and Remote Sensing, 38(4): 1997–2008.
SHI Jian-cheng, CHEN K S, LI Q et al., 2003. A parameterized surface reflectivity model and estimation of bare surface soil moisture with L-band radiometer [J]. IEEE Transactions on Geoscience and Remote Sensing, 41(12): 2674–2686.
SHUKLA J, MINTZ Y, 1982. Influence of land-surface evapotranspiration on the earth’s climate [J]. Science, 215: 1498–1501.
WANG J R, SCHMUGGE T J, 1980. An empirical model for the complex dielectric permitivity of soils as a function of water content [J]. IEEE Transactions on Geoscience and Remote Sensing, 18(4): 288–295.
WIGNERON J P, LAGUERRE L, KERR Y H, 2001. A simple parameterization of the L-band microwave emission from rough agricultural soil [J]. IEEE Transactions on Geoscience and Remote Sensing, 39(8): 1697–1707.
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Foundation item: Under the auspices of Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-309)
Biography: GUAN Zhi (1978-), female, a native of Changchun of Jilin Province, Ph.D. candidate, specialized in GPS Bistatic Radar Remote Sensing. E-mail: ccguanz@neigae.ac.cn
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Guan, Z., Zhao, K. & Song, Ds. Experimental study on soil moisture using dual-frequency microwave radiometer. Chin. Geograph.Sc. 16, 83–86 (2006). https://doi.org/10.1007/s11769-006-0027-0
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DOI: https://doi.org/10.1007/s11769-006-0027-0