Spatial and temporal patterns of surface soil moisture over India estimated using surface wetness index from SSM/I microwave radiometer
Authors: Singh, R. P.; Oza, S. R.; Chaudhari, K. N.; Dadhwal, V. K.
Source: International Journal of Remote Sensing, Volume 26, Number 6, 2005 , pp. 1269-1276(8)
Publisher: Taylor and Francis Ltd
Abstract:Results from an approach to infer surface soil moisture from time series analysis of surface wetness index derived using the Special Sensor Microwave/Imager (SSM/I) are presented. Soil moisture quantification was based on the study of temporal changes in surface wetness index and its scaling to maximum and air-dry limits of soil in each grid cell (0.33°). The estimated soil moisture of Illinois, USA was compared with field measured soil moisture (0–10?cm) obtained from the Global Soil Moisture Data Bank. A root mean square error of 7.18% was found between estimated and measured volumetric soil moisture. A consistency in soil moisture and rainfall pattern was found in the un-irrigated areas of northern India (Jodhpur, Varanasi) and southern India (Madurai), influenced by southwest and northeast monsoons, respectively. Soil moisture of more than 0.30 m 3 m -3 was observed in the absence of rainfall due to the irrigation of rice crop in (Punjab) during the pre-southwest monsoon period (May).
Document Type: Research Article
Affiliations: Indian Institute of Remote Sensing, Dehradun 248001, India
Publication date: March 1, 2005