Publications

  1. Paul, S., Feldman, A. F., & Karthikeyan, L. (2024). Are rootzone soil moisture dynamics and thresholds associated with surface layer? Environmental Research Letters (in press),
  2. Gupta, A., & Karthikeyan, L. (2024). Role of initial conditions and meteorological drought on soil moisture drought propagation: An event‐based causal analysis over South Asia. Earth's Future, 12, e2024ef004674.
  3. Khandare, A., Murtugudde, R., Karthikeyan, L., & Ghosh, S. (2024). Hysteresis in Seasonal Land-Atmospheric Interactions over India and its Characteristics across Croplands and Forests. Environmental Research Letters (Accepted),
  4. Navale. A, & Karthikeyan, L. (2024). Understanding tropical cyclone persistence over land: A case study of Cyclone Gulab. Environmental Research Letters, 19, 114061.
  5. Sreevalsan-Nair, J., Kiran, A., Bhattacharya, A., Sagar, B.D., Gurudatta, K.N., Verma, U., Meher, S.K. and Karthikeyan, L. (2024). InGARSS 2023 in Bangalore: Striking a Balance [Conference Reports]. IEEE Geoscience and Remote Sensing Magazine, 12(3), 180-187.
  6. Xing, Z., Li, X., Fan, L., Frappart, F., Kim, H., Karthikeyan, L., Konkathi, P., Liu, Y., Zhao, L. and Wigneron, J.P. (2024). Seasonal-scale intercomparison of SMAP and fused SMOS-SMAP soil moisture products. Frontiers in Remote Sensing, 5, 1440891.
  7. Konkathi, P., Li, X., Fernandez-Moran, R., Liu, X., Xing, Z., Frappart, F., Piles, M., Karthikeyan, L. and Wigneron, J.P. (2024). A Novel Calibration of Global Soil Roughness Effects for Smos-Ic Soil Moisture and L-Vod Products. Available at SSRN, 4830200.
  8. Konkathi, P., & Karthikeyan, L. (2024). Dynamic Vegetation Parameter Retrieval Algorithm for Smap L-Band Radiometer Observations. Available at SSRN, 4848571.
  9. Karthikeyan, L., Bhattacharya, A., Judge, J., & Yueh, S. (2023). The Second International Soil Moisture School [Conference Reports]. IEEE Geoscience and Remote Sensing Magazine,, 11, 4, 157-162.
  10. Konkathi, P., & Karthikeyan, L. (2023). Utility of L-band and X-band vegetation optical depth to examine vegetation response to soil moisture droughts in South Asia. Remote Sensing of Environment, 301, 113933.
  11. Navale, A., & Karthikeyan, L. (2023). Soil Moisture-Precipitation Feedbacks in Pre- and Post-monsoon Landfalling Tropical Cyclones in Bay of Bengal. Quarterly Journal of Royal Meteorological Society,
  12. Navale, A., & Karthikeyan, L. (2022). Understanding recycled precipitation at different spatio-temporal scales over India: An Eulerian water tagging approach. Water Resources Research, 59, e2022WR032605.
  13. Konkathi, P., & Karthikeyan, L. (2022). Error and uncertainty characterization of soil moisture and VOD retrievals obtained from L-band SMAP radiometer. Remote Sensing of Environment, 280, 113146.
  14. Bhogapurapu, N., Dey, S., Mandal, D., Bhattacharya, A., Karthikeyan, L., McNairn, H., & Rao, Y. S. (2022). Soil moisture retrieval over croplands using dual-pol L-band GRD SAR data. Remote Sensing of Environment, 271, 112900.
  15. Karthikeyan, L., & Mishra, A. K. (2021). Multi-layer high-resolution soil moisture estimation using machine learning over the United States. Remote Sensing of Environment, 266, 112706.
  16. Beck, H. E., Pan, M., Miralles, D. G., Reichle, R. H., Dorigo, W. A., Hahn, S., Sheffield, J., Karthikeyan, L., Balsamo, G., Parinussa, R. M., Van Dijk, A. I., Du, J., Kimball, J. S., Vergopolan, N., Wood, E. F. (2021). Evaluation of 18 satellite-and model-based soil moisture products using in situ measurements from 826 sensors. Hydrology and Earth System Sciences, 25(1), 17-40.
  17. Karthikeyan, L., Chawla, I., & Mishra, A. K. (2020). A review of remote sensing applications in agriculture for food security: Crop growth and yield, irrigation, and crop losses. Journal of Hydrology, 586, 124905.
  18. Chawla, I., Karthikeyan, L., & Mishra, A. K. (2020). A review of remote sensing applications for water security: Quantity, quality, 585, 124826. Journal of Hydrology, 585, 124826.
  19. Karthikeyan, L., Pan, M., Nagesh Kumar, D., & Wood, E. F. (2020). Effect of Structural Uncertainty in Passive Microwave Soil Moisture Retrieval Algorithm. Sensors, 20(4), 1225.
  20. Karthikeyan, L., Pan, M., Konings, A. G., Piles, M., Fernandez-Moran, R., Nagesh Kumar, D., & Wood, E. F. (2019). Simultaneous retrieval of global scale Vegetation Optical Depth, surface roughness, and soil moisture using X-band AMSR-E observations. Remote Sensing of Environment, 234, 111473.
  21. Karthikeyan, L., Pan, M., Wanders, N., Nagesh Kumar, D., & Wood, E. F. (2017). Four decades of microwave satellite soil moisture observations: Part 2. Product validation and inter-satellite comparisons. Advances in Water Resources, 109, 236-252.
  22. Karthikeyan, L., Pan, M., Wanders, N., Nagesh Kumar, D., & Wood, E. F. (2017). Four decades of microwave satellite soil moisture observations: Part 1. A review of retrieval algorithms. Advances in Water Resources, 109, 106-120.
  23. Karthikeyan, L., & Nagesh Kumar, D. (2016). A novel approach to validate satellite soil moisture retrievals using precipitation data. Journal of Geophysical Research Atmospheres, 121(19), 11-516.
  24. Karthikeyan, L., & Nagesh Kumar, D. (2013). Predictability of nonstationary time series using wavelet and EMD based ARMA models. Journal of Hydrology, 502, 103-119.
  25. Karthikeyan, L., Nagesh Kumar, D., Graillot, D., & Gaur, S. (2013). Prediction of ground water levels in the uplands of a tropical coastal riparian wetland using artificial neural networks. Water Resources Management, 27(3), 871-883.

Conferences

  1. Konkathi, P., & Lanka, K. (2021, December). Understanding the land-atmosphere causal relationships during vegetation response to drought stress. In AGU Fall Meeting 2021, AGU.
  2. Navale, A., & Lanka, K. (2021, December). Impact of land surface feedbacks on landfalling tropical cyclones. In AGU Fall Meeting Abstracts, (Vol. 2021, pp. A21E-03).
  3. Navale, A., & Lanka, K. (2021, December). Understanding the role of land-based evapotranspiration on Indian Summer Monsoon Rainfall. In AGU Fall Meeting Abstracts, (Vol. 2021, pp. H25L-1184).
  4. Konkathi, P., & Lanka, K. (2021, December). Error characterization of L-band passive microwave radiometry in soil moisture and VOD retrievals. In AGU Fall Meeting Abstracts, (Vol. 2021, pp. H15W-1310).
  5. Karthikeyan, L., & Mishra, A. K., (2019, September 24-27). Development of high resolution multi-layer soil moisture information. Water Future Conference, Bangalore.
  6. Karthikeyan, L., Pan, M., Nagesh Kumar, D., & Wood, E. F. (2018, December). Equifinality Adds Structural Uncertainties to Passive Microwave Soil Moisture Retrievals. In AGU Fall Meeting Abstracts, (Vol. 2018, pp. H51V-1620).
  7. Karthikeyan, L., Pan, M., Wanders, N., Nagesh Kumar, D., & Wood, E. F. (2017, December). Four Decades of Microwave Satellite Soil Moisture Observations: Product validation and inter-satellite comparisons. In 2017 AGU Fall Meeting, AGU.
  8. Karthikeyan, L., Pan, M., Konings, A., Piles, M., & Wood, E. (2017, April). Global Scale Simultaneous Retrieval of Smoothened Vegetation Optical Depth and Surface Roughness Parameter using AMSR-E X-band Observations. In EGU General Assembly Conference Abstracts, (p. 9553).
  9. Karthikeyan, L., & Nagesh Kumar, D. (2015, May 25-29) Validation of Satellite Soil Moisture Retrievals with Precipitation Data using Copula based Mutual Information Measure. 2nd SMOS Conference, ESA Madrid, Spain, 25-29 May, 2015, Abstracts 95167
  10. Karthikeyan, L., & Nagesh Kumar, D. (2014). Validation of Satellite Soil Moisture Retrievals using Precipitation Records in India. The International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, 40(8), 367.