Joint DEnKF-albedo assimilation scheme that considers the common land model subgrid heterogeneity and a snow density-based observation operator for improving snow depth simulations

Jianhui Xu; Feifei Zhang; Yi Zhao; Hong Shu; Kaiwen Zhong

doi:10.1117/1.JRS.10.036001

4 July 2016 Joint DEnKF-albedo assimilation scheme that considers the common land model subgrid heterogeneity and a snow density-based observation operator for improving snow depth simulations

Jianhui Xu, Feifei Zhang, Yi Zhao, Hong Shu, Kaiwen Zhong

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 10, Issue 3, 036001 (July 2016). https://doi.org/10.1117/1.JRS.10.036001

Abstract

For the large-area snow depth (SD) data sets with high spatial resolution in the Altay region of Northern Xinjiang, China, we present a deterministic ensemble Kalman filter (DEnKF)-albedo assimilation scheme that considers the common land model (CoLM) subgrid heterogeneity. In the albedo assimilation of DEnKF-albedo, the assimilated albedos over each subgrid tile are estimated with the MCD43C1 bidirectional reflectance distribution function (BRDF) parameters product and CoLM calculated solar zenith angle. The BRDF parameters are hypothesized to be consistent over all subgrid tiles within a specified grid. In the SCF assimilation of DEnKF-albedo, a DEnKF combining a snow density-based observation operator considers the effects of the CoLM subgrid heterogeneity and is employed to assimilate MODIS SCF to update SD states over all subgrid tiles. The MODIS SCF over a grid is compared with the area-weighted sum of model predicted SCF over all the subgrid tiles within the grid. The results are validated with in situ SD measurements and AMSR-E product. Compared with the simulations, the DEnKF-albedo scheme can reduce errors of SD simulations and accurately simulate the seasonal variability of SD. Furthermore, it can improve simulations of SD spatiotemporal distribution in the Altay region, which is more accurate and shows more detail than the AMSR-E product.

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Jianhui Xu, Feifei Zhang, Yi Zhao, Hong Shu, and Kaiwen Zhong "Joint DEnKF-albedo assimilation scheme that considers the common land model subgrid heterogeneity and a snow density-based observation operator for improving snow depth simulations," Journal of Applied Remote Sensing 10(3), 036001 (4 July 2016). https://doi.org/10.1117/1.JRS.10.036001

Published: 4 July 2016

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