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Enhancements to the Offline Noah Land Model: 1948-2006 Retrospective Analysis

This study revisits the Offline Noah Land Model for the years 1948-2006, correcting errors in the vegetation class table and implementing several model improvements. Notably, the input precipitation datasets have been enhanced for uniformity in both retrospective and real-time analyses. A retrospective analysis covering 1948-1998 illustrates improved simulated soil moisture anomalies in the top two model layers, while evaluating phases of annual cycles. Changes in evaporation and runoff patterns across various U.S. regions were also observed, fostering better climate modeling accuracy.

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Enhancements to the Offline Noah Land Model: 1948-2006 Retrospective Analysis

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  1. Rerun of the Offline Noah Land Model for 1948-2006 Yun Fan and Huug van den Dool • Error in the vegetation class table corrected. • Several changes/improvements in the model. • Improvement in input precipitation datasets, homogeneous input for both retrospective and real-time analysis. • Retropsective analysis done for 1948 - 1998.

  2. NLDAS Re-run

  3. New Old

  4. New Black - P Green - E Blue - R Red - dw/dt Old

  5. Summary NLDAS offline run with bug fix in vegetation map:1. Simulated soil moisture anomalies and annual cycles are Improved in top two model layers (0-10cm, 10-40cm), but phases of the dry end of annual cycles are about 1~2 month late. 2. Simulated soil moisture anomalies in 3rd and 4th layers (40-100cm & 100-200cm) are comparable with old run, but the amplitudes of annual cycles are much larger than Obs (also old run).3. Slightly changes in evaporation and runoff are found in northwestern and northeastern US. About 10~20 mm/mon increase in evaporation and similar amount decrease in runoff are seen in southeastern US.

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