A Soil Moisture–Rainfall Feedback Mechanism: 2. Numerical experiments

A Soil Moisture–Rainfall Feedback Mechanism: 2. Numerical experiments Here we develop a numerical model to investigate the hypothesis proposed by a companion paper (Eltahir, this issue), which describes a soil moisture–rainfall feedback mechanism. The model is designed to describe the seasonal evolution of the West African monsoon rainfall and is used to perform numerical experiments that elucidate the mechanisms of the response of rainfall to soil moisture anomalies. A significant rainfall anomaly is simulated by the model in response to a hypothetical soil moisture anomaly that has been imposed during early summer. However, the magnitude of this anomaly almost vanishes when the net radiation at the surface is not allowed to respond to the soil moisture anomaly. Hence the results of the numerical experiments support the proposed hypothesis and highlight the crucial importance of the radiative and dynamical feedbacks in regulating the rainfall anomalies that result from the soil moisture anomalies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

A Soil Moisture–Rainfall Feedback Mechanism: 2. Numerical experiments

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Publisher
Wiley
Copyright
Copyright © 1998 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
D.O.I.
10.1029/97WR03497
Publisher site
See Article on Publisher Site

Abstract

Here we develop a numerical model to investigate the hypothesis proposed by a companion paper (Eltahir, this issue), which describes a soil moisture–rainfall feedback mechanism. The model is designed to describe the seasonal evolution of the West African monsoon rainfall and is used to perform numerical experiments that elucidate the mechanisms of the response of rainfall to soil moisture anomalies. A significant rainfall anomaly is simulated by the model in response to a hypothetical soil moisture anomaly that has been imposed during early summer. However, the magnitude of this anomaly almost vanishes when the net radiation at the surface is not allowed to respond to the soil moisture anomaly. Hence the results of the numerical experiments support the proposed hypothesis and highlight the crucial importance of the radiative and dynamical feedbacks in regulating the rainfall anomalies that result from the soil moisture anomalies.

Journal

Water Resources ResearchWiley

Published: Apr 1, 1998

References

  • Impacts on regional climate of Amazon deforestation
    Dickinson, Dickinson; Kennedy, Kennedy
  • The Delta‐Eddington approximation for radiative flux transfer
    Joseph, Joseph; Wiscombe, Wiscombe; Weinman, Weinman
  • Nonlinear dynamics of soil moisture at climate scales, 1, Stochastic analysis
    Rodriguez‐Iturbe, Rodriguez‐Iturbe; Entekhabi, Entekhabi; Bras, Bras
  • New definitions for moisture recycling and the relationship with land‐use changes in the Sahel
    Savenije, Savenije
  • The role of vegetation in the dynamics of West African monsoons
    Zheng, Zheng; Eltahir, Eltahir

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