Author:
Krakauer N. Y.,Cook B. I.,Puma M. J.
Abstract
Abstract. While a variety of model experiments and analyses of observations have explored the impact of soil moisture variation on climate, it is not yet clear how large or detectable soil moisture feedback is across spatial and temporal scales. Here, we study the impact of dynamic versus climatological soil moisture in the GISS GCM ModelE (with prescribed sea-surface temperatures) on the variance and on the spatial and temporal correlation scale of hydrologically relevant climate variables (evaporation, precipitation, temperature, cloud cover) over the land surface. We also confirm that synoptic variations in soil moisture have a substantial impact on the mean climate state, because of the nonlinearity of the dependence of evapotranspiration on soil moisture. We find that including dynamic soil moisture increases the interannual variability of seasonal (summer and fall) and annual temperature, precipitation, and cloudiness. Dynamic soil moisture tends to decrease the correlation length scale of seasonal (warm-season) to annual land temperature fluctuations and increase that of precipitation. Dynamic soil moisture increases the persistence of temperature anomalies from spring to summer and from summer to fall, and makes the correlation between land precipitation and temperature fluctuations substantially more negative. Global observation sets that allow determination of the spacetime correlation of variables such as temperature, precipitation, and cloud cover could provide empirical measures of the strength of soil moisture feedback, given that the feedback strength varies widely among models.
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
Reference57 articles.
1. Abbot, D. S. and Emanuel, K. A.: A tropical and subtropical land–sea–atmosphere drought oscillation mechanism, J. Atmos. Sci., 64, 4458–4468, 2007.
2. Abramopoulos, F., Rosenzweig, C., and Choudhury, B.: Improved ground hydrology calculations for global climate models (GCMs): soil water movement and evapotranspiration, J. Climate, 1, 921–941, https://doi.org/10.1175/1520-0442(1988)0012.0.CO;2, 1988.
3. Aleinov, I. and Schmidt, G.: Water isotopes in the GISS ModelE land surface scheme, Global Planet., 51, 108–120, https://doi.org/10.1016/j.gloplacha.2005.12.010, 2006.
4. Baudena, M., D'Andrea, F., and Provenzale, A.: A model for soil-vegetation-atmosphere interactions in water-limited ecosystems, Water Resour. Res., 44, W12429, https://doi.org/10.1029/2008WR007172, 2008.
5. Borchert, R.: Soil and stem water storage determine phenology and distribution of tropical dry forest trees, Ecology, 75, 1437–1449, 1994.
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