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| Titel |
Phenology experiments in a regional climate model |
| VerfasserIn |
R. Lorenz, E. L. Davin, D. M. Lawrence, S. I. Seneviratne |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068865
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| Zusammenfassung |
| European summer climate, especially extreme events such as heat waves and droughts, is
strongly impacted by processes acting at the interface between the land surface and the
atmosphere (e.g. Seneviratne et al. 2010). In particular phenological processes associated
with vegetation may play an important role, since plants’ transpiration is the largest
contributor to evapotranspiration in many regions. However, the influence of vegetation
phenology on climate is largely unknown and the relative importance of phenology versus
other processes like SM dynamics has yet to be quantified.
We perform several experiments with a regional climate model to study the role of
vegetation-atmosphere feedbacks for European summer climate. The applied regional climate
model is the newly developed coupled biosphere-atmosphere model COSMO-CLM2 (Davin
et al. 2011). This model allows for a comprehensive representation of vegetation-climate
interactions at the regional scale thanks to the inclusion of plant physiological processes and
it also entails a detailed soil hydrological module.
In the control run phenology is described by a seasonal cycle of monthly leaf area index
based on MODIS data (Lawrence and Chase, 2007). The set of experiments includes 4
experiments: (1) an experiment investigating the impact of using a daily seasonal cycle, (2) an
experiment simulating very late spring and low vegetation activity, (3) an experiment
simulating very early spring and high vegetation activity, and (4) an experiment investigating
inter-annual varying phenology based on daily data. A global reanalysis of vegetation
phenology (Stöckli et al. 2011) is used to prescribe realistic or extreme phenological
conditions.
Based on these model experiments and earlier performed soil moisture experiments we
investigate soil moisture- versus phenology-climate interactions. In particular, we study the
impacts of phenology on climate, especially heat waves and droughts.
References:
Davin, E.L, R. Stöckli, E.B. Jaeger, S. Levis, and S.I. Seneviratne (2011), COSMO-CLM2: a
new version of the COSMO-CLM model coupled to the Community Land Model. Climate
Dynamics, 37, 1889–1907, doi: 10.1007/s00382-011-1019-z.
Lawrence, P. J., and T. N. Chase (2007), Representing a new MODIS consistent land
surface in the Community Land Model (CLM 3.0), J. Geophys. Res., 112, G01023,
doi:10.1029/2006JG000168.
Seneviratne, S.I., T. Corti, E.L. Davin, M. Hirschi, E.B. Jaeger, I. Lehner, B.
Orlowsky, and A.J. Teuling (2010), Investigating soil moisture-climate interactions in a
changing climate: A review. Earth-Science Reviews, 99, 3–4, 125–161, doi:10.1016/
j.earscirev.2010.02.004.
Stöckli, R., T. Rutishauser, I. Baker, M. A. Liniger, and A. S. Denning, (2011), A Global
Reanalysis of Vegetation Phenology, J. Geophys. Res., 116, G03020, doi:10.1029/
2010JG001545. |
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