نتایج جستجو برای: echam5

تعداد نتایج: 249  

2007
K. M. Nissen K. Matthes U. Langematz

We introduce the improved Freie Universität Berlin (FUB) high-resolution radiation scheme FUBRad and compare it to the 4-band standard ECHAM5 SW radiation scheme of Fouquart and Bonnel (FB). Both schemes are validated against the detailed radiative transfer model libRadtran. FUBRad produces realistic heating rate variations during the solar cycle. The SW heating rate response with the FB scheme...

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2013
S. Dietrich M. Werner T. Spangehl G. Lohmann

In this study we investigate the impact of midand late Holocene orbital forcing and solar activity on variations of the oxygen isotopic composition in precipitation. The investigation is motivated by a recently published speleothem δ18O record from the well-monitored Bunker Cave in Germany. The record reveals some high variability on multicentennial to millennial scales that does not linearly c...

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2008
J. Steinkamp

The emission of nitric oxide (NO) by soils (SNOx) is an important source of oxides of nitrogen (NO x =NO+NO 2) in the troposphere, with estimates ranging from 4 to 21 Tg of nitrogen per year. Previous studies have examined the influence of SNOx on ozone (O 3) chemistry. We employ the ECHAM5/MESSy earth system model to go further in 5 the reaction chain and investigate the influence of SNOx on l...

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2005
JOHANN H. JUNGCLAUS HELMUTH HAAK MOJIB LATIF UWE MIKOLAJEWICZ

Analyses of a 500-yr control integration with the non-flux-adjusted coupled atmosphere–sea ice–ocean model ECHAM5/Max-Planck-Institute Ocean Model (MPI-OM) show pronounced multidecadal fluctuations of the Atlantic overturning circulation and the associated meridional heat transport. The period of the oscillations is about 70–80 yr. The low-frequency variability of the meridional overturning cir...

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2014
Florian Zabel Birgitta Putzenlechner Wolfram Mauser Juergen P. Kropp

Changing natural conditions determine the land's suitability for agriculture. The growing demand for food, feed, fiber and bioenergy increases pressure on land and causes trade-offs between different uses of land and ecosystem services. Accordingly, an inventory is required on the changing potentially suitable areas for agriculture under changing climate conditions. We applied a fuzzy logic app...

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Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Sarah R Shannon Antony J Payne Ian D Bartholomew Michiel R van den Broeke Tamsin L Edwards Xavier Fettweis Olivier Gagliardini Fabien Gillet-Chaulet Heiko Goelzer Matthew J Hoffman Philippe Huybrechts Douglas W F Mair Peter W Nienow Mauro Perego Stephen F Price C J P Paul Smeets Andrew J Sole Roderik S W van de Wal Thomas Zwinger

We assess the effect of enhanced basal sliding on the flow and mass budget of the Greenland ice sheet, using a newly developed parameterization of the relation between meltwater runoff and ice flow. A wide range of observations suggest that water generated by melt at the surface of the ice sheet reaches its bed by both fracture and drainage through moulins. Once at the bed, this water is likely...

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2008
R. Makkonen H. Korhonen K. E. J. Lehtinen A. Laaksonen

1 Department of Physics, University of Helsinki, FI-00014, Helsinki, Finland 2 Department of Physics, University of Kuopio, FI-70211, Kuopio, Finland 3 Max Planck Institute for Meteorology, D-20146, Hamburg, Germany 4 Finnish Meteorological Institute, FI-00101, Helsinki, Finland 5 Finnish Meteorological Institute, FI-70211, Kuopio, Finland 6 Institute of Atmospheric and Climate Science, ETH Zur...

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Journal: :Climate of the Past 2018

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Journal: :Atmospheric Chemistry and Physics 2022

Abstract. Aerosols influence the Earth's energy balance directly by modifying radiation transfer and indirectly altering cloud microphysics. Anthropogenic aerosol emissions dropped considerably when global COVID-19 pandemic resulted in severe restraints on mobility, production, public life spring 2020. We assess effects of these reduced direct indirect radiative forcing over Europe, excluding c...

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Journal: :Climate Dynamics 2021

Abstract This study investigates the role of convection–circulation coupling on simulated eastward propagation Madden–Julian Oscillation (MJO) over Maritime Continent (MC). Experiments are conducted with European Centre Hamburg Model Version 5 (ECHAM5) coupled one-column ocean model—Snow-Ice-Thermocline (SIT) and two different cumulus schemes, Nordeng-Tiedtke (E5SIT-Nord) Tiedtke (E5SIT-Tied). ...

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