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Improvement of simulated monsoon precipitation over South-Asia with a regionally
coupled model REMO-MPIOM
Pankaj Kumarª, Dmitry Sein², William Cabos³, Daniela Jacobª
ª : Climate Service Center 2.0, Germany ² : Alfred Wegener Institute, Germany ³ : University of Alcalà, Spain
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected]
Motivation
Regional coupled model setup
Experiment design
Results
Conclusion
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Motivation
Sources Google images
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected]
Monsoon season JJAS is the most important climatic feature over South-Asia, contributing ca. 70-90% annual rainfall. One of the most complicated phenomenon to be simulate by climate models. A regional coupled atmosphere–ocean model is developed to study the monsoon climate over the CORDEX South Asia domain.
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Experiment Setup
Figure : Grid configuration: the red “rectangle” indicates the coupled domain (REMO model) black lines indicate the grid of the MPIOM/HAMOCC. For the ocean/sea ice grid only every 15th line is shown.
• The REgional atmosphere MOdel REMO with 50km horizontal resolution is coupled to the MPI global ocean – sea ice model MPIOM with increased resolution over the Indian Ocean (up to 20 km).
• The CORDEX south Asia domain is taken as atmospheric model domain (Fig.-1).
• The models are coupled via the OASIS coupler. • The global Hydrological Discharge model HD, which
calculates river runoff (0.5º horizontal grid resolution), is coupled to both the atmosphere and ocean components.
• Hereafter this coupled system will be called as ROM. • Exchange of fields between ocean and atmosphere takes
place every three hours. • Lateral atmospheric and upper oceanic boundary conditions
outside the REMO domain were prescribed using ERA40 reanalysis for the two hindcast simulations as well as with MPI-ESM-LR two historical run
• The total simulation period is 1958-2001.
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected]
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REMO/ROM CORDEX SA simulation table
RCM Forcing REMO (UnCoupled)
ROM (Coupled: REMO-MPIOM)
Period
ERA Interim √ - 1989-2008 ERA40 √ √ 1958-2001 MPI-ESM_Hist. √ √ 1958-2005 MPI-ESM_rcp26 √ - 2006-2100 MPI-ESM_rcp45 √ - 2006-2100 MPI-ESM_rcp85 √ - 2006-2100 EcEarth_Hist. √ - 1958-2005 EcEarth_rcp26 Under preparation - - EcEarth_rcp45 ,, - - EcEarth_rcp85 ,, - -
Note: REMO CORDEX South-Asia simulation with MPI-ESM data is ready and some data is already uploaded on the ESGF node. Rest of the ready data is likely to be uploaded by the end of next month.
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected]
Annual, Precipitation (mm/d) 1989-2001, coupled & uncoupled Much better resolve local and large scale precip. structure in ROM
Results
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected]
Annual Precipitation magnitude difference (mm/d), coupled - uncoupled
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected]
WMO CCL TECO 2014, Heidelberg, Germany 30June-2July 2014 contact: [email protected] 8
Conclusion
Within CORDEX framework over South-Asia domain a set of four long regional coupled/uncoupled climate simulations are performed for monsoon studies.
Regional coupled model (ROM) showed substantial improvement over South-Asia for monsoon precipitation climatology, both over land and ocean. Especially over Indonesian region, Bangladesh, plains of northern India, etc.
Indian ocean precipitation is mainly improved due to cooler SST in ROM
Much higher resolved Indian ocean (20-30km) lead’s to locally better resolved SST and precipitation patterns
Preliminary analysis is presented here, next step is to explore more on intraseasonal variability
Thank you for your attention!