Regional modeling in the Arctic region

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Regional modeling in the Arctic region

Message  raut le Mar 14 Mai - 16:50

Improved understanding of climate change in the Arctic requires better quantitative understanding of the coupled atmosphere-ice-ocean system, including interactions between mid- and high-latitudes (e.g. pollution import into the Arctic troposphere). Whilst fully coupled climate models are the ideal tools for examining climate feedbacks, there are still many limitations in our knowledge at the process level requiring a combination of data collection, data analysis and high resolution regional modelling. For example, high-resolution simulations of atmospheric dynamics are better able to simulate surface winds significantly affecting predictions of ocean mixing layer depths (e.g. DuVivier and Cassano, MWR, in press). Synoptic events also impact sea-ice breakup (see event in August 2012 at http://www.nasa.gov/topics/earth/features/2012-seaicemin.html). It is suggested that discrepancies between observed and simulated of sea-ice extent (see Overland and Wang, 2013) may be due, in part, to poor representation of clouds and aerosols in climate models. The presence of clouds and aerosols in the Artic troposphere also strongly control the heat surface budget, thus affecting the evolution of the Arctic boundary layer (Hines et al., 2011). Observations show a high degree of fine-scale vertical layering which is not captured in current global models and which can have a significant impact on calculation of radiative budgets. High-resolution model runs (e.g. 2-20km horizontal), evaluated against observations, are required to improve representation of Arctic atmospheric processes, including treatments of atmospheric chemistry and aerosols. Mesoscale model simulations will be used to improve the representation of aerosol and cloud processes covering a variety of spatial and temporal scales and to determine the extent to which measurements can provide retrievals of aerosols, clouds, precipitation and radiative heating in the Arctic.



Jean-Christophe Raut, Jennie Thomas, Kathy Law (LATMOS)


raut

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Date d'inscription : 04/05/2013

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