Homogenous atmospheric observations, state and flux quantities of the past 75 years View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2013-2016

FUNDING AMOUNT

158130 EUR

ABSTRACT

The proposed project intends (i) to contribute to improved quality of global reanalyses by providing homogeneityadjustments for upper air data back to the 1930s and (ii) to draw on the improved quality when evaluating globalbudget quantities from reanalyses. Both aims are core goals of phase II of the World Climate Research Programme(WCRP) Global Energy andWater cycle Experiment (GEWEX). The results will also contribute to the goals of theGlobal Monitoring for Environment and Security (GMES) programme, a major initiative for building a Europeancapacity for Earth Observation. The homogenized radiosonde temperature products developed in the two precedingFWF projects have become the standard radiosonde temperature bias correction input for all major ongoingreanalyses (the ERA-Interim reanalysis, NASA'sModern Era Retrospective Re-Analysis (MERRA) and the newJapanese reanalysis (JRA-55). Yet it needs to be extended substantially backwards to before 1958 and also towardsnew parameters, most notably humidity in order to keep its world leading position. Within a still running FWFproject the technical framework for homogenization of these data has been set up but only the feasibility of theapproach could be demonstrated. A mature implementation that works for most of the early radiosonde records is,however, needed for reanalysis efforts planned in the near future, most notably within the EC framework projectERA-CLIM. This will be one major task of the proposed project. The improved observations should lead to improved reanalyses and these should lead to more reliable atmosphericenergy and moisture budgets as well. It is important to investigate the low frequency variability not only ofessential climate variables such as temperature but also of energy and moisture fluxes. Characteristic energy flowpatterns during strong excursions of the Southern Oscillation Index have been diagnosed recently in the satellite era(1979-). More homogeneous input data and improved data assimilation methods should yield more reliablediagnostics back as far as to the early 1940s, when a strong El Nino event was likely related to the extremenortheastern European winters during World War II. The uncertainty of these diagnosed fluxes and their variabilityneeds to be carefully assessed and reduced to be useful for validation of climate models. We expect the resultinghomogenized datasets to be used as in situ upper air input for future reanalyses and to be available via publicclimate data portals. The project would support the aims of ERA-CLIM (where the PI is project partner) and of anew EC framework project to be submitted in autumn 2012. The compatibility of the project aims withinternational research programs and close cooperation with leading research centres, most notably the EuropeanCentre for Medium-range Weather Forecasts (ECMWF) and the National Center for Atmospheric Research(NCAR) should ensure high scientific impact of the proposed work. More... »

URL

http://pf.fwf.ac.at/en/research-in-practice/project-finder/28888

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