Predictions of the global water cycle involve accurate atmospheric analyses and forecasts and a r... more Predictions of the global water cycle involve accurate atmospheric analyses and forecasts and a realistic representation of land surface processes for correctly timing water recirculation. A river routing mechanism is then needed to simulate rivers transport back into the oceans. Physical parameterizations of the ECMWF Integrated Forecast System (IFS) involved in the predictions of soil moisture and snow have been recently revised to address known shortcomings of the land surface scheme and a river routing scheme has been implemented. An improved representation of land water reservoirs is proven to be essential in global weather and climate prediction due both to partitioning of incoming solar radiation (e.g. via snow reflection/insulation, soil moisture/ice control on turbulent fluxes) and to timing of fresh water recirculation (e.g. evaporation, sublimation and runoff). The HTESSEL land surface scheme including a soil texture map and revised hydrological properties is verified tog...
Cold processes associated with snow cover strongly impact the quality of weather and climate pred... more Cold processes associated with snow cover strongly impact the quality of weather and climate prediction mainly due to the albedo and thermal insulation effects of the snowpack. The role of cold processes, associated with snow cover in controlling land-atmosphere interactions is assessed by performing climate simulations with the EC-EARTH model. A revised snow scheme was developed and tested in EC-EARTH. This improved the representation of the snowpack dynamics in the model and also near surface temperature simulations. The snow scheme was further developed to a multi-layer version that shows its potential in modeling thick snowpacks. A key process is the snow thermal insulation that leads to significant improvements of the surface water and energy balance components. A set of experiments with and without free snow evolution was carried out with EC-EARTH to assess the impact of interannual variability of snow cover on near surface and soil temperatures. It was found that snow cover i...
An increasing accuracy in the closure of the terrestrial water budget is a renewed focus of GEWEX... more An increasing accuracy in the closure of the terrestrial water budget is a renewed focus of GEWEX, GLASS panels and it is likely to remain a top priority in future years in order to be able to extract reliable trends and future scenarios for the Terrestrial Water Storage (TWS). Operational Numerical Weather Predictions and re-analysis projects (ERA-15, NCEP/NCAR, ERA-40, JRA)
ABSTRACT The WFDEI meteorological forcing dataset has been generated using the same methodology a... more ABSTRACT The WFDEI meteorological forcing dataset has been generated using the same methodology as the widely used WATCH Forcing Data (WFD) by making use of the ERA-Interim reanalysis data. We discuss the specifics of how changes in the reanalysis and processing have led to improvement over the WFD. We attribute improvements in precipitation and wind speed to the latest reanalysis basis data and improved downwards shortwave fluxes to the changes in the aerosol corrections. Covering 1979-2012 the WFDEI will allow more thorough comparisons of hydrological and Earth System model outputs with hydrologically- and phenologically-relevant satellite products than using the WFD.
... Carla Barroso. Instituto de Meteorologia, Lisbon, Portugal. ... Here we assess established al... more ... Carla Barroso. Instituto de Meteorologia, Lisbon, Portugal. ... Here we assess established algorithms and a newly developed scheme for the estimation of downward long-wave radiation flux at the surface (DLR), ie, the irradiance reaching the surface within 4 and 100 μm. ...
The objective of the present study was to assess the performance and recent improvements of the l... more The objective of the present study was to assess the performance and recent improvements of the land surface scheme used operationally in the European Centre for Medium-Range Weather Forecasts (ECMWF) in a Scandinavian boreal forest climate/ecosystem. The previous (the 1999 scheme of P. Viterbo and A. K. Betts) and the new (Tiled ECMWF Surface Scheme for Exchange Processes over Land,
... f , Nicolas Ghilain f , Joaquín Meliá e , Luis Pessanha a , Niilo Siljamo g &... more ... f , Nicolas Ghilain f , Joaquín Meliá e , Luis Pessanha a , Niilo Siljamo g & Alirio Arboleda f pages 2725-2744. ... (200642. Slingo, A., Ackerman, TP, Allan, RP, Kassianov, EI, McFarlane, SA, Robinson, GJ, Barnard, JC, Miller, MA, Harries, JE, Russell, JE and Dewitte, S. 2006. ...
Abstract The ECMWF land surface hydrology has been revised in the last 3 years in its soil and sn... more Abstract The ECMWF land surface hydrology has been revised in the last 3 years in its soil and snow hydrological components, leading to improvements in weather and seasonal predictions. It has been shown that efforts devoted to the improvement of land surface processes can lead to a more accurate representation of the global water cycle on monthly timescales. In this paper, we analyse the impact of land hydrology revisions at daily timescales on both atmospheric near-surface quantities and river discharges by coupling ...
Predictions of the global water cycle involve accurate atmospheric analyses and forecasts and a r... more Predictions of the global water cycle involve accurate atmospheric analyses and forecasts and a realistic representation of land surface processes for correctly timing water recirculation. A river routing mechanism is then needed to simulate rivers transport back into the oceans. Physical parameterizations of the ECMWF Integrated Forecast System (IFS) involved in the predictions of soil moisture and snow have been recently revised to address known shortcomings of the land surface scheme and a river routing scheme has been implemented. An improved representation of land water reservoirs is proven to be essential in global weather and climate prediction due both to partitioning of incoming solar radiation (e.g. via snow reflection/insulation, soil moisture/ice control on turbulent fluxes) and to timing of fresh water recirculation (e.g. evaporation, sublimation and runoff). The HTESSEL land surface scheme including a soil texture map and revised hydrological properties is verified tog...
Cold processes associated with snow cover strongly impact the quality of weather and climate pred... more Cold processes associated with snow cover strongly impact the quality of weather and climate prediction mainly due to the albedo and thermal insulation effects of the snowpack. The role of cold processes, associated with snow cover in controlling land-atmosphere interactions is assessed by performing climate simulations with the EC-EARTH model. A revised snow scheme was developed and tested in EC-EARTH. This improved the representation of the snowpack dynamics in the model and also near surface temperature simulations. The snow scheme was further developed to a multi-layer version that shows its potential in modeling thick snowpacks. A key process is the snow thermal insulation that leads to significant improvements of the surface water and energy balance components. A set of experiments with and without free snow evolution was carried out with EC-EARTH to assess the impact of interannual variability of snow cover on near surface and soil temperatures. It was found that snow cover i...
An increasing accuracy in the closure of the terrestrial water budget is a renewed focus of GEWEX... more An increasing accuracy in the closure of the terrestrial water budget is a renewed focus of GEWEX, GLASS panels and it is likely to remain a top priority in future years in order to be able to extract reliable trends and future scenarios for the Terrestrial Water Storage (TWS). Operational Numerical Weather Predictions and re-analysis projects (ERA-15, NCEP/NCAR, ERA-40, JRA)
ABSTRACT The WFDEI meteorological forcing dataset has been generated using the same methodology a... more ABSTRACT The WFDEI meteorological forcing dataset has been generated using the same methodology as the widely used WATCH Forcing Data (WFD) by making use of the ERA-Interim reanalysis data. We discuss the specifics of how changes in the reanalysis and processing have led to improvement over the WFD. We attribute improvements in precipitation and wind speed to the latest reanalysis basis data and improved downwards shortwave fluxes to the changes in the aerosol corrections. Covering 1979-2012 the WFDEI will allow more thorough comparisons of hydrological and Earth System model outputs with hydrologically- and phenologically-relevant satellite products than using the WFD.
... Carla Barroso. Instituto de Meteorologia, Lisbon, Portugal. ... Here we assess established al... more ... Carla Barroso. Instituto de Meteorologia, Lisbon, Portugal. ... Here we assess established algorithms and a newly developed scheme for the estimation of downward long-wave radiation flux at the surface (DLR), ie, the irradiance reaching the surface within 4 and 100 μm. ...
The objective of the present study was to assess the performance and recent improvements of the l... more The objective of the present study was to assess the performance and recent improvements of the land surface scheme used operationally in the European Centre for Medium-Range Weather Forecasts (ECMWF) in a Scandinavian boreal forest climate/ecosystem. The previous (the 1999 scheme of P. Viterbo and A. K. Betts) and the new (Tiled ECMWF Surface Scheme for Exchange Processes over Land,
... f , Nicolas Ghilain f , Joaquín Meliá e , Luis Pessanha a , Niilo Siljamo g &... more ... f , Nicolas Ghilain f , Joaquín Meliá e , Luis Pessanha a , Niilo Siljamo g & Alirio Arboleda f pages 2725-2744. ... (200642. Slingo, A., Ackerman, TP, Allan, RP, Kassianov, EI, McFarlane, SA, Robinson, GJ, Barnard, JC, Miller, MA, Harries, JE, Russell, JE and Dewitte, S. 2006. ...
Abstract The ECMWF land surface hydrology has been revised in the last 3 years in its soil and sn... more Abstract The ECMWF land surface hydrology has been revised in the last 3 years in its soil and snow hydrological components, leading to improvements in weather and seasonal predictions. It has been shown that efforts devoted to the improvement of land surface processes can lead to a more accurate representation of the global water cycle on monthly timescales. In this paper, we analyse the impact of land hydrology revisions at daily timescales on both atmospheric near-surface quantities and river discharges by coupling ...
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