TY - GEN
AU - Gianpaolo Balsamo
AU - R. Salgado
AU - Emanuel Dutra
AU - Souhail Boussetta
AU - Tim Stockdale
AU - M. Potes
AB - The impact of lakes in numerical weather prediction is investigated in a set of global simulations performed with the ECMWF Integrated Forecasting System (IFS). A Fresh shallow-water Lake model (FLake) is introduced allowing the coupling of both resolved and sub-grid lakes (those that occupy less than 50% of a grid-box) to the IFS atmospheric model. Global fields for the lake ancillary conditions (namely lake cover and lake depth), as well as initial conditions for the lake physical state, have been derived in order to initialize the forecast experiments. The procedure for initialising the lake variables is described and verified with particular emphasis on the importance of surface water temperature and freezing conditions. The response of short-range near surface temperature to the representation of lakes is examined in a set of forecast experiments covering one full year. It is shown that the impact of sub-grid lakes is beneficial, reducing forecast error over Northern territories of Canada and over Scandinavia particularly in spring and summer seasons. This is mainly attributed to the lake thermal effect, which delays the temperature response to seasonal radiation forcing.
BT - ECMWF Technical Memoranda
DA - 09/2011
DO - 10.21957/efm571
LA - eng
M1 - 648
N2 - The impact of lakes in numerical weather prediction is investigated in a set of global simulations performed with the ECMWF Integrated Forecasting System (IFS). A Fresh shallow-water Lake model (FLake) is introduced allowing the coupling of both resolved and sub-grid lakes (those that occupy less than 50% of a grid-box) to the IFS atmospheric model. Global fields for the lake ancillary conditions (namely lake cover and lake depth), as well as initial conditions for the lake physical state, have been derived in order to initialize the forecast experiments. The procedure for initialising the lake variables is described and verified with particular emphasis on the importance of surface water temperature and freezing conditions. The response of short-range near surface temperature to the representation of lakes is examined in a set of forecast experiments covering one full year. It is shown that the impact of sub-grid lakes is beneficial, reducing forecast error over Northern territories of Canada and over Scandinavia particularly in spring and summer seasons. This is mainly attributed to the lake thermal effect, which delays the temperature response to seasonal radiation forcing.
PB - ECMWF
PY - 2011
EP - 16
T2 - ECMWF Technical Memoranda
TI - On the contribution of lakes in predicting near-surface temperature in a global weather forecasting model
UR - https://www.ecmwf.int/node/7925
ER -