Publications

Impact of northern Eurasian snow cover in autumn on the warm Arctic - cold Eurasia pattern during the following January and its linkage to stationary planetary waves.

Xu, X.; He, S.; Li, F.; Wang, H.

Impact of NOx emissions from subsonic aircraft: Inclusion of plume processes in a three-dimensional model covering Europe, North America, and the North Atlantic.

Kraabøl, A.-G.; Flatøy, F.; Stordal, F.

Impact of short-term measure on NO2-concentrations during high pollution episodes. NILU OR

Høiskar, B. A. K.; Sundvor, I.; Haug, T. W.; Sousa Santos, G.

NILU and Urbanet Analyse AS has been commissioned by The Norwegian Public Roads Administration to study the impact of short-term measures to decrease the NO2 concentrations during days with high air pollution.

Impact of snow cover and sea ice on sub-seasonal to seasonal predictions in the Arctic. NILU F

Orsolini, Y.

Impact of snow cover and sea ice on sub-seasonal to seasonal predictions in the Arctic.

Orsolini, Y.; Senan, R.; Balsamo, G.; Doblas-Reyes, F.; Vitart, F.; Weisheimer, A.

Impact of snow cover data assimilation over the Tibetan Plateau on medium range Numerical weather prediction

de Rosnay, P.; Balsamo, G.; Orsolini, Yvan; Dutra, E.; Liu, B.; Senan, R.; Wang, W.; Wegmann, Martin; Yang, K.; Zhu, C.

Impact of snow cover on inter-annual variability of the NH winter circulation in an ensemble GCM simulation forced by satellite observations.

Orsolini, Y.; Kvamstø, N.; Sorteberg, A.

Impact of snow initialisation in subseasonal-to-seasonal winter forecasts with the Norwegian Climate Prediction Model

Li, Fei; Orsolini, Yvan; Keenlyside, Noel; Shen, Mao-Lin; Wang, Yiguo; Counillon, Francois

Impact of snow initialization in coupled ocean-atmosphere seasonal forecasts. NILU F

Orsolini, Y.

Impact of snow initialization in subseasonal-to-seasonal winter forecasts with the Norwegian Climate Prediction Model

Li, Fei; Orsolini, Yvan; Keenlyside, Noel; Shen, Mao-Lin; Counillon, Francois; Wang, Yiguo

Snow initialization has been previously investigated as a potential source of predictability atthe subseasonal‐to‐seasonal (S2S) timescale in winter and spring, through its local radiative,thermodynamical, and hydrological feedbacks. However, previous studies were conducted with low‐topmodels over short periods only. Furthermore, the potential role of the land surface‐stratosphere connectionupon the S2S predictability had remained unclear. To this end, we have carried out twin 30‐memberensembles of 2‐month (November and December) retrospective forecasts over the period 1985–2016, witheither realistic or degraded snow initialization. A high‐top version of the Norwegian Climate PredictionModel is used, based on the Whole Atmosphere Community Climate Model, to insure improved couplingwith the stratosphere. In a composite difference of high versus low initial Eurasian snow, the surfacetemperature is strongly impacted by the presence of snow, and wave activityfluxes into the stratosphere areenhanced at a 1‐month lag, leading to a weakened polar vortex. Focusing further on 7 years characterized bya strongly negative phase of the Arctic Oscillation, wefind a weak snow feedback contributing to themaintenance of the negative Arctic Oscillation. By comparing the twin forecasts, we extracted the predictiveskill increment due to realistic snow initialization. The prediction of snow itself is greatly improved, andthere is increased skill in surface temperature over snow‐covered land in thefirst 10 days, and localized skillincrements in the mid‐latitude transition regions on the southernflanks of the snow‐covered land areas, atlead times longer than 30 days.

American Geophysical Union (AGU)

Impact of snow initialization on sub-seasonal forecasts.

Orsolini, Y.; Senan, R.; Carrasco, A.; Balsamo, G.; Doblas-Reyes, P.; Vitart, F.; Weisheimer, A.; Benestad, R.

Impact of snow initialization on sub-seasonal forecasts.

Orsolini, Y.J.; Senan, R.; Balsamo, G.; Doblas-Reyes, F.J.; Vitart, F.; Weisheimer, A.; Carrasco, A.; Benestad, R.E.

Impact of snow initialization on subseasonal forecasts. NILU F

Orsolini, Y.