GPC Exeter forecast for winter Crown copyright Met Office
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1 GPC Exeter forecast for winter
2 Global Seasonal Forecast System version 5 (GloSea5) ensemble prediction system the source for Met Office monthly and seasonal forecasts uses a coupled model (atmosphere landsurface ocean sea-ice) regular updates linked to model development cycle (~ yearly) hindcasts computed in near-real time
3 GloSea5 operational system Model version: HadGEM3 GC2.0 (UM / NEMO / CICE / OASIS) Resolution: Forecast length: 7 months (seasonal), 2 months (subseasonal) N216L85 O0.25L75 (mid-lat: ~60 km atm.) Hindcast period: (14 years) Model uncertainties represented by stochastic physics Initial conditions uncertainties represented by a lagged ensemble
4 Initialisation of the system Forecast Atmosphere (initialised & land daily): - Ocean & sea-ice: NEMOVAR surf *: Met (3d-Var Office NWP joint system analysis for (4d-Var) med-range, monthly and seasonal) ocean, 14-year Atmosphere hindcast & land ( ): Ocean & sea-ice: NEMOVAR surf *: ERA-interim - Fixed 3 members start dates per start of 1 date st, 9 th, 17 th, 25 th of each month * Soil moisture set to climatological average
5 A day in the life of GloSea5 Seasonal 2 x forecasts ~210 days Sub-seasonal 2 x forecasts ~60 days 6 x Seasonal hindcasts ~210 days
6 Skill of forecasting system ENSO high correlations of ensemble mean forecasts and observations much improved westward extension good representation of teleconnections NAO West Pacific Subtropical High rainfall over Yangtze river catchment tropical storm numbers and ACE (especially N Atlantic, W Pacific, Australia); landfall frequency in Caribbean
7 Sources of predictability ENSO (seasonal) QBO (seasonal) ATLANTIC SST (seasonal) SEA ICE (interannual) SNOW (seasonal) VOLCANOES (interannual) not expected to contribute this year SOLAR (interannual) not expected to contribute this year
8 Sources of predictability ENSO (seasonal) strong El Niño positive NAO early winter, high chance of SSW late winter observations, models QBO (seasonal) westerly phase positive NAO early winter observations, models (to a certain extent) ATLANTIC SST (seasonal) tripole in May SST DJF NAO observations, models SEA ICE (interannual) low September sea-ice negative DJF NAO observations, models ; not yet well established SNOW (seasonal) Eurasian snow cover or advance of snow in October negative correlation with AO; observations (no consensus), not in models
9 ENSO forecasts Nov 2015 Apr 2016 Nino 3.4 GloSea5 (26 Oct-15 Nov) Euro-SIP
10 Stratosphere 60N Mean 10 hpa Zonal Wind Anomalies Initial cond: 3-16 Nov
11 Stratosphere 60N Mean zonal wind anomalies Monthly Initial cond: Nov Seasonal
12 Summary sources of predictability ENSO strong El Niño positive NAO early winter, increased risk of SSW late winter QBO westerly phase positive NAO early winter
13 December-January-February Forecast GloSea5 initialised around early November
14 Ensemble mean PMSL DJF GloSea 5 ( ) Initial conditions: 1 Nov ECMWF ( ) Initial conditions: 26 Oct-15 Nov 40 members Met France ( ) NCEP ( ) KMA ( ) Initial conditions: 1 Nov Initial conditions: 26 Oct-5 Nov Initial conditions: 26 Oct-15 Nov (37 members)
15 Upper Troposphere (200hPa) Circulation Anomalies DJF GloSea5 Contours: streamfunction grey = cyclonic; black = anticyclonic; zonal mean removed; units = km 2 s -1 Colours: velocity potential (divergent winds are gradient of vp) ECMWF Meteo-France Divergence km 2 s -1 Convergence
16 Upper Troposphere (200hPa) Circulation Anomalies DJF GloSea5 Contours: streamfunction grey = cyclonic; black = anticyclonic; zonal mean removed; units = km 2 s -1 Colours: Rossby wave source = Rate of change of vorticity due to divergence and divergent wind ECMWF Meteo-France decreasing vorticity <= increasing vorticity (10-11 s -2 )
17 Upper Troposphere (200hPa) Circulation Anomalies JFM GloSea5 Contours: streamfunction grey = cyclonic; black = anticyclonic; zonal mean removed; units = km 2 s -1 Colours: velocity potential (divergent winds are gradient of vp) ECMWF Meteo-France Divergence km 2 s -1 Convergence
18 Upper Troposphere (200hPa) Circulation Anomalies JFM GloSea5 Contours: streamfunction grey = cyclonic; black = anticyclonic; zonal mean removed; units = km 2 s -1 Colours: Rossby wave source = Rate of change of vorticity due to divergence and divergent wind ECMWF Meteo-France decreasing vorticity <= increasing vorticity (10-11 s -2 )
19 PMSL anom by month GloSea 5 ECMWF Met France Dec Jan Feb
20 Multi-Model DJF 2m temperature tercile probabilities Above GloSea 5 ECMWF Meteo France NCEP climate climate climate climate Below
21 Multi-Model DJF Precipitation tercile probabilities Above GloSea 5 ECMWF Meteo France NCEP climate climate climate climate Below
22 Summary There is currently a strong signal, consistent across models, for positive NAO in early winter. This is consistent with the known drivers (see below). In late winter, there is a heightened risk of sudden stratospheric warming but with a large uncertainty in the timing of the impact. Expected influences this year: strong El Niño strong influence from the stratosphere (QBO)
23 The end
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