Modelling the Baltic Sea with FLake Towards llake_salt=.TRUE. Frederik Schenk, Burkhardt Rockel Sebastian Wagner, Eduardo Zorita 5th CLM-Community Assembly.

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Presentation transcript:

Modelling the Baltic Sea with FLake Towards llake_salt=.TRUE. Frederik Schenk, Burkhardt Rockel Sebastian Wagner, Eduardo Zorita 5th CLM-Community Assembly Freie Universität Berlin,

PAGE 2 Motivation Our Task:  CCLM paleoclimate simulation: 880 – 1990 AD  Europe with 0.44° (INTERDYNAMIK  PRIME)  NE-Europe with 0.25° (GKSS / BALTEX / ECOSUPPORT)  Forcing: MILLENIUM runs / ECHAM5  external forcing:  orbital + GHC + Volc. + solar + Δ land use  CLM paleo-routine: dito (Sebastian Wagner, GKSS)

PAGE 3 ECHAM T30 Orography Downscaling using SST:  Baltic Sea:  DJF: always too warm  i.e. no sea-ice  JJA: always too cold…  Ocean-coupling too time consuming for regional paleoclimate simulations…

PAGE 4 NE-European T2M since 7000 BP (Sebastian Wagner, Eduardo Zorita, GKSS) OETZIsimulations Ötzi

FLake instead of global SST for Baltic Sea CLM needs generally more independence from the driving model SST  WG Atmosphere-Ice-Ocean

PAGE 6 Modifications External fields:  option for Baltic Sea = fr_lake  bathymetry depth_lk  NEW: salinity salt_lk Physics/Code:  conversion of constants to 2D fields as F(salt_lk)  freezing point (tpl_T_f  freezing point (tpl_T_f)  temperature of max. density (tpl_T_r)  max. density (tpl_rho_w_r)

PAGE 7 T. Seifert, F. Tauber, B. Kayser: 2001: "A high resolution spherical grid topography of the Baltic Sea – 2nd edition", Baltic Sea Science Congress, Stockholm November 2001, Poster #147 DEPTH_LK Bathymetry: ~0.02° (2 km) added to updated lake data base by E. Kourzeneva FLake: limit 50 m

PAGE 8 Sea-Surface-Salinity SSS [kg/kg] MERSEA Baltic Sea - North Sea S/T climatology 1 Salinity in PSU [g/kg], 5 m as interfacial salinity horizontal resolution: 0.2° x 0.1° [vertical resolution: z_min: 5.0, z_max: vertical levels: 18, monthly climatology] Ocean Database 2001 (WOD01), NOAA global SSS with 1° x 1°, [24 vertical levels, mons.] 1 Janssen et al. (1999): A climatological data set for temperature and salinity for the Baltic Sea and the North Sea. Deutsche Hydrographische Zeitschrift, Supplement 9.

PAGE 9 New 2D-Fields Freezing point (Gill 1982): T of max. density (Neumann & Pierson 1966):

PAGE 10 New 2D-Fields The One Atmosphere International Equation of State for Seawater, UNESCO 1980 Max. density: Density of Standard Mean Ocean Water (SMOW):

First Test Results (a) Baltic Lake: fresh water vs. 7 PSU (b) validation with new 2D-fields 

PAGE 12 Can we neglect salinity?

PAGE 13 Sensitivity study CLM_4.8_clm11 (ERA40) with int2lm_1.10_clm5  settings according to „cold bias“ report for LF  no tests for domain applied yet (0.25°, dt = 120s)  Sensitivity experiment independent from bias  (1) bocean: llake =.FALSE.  (2) bflake: llake =.TRUE.  (3) bs7psu llake =.TRUE. using mean salinity  [(4) bslake llake =.TRUE. with new 2D-fields]

PAGE 14 Sea-Ice bflake bs7psu General issue: there is only H_ICE, no FR_ICE

PAGE 15 Quantification of „ice“ in CLM General issue: there is only H_ICE, no FR_ICE

Surface Temperature T_S [K]

PAGE 17 ΔT_S bs7psu – bocean Mean Mean over 1985/07 – 1990/08

PAGE 18 ΔT_S bs7psu – bflake Mean Mean over 1985/07 – 1990/08

PAGE 19 ΔT_S bs7psu – bocean ONDJFM ONDJFM over 1985/07 – 1990/08

PAGE 20 ΔT_S bs7psu – bflake ONDJFM ONDJFM over 1985/07 – 1990/08

Near-Surface Temperature T_2M [K]

PAGE 22 ΔT_2M bs7psu – bocean ONDJFM ONDJFM over 1985/07 – 1990/08

PAGE 23 ΔT_2M bs7psu – bocean AMJJAS AMJJAS over 1985/07 – 1990/08

PAGE 24 ΔT_2M bs7psu – bflake ONDJFM ONDJFM over 1985/07 – 1990/08

PAGE 25 ΔT_2M bs7psu – bflake AMJJAS AMJJAS over 1985/07 – 1990/08

PAGE 26 Outlook CLM_4.14_clmX with cold_start and llake_salt  better sea-ice, i.e. Western Baltic Sea due to SSS?  systematic tests for best settings  comparison with ECHAM5/CLM  CLM standard (global SST)  CLM FLake, CLM SLake Open Questions:  extended changes in FLake necessary for salinity?  i.e. strong stratification, vertical mixing, sea-ice…

To be continued… Looking forward to new WG AIO! Thank you!

PAGE 28 Atmosphere: ECHAM4 T30 (3.75° x 3.75°) 19 vertical layers Ocean: HOPE-G Horizontal Resolution 2,81° x 2,81° 20 vertical layers increased tropical resolution ECHAM4 Model

PAGE 29 ECHO-G Simulation T-30 Orographie Europa ECHAM4