Modeling the characteristics of the earth surface in the Arctic - - PowerPoint PPT Presentation

Modeling the characteristics of the earth surface in the Arctic using the regional model WRF and dynamic-thermodynamic model of sea ice cover

Byichkova¹ V.I., Rubinstein¹ K.G, Makshtas² A.P., Ignatov¹ R.Y. 1 - Hydrometcentre of Russia, 2 - Institute of Arctic and Antarctic

Purposes of work:

• To adapt the mesoscale meteorological model WRF to conditions of the
• bservation polar region, based on a unique data archive of the annual cycle of
• bservations in free atmosphere, the boundary layers of the atmosphere and
• cean snow and ice cover, performed in 2007-2008 on the drifting stations “North

Pole - 35“ and “North Pole – 36”

• Тo perform validation thermodynamic and dynamic-thermodynamic models
• f sea ice cover for the Arctic Basin.

Surface temperature Ozonometer М-124 Spectrometer Ramses Inlets for analyzers of CO2 and O3 Radiosoundings Incoming and outgoing short and longwave radiation Wind direction Air temperature and humidity sensors Visibility Wind velocity Meteo station MAWS110 Balloon soundings

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

2

⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ∂ ∂ ∂ ∂ = z u z g Ri

r

θ θ

Richardson number

The variant with parameterization of radiation RRTMG, turbulence - Moninu-Obuhovu-Janichu scheme, boundary layer – Buzho-Lokareru scheme has appeared the best.

• 60
• 50
• 40
• 30
• 20
• 10

10 20 30 1 2 3 5 6 8 9 11 12 13 15 16 18 19 20 22 23 25 26 28 29 30 HFX (N) HFX

Heat flux

) ) ( (ln ) (ln ) (

1 2 3 1 2 2 8 * 1 2 2 2 1 2 *

L z z Fr C C L z z C z z L z z z z z z N a U U

N

• u

u

− + − + Δ = − + − + Δ = θ χ θ β χ χ

5000000 10000000 15000000 20000000 25000000 30000000 35000000 40000000 45000000 1 jan 1 feb 1 mar 1 apr 1 mai 1 jun 1jul 1 aug 1 sep 1 оkt 1 nov 1 dec Water to 30% of ice to 60% of ice to 90% of ice Ice

Ice cohesion changing during 2007 year by 2 models AARI (continuous line) and NCAR (dashed line)

We used the dynamic-thermodynamic model of sea ice cover (Institute of Arctic and Antarctic). The model calculates the spatial and temporal characteristics of snow and ice, the turbulent fluxes, sensible and latent heat, short-and long-wave radiation balance. The computational domain is 50x50 km, centered at the North Pole. We used the following output fields: the average cohesion of ice (with areal weights of level ice and ice ridges) and a sign of the cell (water or ice).

Difference of ice cohesion between AARI and NCAR 1.06.2007 and 31.12.2007

Thank you for attention. Waiting for the question near the poster.