Marginal ice zone drift prediction model

A Langrangian free drift model is developed, including a term for geostrophic currents that reproduces the 13 h period signature in the ice motion observed in the data (CLSC_WIIOS_2017; parent data). The calibrated model is shown to provide accurate predictions of the ice drift for up to 2 days, and the calibrated parameters provide estimates of wind and ocean drag for pancake floes under storm conditions.

Model setup is described in "Drift of pancake ice floes in the winter Antarctic marginal ice zone during polar cyclones", Alberello et. al [ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JC015418; pre-print https://arxiv.org/pdf/1906.10839.pdf].

The dataset includes model data.

Six model outputs are included.

(i) "full_t00" includes the full 10 days simulation, with all the forcing switched on

(ii) "noge_t00" includes the full 10 days simulation, but the geostrophic current is suppressed

(iii) "full_t25_noup" includes the simulation with start at 2.5 days, all the forcing switched on, no update of the drag coefficients

(iv) "full_t25_newn" includes the simulation with start at 2.5 days, all the forcing switched on, the drag coefficients are recalibrated

(v) "full_t50_noup" includes the simulation with start at 5 days, all the forcing switched on, no update of the drag coefficients

(vi) "full_t50_newn" includes the simulation with start at 5 days, all the forcing switched on, the drag coefficients are recalibrated

In each file:

- rho_a the air density (1.3 kg/m3)

- rho_w the water density (1028 kg/m3)

- rho_i the ice density (910kg/m3)

- C_w the water drag coefficient (calibrated)

- C_a the air drag coefficient (calibrated)

- turn the turning angle (25 degrees)

- Nansen the Nansen number evaluated using C_a and C_w

- aalpha a model parameter (proportional to air and ice parameters)

- abeta a model parameter (proportional to water and ice parameters)

- ag amplitude of the geostrophic current (U_g=0.125m/s)

- tg initial phase of the geostrophic current (in radians)

- to start time (in matlab format, use "datestr(to)" ), after which model resolution is 60 seconds

- wo components of wind in the East and North direction (m/s)

- wi components of wind in the East and North direction (m/s)

- uo components of modelled ice drift speed in the East and North direction (m/s)

- lo longitude and latitude of modelled ice position (degrees)

- xo position of modelled ice in the East and North direction (m), given with respect to the initial position (0,0)

- wco components in the East and North direction of geostrophic current (m/s)

Identification info

Alternate title: Marginal ice zone drift prediction model

Date (Publication): 2020-04-01

Edition: 1

Citation identifier

Dataset DOI

Title: Information and documentation - Digital object identifier system

Date (Publication): 2012-04-23

Citation identifier: ISO 26324:2012

Citation identifier: doi:10.26179/5e3b98478d0c3

Originator

Alberello, A., Bennetts, L. and Toffoli, A.

Publisher

Australian Antarctic Data Centre

Principal investigator

ALBERELLO, ALBERTO

University of Adelaide

Adelaide

South Australia

5005

Australia

Principal investigator

BENNETTS, LUKE

School of Mathematical Sciences

University of Adelaide

Adelaide

5005

Australia

Principal investigator

TOFFOLI, ALESSANDRO

Department of Infrastructure

University of Melbourne

Melbourne

VIC

Australia

Collaborator

ALBERELLO, ALBERTO

University of Adelaide

Adelaide

South Australia

5005

Australia

Name: CAASM Metadata

Website: https://data.aad.gov.au/metadata/records/AAS_4434_MIZ_DRIFT_MODEL

Purpose: Modelling sea ice drift based on dedicated field observations

Status: Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Temporal resolution: PT60S

Topic category

Oceans

Extent

Description: Temporal Coverage

Temporal extent

TimePeriod: 2017-07-04 2017-07-15

Title: Drift of pancake ice floes in the winter Antarctic marginal ice zone during polar cyclones.

Date (Publication): 2020

Citation identifier: 125

Citation identifier: https://doi.org/10.1029/2019JC015418