Opened 4 months ago

Last modified 3 months ago

#1900 new Enhancement

Considering ocean column properties in NEMO-ICB module

Reported by: Nacho Merino Owned by: Gurvan Madec
Priority: minor Milestone: 2015 nemo_v3_6_STABLE
Component: OPA Version: nemo_v3_6_STABLE
Keywords: NEMO ICB Cc:

Description

Proposed modifications consists in considering the ocean column properties in the dynamics and thermodynamics parametrizations of the NEMO-ICB module:
1- In the computation of the ocean drag term for the iceberg dynamics equation we propose the use of the depth-integrated ocean velocity as described in equation 2.1 of Merino et al 2016, instead of considering the ocean surface velocity. In the situation where the submerged part of an iceberg is greater than the ocean bathymetry, the integrated velocity considers zero velocity for the part of the iceberg which is deeper than the ocean bathymetry. This parametrization has the effect of reducing the iceberg velocity when icebergs transit through shallow regions of the ocean. We have chosen not to stop or stuck icebergs in such situation since this has a strong impact in the iceberg distribution and it would require a representation of subgrid bathymetry. 
2- For the computation of the basal turbulence melt rate term, we propose to consider the ocean temperature at the iceberg depth (equation 2.2 in Merino et al 2016) instead of the sea surface temperature. In cases where the submerged part of the iceberg is greater than the ocean bathymetry we propose to consider the ocean temperature at the ocean bathymetry depth. 
3- For the buoyant convection term, we propose to integrate this term along the submerged part of the iceberg (equation 2.3 of Merino et al 2016), instead of only consider the ocean surface temperature. In cases where the submerged part of the iceberg is greater than the ocean bathymetry, the ocean temperature considered in the integral for the part of the iceberg which is found deeper than the ocean bathymetry (no temperature is defined deeper than the ocean bathymetry) is the temperature of the ocean at the bathymetry depth.

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ICB.tgz (60.5 KB) - added by Nacho Merino 4 months ago.
ICB module with proposed modifications In line with NEMO_3.6_STABLE. (rev 7843)

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Change History (2)

Changed 4 months ago by Nacho Merino

ICB module with proposed modifications In line with NEMO_3.6_STABLE. (rev 7843)

comment:1 Changed 3 months ago by Gurvan Madec

  • Owner changed from nemo to gm

Thanks Nacho to return back to the system this nice and very useful development.
I will add it to the next NEMO version

gurvan

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