2023 CESM Workshop - Land Ice Working group meeting: NorESM2 climate evolution until 2300

Sep 4, 2026

Uploaded by Logic

Workshop material on the Land Ice Working Group within the CESM framework, focusing on how an evolving Greenland ice sheet (CISM) coupled to NorESM affects climate outcomes up to the year 2300. The content outlines coupling strategy in CESM2, including ice–atmosphere/land interactions and land–ocean freshwater pathways, while noting the lack of direct ice–ocean coupling. It specifies three simulations (NorESM, NorESM-CISM, and control) under SSP585 with reduced CO2 emissions, and presents initialization and ice-sheet change diagnostics such as thickness evolution, surface mass balance, sea-level contribution, and temperature responses.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages20

Reading Time50 min

AccessFree to download

What effect has an evolving ice sheet to the global climate?

Here: Greenland ice sheet (CISM) coupled to NorESM

Initialization

Changes on the ice sheet

Greenland ice sheet surface mass balance

BJERKNESCENTREUNIVERSITY OF BERGENfor Climate ResearchFarnly of Matematics and Nazaral Sciences2023 CESM WorkshopLand Ice Working group meetingNorESM2 climate evolution until 2300with an evolving Greenland ice sheetKonstanze Haubner,UiB GEO&Heiko Goelzer,Andreas Born,Petra Langebroek and the KeyClim team NorESM2 with ice sheet module CISM Interactions -based in CESM2: Ice -Atmosphere/Land -Surface mass balance-elevation feedbackthrough downscaling (every year) -Atmospheric changes through ice area and iceelevation change (every 5 years) Ice -Ocean: -No direct ice-ocean interactions(due to fjord vs.model resolution mismatch) -Changes in freshwater fluxes impact oceaninformed via land and run off modules # What effect has an evolving ice sheet to the global climate? Here:Greenland ice sheet(CISM)coupled to NorESM 3 simulations:based on NorESM CMIP6 extended to 2300: NorESM NorESM-CISM control (no forcing) Forcing:SSP585 extended with -CO2 emissions reduced linearly starting in 2100 to less than 10 GtC yr-1 in 2250 -Other emissions are held constant at 2100 levels Resolution NorESM:4km Land ice 1deg Ocean 1deg Atmosphere/Land≈111kmx13-55km over Greenland # Initialization # Changes on the ice sheet Ice thickness Ice thickness change Ice thickness change Ice thickness change Ice thickness change mm # Greenland ice sheet surface mass balance Sea level contribution of Greenland ice sheet(cumulative)盒HAVFORSKNINGSINSTITUTE mm/day Global average air temperatureGlobal average sea surface salinity 34.4 34.322 34.2 34.11834.0 33.9 33.814-33.7 Maximum AMOC-Atlantic/Aarctic ocean 26.5N242016121850190019502000 20502100 2150220022508UNIVERSITY OFBERGEN盒HAVFORSKNINGINSTTUTE with CISM:1980 (1970 to 1989) Evolution NorESM-CISM Surface air temperature(℃) 2300 2100 2200 (2281 to 2300) (1981 to 2100) (2181 to 2200) Difference to initial state NorESM-CISM with CISM:1980 (1970 to 1989) 1980-PI Surface air temperature(℃) 2100 (1981 to 2100) 2100-PI 2200 (2181 to 2200) 2200-PI 2300 (2281 to 2300) 2300-PI

FAQs

How are Greenland ice-sheet changes coupled to NorESM in the simulations?

Greenland ice sheet (CISM) is coupled to NorESM within CESM2. The setup includes ice–atmosphere/land interactions and elevation-related feedbacks through downscaling, while sea-level and temperature impacts are analyzed over time to 2300.

What simulation experiments are compared to assess the climate effect?

Three simulations are used: NorESM, NorESM-CISM, and a control run with no forcing. The SSP585 forcing is extended to 2300 with linear CO2 reductions starting in 2100 and other emissions held constant at 2100 levels.

Why are there no direct ice–ocean interactions in this configuration?

Direct ice–ocean interactions are not included due to a fjord versus model-resolution mismatch. Instead, freshwater-flux changes affect the ocean indirectly through land and runoff modules.

Sep 4, 2026

Uploaded by Logic