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CliC News

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CliC Newsletter - Ice and Climate No. 32

ThumbnailNewsletter32The July 2019 Edition of the World Climate Research Programme's Climate and Cryosphere (CliC) Project Newsletter - Ice and Climate No. 32 is now available.

It includes two science features: one on the GlacierMIP paper on model intercomparison of global-scale glacier mass-balance models and projections, and the second one on sea-ice algal phenology in a warmer Arctic. This issue also contains summaries from various CliC events held during the spring and a list of our upcoming workshops and meetings.

CliC wishes you a good summer!

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Arctic Subarctic Ocean Flux (ASOF) study meeting, April 24-26, 2019, Copenhagen, Denmark

ASOF2019PictureThe yearly Arctic Subarctic Ocean Flux (ASOF) study meeting on 24 -26 April 2019, co-sponsored by CliC, was hosted at the Danish Meteorological Institute (DMI) in Copenhagen, jointly with the H2020 project 'Blue-Action' which is coordinated at DMI. The focus topics for this year's meeting were:

1. Representativeness of ocean observations: A recurring issue in the analysis and interpretation of observational data, as well in the use of these data for model validation and data assimilation, is how their representativeness in space and time are dealt with. This issue is of particular relevance for in-situ data such as oceanic measurements from profiling devices or time series data from mooring locations. We particularly welcomed submissions dealing with questions related to representativeness and uncertainties in observations, what these mean for the observational analysis as well as the usefulness of the data in modelling, and ways forward in resolving those issues in particular in regions of sparse data coverage.

2. Flux calculations: We had fostered a discussion the problems related to the usefulness/ambiguity of heat- and freshwaterflux calculations across single gateways. Can we agree on a way forward?

We had 45 participants joining the meeting, with 34 presentations. In addition to presentations and discussion on the two focus topics we had numerous contributions on core ASOF topics, such as reports on the current status of the gateway moorings, new insights into the dynamics of ocean circulation and exchange between the basins, as well as Ocean-Sea Ice interaction. We gratefully acknowledge the travel support for three early career scientists by CliC, Stefanie Semper from the University of Bergen, Norway, Myriel Horn from the Alfred Wegener Institute for Polar Research, Germany, and Marylou Athanase from L'OCEAN at the Université Sorbonne, France. In addition, thanks to the 'Blue Action' project, two experts on data representativeness in the context of data assimilation and ocean climatologies could be invited, An Nguyen from the University of Texas Austin, USA, and Viktor Gouretsky from the Institute for Atmospheric Physics, Beijing, China.

The agenda and the presentations can be found online here: https://asof.awi.de/outputs/asof-issg-meetings-workshops/copenhagen-april-2019/

CliC-related activities at EGU 2019

Looking for a CliC-related activity at EGU 2019? Find a non-exhaustive list below.


Ice-sheet and climate interactions (CR5.3)
Co-organized as CL4.06
Orals: Wed, 10 Apr, 08:30–10:15 - Room N2
Posters: Attendance Tue, 09 Apr, 10:45–12:30 - Hall X4
Convener: Heiko Goelzer | Co-conveners: Philippe Huybrechts, Alexander Robinson, Ricarda Winkelmann

Modelling ice sheets and glaciers (CR5.1)
Orals: Mon, 08 Apr, 08:30–12:30 - Room L6
Posters: Attendance Tue, 09 Apr, 16:15–18:00 - Hall X4
Convener: Fabien Gillet-Chaulet | Co-conveners: Stephen Cornford, Sainan Sun, Gael Durand

Sea level rise: past, present and future (CL4.07)
Co-organized as CR1.7/G3.9/OS1.26
Orals: Mon, 08 Apr, 08:30–12:30, 14:00–15:45 - Room 0.14
Posters: Attendance Mon, 08 Apr, 16:15–18:00 - Hall X5
Convener: Nadya Vinogradova Shiffer | Co-conveners: Marta Marcos, Svetlana Jevrejeva, Mélanie Becker, Makan A. Karegar, Simon Engelhart, Thomas Frederikse

Ice shelves and tidewater glaciers - dynamics, interactions, observations, modelling (CR5.5)
Co-organized as OS1.20
Orals: Wed, 10 Apr, 10:45–12:30, 14:00–18:00 - Room N2
Posters: Attendance Tue, 09 Apr, 14:00–15:45 - Hall X4
Convener: Adrian Jenkins | Co-conveners: Angelika Humbert, Nicolas Jourdain, Andreas Vieli, Inga Monika Koszalka

ISMIP6 workshop (SMP22)
Wed, 10 Apr, 12:45–13:45 - Room 0.51
Convener: Heiko Goelzer

Changes in the Arctic Ocean, sea ice and subarctic seas systems: Observations, Models and Perspectives (OS1.2)
Orals: Thu, 11 Apr, 08:30–12:30, 14:00–15:45 - Room L4/5
Posters: Posters | Attendance Thu, 11 Apr, 16:15–18:00 - Hall X4
Co-organized as AS4.10/CL2.03/CR6.3, co-sponsored by NORP
Convener: Yevgeny Aksenov | Co-conveners: Daniel Feltham, Benjamin Rabe, Paul A. Dodd, Daniela Flocco, Craig Lee, Julienne Stroeve, Andrew Wells

ESM-SnowMIP Session (SMP15)
Thu, 11 Apr, 12:45–13:45 - Room 0.16
Convener: Richard L.H. Essery


Future evolution of the Greenland Ice Sheet in a coupled climate and ice sheet model: CESM2.1-CISM2.1 contribution to ISMIP6 - EGU2019-16223 | Posters | CR5.3/CL4.06
Tue, 09 Apr, 10:45–12:30 - Hall X4
Laura Muntjewerf, William Lipscomb, Kate Thayer-Calder, Bill Sacks, Sarah Bradley, Marcus Lofverstrom, Jeremy Fyke, Carolina Ernani da Silva, Raymond Sellevold, Michele Petrini, and Miren Vizcaino

Ice sheet model sensitivity on perturbations applied to the ISMIP6 ocean forcing - EGU2019-7998 | Posters | CR5.1
Tue, 09 Apr, 16:15–18:00- Hall X4
Thomas Kleiner and Angelika Humbert

BEPSII Meeting and Poster, at the GRC on Polar Marine Science, March 2019, Barga, Italy

--Contributed by Letizia Tedesco

GRC BEPSII GroupPhotoDuring the GRC on Polar Marine Science that was held at Il Ciocco Resort (Barga, Italy) on 18-23 of March, BEPSII SC members Letizia Tedesco and Klaus Meiners organized an open and informal BEPSII get-together for new and old members. About 15-20 people met over lunch on Wednesday on a sunny Tuscan terrace and continued discussing during a nice walk down the medieval village of Barga, where some of them also stopped in a cafe before returning back uphill to the conference site. The lunch and walk together gave the possibility to several people to meet for the first time, to get to know better what BEPSII is and does and to initialize new discussions and collaborations.

GRC BEPSII photo posterDuring the GRC also BEPSII representative Letizia Tedesco presented on Wednesday afternoon the BEPSII Intercomparison of 1D sea-ice biogeochemical models, one of the many BEPSII tasks. Besides supporting Letizia's participation to the GRC, CliC supports the intercomparison experiment by having funded an initial international workshop that was held at (SYKE) Helsinki in November 2017, and by co-founding the final international workshop that will be held in 15-17 of May at LOCEAN (Paris).

ESM-SnowMIP Meeting at EGU2019, April 11, 2019, Vienna, Austria

--Contributed by Richard Essery

A meeting to discuss ESM-SnowMIP was held on April 11 during EGU 2019, with 20 people in attendance. Richard Essery, Gerhard Krinner and Hyungjun Kim presented progress and plans.

Simulations for 10 reference sites have been submitted by 27 models and 2 ensembles driven with in situ data, and 22 models driven by bias-corrected global data.

An overview paper has been published (https://www.geosci-model-dev.net/11/5027/2018/). A paper documenting the reference site driving and evaluation data is in review (https://www.earth-syst-sci-data-discuss.net/essd-2019-12/), and the data are freely available from https://doi.pangaea.de/10.1594/PANGAEA.897575. Work is now in progress to interpret the results for non-forested sites led by Cécile Ménard, for forested sites led by Paul Bartlett, and for large-scale forcing at reference sites led by Richard Essery.

Global coupled simulations for CMIP6 and global uncoupled simulations for LS3MIP are now underway in major modelling centres. Because of the high demands of these simulations, the requests for additional constrained ESM-SnowMIP simulations will be delayed until they are complete. It has been decided that the SnowMIP-rmLC prescribed snow experiment should be performed in coupled land-atmosphere configurations to avoid extreme hydrological impacts on circulation in coupled land-atmosphere-ocean models.

Additional site simulations can be performed at much lower cost by a wider range of models. A decision will be made whether to prioritise constrained simulations (prescribed constant snow albedo, prescribed neutral exchange coefficient, no soil insulation) or additional reference sites (to include more challenging ice sheet, tundra and prairie locations) in the next round of experiments.

The GSWP3 global driving data being used in LS3MIP can be obtained from http://www.dias.nii.ac.jp/gswp3/input.html with user name gswp3 and password pilotdata2014. These data have not yet been publically released; please contact Hyungjun Kim () to discuss any use.

2018 WCRP CliC Annual Report online

ThumbnailAR2018The 2018 WCRP-CliC Annual Report is available. The report gives an overview of our activities in 2018 and includes contributions from all of the CliC Projects/Groups Leads. CliC would like to thank all of the contributors to the Annual Report.


Table of Content

Overview from the Co-Chairs
Scientific Steering Group (SSG) Members
The International Project Office
Report Format
WCRP Grand Challenge - Melting Ice and Global Consequences
-Contributions to the Intergovernmental Panel on Climate Change (IPCC)
-Ice Sheet Modelling Intercomparison Project 6 (ISMIP6)
-Marine Ice Sheet Ocean Model Intercomparison Project (MISOMIP)
-Earth System Model - Snow Model Intercomparison Project (ESM-SnowMIP)
-Glacier Model Intercomparison Project (GlacierMIP)
-Sea Ice and Climate Modeling Forum / Diagnostic Sea Ice Model Intercomparison Project (SIMIP)
-Permafrost Carbon Network
Sea Ice
-Arctic Sea Ice Working Group (ASIWG)
-BEPSII - Biogeochemical Exchange Processes at Sea Ice Interfaces
-Antarctic Sea Ice Processes and Climate (ASPeCt)
-Permafrost Modeling Forum
Ice Sheets
-SCAR/IASC/CliC Ice Sheet Mass Balance and Sea Level (ISMASS)
Regional Activities
-CLIVAR/CliC/SCAR Southern Ocean Regional Panel
-CLIVAR/CliC Northern Oceans Region Panel
-Polar Coordinated Regional Downscaling Experiment (Polar CORDEX)
Inter-disciplinary Activities
-WCRP Polar Climate Predictability Initiative (PCPI)
2018 CliC Meetings and Workshops

Invitation to contribute to a Special Collection on “The Earth’s energy imbalance and its implications”

Maria Hakuba, Matt Palmer, and Seiji Kato would like to invite contributions to a Special Collection titled “The Earth’s energy imbalance and its implications”, that will appear in the Journal of Climate and all other journals of the American Meteorological Society. Articles for the special collection should consider observations and/or modelling of all aspects of Earth’s energy imbalance and the resultant heating of various components of the Earth system (ocean, land, atmosphere and cryosphere). Please find below an overview of the special collection and practical information on the submission and publication process.

Overview: Climate change poses a major threat to our livelihoods, economy, and ecological treasures. On a range of timescales, climate processes are controlled by energy exchanges within and among the different components of the Earth system. Monitoring these energy flows, and the global net accumulation of energy as a result of radiative forcing, is essential to advance our understanding of climate variability and change, and for developing reliable future predictions.

Anthropogenic radiative forcing of the climate system has given rise to a radiative flux imbalance at the top-of-atmosphere (TOA), referred to as Earth’s energy imbalance (EEI).  Observing EEI is fundamental in determining the rate of climate change at a global scale. To date, the most reliable approach to estimate the absolute magnitude of EEI is through assessing changes in heat storage across all relevant Earth system components. Due to the dominant role of the oceans in Earth’s heat budget, EEI can be reliably estimated from changes in ocean heat content on annual and longer timescales, while satellite observations of TOA net radiative flux variability can provide information at shorter timescales. However, a complete understanding of Earth’s energy flows, particularly on sub-annual timescales, requires improved estimates of change in all system components storing heat: the ocean including the deep ocean; the land surface; the atmosphere; and the cryosphere. Regional energy exchange through the atmosphere-surface boundary, horizontal energy transport by the atmosphere and ocean, and diabatic heating by radiation and precipitation are also essential elements of Earth’s energy flows.

The World Climate Research Programme (WCRP) has identified the improved quantification and understanding of global mean EEI and its spatial and temporal variability to be major challenges in climate research across disciplines. To address these challenges, we invite contributions that improve estimates of EEI and energy uptake across all relevant disciplines and Earth system components, exploiting in-situ measurements, reanalysis, climate modeling, and remote sensing techniques. A particular interest is the discussion of uncertainty associated with measurement and retrieval errors, and assumptions in algorithms. Papers discussing results of inter-comparison studies that identify and quantify biases are encouraged. We also solicit studies on the spatial and temporal variability of global and regional energy budgets at the TOA, the surface and within the atmosphere and studies that improve our understanding of processes that perturb energy budgets and energy flows on various spatial and time scales. Furthermore, we invite authors to consider implications on key impact metrics of climate variability and change, such as  sea level, the hydrological cycle, and regional climate extremes.

This special collection arose out of discussions at the WCRP workshop held in Toulouse during November 2018 and the workshop website may provide further useful context for authors: www.clivar.org/events/2018-wcrp-workshop-earth%E2%80%99s-energy-imbalance-and-its-implications-eei

Authors are reminded that the IPCC AR6 has a deadline of 31st December 2019 for papers to be eligible for citation in the Working Group I report, but the collection itself will continue to accept submissions during 2020.

Practical information for potential authors:

Special collection papers are submitted, reviewed, and published following the same requirements and standards as other papers submitted to AMS publications. The peer review process for each paper will be handled by a regular journal editor, assigned by the journal's chief editor.  Each special collection paper moves through peer review individually, and final decisions are given when the paper is ready (ie, decision times don't depend on other papers in the collection). Once accepted for publication, the same applies: each paper moves through editing, proofs, and final publication individually, and none are delayed due to other papers in the collection. Each special collection paper is assigned to regular monthly issue, and will appear online as part of a regular monthly issue. At the same time, a graphic logo on the  title page identifies the paper as part of a particular special collection, and all papers in a special collection are linked to the collection's web page.

Authors wishing to find out more about the AMS submission process and requirements can go here. This page here lists the links for submitting to specific AMS journals and BAMS. To include your paper in the collection "The Earth's energy imbalance and its implications", begin the submission process in any AMS journal - you will be given the opportunity to select the collection once you have uploaded your manuscript and figure files.

If you already have a submission in review or recently published that you think would be a good fit for the collection, please contact the collection organizers.

Thank you for your consideration and do not hesitate to contact the organizers with questions.

CliC Newsletter - Ice and Climate No. 31

newsletter feb2019 thumbThe February 2019 Edition of the World Climate Research Programme's Climate and Cryosphere (CliC) Project Newsletter - Ice and Climate No. 31 is now available.

It includes three science features: one on the Greenland and Antarctic ice sheets under 1.5°C global warming; another looks at the ESM-SnowMIP paper on assessing snow models and quantifying snow-related climate feedbacks; and the third highlights the KEPLER Project. This issue also contains summaries from various CliC events held at the AGU Fall Meeting and during the Fall and Winter period; and a list of our upcoming workshops and meetings.

In this newsletter, we welcome two new CliC Scientific Steering Group Members. The CliC International Project Office also has some news. As of January 2019, it is no longer hosted at the Norwegian Polar Institute in Tromsø and until it moves to its new host in the coming months, CliC is run by Gwénaëlle Hamon, the Executive Officer, hired as a consultant by WMO.

2018 ISMASS Paper in Nature Climate Change: 'The Greenland and Antarctic ice sheets under 1.5°C global warming'

A review of ice sheets in a 1.5°C warmer world (a new recent climate mitigation target highlighted by the Intergovernmental Panel on Climate Change) suggests that current predictions of future changes in ice-sheet mass balance are questionable due to incomplete understanding of atmospheric circulation changes around Greenland and ocean circulation around Antarctica. However, the study concludes it is important to limit global warming by 2100 to 1.5°C to maximise the chance of avoiding so-called tipping points that would dramatically accelerate mass loss.

Today, sea level rises at a pace of around 4mm per year and is accelerating. The major contributions to this rise are due to ocean expansion, melting glaciers and – becoming increasingly important – melting of the Greenland and Antarctic ice sheets. Those ice sheets are commonly considered as the ‘sleeping giants’ on Earth, as together they can potentially lead to sea-level rise by more than 70 metres over thousands of years.

Despite improved observations and computer model simulations since the IPCC’s Fifth Assessment Report (AR5) published in 2013, the review highlights some lingering key gaps in knowledge regarding climate forcing of the ice sheets and their resulting responses. On longer time scales, both ice sheets may reach tipping points above around a 1.5-2.0°C limit, leading to irreversible mass loss. For Greenland this is due to increased melting of the ice sheet, while for Antarctica this is due to marine instabilities of certain sectors of the ice sheet, in particular the West Antarctica ice sheet. This would lead to multi-metre sea level rise on centennial to millennial time scales, which has existential consequences for small island states and coastal cities across the world.

Lead author Prof. Frank Pattyn said “Limiting global atmospheric warming to 1.5°C will avoid short and long-term surprises coming from both ice sheets and significantly reduce adaptation cost when global sea-level rise is limited and not catastrophic”.

The paper “The Greenland and Antarctic ice sheets under 1.5°C global warming” is published in Nature Climate Change.  This work has been carried out in the framework of ISMASS (Ice Sheet Mass Balance and Sea Level expert group supported by SCAR/CliC/IASC)

Frank Pattyn
Laboratoire de Glaciologie, Université libre de Bruxelles
Tel : +32 485 364495
Email :