Extended PI meeting. Focus warm arctic ocean.
Wednesday in 235 at NBI and/or after lunch in 016.
Thursday in 016.
Note the new date. Meeting has been moved from 15/8 to 6/9. Updates from the Copenhagen groups.
09:00-09:30 -Sindhu: “Total air content results from Renland and preliminary interpretation”-20 min, 10 min Q
09:30-09:50-Kerim: “why am I in Copenhagen”, 20 min total
09:50:-10:30-Nicholas: “Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in Northeast Greenland”, 30 min, 10 Q
10.30-10:40 Short break
10:40-11:10-Shuting/Jens “update on Idas work on nudging of the sea ice” 20 min, 10 Q
11:10-11:35-Diana: “Northern hemisphere methane realize in MIS5a as revealed by high-resolution gas measurements in ice cores.” 15 min, 10 Q
11:35-11:45-Paul: “Update on Mt. Brown project”
11:45-12:00 Update of publication list and misc. Please prepare one minute (one slide) about any new puplications/new submissions. Also let Helle know of new puplication plans. 10 min
12.00 Lunch at CIC. If you stay for lunch and is not at CIC normally please let Helle know.
Further agenda for those who are interested
- Paul: Ideas for new project about dust
ACDC 2017
Topic: The Dynamics of the Seasonal Cycle
Date: September 11th – 22nd, 2017
Location: Rondvassbu, Rondane National Park, Norway
Application deadline: 10th of March, 2017
Online application form: HERE
Target: Advanced PhD candidates and early career scientists.
Goal: To mix students and lecturers with empirical and dynamical training within
climate science and focus on understanding the basic principles and dynamics of the
seasonal cycle across different timescales. This summer we will explore what we can
learn from the largest reoccurring change in Earth´s climate.
Confirmed lecturers: Peter Huybers (Harvard), David Battisti (University of
Washington), Camille Li (UiB), Jake Gebbie (WHOI), Patrick Heimbach (UTexas/MIT),
Kerim H. Nisancioglu (UiB/UiO), Øyvind Paasche (UiB), Tore Furevik (UiB).
- The workshop starts Wednesday Sep 20 at 12.00, and ends Friday Sep 22 at 12.00.
- A PROMICE 10-year jubilee and reception is planned for the afternoon of Sep 22.
- to present and discuss results on modeling of meltwater retention processes in snow and firn on ice sheets and glaciers;
- to plan and coordinate meltwater retention model development;
- to emphasize optical remote sensing snow parameter data comparison and data assimilation;
- to formulate a protocol for a meltwater retention model intercomparison project (RetMIP)
- Snow model development
- Meltwater retention model validation
- Meltwater retention model intercomparison project (RetMIP)
- Optical remote sensing to improve snow models
- survey and prioritize remotely sensed snow parameter data users’ requirements for global and regional snow information
- discuss how to enhance methods for estimating snow parameters, either from remote sensing or from modeling, and to evaluate advantages and disadvantages of the different approaches
- consult users about the utility/interest in other snow products suitable for studying climate-related issues.
- a protocol for a retention model intercomparison project (RetMIP) including instructions and datasets for validation.
- a list of requirements and minimum accuracy levels for models using optical remotely sensed snow parameter data
- a journal special issue like the 2016 special issue in Frontiers in Earth Science – Melt Water Retention Processes in Snow and Firn on Ice Sheets and Glaciers: Observations and Modeling, papers feeding into the IPCC Special Report on Climate change and the oceans and the cryosphere.
ICAT PhD school 2017
Week 39 -2017
Scope and participation:
The PhD course is aimed at PhD students and junior postdocs who conduct ice core analysis or are users of ice core data (glaciological, oceanographic, climate modelers).
The results from ice cores cannot be fully appreciated without understanding the analytical techniques behind the measurements as well as the implicit assumptions related to the emission, transport and deposition of the species analysed.
These include a variety of approaches such as continuous flow analysis (CFA) for the analysis of impurities, but also ion chromatography, ICP-MS and a number of other methods used for high resolution measurements of the impurity content in ice cores. Laser spectroscopy has replaced older-generation technology such as mass spectrometry for the analysis of some gases preserved in polar ice.
ICAT aims to educate a new generation of ice core researchers and foster a collaborative environment for future glaciological projects.
The course will enhance the knowledge between PhD’s within the ice core community on new methods developed for the analysis of ice core climate.
Application will open shortly and the application deadline is 1st of June.
Contact Hellek@fys.ku.dk
09:00-09:30 –Mads- The role of the Southern Ocean in the global ocean circulation and its representation in coarse resolution models-(20 min+ 10 min Q)
09:30-10:00- Andreas-The Surface Mass Balance of the Greenland Ice Sheet during the Last Interglacial (20 min+ 10 min Q)
10:00-10:10-Silje short introduction
10:10-10:20-Jonathan short introduction
Break 10:20-10:35
10:35-10:55 Peter on meltwater meeting
10:55-11:25 Martin O update on project? (20 min+ 10 min Q)
11:25-11:40 Martin S preliminary results from an analysis of Shuting’s long run using self-organizing maps.
11:40-11:50 Update of publication list. Please prepare one minute (one slide) about any new publications/new submissions. Also let Helle know of new publication plans.
11.50-12:00 Update on Future meetings
Extended PI meeting -DO theme
PhD defense by Niccoló Maffezzoli
Title: SODIUM, IODINE AND BROMINE IN POLAR ICE CORES.
Abstract: This research focuses on sodium, bromine and iodine in polar ice cores, with the aim of reviewing and advancing their current understanding with additional measurements and records, and investigating the connections of these tracers with sea ice and their feasibility as sea ice indicators. Modern Arctic sea ice decline clearly yields further motivation in this direction, as the reconstruction of past sea ice conditions could provide clues to the mechanisms in play nowadays and in the future projections. Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) has been applied for the determination of Na, Br and I in firn records retrieved at Law Dome and Talos Dome (Antarctica) and in the NEEM and Renland ice cores (Greenland).
The dissertation is presented as a monograph. It is structured in a way that would logically bring the reader from the broad perspective of sea ice and ice cores into the details of the physical and chemical transformations of these impurities from their emission to their deposition and finally to their determination in ice cores and interpretation of their climatic significance. This view reflects, to some extent, the thread of understanding that led to the research activities.
Chapter 2 briefly introduces sea ice, with particular focus on its salinity as a source of sea salt aerosols. Some features regarding the role of sea ice in the climate system and the differences between sea ice in the two hemispheres are described. The chapter ends with a brief summary of the state-of-the-art of the chemical tracers that are used in ice cores and marine sediment cores to reconstruct past sea ice.
Chapter 3 introduces ice cores with a geochemical perspective. The historically measured ions and compounds are described, together with their climatic relevance. The chapter ends with a description of the main analytic al techniques used to measure ionic and elemental species in ice cores.
Chapter 4 introduces sodium, bromine and iodine with a theoretical perspective and a particular focus on their connections with sea ice. Some of the physical and chemical properties that are believed to affect the sea salt aerosol signature in ice cores are described. Halogen chemistry is presented, with a particular focus on the halogen sources and radical chemistry in the polar boundary layer. The chapter continues with a historical review of the relevant atmospheric studies that have demonstrated the activation of halogen compounds and the importance of halogen chemistry at high latitudes. Finally, the use of sodium and bromine as sea ice tracers is introduced.
Chapter 5 describes the Renland ice core, drilled in coastal East Greenland in 2015 as part of ”Ice2Ice”, a project which aims at understanding the causes of past abrupt climate changes in Greenland. The study of the timescale and other glaciological parameters led to the calculation of the annual accumulation rate for the past 4000 years. Finally, a study of the potential sea salt aerosol sources arriving at the ice core site is presented, using back trajectory analyses of the past 17 years. The results identify the aerosol source area influencing the Renland ice cap, a result necessary for the interpretation of impurity records obtained from the ice core.
Chapter 6 reviews the published ice/snow measurements of bromine and iodine at polar latitudes. Where available they are compared to atmospheric halogen measurements. A selection of sodium records from the same locations is included to provide a more complete picture. The additional measurements performed during the research activities are also displayed. With the goal of presenting and extending the state-of-the-art of knowledge of bromine and iodine in polar snow, a critical comparison between the proxies is adopted, trying to elucidate the established and the unknown features and their potential as sea ice indicators. The last section is dedicated to the measurements of sodium and bromine in the Renland core, which could provide the first ice core-based reconstruction of Arctic sea ice in the Greenland Sea for the last 125 kyr.
Supervisor
Paul Vallelonga, Centre for Ice and Climate, Niels Bohr Institute
Assessment committee
Thomas Blunier, Centre for Ice and Climate, Niels Bohr Institute
Margareta Hansson, Institutionen för naturgeografi, Stockholms Universitet
Michel Legrand, Laboratoire de Glaciologie et Géophysique de l´Environment
If interested please contact Niccoló Maffezzoli for a copy of the thesis (maffe@nbi.ku.dk)
Dear all
The dates are now fixed for the NEGIS workshop and EGRIP Steering Committee meeting 2017. I have been asking around and this seems to be the best we can do.
I would like to ask the consortia chairs to plan when they want to have their meeting (and if they need one or two blocks for the meeting). The consortia list is here: consortia-meetings-2016
After the EGRIP fieldseason, beginning of September, I will email all chairs again to finalize the program.
The NEGIS workshop is intended to be a workshop covering all activites on NEGIS – from iceridge to ocean. I would ask you to email me if you are interested in participating and also names (and emails) for researchers outside the EGRIP community we would like to invite.
the very best
Dorthe
Sunday 29 October 2017
18-22 NEGIS workshop IceBreaker
Monday 30 October 2017
9-18 NEGIS workshop
18-22 NEGIS dinner
Tuesday 31 October 2017
9-18 NEGIS workshop
13:00-15:30 EGRIP consortia meetings (1)
16:00-18:00 EGRIP consortia meetings (2)
Wednesday 1 November 2017
9:00-12:00 EGRIP consortia meetings (3)
13:00-15:30 EGRIP consortia meetings (4)
16:00-18:00 EGRIP SC meeting
18:00 – 22:00 Icebreaker and EGRIP SC Dinner
Thursday 2 November 2017
9:00-17:00 EGRIP SC meeting
Friday 3 November 2017
9:00-17:00 ReCAP meeting
PI meeting (dinner the 8th)
Ice2Ice Greenland Surface Mass Balance Workshop
23rd -24th November 2017
Aims:
Workshop on Greenland ice sheet surface mass balance calculations and observations with a focus on ice sheet modelling and climate and ice core interpretation within ice2ice. We will compare SMB produced using different models and forced with C-Earth, NorESM, HIRHAM, WRF etc to examine the sensitivity of SMB to different methods of calculation and to evaluate what implications these have for ice sheet dynamics and the interaction between ice sheet and climate in models.
Session suggestions:
- SMB schemes: PDD, SEB, intermediate complexity SEB, problems with reconstructing SMB for long palaeoclimate runs
- Observations of Greenland SMB: Promice/Museum invited speaker, long-term records and reconstructions of SMB in Greenland
- Sensitivity analysis of SMB formulations: Topography, GCM/RCM, Albedo, SST + sea ice
- Implications of SMB for glacier dynamics and model inversion. Andreas (+ others) on ice sheet modelling
- CISSEMBEL introduction: Christian Rodehacke to present model, Ruth to present Devon Ice Cap work, Christian/Shuting on Greenland.
Preliminary Programme:
Thursday 23rd November
8:30 am coffee
9am -10.30am session 1 presentations
10:30 -10.45am break
10:45 – 12am Discussion session 1
12-1pm Lunch at DMI
1-3pm session 2
3 – 3.30 pm break
3.30-4.30pm Discussion session 2
Workshop Dinner 19:30
Friday 24th November
8:30 am coffee
9am -10.30am session 3 presentations
10:30 -10.45am break
10:45 – 12am Discussion session 3
12-1pm Lunch at DMI
1-2pm session 4
2 – 3.30 pm Discussion session 2 and wrap-up
Outcomes:
Paper on Modelling Ice Sheet Surface Mass Balance in Palaeoclimate Simulations
Review of different methods used, analysis of model sensitivity and impacts on modelled SMB and possible implications for ice sheet dynamics (not just a review paper!)
Open to other suggestions!
Please confirm your attendance to Ruth Mottram (rum@dmi.dk ) and/or Andreas Plach (andreas.plach@uib.no )
Please confirm attendance and submit any proposed talk title and ideally abstract by 20/11/2017.
Francesco Muschitiello
(Lamont-Doherty Earth Observatory of Columbia University)
Title: “Deep-water circulation leads North Atlantic climate during the last deglaciation”.
Abstract: Constraining the response time of the climate system to changes in Atlantic Meridional Overturning Circulation (AMOC) is fundamental to improve climate predictability. Here we present a precise synchronization of terrestrial, marine and ice-core records that reveals for the first time the ocean-atmosphere lead-lag nature during rapid North Atlantic climate transitions of the last deglaciation. Using a continuous record of deep water ventilation from the Nordic Seas, we identify a systematic ~250-year lead of deep-water export on abrupt climate changes recorded in Greenland ice cores –in and out of the Younger Dyas stadial (YD)– in response to gradual changes in freshwater forcing. Supported by transient climate model simulations, our results also point at a delayed response of atmospheric CO2 rise to AMOC slowdown at the onset of the YD. We conclude that variations in North Atlantic deep-water formation are precursors to large-scale climate and pCO2 changes, which highlights the need for improved long-term future AMOC projections.