Funded Projects – University of Copenhagen

Funded Projects in TeamOcean:

Carbon Cycle

Glacial-Interglacial Carbondioxide Variability: the Equatorial Hypothesis (EQUYP)

The Danish Council for Independent Research | Natural Sciences
Instrument DFF-Research Project 1 | Case 4002-00397 |  Jan 2015- Dec 2017

a: A compilation of benthic foraminiferal oxygen isotope records that reflect changes in continental glaciation and deep ocean temperature.
b: Atmospheric CO$_{2}$ concentration as reconstructed from Antarctic ice cores.
c: Antarctic air temperature as reconstructed from the deuterium content of an
Antarctic ice core.
d: The sediment reflectance of an Antarctic deep sea sediment record from the Ocean Drilling Program, which varies with the concentration of biogenic opal produced by phytoplankton in the surface ocean. Grey bars indicate warm intervals, so called interglacials [the figure has been adapted from Sigman et al. 2010].

Project Description:
Over the last 800,000 years earth's climate went through several glacial and interglacial eras. They are correlated with changes in earth's orbit and associated changes in insolation. Over this period changes in global ice volume, temperature and atmospheric carbon dioxide concentration have been strongly correlated with each other. The connection between temperature and ice volume is not surprising, and a strong snow/ice - albedo feedback makes it plausible to connect both to changes in the earth's orbit. The magnitude of the carbon dioxide variations, however, is still not understood.
The proposed work uses Earth System Models and focuses on the following hypothesis:

Changes in the earth's orbit modify the stratification of the equatorial oceans, leading to different diapycnal mixing rates and thereby different carbon dioxide outgassing in the equatorial upwelling zones. This changes the atmospheric carbon dioxide concentration through a change of the oceanic carbon dioxide source.

Tropical Atlantic: PREFACE project

PREFACEEnhancing prediction of Tropical Atlantic climate and its impacts – is a climate change project with 28 partners across 18 countries in Europe and Africa.

The Tropical Atlantic is a region of key uncertainty in the earth-climate system: state-of-the-art climate models exhibit large systematic error, climate change projections are highly uncertain, and it is largely unknown how climate change will impact marine ecosystems and what are the consequent global socio-economic impacts. The magnitude of the problem and the need to resolve it is internationally recognised.

PREFACE takes on the challenge to redress this situation through the first comprehensive assessment of the Tropical Atlantic. Together European and African expertise will combine sophisticated observation systems, extensive field experiments and regional and global scale modelling capabilities to achieve this.
Please visit the dedicated website for more info

Arctic Ice: The ICE2ICE project

The research project Arctic Sea Ice and Greenland Ice Sheet Sensitivity (ice2ice) is the first concerted effort to tackle the first order question of the cause and future implications of past abrupt climate changes in Greenland, a key hypothesis being that Arctic and sub-Arctic sea ice cover excerts important controls on past and future Greenland temperature and ice sheet variations
Please visit the dedicated website for more info

Resolving Eddies on the Juelich BlueGene

Ocean general circulation models (OGCMs) have long been used to investigate oceanic circulations and their variation with various spatial and temporal scales. Mesoscale eddies, which diameters are about 100 km, should be resolve in order to reproduce not only basin-scale circulation but also eddy activities and proper path of western boundary currents. They also play an important role to meridional transport of heat and momentum.

In this work, successful outcomes and advanced visualizations from a series of eddy-resolving simulations in the world ocean: A 50 year spin-up run, hindcast run from 1950 to 2003 and tracer run incorporated with chlorofluorocarbons (CFCs), are reported.
Here is an example of the work done by TeamOcean in this respect