Characteristics and Causes of Denmark Strait Overflow Transport Variability

Mattia Almansi1, Thomas W. N. Haine1, Robert S. Pickart2, Marcello G. Magaldi3,1, Renske Gelderloos1, and Dana Mastropole2, 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland. 2Woods Hole Oceanographic Institution, Woods Hole, Massachusetts. 3CNR-Consiglio Nazionale delle Ricerche, ISMAR-Istituto di Scienze Marine, Lerici, Italy.


We present initial results from a year-long, high-resolution (~2 km) numerical simulation covering the east Greenland shelf and the Iceland and Irminger Seas. The numerical model have been run on the Maryland Advanced Research Computing Center (MARCC) and the post-processing have been performed on the Johns Hopkins Data-Scope. Our datasets and user-friendly post-processing scripts are publicly available on The model hydrography and circulation in the vicinity of Denmark Strait show good agreement with available observational datasets. We focus on the variability of the Denmark Strait Over ow (DSO) by detecting and characterizing boluses and pulses, which are the two dominant mesoscale features in the strait. Our model indicates that boluses and pulses play a major role in controlling the variability of the DSO transport into the Irminger Sea. We found that boluses and pulses have a clear signature in Sea Surface Height (SSH): boluses are associated with a bowl in SSH anomalies, while pulses with a dome. This finding allows us to provide a preliminary description of the dynamics that may be involved.