1 / 15

BUOYANT EDDIES ENTERING THE LABRADOR SEA OBSERVED WITH GLIDERS, FLOATS AND ALTIMETRY*

Thanks to Jonathan Lilly . See also Williams, et al., 2008. BUOYANT EDDIES ENTERING THE LABRADOR SEA OBSERVED WITH GLIDERS, FLOATS AND ALTIMETRY*. By Hjálmar Hátún (1,2), Charles C. Eriksen (1), and Peter B. Rhines (1) 1) University of Washington, 2) Faroese Fisheries Laboratory.

oni
Download Presentation

BUOYANT EDDIES ENTERING THE LABRADOR SEA OBSERVED WITH GLIDERS, FLOATS AND ALTIMETRY*

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Thanks to Jonathan Lilly  See also Williams, et al., 2008 BUOYANT EDDIES ENTERING THE LABRADOR SEA OBSERVED WITH GLIDERS, FLOATS AND ALTIMETRY* By Hjálmar Hátún (1,2), Charles C. Eriksen (1), and Peter B. Rhines (1) 1) University of Washington, 2) Faroese Fisheries Laboratory *JPO,vol. 37

  2. April (2nd half) The spring (March-June) bloom in the NE Lab. Sea SeaWifs Six-year composite (1998–2003) Wu, Y. et al., 2008: Marine Ecology Progress Series, Vol. 355.

  3. MLD (m) ...associated with low-salinity surface water SSS ...Caused by a shallow mixed layer (Wu, Y. et al., 2008) Six-year composite (1998–2003)

  4. West Greenland Current 2. Off-shelf advection of low-salinity WGC water Origin of the low-salinity water? Hypothesis in Wu et al., 2008: • Regional high • precipitation rate

  5. But It’s a deep hydrographic anomaly... Salinity (50m) Temp. (50m) West Greenland Current Water Salinity (500m) Temp. (500m) Irminger Current Water Synoptic hydrography (March-April, 1966)

  6. Origin of the low-salinity water? • Regional high precipitation rate Unlikely 2. Off-shelf advection of low-salinity WGC water 2a. Due to a mean flow? 2b. Due to eddies? And what about interannual variability?

  7. Seaglider Seaglider 015 Seaglider 014 Eddy activity Eddy-kinetic energy (EKE) based on satellite altimetry (Lilly et al. 2003) (Hatun, Rhines and Eriksen, 2008, JPO, Vol. 37)

  8. Eddies Position of Seagliders Sea surface temperature signature of eddies 19 March, 2005 sg014 Courtesy: Physical Oceanography Distributed Active Archive Center (PO.DAAC) (Hatun, Rhines and Eriksen, 2008)

  9. WGCW IW Hydrographic cross-sectionsof an Irminger Ring Temperature Salinity (Hatun, Rhines and Eriksen, 2008)

  10. Density and velocity cross-sections of an Irminger Ring Velocity Density (Hatun, Rhines and Eriksen, 2008)

  11. Strongest influence on the NE Lab. Sea Simulated eddy tracks (Chanut et al., 2007 in JPO) The eddies advect much low-salinity water (and buoyancy) into the NE Labrador Sea!

  12. Next challenge: (Courtesy: E. Head) 5.6 3 Chlorophyll (mg/m ) Month Interannual Variability - Biology Chlorophyll 4.7 1.8 3.8 3.8 4.8 3.2

  13. First SSH EOF CLS (gridded) data Less variability Larger variability Challenge: Interannual Variability - physics Note: All values are negative! First SST EOF AMSRE data

  14. SST time series (AMSRE) SSH time series SST increasing SSH increasing Increasing chlorophyll Summer 2000 Interannual Variability - Physics and Biology Challenge: Covariation between the bloom intensity and the physics (SSH and SST) the following summer

  15. Two messages Persistent background stratification due to Irminger Rings Similar inter-annual variability in biology and in physics

More Related