V. Fofonova1,3, R.Doerffer2, H. Orek2, A.C. Kraberg3, B.Heim 4, P. Overduin 4, S.Danilov1, K.H. Wiltshire1,3,4 1 AWI-Bremerhaven, 2 HZG, 3 AWI-Helgoland, 4 AWI-Potsdam
The Future of Operational Oceanography, 2013
Observations Physical modeling
-12 -10 -8 -6 -4 -2 0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
water depth (m)
netPP mg m-3 30 min-1
Modeled impact of an open polynia on the temperature field at 3 m, [˚C].
Forcing is from COSMO simulations under conditions that polynia is
(a) absent (b) present
Period of simulations 9 - 31 May 2008
The Lena Delta region of the Laptev Sea serves as an indicator of climate change.
We estimate the impact of different factors on the dynamics in the region.
The seabed topography based on observed bathymetry data, m ( 0m– terrestrial area)
Sample-environment biplot of the redundancy analysis of the 2010 phytoplankton data. Three clusters occurred: 1. freshwater species, 2. brackish marine cluster, 3. cluster dominated by sub-surface samples.
The dominant environmental factors were temperature, salinity and stratification strength
Ecosystem dynamics
Estimated Primary Production for Lena 2011 07 approx. 600 mg C m-2 d-1
Red line – Delta
transects, blue line – coastal
transects
Basic parameters measured during the LENA2010 expedition
Temperature Salinity
pH Dissolved oxygen
The goal is modeling the shelf circulation dynamics under the action of varying atmospheric forcing, Lena runoff and tidal forcing, and their impact on ecosystem dynamics. An unstructured-grid Finite Volume Coastal Ocean Model (FVCOM) is used as a modeling tool.
Hydrodynamics and bio-optical analysis via remote sensing
Spring season with sea ice coverage 17-04-2011, MODIS max. infrared surface temperature, ˚C, the warm temperature features indicate the polynias system
The season when the daily flow of Lena reaches a maximum (based on daily observation data)
The theoretical slope of the line is significantly different from 0 with 82% probability
LENA2011 stations
(Jun 26 to Jul 7 2011)
TSM (Total Suspended matter) and Particulate Carbon content in sequence of sample number
LENA2010 stations and calculated euphotic depth (MERIS 05-08-2010)
04-07-2011 MERIS ADG absorption coefficient443nm
(absorption detritus & gelbstoff) shows the far-reaching transport of organic matter
04-07-2011 MERIS TSM
shows that particle suspension dips down as bottom suspension or settles close to the Delta
8 8.5 9 9.5 10 10.5 11
3 3.5 4 4.5 5 5.5 6
f(x) = 0.56x - 0.71 R² = 0.60
DOC [g m -3]
ay442 [m-1]
0 10 20 30 40 50 60 70 80
0 10 20 30 40 50 60 70 80 90
f(x) = -0.91x + 91.09 R² = 0.92
TSM [g m-3]
Secchi disc depth [cm]
Relationship between DOC and the absorption coefficient442 nm
Relationship between TSM and Secchi disk depth for all Lena River stations
Phase of modeled M2 constituent for ice-free conditions in the Laptev Sea, [deg]
Phase of modeled M2 constituent for ice-free conditions in the Laptev Sea, [m]
b) a)
