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The DNSC08MDT Mean Dynamic Topography. Ole B. Andersen and P. Knudsen (DTU-SPACE). The DNSC08MDT. The DNSC08 Mean Dynamic Topography. The DNSC08 is developed from the DNSC08 Mean Sea surface and the EGM2008 Geoid model using the geometrical difference:. The DNSC08 Mean Dynamic Topography.

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the dnsc08mdt mean dynamic topography

The DNSC08MDT Mean Dynamic Topography

Ole B. Andersen and P. Knudsen (DTU-SPACE)

the dnsc08mdt
The DNSC08MDT

EGU meeting, Vienna, Austria | April 2008 | OA | page 2

the dnsc08 mean dynamic topography
The DNSC08 Mean Dynamic Topography
  • The DNSC08 is developed from the DNSC08 Mean Sea surface and the EGM2008 Geoid model using the geometrical difference:

EGU meeting, Vienna, Austria | April 2008 | OA | page 3

the dnsc08 mean dynamic topography1
The DNSC08 Mean Dynamic Topography
  • The DNSC08 is developed from the geometrical difference between the DNSC08 Mean Sea surface and the EGM2008 Geoid model using the difference:
  • Subsequently the Difference have been smoothed using a gaussian smoother with a halfwidth of 75km.
  • Notice: The mean sea surface and the Geoid will consequently coincide for shorter spatial wavelength as the altimetric gravity anomalies are introduced in the derivation of the global geoid.
  • Consequently shorter wavelength in the MDT might not be accurately mapped in the DNSC08 MDT
  • DNSC08MSS Min and max values are -1.86 m and +1.35 meters. The average is 0.23 meters

MDT = MSS – Geoid 

EGU meeting, Vienna, Austria | April 2008 | OA | page 4

the dnsc08 mean dynamic topography2
The DNSC08 Mean Dynamic Topography
  • The global mean of the difference between EGM2008 and DNSC08MSS is 23 cm integrated over all oceans of the world (but not spatially weighted).
  • This difference have not been accounted for in DNSC08MDT which will have a mean of 23 cm. The average of OCCAM 1993-2001 is 18 cm.
  • The mean and the MDT is representable for the period 1993-2004.

EGU meeting, Vienna, Austria | April 2008 | OA | page 5

inter annual variation relative to global trend
Inter-Annual variation relative to global trend

Annual mean offsets relative to mean and sea level trend over the 1993-2004 period

1993 1994 1995

1996

1999

2001

EGU meeting, Vienna, Austria | April 2008 | OA | page 6

slide7

Consistent Inter-annual Sea Level variation

Assuming the geoid is stationary

Geoid = MSS – MDT, G (period1) = G (period2)

The MDTs / MSS’s adjusted for the inter-annual sea level variations is

MDT(period1) = MDT(period2) + ΔMSS(period1) - ΔMSS(period2)

EXAMPLE:

The MDT model represent the period 1993-2001 will then be

MDT(93-01) = MDT(04-93) - ΔMSS(93-01) (as ΔMSS(93-04) = 0)

DNSC08MSS/MDT is provided with a program to perform this correction

EGU meeting, Vienna, Austria | April 2008 | OA | page 7

slide8

DNSC08-OCCAM Synhtetic Geoid Model

DNSC08 MSS

The OCCAM 93-95 MDT

The 93-95 -> 93-01

Interannual Sea Level

Anomaly Correction.

DNSC08 MSS - OCCAM MDT synthetic geoid.

Consistent inter-annual SLA modelling

EGU meeting, Vienna, Austria | April 2008 | OA | page 8

slide9

Summary

  • DNSC08 Suite of Global Fields
    • Resolution: 1 minute by 1 minute (2 km by 2 km)
    • True global fields (90°S to 90°N)
  • DNSC08: ftp.spacecenter.dk/pub/MDT
  • DNSC08 All files: ftp.spacecenter.dk/pub/DNSC08 (all files)
          • DVD: Contact oa@space.dtu.dk
  • Consistent Products available:
    • Altimetric (geometrical) MSS DNSC08-MSS
    • Altimetric derived Bathymetry DNSC08-BAT
    • Altimetryc derived MDT DNSC08-MDT
    • Altimetric Marine Gravity field DNSC08-GRA
    • Products also available in Google Earth

EGU meeting, Vienna, Austria | April 2008 | OA | page 9