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Geodetic Features of the Ocean Surface and their by J. R. Apel, W. S. Wilson (auth.), G. Seeber, J. R. Apel

By J. R. Apel, W. S. Wilson (auth.), G. Seeber, J. R. Apel (eds.)

This quantity comprises lots of the papers that have been provided on the Interdisciplinary Symposium No. four "Geodetic positive factors of the sea floor and their Implications" through the XVIII. common meeting of the foreign Union of Geodesy and Geophysics (IUGG) in Hamburg, August 1983. The symposium was once together backed through the overseas Associ­ ation of Geodesy (lAG) and the overseas organization for the Physi­ cal Sciences of the sea (IAPSO), and used to be as such one additional step in animpQrtant line of foreign and interdisciplinary symposia, re­ lated to the sphere of Marine Geodesy. initially the time period "Marine Geodesy" used to be largely understood as "Geodesy within the Marine surroundings" and dealt essentially with as­ pects: distinctive place selection at sea and resolution of a superb based marine geoid. notwithstanding, typically with the impression of satel­ lite radar altimeter measurements, a brand new realizing started to enhance: it turned obvious that the sphere of Marine Geodesy couldn't be handled accurately from geodesists on my own yet that it wanted shut cooperation with comparable disciplines equivalent to oceanography and marine geophysics. Symposium No. four at Hamburg may possibly exhibit that this coopera­ tion has already turn into a full of life truth. The "geodetic good points of the sea floor" do not in simple terms mirror oceanographical but in addition marine geo­ actual points. As such scientists from geodesy, oceanography, marine geology and geophysics got here jointly to provide their rules and to dis­ cuss questions of mutual interest.

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At the present time, uncertainties in these two areas are several t1mes too large for reliable mapp1ng of surface c1rculat1on. Recently, however, some surpris1ngly reasonable results have been obta1ned using ex1st1ng Figure 7. Dynamie topographie determined from altimetry. Contours in eentimeters represent the differenees between a long-term mean sea surfaee and a global geoid model. 5 years of Geos-3 data plus all existing Seasat altimetry. The geoid model, ealled PGS-S4, is based on a eombination of satellite observational data, surfaee gravity, and also altimeter data.

DELIKARAOGLOU 4 3 ~ I- ::I: C> w :I: w 2 REV 202 ~ ~ o ~-L o __ ~-L __ .... ~~~~~ __ ~~ 500 __ MU~~~~ 1000 __ L--4~ 1500 DISTANCE KM FIGURE 2 (e) Figures 2(a)-(e) - Profiles of observed sea surface heights along SEASAT rev 202 aod 690 compared with GEH-lOB geoid undulations. Series of atmospheric pressure, wind and sea state variability along the same profiles are also shown. ADJUSTMENT AND FILTERING OF SEASAT ALTIMETRY 45 APPLICATION AND TEST RESULTS In this section we present the results of two sets of SEASAT altimetry arcs reduced with the LSRT, which demonstrate the versatility of the technique as a rapid computational approach to the adjustment and filtering of single-track altimetry data.

ENGELIS AND R. H. RAPP The second degree term of GEML2 as gi yen by Lerch et al. has the induced permanent tidal deformation removed, assuming that secular and elastic Love numbers are the same. 256577 (4) Using this flattening and the augmented GH1L2 potential coefficients, the N values were computed from (2) assuming No was zero. SEA SURFACE TOPOGRAPHY ESTIMATES The va 1ues of sea surface topography as coul d be computed from No term has not been used in computi ng N. In order to remove the bi as we defi ne the bi as free sea surface topography as follows: (1) would be subject to a bias since the = Ss - M(s - N) ~s (5) where ss is derived from (1) with N computed using No equal to zero .

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