Details
| Original language | English |
|---|---|
| Pages (from-to) | 954-960 |
| Number of pages | 7 |
| Journal | Geophysical research letters |
| Volume | 41 |
| Issue number | 3 |
| Early online date | 11 Feb 2014 |
| Publication status | Published - 10 Mar 2014 |
Abstract
Sea surface topography observations are deduced from an airborne reflectometry experiment. A GNSS (Global Navigation Satellite System) receiver dedicated for reflectometry was set up aboard the German HALO (High Altitude Long Range) research aircraft. Flights were conducted over the Mediterranean Sea about 3500 m above sea level. A signal path model divided into large- and small-scale contributions is used for phase altimetry. The results depict geoid undulations and resolve anomalies of the sea surface topography. For the whole experiment 65 tracks over the Mediterranean Sea are retrieved and compared with a topography model. Tracks differ between right-handed and left-handed circular polarization. The difference, however, is not significant for this study. Precision and spatial resolution decrease disproportionately at low elevations. Eight tracks with centimeter precision are obtained between 11° and 33° of elevation. At higher elevation angles the number of tracks is significantly reduced due to surface roughness. In future such retrievals could contribute to ocean eddy detection. Key Points Altimetric retrieval depicts geoid undulations of the Mediterranean Sea Residuals resolve the sea surface topography with centimeter precision Synergies with other techniques (radar altimeter) arise
Keywords
- GNSS reflectometry, sea surface topography
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
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In: Geophysical research letters, Vol. 41, No. 3, 10.03.2014, p. 954-960.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Sea surface topography retrieved from GNSS reflectometry phase data of the GEOHALO flight mission
AU - Semmling, A. M.
AU - Beckheinrich, J.
AU - Wickert, J.
AU - Beyerle, G.
AU - Schön, S.
AU - Fabra, F.
AU - Pflug, H.
AU - He, K.
AU - Schwabe, J.
AU - Scheinert, M.
PY - 2014/3/10
Y1 - 2014/3/10
N2 - Sea surface topography observations are deduced from an airborne reflectometry experiment. A GNSS (Global Navigation Satellite System) receiver dedicated for reflectometry was set up aboard the German HALO (High Altitude Long Range) research aircraft. Flights were conducted over the Mediterranean Sea about 3500 m above sea level. A signal path model divided into large- and small-scale contributions is used for phase altimetry. The results depict geoid undulations and resolve anomalies of the sea surface topography. For the whole experiment 65 tracks over the Mediterranean Sea are retrieved and compared with a topography model. Tracks differ between right-handed and left-handed circular polarization. The difference, however, is not significant for this study. Precision and spatial resolution decrease disproportionately at low elevations. Eight tracks with centimeter precision are obtained between 11° and 33° of elevation. At higher elevation angles the number of tracks is significantly reduced due to surface roughness. In future such retrievals could contribute to ocean eddy detection. Key Points Altimetric retrieval depicts geoid undulations of the Mediterranean Sea Residuals resolve the sea surface topography with centimeter precision Synergies with other techniques (radar altimeter) arise
AB - Sea surface topography observations are deduced from an airborne reflectometry experiment. A GNSS (Global Navigation Satellite System) receiver dedicated for reflectometry was set up aboard the German HALO (High Altitude Long Range) research aircraft. Flights were conducted over the Mediterranean Sea about 3500 m above sea level. A signal path model divided into large- and small-scale contributions is used for phase altimetry. The results depict geoid undulations and resolve anomalies of the sea surface topography. For the whole experiment 65 tracks over the Mediterranean Sea are retrieved and compared with a topography model. Tracks differ between right-handed and left-handed circular polarization. The difference, however, is not significant for this study. Precision and spatial resolution decrease disproportionately at low elevations. Eight tracks with centimeter precision are obtained between 11° and 33° of elevation. At higher elevation angles the number of tracks is significantly reduced due to surface roughness. In future such retrievals could contribute to ocean eddy detection. Key Points Altimetric retrieval depicts geoid undulations of the Mediterranean Sea Residuals resolve the sea surface topography with centimeter precision Synergies with other techniques (radar altimeter) arise
KW - GNSS reflectometry
KW - sea surface topography
UR - http://www.scopus.com/inward/record.url?scp=84893636488&partnerID=8YFLogxK
U2 - 10.1002/2013GL058725
DO - 10.1002/2013GL058725
M3 - Article
AN - SCOPUS:84893636488
VL - 41
SP - 954
EP - 960
JO - Geophysical research letters
JF - Geophysical research letters
SN - 0094-8276
IS - 3
ER -