Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements
We investigate the nonseasonal and high‐frequency variations of the Argentine Gyre in the south Atlantic Ocean by analyzing the time‐variable gravity (TVG) measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission in conjunction with the satellite ocean altimetry and tw...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://hdl.handle.net/10045/80028 https://doi.org/10.1029/2018JC014189 |
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ftunivalicante:oai:rua.ua.es:10045/80028 2023-05-15T14:04:56+02:00 Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements Yu, Y. Chao, Benjamin F. Garcia-Garcia, David Luo, Z. Universidad de Alicante. Departamento de Matemática Aplicada Geodesia Espacial y Dinámica Espacial 2018-07-23 http://hdl.handle.net/10045/80028 https://doi.org/10.1029/2018JC014189 eng eng Wiley https://doi.org/10.1029/2018JC014189 Journal of Geophysical Research: Oceans. 2018, 123(8): 5375-5387. doi:10.1029/2018JC014189 2169-9291 http://hdl.handle.net/10045/80028 doi:10.1029/2018JC014189 A9373565 © 2018 American Geophysical Union info:eu-repo/semantics/openAccess Time variable gravity GRACE Argentine gyre Altimetry Sea level Empirical orthogonal functions Matemática Aplicada info:eu-repo/semantics/article 2018 ftunivalicante https://doi.org/10.1029/2018JC014189 2020-06-05T13:19:50Z We investigate the nonseasonal and high‐frequency variations of the Argentine Gyre in the south Atlantic Ocean by analyzing the time‐variable gravity (TVG) measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission in conjunction with the satellite ocean altimetry and two ocean general circulation model outputs (GLORYS2V4 and ECCO V4R3). We solve the empirical orthogonal functions (EOF) and complex EOF and find good agreement between TVG and altimetry observations, confirming the barotropic structure of the Argentine Gyre. In particular, the leading EOF modes of the overall up‐and‐down undulation in TVG and altimetry variations are found to be in pace temporally with the Antarctic Oscillation Index with correlation as high as 0.69 at zero time shift. Furthermore, the leading complex EOF mode signifies a counterclockwise dipole pattern of ~25‐day periodicity within the overall gyre with multiscale amplitude modulation. The fact that GRACE does observe these signals, while the de‐aliasing background ocean model fails to, ascertains that GRACE data have adequate sensitivity to allow the detection of TVG signals at spatial and temporal resolutions higher than practiced hitherto. The ~25‐day oscillation is well recovered in the GLORYS2V4 ocean general circulation model, but not in ECCO V4R3. Our study demonstrates that satellite‐observed TVG fields can be useful in studying oceanographic gyres, particularly the polar gyres, that are not well observed by altimetry and in situ data. This work is supported by Taiwan Ministry of Science and Technology grants 105-2811-M-001-031 and 106-2116-M-001-013 and by National Nature Science Foundation of China grants 41474019, 41504014, and 41704012. Article in Journal/Newspaper Antarc* Antarctic South Atlantic Ocean RUA - Repositorio Institucional de la Universidad de Alicante Antarctic Argentine The Antarctic Journal of Geophysical Research: Oceans 123 8 5375 5387 |
institution |
Open Polar |
collection |
RUA - Repositorio Institucional de la Universidad de Alicante |
op_collection_id |
ftunivalicante |
language |
English |
topic |
Time variable gravity GRACE Argentine gyre Altimetry Sea level Empirical orthogonal functions Matemática Aplicada |
spellingShingle |
Time variable gravity GRACE Argentine gyre Altimetry Sea level Empirical orthogonal functions Matemática Aplicada Yu, Y. Chao, Benjamin F. Garcia-Garcia, David Luo, Z. Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements |
topic_facet |
Time variable gravity GRACE Argentine gyre Altimetry Sea level Empirical orthogonal functions Matemática Aplicada |
description |
We investigate the nonseasonal and high‐frequency variations of the Argentine Gyre in the south Atlantic Ocean by analyzing the time‐variable gravity (TVG) measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission in conjunction with the satellite ocean altimetry and two ocean general circulation model outputs (GLORYS2V4 and ECCO V4R3). We solve the empirical orthogonal functions (EOF) and complex EOF and find good agreement between TVG and altimetry observations, confirming the barotropic structure of the Argentine Gyre. In particular, the leading EOF modes of the overall up‐and‐down undulation in TVG and altimetry variations are found to be in pace temporally with the Antarctic Oscillation Index with correlation as high as 0.69 at zero time shift. Furthermore, the leading complex EOF mode signifies a counterclockwise dipole pattern of ~25‐day periodicity within the overall gyre with multiscale amplitude modulation. The fact that GRACE does observe these signals, while the de‐aliasing background ocean model fails to, ascertains that GRACE data have adequate sensitivity to allow the detection of TVG signals at spatial and temporal resolutions higher than practiced hitherto. The ~25‐day oscillation is well recovered in the GLORYS2V4 ocean general circulation model, but not in ECCO V4R3. Our study demonstrates that satellite‐observed TVG fields can be useful in studying oceanographic gyres, particularly the polar gyres, that are not well observed by altimetry and in situ data. This work is supported by Taiwan Ministry of Science and Technology grants 105-2811-M-001-031 and 106-2116-M-001-013 and by National Nature Science Foundation of China grants 41474019, 41504014, and 41704012. |
author2 |
Universidad de Alicante. Departamento de Matemática Aplicada Geodesia Espacial y Dinámica Espacial |
format |
Article in Journal/Newspaper |
author |
Yu, Y. Chao, Benjamin F. Garcia-Garcia, David Luo, Z. |
author_facet |
Yu, Y. Chao, Benjamin F. Garcia-Garcia, David Luo, Z. |
author_sort |
Yu, Y. |
title |
Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements |
title_short |
Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements |
title_full |
Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements |
title_fullStr |
Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements |
title_full_unstemmed |
Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements |
title_sort |
variations of the argentine gyre observed in the grace time‐variable gravity and ocean altimetry measurements |
publisher |
Wiley |
publishDate |
2018 |
url |
http://hdl.handle.net/10045/80028 https://doi.org/10.1029/2018JC014189 |
geographic |
Antarctic Argentine The Antarctic |
geographic_facet |
Antarctic Argentine The Antarctic |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_relation |
https://doi.org/10.1029/2018JC014189 Journal of Geophysical Research: Oceans. 2018, 123(8): 5375-5387. doi:10.1029/2018JC014189 2169-9291 http://hdl.handle.net/10045/80028 doi:10.1029/2018JC014189 A9373565 |
op_rights |
© 2018 American Geophysical Union info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018JC014189 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
8 |
container_start_page |
5375 |
op_container_end_page |
5387 |
_version_ |
1766276395974000640 |