FN Archimer Export Format
PT J
TI Could old tide gauges help estimate past atmospheric variability?
BT 
AF Platzer, Paul
   Tandeo, Pierre
   Ailliot, Pierre
   Chapron, Bertrand
AS 1:1;2:2,3,4;3:5;4:1,3;
FF 1:PDG-ODE-LOPS-SIAM;2:;3:;4:PDG-ODE-LOPS-SIAM;
C1 Laboratoire d’Océanographie Physique et Spatiale, Centre National de la Recherche Scientifique – Ifremer, Plouzané, France
   IMT Atlantique, Lab-STICC, UMR CNRS 6285, 29238, Brest, France
   Odyssey, Inria/IMT/CNRS, Rennes, France
   RIKEN Center for Computational Science, Kobe, 650-0047, Japan
   Laboratoire de Mathematiques de Bretagne Atlantique, Univ Brest, UMR CNRS 6205, Brest, France
C2 IFREMER, FRANCE
   IMT ATLANTIQUE, FRANCE
   INRIA, FRANCE
   RIKEN CCS, JAPAN
   UBO, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN DOAJ
TC 0
UR https://archimer.ifremer.fr/doc/00878/99028/108814.pdf
LA English
DT Article
AB The storm surge is the non-tidal component of coastal sea-level. It responds to the atmosphere both through the direct effect of atmospheric pressure on the sea-surface, and through Ekman transport induced by wind-stress. Tide gauges have been used to measure the sea-level in coastal cities for centuries, with many records dating back to the 19th-century or even further, at times when direct pressure observations were scarce. Therefore, these old tide gauge records may be used as indirect observations of sub-seasonal atmospheric variability, complementary to other sensors such as barometers. To investigate this claim, the present work relies on tide gauge records of Brest and Saint-Nazaire, two portal cities in western France, and on the members of NOAA's 20th-century reanalysis (20CRv3) which only assimilates surface pressure observations and uses numerical weather prediction model. Using simple statistical relationships between storm surges and pressure maps, we show that the tide gauge records reveal part of the 19th-century atmospheric variability that was uncaught by the pressure-observations-based reanalysis. In particular, weighing the 80 reanalysis members based on tide gauge observations indicates that a large number of members are very unlikely, which induces corrections of several tens of Hectopascals in the Bay of Biscay. These findings support the use of early tide gauge records in sensor-scarce areas, both to validate old atmospheric reanalyses and to better probe old atmospheric sub-seasonal variability. 
PY 2024
PD JAN
SO Egusphere/Climate of the Past
PU Copernicus GmbH
DI 10.5194/egusphere-2023-2997
ID 99028
ER

EF