| Title: |
Cirene: Air-Sea Interactions in the Seychelles-Chagos Thermocline Ridge Region |
| Authors: |
Vialard, Jérôme; Duvel, Jean-Philippe; Mcphaden, Michael J.; Bouruet-Aubertot, Pascale; Ward, Brian; Key, Erica; Bourras, Denis; Weller, R.; Minnett, P. J.; Weill, Alain; Cassou, Christophe; Eymard, Laurence; Fristedt, T.; Basdevant, Claude; Dandonneau, Yves; Duteil, Olaf; Izumo, Takeshi; de Boyer Montégut, Clément; Masson, Sébastien; Marsac, F.; Menkès, Christophe E.; Kennan, Sean C. |
| Contributors: |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN); Institut Pierre-Simon-Laplace (IPSL); École normale supérieure - Paris (ENS-PSL); Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS); Laboratoire de Météorologie Dynamique (UMR 8539) (LMD); Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-École nationale des ponts et chaussées (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS-PSL; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL); Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL); NOAA Pacific Marine Environmental Laboratory Newport (PMEL); National Oceanic and Atmospheric Administration (NOAA); Old Dominion University Norfolk (ODU); ESTER - LATMOS; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS); Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS); Woods Hole Oceanographic Institution (WHOI); University of Miami Coral Gables; Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS); Swedish Defence Research Agency Stockholm (FOI); Frontier Research Center for Global Change (FRCGC); Japan Agency for Marine-Earth Science and Technology (JAMSTEC); Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation (THETIS); National Institute of Water and Atmospheric Research Wellington (NIWA) |
| Source: |
ISSN: 0003-0007. |
| Publisher Information: |
CCSD; American Meteorological Society |
| Publication Year: |
2009 |
| Subject Terms: |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
| Description: |
International audience ; The Vasco–Cirene program explores how strong air–sea interactions promoted by the shallow thermocline and high sea surface temperature in the Seychelles–Chagos thermocline ridge results in marked variability at synoptic, intraseasonal, and interannual time scales. The Cirene oceanographic cruise collected oceanic, atmospheric, and air–sea flux observations in this region in January–February 2007. The contemporaneous Vasco field experiment complemented these measurements with balloon deployments from the Seychelles. Cirene also contributed to the development of the Indian Ocean observing system via deployment of a moor-ing and 12 Argo profilers.Unusual conditions prevailed in the Indian Ocean during January and February 2007, following the Indian Ocean dipole climate anomaly of late 2006. Cirene measurements show that the Seychelles–Chagos thermocline ridge had higher-than-usual heat content with subsurface anomalies up to 7°C. The ocean surface was warmer and fresher than average, and unusual eastward currents prevailed down to 800 m. These anomalous conditions had a major impact on tuna fishing in early 2007. Our dataset also sampled the genesis and maturation of Tropical Cyclone Dora, including high surface temperatures and a strong diurnal cycle before the cyclone, followed by a 1.5°C cooling over 10 days. Balloonborne instruments sampled the surface and boundary layer dynamics of Dora. We observed small-scale structures like dry-air layers in the atmosphere and diurnal warm layers in the near-surface ocean. The Cirene data will quantify the impact of these finescale features on the upper-ocean heat budget and atmospheric deep convection. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
IRD: fdi:010044310; WOS: 000263596600009 |
| DOI: |
10.1175/2008BAMS2499.1 |
| Availability: |
https://hal.science/hal-00361422; https://hal.science/hal-00361422v1/document; https://hal.science/hal-00361422v1/file/2008bams2499.1.pdf; https://doi.org/10.1175/2008BAMS2499.1 |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.8650FFCA |
| Database: |
BASE |