Rafael R. Torres, Estefanía Giraldo, Cristian Muñoz, A. Caicedo, I. Hernández‐Carrasco, A. Orfila
{"title":"Seasonal and El Niño–Southern Oscillation-related ocean variability in the Panama Bight","authors":"Rafael R. Torres, Estefanía Giraldo, Cristian Muñoz, A. Caicedo, I. Hernández‐Carrasco, A. Orfila","doi":"10.5194/os-19-685-2023","DOIUrl":null,"url":null,"abstract":"Abstract. In the Panama Bight, two different seasonal surface circulation patterns\ncoincide with a strong mean sea level variation, as observed from 27 years\nof absolute dynamic topography (ADT) and the use of self-organizing maps.\nFrom January to April, a cyclonic gyre with a strong southwestward Panama\nJet Surface Current (PJSC) dominates the basin circulation, forced by the\nPanama surface wind jet that also produces upwelling, reducing sea surface\ntemperature (SST), increasing sea surface salinity (SSS) and causing an ADT\ndecrease. From June to December, the Choco surface wind jet enhances SST,\nprecipitation and river runoff, which reduces SSS, causing an ADT rise, which in turn forces a weak circulation in the bight, vanishing the PJSC. Interannual\nvariability in the region is strongly affected by El Niño–Southern Oscillation (ENSO); however this\nclimatic variability does not modify the seasonal circulation patterns in\nthe Panama Bight. In contrast, the positive (negative) ENSO phase increases\n(decreases) SST and ADT in the Panama Bight, with a mean annual difference\nof 0.9 ∘C and 9.6 cm, respectively, between the two conditions,\nwhile its effect on SSS is small. However, as the strong seasonal SST, SSS\nand ADT ranges are up to 2.2 ∘C, 2.59 g kg−1 and 28.3 cm,\nthe seasonal signal dominates over interannual variations in the bight.\n","PeriodicalId":19535,"journal":{"name":"Ocean Science","volume":"129 1","pages":""},"PeriodicalIF":4.1000,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ocean Science","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.5194/os-19-685-2023","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"METEOROLOGY & ATMOSPHERIC SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Abstract. In the Panama Bight, two different seasonal surface circulation patterns
coincide with a strong mean sea level variation, as observed from 27 years
of absolute dynamic topography (ADT) and the use of self-organizing maps.
From January to April, a cyclonic gyre with a strong southwestward Panama
Jet Surface Current (PJSC) dominates the basin circulation, forced by the
Panama surface wind jet that also produces upwelling, reducing sea surface
temperature (SST), increasing sea surface salinity (SSS) and causing an ADT
decrease. From June to December, the Choco surface wind jet enhances SST,
precipitation and river runoff, which reduces SSS, causing an ADT rise, which in turn forces a weak circulation in the bight, vanishing the PJSC. Interannual
variability in the region is strongly affected by El Niño–Southern Oscillation (ENSO); however this
climatic variability does not modify the seasonal circulation patterns in
the Panama Bight. In contrast, the positive (negative) ENSO phase increases
(decreases) SST and ADT in the Panama Bight, with a mean annual difference
of 0.9 ∘C and 9.6 cm, respectively, between the two conditions,
while its effect on SSS is small. However, as the strong seasonal SST, SSS
and ADT ranges are up to 2.2 ∘C, 2.59 g kg−1 and 28.3 cm,
the seasonal signal dominates over interannual variations in the bight.
期刊介绍:
Ocean Science (OS) is a not-for-profit international open-access scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of ocean science: experimental, theoretical, and laboratory. The primary objective is to publish a very high-quality scientific journal with free Internet-based access for researchers and other interested people throughout the world.
Electronic submission of articles is used to keep publication costs to a minimum. The costs will be covered by a moderate per-page charge paid by the authors. The peer-review process also makes use of the Internet. It includes an 8-week online discussion period with the original submitted manuscript and all comments. If accepted, the final revised paper will be published online.
Ocean Science covers the following fields: ocean physics (i.e. ocean structure, circulation, tides, and internal waves); ocean chemistry; biological oceanography; air–sea interactions; ocean models – physical, chemical, biological, and biochemical; coastal and shelf edge processes; paleooceanography.