A very oligotrophic zone observed from space in the equatorial Pacific warm pool
The analysis of the SeaWiFS chlorophyll archive shows a quasi-persistent strip of oligotrophic waters (chl
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| Veröffentlicht in: | Remote sensing of environment 2013-07, Vol.134, p.224-233 |
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| creator | Radenac, Marie-Hélène Messié, Monique Léger, Fabien Bosc, Christelle |
| description | The analysis of the SeaWiFS chlorophyll archive shows a quasi-persistent strip of oligotrophic waters (chl |
| doi_str_mv | 10.1016/j.rse.2013.03.007 |
| format | Article |
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•Analysis of surface chlorophyll changes in the western Pacific warm pool.•Quasi-persistent oligotrophic waters in the east of the equatorial warm pool•Moderate mesotrophic waters in the west of the warm pool when wind is westerly•Intraseasonal and seasonal variations of the western limit of oligotrophic waters•We propose mechanisms to explain the persistence of oligotrophic waters.</description><identifier>ISSN: 0034-4257</identifier><identifier>EISSN: 1879-0704</identifier><identifier>DOI: 10.1016/j.rse.2013.03.007</identifier><identifier>CODEN: RSEEA7</identifier><language>eng</language><publisher>New York, NY: Elsevier Inc</publisher><subject>Animal, plant and microbial ecology ; Applied geophysics ; Biological and medical sciences ; Earth sciences ; Earth, ocean, space ; ENSO ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; General aspects. Techniques ; Internal geophysics ; Intraseasonal variability ; Ocean, Atmosphere ; Oligotrophic and mesotrophic ecosystems ; Sciences of the Universe ; Space-borne data ; Surface chlorophyll concentration ; Teledetection and vegetation maps ; Western equatorial Pacific warm pool</subject><ispartof>Remote sensing of environment, 2013-07, Vol.134, p.224-233</ispartof><rights>2013 Elsevier Inc.</rights><rights>2014 INIST-CNRS</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c404t-caa790dd0a61410d8b6cb4b042e6c6907ed068afb8ce345031b3f3f7f53a22ad3</citedby><cites>FETCH-LOGICAL-c404t-caa790dd0a61410d8b6cb4b042e6c6907ed068afb8ce345031b3f3f7f53a22ad3</cites><orcidid>0000-0002-4985-3413</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.rse.2013.03.007$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,780,784,885,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27312420$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://hal.science/hal-00996355$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Radenac, Marie-Hélène</creatorcontrib><creatorcontrib>Messié, Monique</creatorcontrib><creatorcontrib>Léger, Fabien</creatorcontrib><creatorcontrib>Bosc, Christelle</creatorcontrib><title>A very oligotrophic zone observed from space in the equatorial Pacific warm pool</title><title>Remote sensing of environment</title><description>The analysis of the SeaWiFS chlorophyll archive shows a quasi-persistent strip of oligotrophic waters (chl<0.1mgm−3) extending over about 20° longitude in the eastern part of the equatorial Pacific warm pool. Other space-borne data sets (scatterometric wind, microwave sea surface temperature (SST), altimetric sea level, and surface currents) were used together with barrier layer thickness derived from Argo floats to investigate the variability of the oligotrophic zone and of its eastern and western boundaries, and to propose processes that could explain why surface chlorophyll is so low in this region. The eastern limit of the oligotrophic waters matches the eastern edge of the warm pool and moves zonally both at seasonal time scale and with the El Niño/La Niña phases whereas the western limit moves mostly at intraseasonal and interannual time scales. On average, about half of the surface of the zone is occupied by very oligotrophic waters (chl<0.07mgm−3) located in the eastern part. The degree of oligotrophy of the zone increases when its width is maximum during boreal fall and winter and during El Niño events. Oligotrophy in the eastern part of the warm pool most likely persists because of the lack of vertical or horizontal penetration of nutrient-rich water due to the following processes. 1/ The equatorial oligotrophic warm pool is bounded poleward by the oligotrophic subtropical gyres. 2/ The deep nutrient pool prevents strong vertical nutrient inputs into the euphotic layer and the barrier layer above it potentially reduces the efficiency of mixing. 3/ During westerly wind events, mesotrophic waters in the far western basin are too distant from the oligotrophic zone to be efficient nutrient and phytoplankton sources, and become nutrient and phytoplankton depleted during their eastward advection. 4/ Nutrient-rich waters from the central basin and nutrient-poor surface waters of the warm pool do not blend because of subduction at the eastern limit of the oligotrophic zone.
•Analysis of surface chlorophyll changes in the western Pacific warm pool.•Quasi-persistent oligotrophic waters in the east of the equatorial warm pool•Moderate mesotrophic waters in the west of the warm pool when wind is westerly•Intraseasonal and seasonal variations of the western limit of oligotrophic waters•We propose mechanisms to explain the persistence of oligotrophic waters.</description><subject>Animal, plant and microbial ecology</subject><subject>Applied geophysics</subject><subject>Biological and medical sciences</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>ENSO</subject><subject>Exact sciences and technology</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>General aspects. Techniques</subject><subject>Internal geophysics</subject><subject>Intraseasonal variability</subject><subject>Ocean, Atmosphere</subject><subject>Oligotrophic and mesotrophic ecosystems</subject><subject>Sciences of the Universe</subject><subject>Space-borne data</subject><subject>Surface chlorophyll concentration</subject><subject>Teledetection and vegetation maps</subject><subject>Western equatorial Pacific warm pool</subject><issn>0034-4257</issn><issn>1879-0704</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LxDAQhoMouH78AG-5ePDQddKkTYunRdQVFvSg5zBNJ26W7qYmdUV_vV1WPAoDA8PzzDAvYxcCpgJEeb2axkTTHIScwligD9hEVLrOQIM6ZBMAqTKVF_qYnaS0AhBFpcWEPc_4luIXD51_C0MM_dJb_h02xEOTKG6p5S6GNU89WuJ-w4clcXr_wCFEjx1_RuvdqHxiXPM-hO6MHTnsEp3_9lP2en_3cjvPFk8Pj7ezRWYVqCGziLqGtgUshRLQVk1pG9WAyqm0ZQ2aWigrdE1lSaoCpGikk067QmKeYytP2dV-7xI700e_xvhlAnozny3MbgZQ16Usiq0YWbFnbQwpRXJ_ggCzi8-szBif2cVnYCzQo3O5d3pMFjsXcWN9-hNzLUWuchi5mz1H47NbT9Ek62ljqfWR7GDa4P-58gP7o4Te</recordid><startdate>20130701</startdate><enddate>20130701</enddate><creator>Radenac, Marie-Hélène</creator><creator>Messié, Monique</creator><creator>Léger, Fabien</creator><creator>Bosc, Christelle</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-4985-3413</orcidid></search><sort><creationdate>20130701</creationdate><title>A very oligotrophic zone observed from space in the equatorial Pacific warm pool</title><author>Radenac, Marie-Hélène ; Messié, Monique ; Léger, Fabien ; Bosc, Christelle</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c404t-caa790dd0a61410d8b6cb4b042e6c6907ed068afb8ce345031b3f3f7f53a22ad3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Animal, plant and microbial ecology</topic><topic>Applied geophysics</topic><topic>Biological and medical sciences</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>ENSO</topic><topic>Exact sciences and technology</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>General aspects. Techniques</topic><topic>Internal geophysics</topic><topic>Intraseasonal variability</topic><topic>Ocean, Atmosphere</topic><topic>Oligotrophic and mesotrophic ecosystems</topic><topic>Sciences of the Universe</topic><topic>Space-borne data</topic><topic>Surface chlorophyll concentration</topic><topic>Teledetection and vegetation maps</topic><topic>Western equatorial Pacific warm pool</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Radenac, Marie-Hélène</creatorcontrib><creatorcontrib>Messié, Monique</creatorcontrib><creatorcontrib>Léger, Fabien</creatorcontrib><creatorcontrib>Bosc, Christelle</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Remote sensing of environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Radenac, Marie-Hélène</au><au>Messié, Monique</au><au>Léger, Fabien</au><au>Bosc, Christelle</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A very oligotrophic zone observed from space in the equatorial Pacific warm pool</atitle><jtitle>Remote sensing of environment</jtitle><date>2013-07-01</date><risdate>2013</risdate><volume>134</volume><spage>224</spage><epage>233</epage><pages>224-233</pages><issn>0034-4257</issn><eissn>1879-0704</eissn><coden>RSEEA7</coden><abstract>The analysis of the SeaWiFS chlorophyll archive shows a quasi-persistent strip of oligotrophic waters (chl<0.1mgm−3) extending over about 20° longitude in the eastern part of the equatorial Pacific warm pool. Other space-borne data sets (scatterometric wind, microwave sea surface temperature (SST), altimetric sea level, and surface currents) were used together with barrier layer thickness derived from Argo floats to investigate the variability of the oligotrophic zone and of its eastern and western boundaries, and to propose processes that could explain why surface chlorophyll is so low in this region. The eastern limit of the oligotrophic waters matches the eastern edge of the warm pool and moves zonally both at seasonal time scale and with the El Niño/La Niña phases whereas the western limit moves mostly at intraseasonal and interannual time scales. On average, about half of the surface of the zone is occupied by very oligotrophic waters (chl<0.07mgm−3) located in the eastern part. The degree of oligotrophy of the zone increases when its width is maximum during boreal fall and winter and during El Niño events. Oligotrophy in the eastern part of the warm pool most likely persists because of the lack of vertical or horizontal penetration of nutrient-rich water due to the following processes. 1/ The equatorial oligotrophic warm pool is bounded poleward by the oligotrophic subtropical gyres. 2/ The deep nutrient pool prevents strong vertical nutrient inputs into the euphotic layer and the barrier layer above it potentially reduces the efficiency of mixing. 3/ During westerly wind events, mesotrophic waters in the far western basin are too distant from the oligotrophic zone to be efficient nutrient and phytoplankton sources, and become nutrient and phytoplankton depleted during their eastward advection. 4/ Nutrient-rich waters from the central basin and nutrient-poor surface waters of the warm pool do not blend because of subduction at the eastern limit of the oligotrophic zone.
•Analysis of surface chlorophyll changes in the western Pacific warm pool.•Quasi-persistent oligotrophic waters in the east of the equatorial warm pool•Moderate mesotrophic waters in the west of the warm pool when wind is westerly•Intraseasonal and seasonal variations of the western limit of oligotrophic waters•We propose mechanisms to explain the persistence of oligotrophic waters.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><doi>10.1016/j.rse.2013.03.007</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-4985-3413</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Animal, plant and microbial ecology Applied geophysics Biological and medical sciences Earth sciences Earth, ocean, space ENSO Exact sciences and technology Fundamental and applied biological sciences. Psychology General aspects. Techniques Internal geophysics Intraseasonal variability Ocean, Atmosphere Oligotrophic and mesotrophic ecosystems Sciences of the Universe Space-borne data Surface chlorophyll concentration Teledetection and vegetation maps Western equatorial Pacific warm pool |
| title | A very oligotrophic zone observed from space in the equatorial Pacific warm pool |
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