Variations of the stable isotopic compositions of rainfall events from the Cameroon rain forest, Central Africa
This paper discusses the factors controlling the variations of heavy isotope contents of 57 rain events collected throughout the rain forest regions of Cameroon, Central Africa, during the great rainy season (August–November) of 1994. Our data display a wide range of values, from +1.69 to −10.80‰ fo...
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description | This paper discusses the factors controlling the variations of heavy isotope contents of 57 rain events collected throughout the rain forest regions of Cameroon, Central Africa, during the great rainy season (August–November) of 1994. Our data display a wide range of values, from +1.69 to −10.80‰ for
18O and from +23.2 to −85.5‰ for
2H. The data follow closely the global meteoric water line suggesting that rain formation processes occurred under isotopic equilibrium conditions between both the condensate and the corresponding vapour. This also indicates that the observed heavy isotope contents have not been altered by evaporation during the descent of raindrops to the ground.
The low heavy-isotope contents observed for some precipitation events are assumed to be controlled by the amount of rainfall and/or by the low condensation temperature. The former effect is related to the northward passage of the intertropical convergence zone (ITCZ) over the region under study, whereas the second effect is linked to high altitudes of condensation. Moreover, the latitudinal variations of the weighted mean
18O contents indicates that in coastal areas (0–230
km inland from the Atlantic coast) the stable isotopic compositions of precipitation are controlled by a continuous extraction from the atmospheric reservoir of vapour as rains according to the Rayleigh distillation model, whereas at distances >230
km, recycling of continental moisture is thought to have influenced the isotopic compositions of rains. |
doi_str_mv | 10.1016/S0022-1694(99)00087-6 |
format | Article |
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18O and from +23.2 to −85.5‰ for
2H. The data follow closely the global meteoric water line suggesting that rain formation processes occurred under isotopic equilibrium conditions between both the condensate and the corresponding vapour. This also indicates that the observed heavy isotope contents have not been altered by evaporation during the descent of raindrops to the ground.
The low heavy-isotope contents observed for some precipitation events are assumed to be controlled by the amount of rainfall and/or by the low condensation temperature. The former effect is related to the northward passage of the intertropical convergence zone (ITCZ) over the region under study, whereas the second effect is linked to high altitudes of condensation. Moreover, the latitudinal variations of the weighted mean
18O contents indicates that in coastal areas (0–230
km inland from the Atlantic coast) the stable isotopic compositions of precipitation are controlled by a continuous extraction from the atmospheric reservoir of vapour as rains according to the Rayleigh distillation model, whereas at distances >230
km, recycling of continental moisture is thought to have influenced the isotopic compositions of rains.</description><identifier>ISSN: 0022-1694</identifier><identifier>EISSN: 1879-2707</identifier><identifier>DOI: 10.1016/S0022-1694(99)00087-6</identifier><identifier>CODEN: JHYDA7</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Africa rain forest ; Cameroon ; Deuterium ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Geochemistry ; Hydrology ; Hydrology. Hydrogeology ; Isotope geochemistry ; Isotope geochemistry. Geochronology ; Mineralogy ; Moisture recycling ; Oxygen-18 ; Rain events ; Silicates ; Stable isotopes ; Water geochemistry</subject><ispartof>Journal of hydrology (Amsterdam), 1999-09, Vol.223 (1), p.17-26</ispartof><rights>1999 Elsevier Science B.V.</rights><rights>1999 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a456t-471deb4ffa76d0b224a3693adafa5e0b003aca18c081eb218014fd4764e4fbd23</citedby><cites>FETCH-LOGICAL-a456t-471deb4ffa76d0b224a3693adafa5e0b003aca18c081eb218014fd4764e4fbd23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0022-1694(99)00087-6$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1929795$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Njitchoua, R.</creatorcontrib><creatorcontrib>Sigha-Nkamdjou, L.</creatorcontrib><creatorcontrib>Dever, L.</creatorcontrib><creatorcontrib>Marlin, C.</creatorcontrib><creatorcontrib>Sighomnou, D.</creatorcontrib><creatorcontrib>Nia, P.</creatorcontrib><title>Variations of the stable isotopic compositions of rainfall events from the Cameroon rain forest, Central Africa</title><title>Journal of hydrology (Amsterdam)</title><description>This paper discusses the factors controlling the variations of heavy isotope contents of 57 rain events collected throughout the rain forest regions of Cameroon, Central Africa, during the great rainy season (August–November) of 1994. Our data display a wide range of values, from +1.69 to −10.80‰ for
18O and from +23.2 to −85.5‰ for
2H. The data follow closely the global meteoric water line suggesting that rain formation processes occurred under isotopic equilibrium conditions between both the condensate and the corresponding vapour. This also indicates that the observed heavy isotope contents have not been altered by evaporation during the descent of raindrops to the ground.
The low heavy-isotope contents observed for some precipitation events are assumed to be controlled by the amount of rainfall and/or by the low condensation temperature. The former effect is related to the northward passage of the intertropical convergence zone (ITCZ) over the region under study, whereas the second effect is linked to high altitudes of condensation. Moreover, the latitudinal variations of the weighted mean
18O contents indicates that in coastal areas (0–230
km inland from the Atlantic coast) the stable isotopic compositions of precipitation are controlled by a continuous extraction from the atmospheric reservoir of vapour as rains according to the Rayleigh distillation model, whereas at distances >230
km, recycling of continental moisture is thought to have influenced the isotopic compositions of rains.</description><subject>Africa rain forest</subject><subject>Cameroon</subject><subject>Deuterium</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Geochemistry</subject><subject>Hydrology</subject><subject>Hydrology. Hydrogeology</subject><subject>Isotope geochemistry</subject><subject>Isotope geochemistry. Geochronology</subject><subject>Mineralogy</subject><subject>Moisture recycling</subject><subject>Oxygen-18</subject><subject>Rain events</subject><subject>Silicates</subject><subject>Stable isotopes</subject><subject>Water geochemistry</subject><issn>0022-1694</issn><issn>1879-2707</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqF0MtKLDEQBuAgCo6XRxCyOByOYGuSziSdlQyDNxBceNmG6nQFI92dMWkF3944I56lq2y-v6ryE3LE2SlnXJ3dMyZExZWR_4w5Zow1ulJbZMYbbSqhmd4msx-yS_ZyfimI1bWckfgEKcAU4php9HR6RponaHukIccproKjLg6rmMOPSRBGD31P8R3HKVOf4rAOLmHAFOO4FtTHhHk6ocuCEvR04VNwcEB2Sjbj4fe7Tx4vLx6W19Xt3dXNcnFbgZyrqZKad9hK70GrjrVCSKiVqaEDD3NkbbkeHPDGsYZjK3jDuPSd1Eqi9G0n6n3ydzN3leLrWznEDiE77HsYMb5ly7XQqja8wPkGuhRzTujtKoUB0oflzH7Va9f12q_urDF2Xa9VJffnewFkB71PMLqQ_4eNMNrMCzvfMCyffQ-YbHYBR4ddSOgm28Xwy6JPUO-Qpw</recordid><startdate>19990922</startdate><enddate>19990922</enddate><creator>Njitchoua, R.</creator><creator>Sigha-Nkamdjou, L.</creator><creator>Dever, L.</creator><creator>Marlin, C.</creator><creator>Sighomnou, D.</creator><creator>Nia, P.</creator><general>Elsevier B.V</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>C1K</scope></search><sort><creationdate>19990922</creationdate><title>Variations of the stable isotopic compositions of rainfall events from the Cameroon rain forest, Central Africa</title><author>Njitchoua, R. ; Sigha-Nkamdjou, L. ; Dever, L. ; Marlin, C. ; Sighomnou, D. ; Nia, P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a456t-471deb4ffa76d0b224a3693adafa5e0b003aca18c081eb218014fd4764e4fbd23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Africa rain forest</topic><topic>Cameroon</topic><topic>Deuterium</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Geochemistry</topic><topic>Hydrology</topic><topic>Hydrology. Hydrogeology</topic><topic>Isotope geochemistry</topic><topic>Isotope geochemistry. Geochronology</topic><topic>Mineralogy</topic><topic>Moisture recycling</topic><topic>Oxygen-18</topic><topic>Rain events</topic><topic>Silicates</topic><topic>Stable isotopes</topic><topic>Water geochemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Njitchoua, R.</creatorcontrib><creatorcontrib>Sigha-Nkamdjou, L.</creatorcontrib><creatorcontrib>Dever, L.</creatorcontrib><creatorcontrib>Marlin, C.</creatorcontrib><creatorcontrib>Sighomnou, D.</creatorcontrib><creatorcontrib>Nia, P.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Journal of hydrology (Amsterdam)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Njitchoua, R.</au><au>Sigha-Nkamdjou, L.</au><au>Dever, L.</au><au>Marlin, C.</au><au>Sighomnou, D.</au><au>Nia, P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Variations of the stable isotopic compositions of rainfall events from the Cameroon rain forest, Central Africa</atitle><jtitle>Journal of hydrology (Amsterdam)</jtitle><date>1999-09-22</date><risdate>1999</risdate><volume>223</volume><issue>1</issue><spage>17</spage><epage>26</epage><pages>17-26</pages><issn>0022-1694</issn><eissn>1879-2707</eissn><coden>JHYDA7</coden><abstract>This paper discusses the factors controlling the variations of heavy isotope contents of 57 rain events collected throughout the rain forest regions of Cameroon, Central Africa, during the great rainy season (August–November) of 1994. Our data display a wide range of values, from +1.69 to −10.80‰ for
18O and from +23.2 to −85.5‰ for
2H. The data follow closely the global meteoric water line suggesting that rain formation processes occurred under isotopic equilibrium conditions between both the condensate and the corresponding vapour. This also indicates that the observed heavy isotope contents have not been altered by evaporation during the descent of raindrops to the ground.
The low heavy-isotope contents observed for some precipitation events are assumed to be controlled by the amount of rainfall and/or by the low condensation temperature. The former effect is related to the northward passage of the intertropical convergence zone (ITCZ) over the region under study, whereas the second effect is linked to high altitudes of condensation. Moreover, the latitudinal variations of the weighted mean
18O contents indicates that in coastal areas (0–230
km inland from the Atlantic coast) the stable isotopic compositions of precipitation are controlled by a continuous extraction from the atmospheric reservoir of vapour as rains according to the Rayleigh distillation model, whereas at distances >230
km, recycling of continental moisture is thought to have influenced the isotopic compositions of rains.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/S0022-1694(99)00087-6</doi><tpages>10</tpages></addata></record> |
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subjects | Africa rain forest Cameroon Deuterium Earth sciences Earth, ocean, space Exact sciences and technology Geochemistry Hydrology Hydrology. Hydrogeology Isotope geochemistry Isotope geochemistry. Geochronology Mineralogy Moisture recycling Oxygen-18 Rain events Silicates Stable isotopes Water geochemistry |
title | Variations of the stable isotopic compositions of rainfall events from the Cameroon rain forest, Central Africa |
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