{"title":"Regional Patterns of Organic Matter Export Rates Along the GEOTRACES Pacific Meridional Transect GP15","authors":"Paul Quay, Mark Stephens","doi":"10.1029/2024GB008277","DOIUrl":null,"url":null,"abstract":"<p>Export rates of organic matter (OM) were determined based on PO<sub>4</sub><sup>3−</sup>, NO<sub>3</sub><sup>−</sup> and O<sub>2</sub> budgets during GEOTRACES cruise GP15 in the Pacific Ocean that crossed subpolar, subtropical and equatorial regimes. Lowest OM export rates at 3–5 mmol C/m<sup>2</sup>/yr were found in the subtropical regions and highest rates at 9–12 mmol C/m<sup>2</sup>/yr were found in the equatorial and subpolar regions. Satellite based OM export rates showed similar regional trends but with a significantly larger range. The budget and satellite-based OM export rates were 3–15× higher than estimates of particle loss rates based on <sup>234</sup>Th and sediment trap collections, with the differences primarily due to non-particle forms of OM export and different integration times of methods. The efficiency of export varied from 0.1 to 0.3, with the lowest efficiencies in the subtropics and highest efficiencies in the subpolar and equatorial regions.</p>","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"39 2","pages":""},"PeriodicalIF":5.4000,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global Biogeochemical Cycles","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024GB008277","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Export rates of organic matter (OM) were determined based on PO43−, NO3− and O2 budgets during GEOTRACES cruise GP15 in the Pacific Ocean that crossed subpolar, subtropical and equatorial regimes. Lowest OM export rates at 3–5 mmol C/m2/yr were found in the subtropical regions and highest rates at 9–12 mmol C/m2/yr were found in the equatorial and subpolar regions. Satellite based OM export rates showed similar regional trends but with a significantly larger range. The budget and satellite-based OM export rates were 3–15× higher than estimates of particle loss rates based on 234Th and sediment trap collections, with the differences primarily due to non-particle forms of OM export and different integration times of methods. The efficiency of export varied from 0.1 to 0.3, with the lowest efficiencies in the subtropics and highest efficiencies in the subpolar and equatorial regions.
期刊介绍：
Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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