| dc.creator | Crawford, David W. | |
| dc.creator | Wyatt, Shea N. | |
| dc.creator | Wrohan, Ian A. | |
| dc.creator | Cefarelli, Adrián Oscar | |
| dc.creator | Giesbrecht, Karina E. | |
| dc.creator | Kelly, Brianne | |
| dc.creator | Varela, Diana E. | |
| dc.date | 2015-12-05 | |
| dc.date | 2022-11-16T16:23:42Z | |
| dc.date.accessioned | 2023-07-15T05:03:31Z | |
| dc.date.available | 2023-07-15T05:03:31Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/145939 | |
| dc.identifier | issn:0886-6236 | |
| dc.identifier | issn:1944-9224 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7471926 | |
| dc.description | During the Canada Three Oceans and Joint Ocean Ice Study projects in the summers of 2007 and 2008, we measured particulate organic carbon to nitrogen ratios (POC:PON) throughout the euphotic zone in subarctic and arctic waters. Depth-integrated values averaged 2.65 (±0.19) in the Beaufort Sea and Canada Basin (BS-CB domain), and were much lower than both the Redfield ratio (6.6) and the average ratios (3.9 to 5.6) measured across other arctic-subarctic domains. Average uptake ratios of C and N (ρC:ρN) were also lower (0.87±0.14) in BS-CB than in the other four domains (2.10 to 3.51). Decreasing POC:PON ratios were associated with low concentrations of phytoplankton C, reduced abundance of biogenic silica (bSiO2), a smaller relative contribution of the >5 µm fraction to total chlorophyll a and a larger relative contribution of small flagellates (<8 µm) to phytoplankton C. In the subsurface chlorophyll a maximum (SCM) within the BS-CB domain, phytoplankton C represented only ~13% of POC, and therefore low POC:PON may be influenced by the presence of heterotrophic microbes. These ratios are supported by data obtained during other arctic programs in 2006, 2008 and 2009. Previous work has suggested a link between freshening of surface waters and increasing dominance of picophytoplankton and bacterioplankton in the Canada Basin, and the low POC:PON ratios measured during this study may be a consequence of this shift. Our results have ramifications for the conversion between C- and N-based estimates of primary productivity, and for biogeochemical modeling of marine arctic waters. | |
| dc.description | Facultad de Ciencias Naturales y Museo | |
| dc.format | application/pdf | |
| dc.format | 2021-2033 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Biología | |
| dc.subject | C:N ratios | |
| dc.subject | Redfield ratios | |
| dc.subject | Particulates | |
| dc.subject | Uptake rates | |
| dc.subject | Phytoplankton | |
| dc.subject | Arctic | |
| dc.title | Low particulate carbon to nitrogen ratios in marine surface waters of the Arctic | |
| dc.type | Articulo | |
| dc.type | Articulo | |
