Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies
A central question addressed by the VERtical Transport In the Global Ocean (VERTIGO) study was What controls the efficiency of particle export between the surface and subsurface ocean? Here, we present data from sites at ALOHA (N Central Pacific Gyre) and K2 (NW subarctic Pacific) on phytoplankton p...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://doi.org/10.1016/j.dsr2.2008.04.010 http://ecite.utas.edu.au/95542 |
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ftunivtasecite:oai:ecite.utas.edu.au:95542 2023-05-15T18:28:38+02:00 Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies Boyd, PW Gall, MP Silver, MW Coale, SL Bidigare, RR Bishop, JLKB 2008 https://doi.org/10.1016/j.dsr2.2008.04.010 http://ecite.utas.edu.au/95542 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr2.2008.04.010 Boyd, PW and Gall, MP and Silver, MW and Coale, SL and Bidigare, RR and Bishop, JLKB, Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies, Deep-Sea Research Part 2, 55, (14-15) pp. 1578-1593. ISSN 0967-0645 (2008) [Refereed Article] http://ecite.utas.edu.au/95542 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.1016/j.dsr2.2008.04.010 2019-12-13T21:57:57Z A central question addressed by the VERtical Transport In the Global Ocean (VERTIGO) study was What controls the efficiency of particle export between the surface and subsurface ocean? Here, we present data from sites at ALOHA (N Central Pacific Gyre) and K2 (NW subarctic Pacific) on phytoplankton processes, and relate them via a simple planktonic foodweb model, to subsurface particle export (150500 m). Three key factors enable quantification of the surfacesubsurface coupling: a sampling design to overcome the temporal lag and spatial displacement between surface and subsurface processes; data on the size partitioning of net primary production (NPP) and subsequent transformations prior to export; estimates of the ratio of algal- to faecal-mediated vertical export flux. At ALOHA, phytoplankton were characterized by low stocks, NPP, F v / F m (N-limited), and were dominated by picoplankton. The HNLC waters at K2 were characterized by both two-fold changes in NPP and floristic shifts (high to low proportion of diatoms) between deployment 1 and 2. Prediction of export exiting the euphotic zone was based on size partitioning of NPP, a copepod-dominated foodweb and a ratio of 0.2 (ALOHA) and 0.1 (K2) for algal:faecal particle flux. Predicted export was 2022 mg POC m −2 d −1 at ALOHA (i.e. 1011% NPP (0125 m); 1.11.2export flux at 150 m ( E 150 ). At K2, export was 111 mg C m −2 d −1 (21% NPP (050 m); 1.8 E 150 ) and 33 mg POC m −2 d −1 (11% NPP, 055 m); 1.4 E 150 ) for deployments 1 and 2, respectively. This decrease in predicted export at K2 matches the observed trend for E 150 . Also, the low attenuation of export flux from 60 to 150 m is consistent with that between 150 and 500 m. This strong surfacesubsurface coupling suggests that phytoplankton productivity and floristics play a key role at K2 in setting export flux, and moreover that pelagic particle transformations by grazers strongly influence to what extent sinking particles are further broken down in the underlying waters of the Twilight Zone. Article in Journal/Newspaper Subarctic eCite UTAS (University of Tasmania) Pacific Deep Sea Research Part II: Topical Studies in Oceanography 55 14-15 1578 1593 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Boyd, PW Gall, MP Silver, MW Coale, SL Bidigare, RR Bishop, JLKB Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
A central question addressed by the VERtical Transport In the Global Ocean (VERTIGO) study was What controls the efficiency of particle export between the surface and subsurface ocean? Here, we present data from sites at ALOHA (N Central Pacific Gyre) and K2 (NW subarctic Pacific) on phytoplankton processes, and relate them via a simple planktonic foodweb model, to subsurface particle export (150500 m). Three key factors enable quantification of the surfacesubsurface coupling: a sampling design to overcome the temporal lag and spatial displacement between surface and subsurface processes; data on the size partitioning of net primary production (NPP) and subsequent transformations prior to export; estimates of the ratio of algal- to faecal-mediated vertical export flux. At ALOHA, phytoplankton were characterized by low stocks, NPP, F v / F m (N-limited), and were dominated by picoplankton. The HNLC waters at K2 were characterized by both two-fold changes in NPP and floristic shifts (high to low proportion of diatoms) between deployment 1 and 2. Prediction of export exiting the euphotic zone was based on size partitioning of NPP, a copepod-dominated foodweb and a ratio of 0.2 (ALOHA) and 0.1 (K2) for algal:faecal particle flux. Predicted export was 2022 mg POC m −2 d −1 at ALOHA (i.e. 1011% NPP (0125 m); 1.11.2export flux at 150 m ( E 150 ). At K2, export was 111 mg C m −2 d −1 (21% NPP (050 m); 1.8 E 150 ) and 33 mg POC m −2 d −1 (11% NPP, 055 m); 1.4 E 150 ) for deployments 1 and 2, respectively. This decrease in predicted export at K2 matches the observed trend for E 150 . Also, the low attenuation of export flux from 60 to 150 m is consistent with that between 150 and 500 m. This strong surfacesubsurface coupling suggests that phytoplankton productivity and floristics play a key role at K2 in setting export flux, and moreover that pelagic particle transformations by grazers strongly influence to what extent sinking particles are further broken down in the underlying waters of the Twilight Zone. |
format |
Article in Journal/Newspaper |
author |
Boyd, PW Gall, MP Silver, MW Coale, SL Bidigare, RR Bishop, JLKB |
author_facet |
Boyd, PW Gall, MP Silver, MW Coale, SL Bidigare, RR Bishop, JLKB |
author_sort |
Boyd, PW |
title |
Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies |
title_short |
Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies |
title_full |
Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies |
title_fullStr |
Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies |
title_full_unstemmed |
Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies |
title_sort |
quantifying the surface- subsurface biogeochemical coupling during the vertigo aloha and k2 studies |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2008 |
url |
https://doi.org/10.1016/j.dsr2.2008.04.010 http://ecite.utas.edu.au/95542 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
http://dx.doi.org/10.1016/j.dsr2.2008.04.010 Boyd, PW and Gall, MP and Silver, MW and Coale, SL and Bidigare, RR and Bishop, JLKB, Quantifying the surface- subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies, Deep-Sea Research Part 2, 55, (14-15) pp. 1578-1593. ISSN 0967-0645 (2008) [Refereed Article] http://ecite.utas.edu.au/95542 |
op_doi |
https://doi.org/10.1016/j.dsr2.2008.04.010 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
14-15 |
container_start_page |
1578 |
op_container_end_page |
1593 |
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1766211192548753408 |