Sea surface pC02 and carbon export during the Labrador Sea spring-summer bloom

An in situ mass balance approach

Todd R. Martz, Michael D. DeGrandpre, Peter G. Strutton, Wade R. McGillis, William M Drennan

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report depth-resolved in situ time series of the partial pressure of C02 (pC02) and other carbon-related parameters spanning the development and decline of a high-latitude phytoplankton bloom. A suite of sensors was deployed on a mooring in the Labrador Sea from June to August 2004. The study became quasi-Lagrangian when the mooring broke free in late June. Measured parameters included pC02, chlorophyll a fluorescence, beam c, optical backscatter, and photosynthetically active radiation. During the bloom, thepC02 was drawn down from 330 to 260 juatm, corresponding to a 70 /xmol kg-1 decrease of dissolved inorganic carbon (DIC). One-dimensional model results suggest that the observed drawdown was primarily driven by local processes and contributions from horizontal advection were minimal. A mass balance using the DIC and particulate organic carbon found that 47 mmol C m-2 d-1 of DIC was assimilated into biomass. The bloom biomass was not remineralized in the mixed layer but was rapidly exported below 35 m within 15 days of the bloom. As a consequence, the large air-sea pC02 gradient persisted, and approximately 30% of the DIC was regained through air-sea exchange by the end of the study. It is likely that all of the exported organic matter, corresponding to 5.4 ± 1.9 Tg of carbon, was replaced by atmospheric C02 prior to the onset of deep convective mixing.

Original languageEnglish (US)
Article numberC09008
JournalJournal of Geophysical Research C: Oceans
Volume114
Issue number9
DOIs
StatePublished - 2009

Fingerprint

Labrador
mass balance
dissolved inorganic carbon
surface pressure
summer
sea surface
algal bloom
Carbon
carbon
mooring
Mooring
biomass
air
Biomass
particulate organic carbon
photosynthetically active radiation
partial pressure
drawdown
backscatter
mixed layer

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Oceanography
  • Geochemistry and Petrology
  • Geophysics

Cite this

Sea surface pC02 and carbon export during the Labrador Sea spring-summer bloom : An in situ mass balance approach. / Martz, Todd R.; DeGrandpre, Michael D.; Strutton, Peter G.; McGillis, Wade R.; Drennan, William M.

In: Journal of Geophysical Research C: Oceans, Vol. 114, No. 9, C09008, 2009.

Research output: Contribution to journalArticle

@article{872583f614f24fcc9e4d5457317331fc,
title = "Sea surface pC02 and carbon export during the Labrador Sea spring-summer bloom: An in situ mass balance approach",
abstract = "We report depth-resolved in situ time series of the partial pressure of C02 (pC02) and other carbon-related parameters spanning the development and decline of a high-latitude phytoplankton bloom. A suite of sensors was deployed on a mooring in the Labrador Sea from June to August 2004. The study became quasi-Lagrangian when the mooring broke free in late June. Measured parameters included pC02, chlorophyll a fluorescence, beam c, optical backscatter, and photosynthetically active radiation. During the bloom, thepC02 was drawn down from 330 to 260 juatm, corresponding to a 70 /xmol kg-1 decrease of dissolved inorganic carbon (DIC). One-dimensional model results suggest that the observed drawdown was primarily driven by local processes and contributions from horizontal advection were minimal. A mass balance using the DIC and particulate organic carbon found that 47 mmol C m-2 d-1 of DIC was assimilated into biomass. The bloom biomass was not remineralized in the mixed layer but was rapidly exported below 35 m within 15 days of the bloom. As a consequence, the large air-sea pC02 gradient persisted, and approximately 30{\%} of the DIC was regained through air-sea exchange by the end of the study. It is likely that all of the exported organic matter, corresponding to 5.4 ± 1.9 Tg of carbon, was replaced by atmospheric C02 prior to the onset of deep convective mixing.",
author = "Martz, {Todd R.} and DeGrandpre, {Michael D.} and Strutton, {Peter G.} and McGillis, {Wade R.} and Drennan, {William M}",
year = "2009",
doi = "10.1029/2008JC005060",
language = "English (US)",
volume = "114",
journal = "Journal of Geophysical Research: Oceans",
issn = "2169-9275",
publisher = "Wiley-Blackwell",
number = "9",

}

TY - JOUR

T1 - Sea surface pC02 and carbon export during the Labrador Sea spring-summer bloom

T2 - An in situ mass balance approach

AU - Martz, Todd R.

AU - DeGrandpre, Michael D.

AU - Strutton, Peter G.

AU - McGillis, Wade R.

AU - Drennan, William M

PY - 2009

Y1 - 2009

N2 - We report depth-resolved in situ time series of the partial pressure of C02 (pC02) and other carbon-related parameters spanning the development and decline of a high-latitude phytoplankton bloom. A suite of sensors was deployed on a mooring in the Labrador Sea from June to August 2004. The study became quasi-Lagrangian when the mooring broke free in late June. Measured parameters included pC02, chlorophyll a fluorescence, beam c, optical backscatter, and photosynthetically active radiation. During the bloom, thepC02 was drawn down from 330 to 260 juatm, corresponding to a 70 /xmol kg-1 decrease of dissolved inorganic carbon (DIC). One-dimensional model results suggest that the observed drawdown was primarily driven by local processes and contributions from horizontal advection were minimal. A mass balance using the DIC and particulate organic carbon found that 47 mmol C m-2 d-1 of DIC was assimilated into biomass. The bloom biomass was not remineralized in the mixed layer but was rapidly exported below 35 m within 15 days of the bloom. As a consequence, the large air-sea pC02 gradient persisted, and approximately 30% of the DIC was regained through air-sea exchange by the end of the study. It is likely that all of the exported organic matter, corresponding to 5.4 ± 1.9 Tg of carbon, was replaced by atmospheric C02 prior to the onset of deep convective mixing.

AB - We report depth-resolved in situ time series of the partial pressure of C02 (pC02) and other carbon-related parameters spanning the development and decline of a high-latitude phytoplankton bloom. A suite of sensors was deployed on a mooring in the Labrador Sea from June to August 2004. The study became quasi-Lagrangian when the mooring broke free in late June. Measured parameters included pC02, chlorophyll a fluorescence, beam c, optical backscatter, and photosynthetically active radiation. During the bloom, thepC02 was drawn down from 330 to 260 juatm, corresponding to a 70 /xmol kg-1 decrease of dissolved inorganic carbon (DIC). One-dimensional model results suggest that the observed drawdown was primarily driven by local processes and contributions from horizontal advection were minimal. A mass balance using the DIC and particulate organic carbon found that 47 mmol C m-2 d-1 of DIC was assimilated into biomass. The bloom biomass was not remineralized in the mixed layer but was rapidly exported below 35 m within 15 days of the bloom. As a consequence, the large air-sea pC02 gradient persisted, and approximately 30% of the DIC was regained through air-sea exchange by the end of the study. It is likely that all of the exported organic matter, corresponding to 5.4 ± 1.9 Tg of carbon, was replaced by atmospheric C02 prior to the onset of deep convective mixing.

UR - http://www.scopus.com/inward/record.url?scp=72849149607&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=72849149607&partnerID=8YFLogxK

U2 - 10.1029/2008JC005060

DO - 10.1029/2008JC005060

M3 - Article

VL - 114

JO - Journal of Geophysical Research: Oceans

JF - Journal of Geophysical Research: Oceans

SN - 2169-9275

IS - 9

M1 - C09008

ER -