Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific

V. Puigcorbé, C.R. Benitez-Nelson, Pere Masque, E. Verdeny, A.E. White, B.N. Popp, F.G. Prahl, P.J. Lam

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

©2015. American Geophysical Union. All Rights Reserved. Summertime carbon, nitrogen, and biogenic silica export was examined using 234Th:238U disequilibria combined with free floating sediment traps and fine scale water column sampling with in situ pumps (ISP) within the Eastern Tropical North Pacific and the Gulf of California. Fine scale ISP sampling provides evidence that in this system, particulate carbon (PC) and particulate nitrogen (PN) concentrations were more rapidly attenuated relative to 234Th activities in small particles compared to large particles, converging to 1-5 μmol dpm-1 by 100 m. Comparison of elemental particle composition, coupled with particle size distribution analysis, suggests that small particles are major contributors to particle flux. While absolute PC and PN export rates were dependent on the method used to obtain the element/234Th ratio, regional trends were consistent across measurement techniques. The highest C fixation rates were associated with diatom-dominated surface waters. Yet, the highest export efficiencies occurred in picoplankton-dominated surface waters, where relative concentrations of diazotrophs were also elevated. Our results add to the increasing body of literature that picoplankton- and diazotroph-dominated food webs in subtropical regions can be characterized by enhanced export efficiencies relative to food webs dominated by larger phytoplankton, e.g., diatoms, in low productivity pico/nanoplankton-dominated regions, where small particles are major contributors to particle export. Findings from this region are compared globally and provide insights into the efficiency of downward particle transport of carbon and associated nutrients in a warmer ocean where picoplankton and diazotrophs may dominate. Therefore, we argue the necessity of collecting multiple particle sizes used to convert 234Th fluxes into carbon or other elemental fluxes, including
Original languageEnglish
Pages (from-to)1309-1332
JournalGlobal Biogeochemical Cycles
Volume29
Issue number8
DOIs
Publication statusPublished - 2015

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Phytoplankton
Nutrients
Carbon
phytoplankton
nutrient
carbon
Nitrogen
Fluxes
picoplankton
Surface waters
Particles (particulate matter)
Sediment traps
Pumps
Sampling
food web
Particle size analysis
Silicon Dioxide
nitrogen
pump
diatom

Cite this

Puigcorbé, V., Benitez-Nelson, C. R., Masque, P., Verdeny, E., White, A. E., Popp, B. N., ... Lam, P. J. (2015). Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific. Global Biogeochemical Cycles, 29(8), 1309-1332. https://doi.org/10.1002/2015GB005134
Puigcorbé, V. ; Benitez-Nelson, C.R. ; Masque, Pere ; Verdeny, E. ; White, A.E. ; Popp, B.N. ; Prahl, F.G. ; Lam, P.J. / Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific. In: Global Biogeochemical Cycles. 2015 ; Vol. 29, No. 8. pp. 1309-1332.
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Puigcorbé, V, Benitez-Nelson, CR, Masque, P, Verdeny, E, White, AE, Popp, BN, Prahl, FG & Lam, PJ 2015, 'Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific' Global Biogeochemical Cycles, vol. 29, no. 8, pp. 1309-1332. https://doi.org/10.1002/2015GB005134

Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific. / Puigcorbé, V.; Benitez-Nelson, C.R.; Masque, Pere; Verdeny, E.; White, A.E.; Popp, B.N.; Prahl, F.G.; Lam, P.J.

In: Global Biogeochemical Cycles, Vol. 29, No. 8, 2015, p. 1309-1332.

Research output: Contribution to journalArticle

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T1 - Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific

AU - Puigcorbé, V.

AU - Benitez-Nelson, C.R.

AU - Masque, Pere

AU - Verdeny, E.

AU - White, A.E.

AU - Popp, B.N.

AU - Prahl, F.G.

AU - Lam, P.J.

PY - 2015

Y1 - 2015

N2 - ©2015. American Geophysical Union. All Rights Reserved. Summertime carbon, nitrogen, and biogenic silica export was examined using 234Th:238U disequilibria combined with free floating sediment traps and fine scale water column sampling with in situ pumps (ISP) within the Eastern Tropical North Pacific and the Gulf of California. Fine scale ISP sampling provides evidence that in this system, particulate carbon (PC) and particulate nitrogen (PN) concentrations were more rapidly attenuated relative to 234Th activities in small particles compared to large particles, converging to 1-5 μmol dpm-1 by 100 m. Comparison of elemental particle composition, coupled with particle size distribution analysis, suggests that small particles are major contributors to particle flux. While absolute PC and PN export rates were dependent on the method used to obtain the element/234Th ratio, regional trends were consistent across measurement techniques. The highest C fixation rates were associated with diatom-dominated surface waters. Yet, the highest export efficiencies occurred in picoplankton-dominated surface waters, where relative concentrations of diazotrophs were also elevated. Our results add to the increasing body of literature that picoplankton- and diazotroph-dominated food webs in subtropical regions can be characterized by enhanced export efficiencies relative to food webs dominated by larger phytoplankton, e.g., diatoms, in low productivity pico/nanoplankton-dominated regions, where small particles are major contributors to particle export. Findings from this region are compared globally and provide insights into the efficiency of downward particle transport of carbon and associated nutrients in a warmer ocean where picoplankton and diazotrophs may dominate. Therefore, we argue the necessity of collecting multiple particle sizes used to convert 234Th fluxes into carbon or other elemental fluxes, including

AB - ©2015. American Geophysical Union. All Rights Reserved. Summertime carbon, nitrogen, and biogenic silica export was examined using 234Th:238U disequilibria combined with free floating sediment traps and fine scale water column sampling with in situ pumps (ISP) within the Eastern Tropical North Pacific and the Gulf of California. Fine scale ISP sampling provides evidence that in this system, particulate carbon (PC) and particulate nitrogen (PN) concentrations were more rapidly attenuated relative to 234Th activities in small particles compared to large particles, converging to 1-5 μmol dpm-1 by 100 m. Comparison of elemental particle composition, coupled with particle size distribution analysis, suggests that small particles are major contributors to particle flux. While absolute PC and PN export rates were dependent on the method used to obtain the element/234Th ratio, regional trends were consistent across measurement techniques. The highest C fixation rates were associated with diatom-dominated surface waters. Yet, the highest export efficiencies occurred in picoplankton-dominated surface waters, where relative concentrations of diazotrophs were also elevated. Our results add to the increasing body of literature that picoplankton- and diazotroph-dominated food webs in subtropical regions can be characterized by enhanced export efficiencies relative to food webs dominated by larger phytoplankton, e.g., diatoms, in low productivity pico/nanoplankton-dominated regions, where small particles are major contributors to particle export. Findings from this region are compared globally and provide insights into the efficiency of downward particle transport of carbon and associated nutrients in a warmer ocean where picoplankton and diazotrophs may dominate. Therefore, we argue the necessity of collecting multiple particle sizes used to convert 234Th fluxes into carbon or other elemental fluxes, including

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DO - 10.1002/2015GB005134

M3 - Article

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JF - Global Biogeochemical Cycles

SN - 0886-6236

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