Export production of particles to the interior of the equatorial Pacific Ocean during the 1992 EqPac experiment

Honjo, Susumu; Dymond, Jack; Collier, Robert W.; Manganini, Steven J.

doi:10.1016/0967-0645(95)00034-n

Cited by 299 publications

(196 citation statements)

References 30 publications

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“…Although the broad pattern is similar to that found in sediment traps ( Figure 2c; Dymond and Lyle 1994;Honjo et al 1995;Honjo et al 2008), the abrupt increase from 1˚N to the equator is different and similar in magnitude to that of the Ψ--values. (Sager 2007), more modest movements within the precision of the paleomagnetic method (typically 2˚--3˚) are possible.…”

Section: Introductionsupporting

confidence: 77%

“…For example, the CCD evolution was estimated by Pälike et al (2012) The equatorial anomalies mostly lie within a degree of the equator predicted by recent kinematic models for the Pacific tectonic plate Wessel et al 2006;Wessel and Kroenke 2008). However, anomalies "F" (Dymond and Lyle, 1994;Honjo et al, 1995). Wessel et al (2006) and (short--dashed line) the Pacific plate relative to hotspots ("WK08--G") model of Wessel and Kroenke (2008).…”

Section: Equatorial Pacific Paleoceanographymentioning

confidence: 73%

“…As the high Ψ−values occur over only a limited range of latitude and appear centered on the equator Siddall et al 2008;Figure 3a), any physical movement of particles to the equator may be expected to have reinforced the effect of enhanced surface productivity. The geochemical proxies of surface productivity (Murray et al, 2000a(Murray et al, , 2000bPayton et al, 1996) also seem to be somewhat more sharply peaked at the equator than fluxes derived from sediment traps (Figure 2c; Dymond and Lyle, 1994;Honjo et al, 1995), potentially a result of some physical movement of particles.…”

Section: Introductionmentioning

confidence: 94%

“…Previous attempts at constraining Pacific plate motion using equatorial sediments have characterized the broad pattern of sediment accumulation associated with surface productivity (Mitchell 1998a;Moore et al 2004;Parés and Moore 2005;Suarez and Molnar 1980). However, though peaking at the equator, particle flux from sediment traps is broadly elevated across 10˚ of latitude ( Figure 2c; Dymond and Lyle;Honjo et al, 1995), so the productivity effect, if it were recorded straightforwardly in older sediments, may not necessarily provide an accurate measure of paleolatitude.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Cenozoic equatorial sediment deposition anomalies for potential paleoceanographic and Pacific plate motion applications

Mitchell

Dubois

2013

Mar Geophys Res

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If equatorial sediments form characteristic deposits around the equator, they may help to resolve the amount of northwards drift of the Pacific tectonic plate.Relevant to this issue, it has been shown that 230 Th has been accumulating on the equatorial seabed faster than its production from radioactive decay in the overlying water column during the Holocene (Marcantonio et al., 2001). Some researchers have argued that this reflects the deposition of particles with adsorbed 230 Th carried by bottom currents towards the equator ("focusing"). If correct, this effect may combine with high pelagic productivity, which is also centered on the equator, to yield a characteristic signature of high accumulation rates marking the paleoequator in older deposits.Here we evaluate potential evidence that such an equatorial feature existed in the geological past. Seismic reflection data from seven meridional transects suggest that a band of equatorially enhanced accumulation of

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Section: Introductionsupporting

confidence: 77%

Section: Equatorial Pacific Paleoceanographymentioning

confidence: 73%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Evaluating Cenozoic equatorial sediment deposition anomalies for potential paleoceanographic and Pacific plate motion applications

Mitchell

Dubois

2013

Mar Geophys Res

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“…To place these #uxes into a global context, the annual opal #ux at 633S is the largest ever measured (S. Honjo, personal communication), and greater than that measured in the highly productive Arabian Sea upwelling system (48 mg m\ d\ at 828 m; Honjo et al, 1999). Furthermore, the annual mass #ux in the PFZ (573S), despite being substantially less than the Antarctic Zone, is comparable to the largest annual #ux (95 mg m\ d\ ) measured during the US JGOGS study in the equatorial Paci"c Ocean (Honjo et al, 1995). The maximum #ux observed in all the sediment traps (220 mg m\ d\ ) was only slightly less than the maximum observed in the Arabian Sea (252 mg m\ d\ ; Honjo et al, 1999).…”

Section: Antarctic Circumpolar Currentmentioning

confidence: 68%

The US Southern Ocean Joint Global Ocean Flux Study: an introduction to AESOPS

Smith

Anderson

Moore

et al. 2000

Deep Sea Research Part II: Topical Studies in Oceanography

120

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The United States Southern Ocean Joint Global Ocean Flux Study (JGOFS), also known as AESOPS (Antarctic Environment and Southern Ocean Process Study), focused on two distinct regions. The "rst was the Ross-Sea continental shelf, where a series of six cruises collected a variety of data from October 1996 through February 1998. The second area was the southwest Paci"c sector of the Southern Ocean, spanning the Antarctic Circumpolar Current (ACC) at &1703W. Data were collected within this region during "ve cruises from September 1996 through March 1998, as well as during selected transits between New Zealand and the Ross Sea. The "rst results of these cruses are described in this issue. The Ross-Sea investigation extensively sampled the area along 76330 S to elucidate the temporal patterns and processes that contribute to making this one of the Antarctic's most productive seas. Hydrographic distributions con"rm that strati"cation is initiated early in October within the polynya, generating an environment that is favorable for phytoplankton growth. Signi"cant spatial variations in mixed-layer depths, the timing of the onset of strati"cation, and the strength of the strati"cation existed throughout the growing season. Nutrient concentrations re#ected phytoplankton uptake, and reached their seasonal minimal in early February. Chlorophyll concentrations were maximal in early January, whereas productivity was maximal in late November, which re#ects the temporal uncoupling between growth and biomass accumulation in the region. Independent estimates of biogenic export suggest that majority of the #ux occurred in late summer and was strongly uncoupled from phytoplankton growth. The ACC region exhibited seasonal changes that in some cases were greater than those observed in the Ross Sea.0967-0645/00/$ -see front matter 2000 Published by Elsevier Science Ltd. PII: S 0 9 6 7 -0 6 4 5 ( 0 0 ) 0 0 0 5 9 -X Sea ice covered much of the region south of the Polar Front in winter, and retreated rapidly in late spring and early summer. Mixed layers throughout the region shoaled in summer due to surface heating, while the addition of freshwater from melting sea ice enhanced strati"cation in the Seasonal Ice Zone, creating conditions favorable for phytoplankton growth. For example, silicic acid concentrations decreased from initial values as high as 65 to less than 2 M within approximately 100 km (from 65.7 to 64.83S). Fluorescence values, however, showed less than a two-fold variation over the same distance. The vertical #ux of carbon in the Polar Front area is substantial, and marked variations in the composition of exported material exited over the region. The results provide a means whereby the controls of phytoplankton growth and organic matter #ux and remineralization can be analyzed in great detail. Additional results of the AESOPS project are discussed.

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The multiple fates of sinking particles in the North Atlantic Ocean

Collins

Edwards

Thamatrakoln

et al. 2015

Global Biogeochemical Cycles

101

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The direct respiration of sinking organic matter by attached bacteria is often invoked as the dominant sink for settling particles in the mesopelagic ocean. However, other processes, such as enzymatic solubilization and mechanical disaggregation, also contribute to particle flux attenuation by transferring organic matter to the water column. Here we use observations from the North Atlantic Ocean, coupled to sensitivity analyses of a simple model, to assess the relative importance of particle-attached microbial respiration compared to the other processes that can degrade sinking particles. The observed carbon fluxes, bacterial production rates, and respiration by water column and particle-attached microbial communities each spanned more than an order of magnitude. Rates of substrate-specific respiration on sinking particle material ranged from 0.007 ± 0.003 to 0.173 ± 0.105 day À1. A comparison of these substrate-specific respiration rates with model results suggested sinking particle material was transferred to the water column by various biological and mechanical processes nearly 3.5 times as fast as it was directly respired. This finding, coupled with strong metabolic demand imposed by measurements of water column respiration (729.3 ± 266.0 mg C m À2 d À1, on average, over the 50 to 150 m depth interval), suggested a large fraction of the organic matter evolved from sinking particles ultimately met its fate through subsequent remineralization in the water column. At three sites, we also measured very low bacterial growth efficiencies and large discrepancies between depth-integrated mesopelagic respiration and carbon inputs.

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Export production of particles to the interior of the equatorial Pacific Ocean during the 1992 EqPac experiment

Cited by 299 publications

References 30 publications

Evaluating Cenozoic equatorial sediment deposition anomalies for potential paleoceanographic and Pacific plate motion applications

Evaluating Cenozoic equatorial sediment deposition anomalies for potential paleoceanographic and Pacific plate motion applications

The US Southern Ocean Joint Global Ocean Flux Study: an introduction to AESOPS

The multiple fates of sinking particles in the North Atlantic Ocean

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